JPH0416982B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention is an interface that allows a standard telephone to interface with a radio transceiver that is connected directly or indirectly to a local central office in an overall telephone network. The present invention relates to an interfacing system for telephones with radio transceivers that allows the telephone to interface with a mobile cell radio transceiver that is part of an existing cell radio system in a region.

BACKGROUND OF THE INVENTION Conventional telephone network systems typically require lines or cables to run from a local telephone company's central office to individual telephone locations, such as homes or offices. Telephone trunk lines installed at such locations may be connected to one or more individual telephones of the touch-tone or pulse-dial type, or to switching equipment capable of connecting to a PBX (private branch exchange) or other internal switching system network. . In this case, it is necessary to lay transmission lines over long distances outside of densely populated areas, which increases costs, and therefore a separate telephone network system is required in such areas.

An example of a separate telephone network system is a cell telephone system. This system allows communication between a telephone installed in a car and the telephone network. In this case, the system includes a mobile transceiver mounted on the vehicle and capable of wireless communication with one or more cell transceivers with fixed antennas of the 800MC. The cell transceiver is connected to a computerized central switch that can interface with central offices within the telephone network. Communication between the mobile transceiver and the cell transceiver occurs at high speed and digitally.

A transceiver installed in a car typically includes a transmitter, a receiver, and a logic circuit consisting of a computer, and the transceiver is housed in the trunk of the car and can be operated directly by the user installed inside the car. connected to the control head. The control head is typically provided to send dial-in codes to the transceiver and includes the touch pad, microphone, and speaker necessary to control the transceiver.
For example, when dialing in a telephone number, the user manually enters the telephone number, which is simultaneously displayed and stored in the transceiver's memory. The user visually checks whether the dialed number is correct or not, and if it is correct, by pressing the send button, a sending code is given to the transceiver and the number stored in the storage section is digitally sent to the transceiver. The dialed number is then transmitted as binary data that is ultimately entered into the central office.

PROBLEM SOLVED BY THE INVENTION The control head of a cellular transceiver such as that described above has a unique configuration that is completely different from the way a standard telephone is interfaced to a telephone company's telephone network. The input configuration required to control this transceiver and the transceiver output configuration provided to the control head cannot be readily applied to typical touch-tone or pulse-dial telephones. There was a problem.

SUMMARY OF THE INVENTION In accordance with the present invention, a system is provided for interfacing a general purpose telephone handset with a standard cellular radio transceiver. According to the interface system of the present invention, the telephone can be used by dialing or calling in the same manner as before. It is also adaptable to telephone handsets without redesigning standard radio transceivers such as those used in previous cellular radio systems.

Further, in the interface system of the present invention, a cell transceiver can be installed in a home or office, and there is no need to change the internal telephone network of the home or office. And home through wireless communication,
It enables calls to offices, eliminates the need for installing telephone lines, is economically advantageous, and can be configured to be used in sparsely populated areas similar to wireless telephone communications such as cell radio telephone systems.

The present invention is also a relatively small and compact unit that can be connected to standard telephones or indoor exchanges, and also to interface with so-called telephone trunks. This unit is configured as a standard radio transceiver, such as a cellular mobile radio, and is typically a trunk-mounted component. This unit includes a receiver, a transmitter, and a computer logic circuit, but does not include a wireless head section. This system includes a small
Use an antenna with 800MC gain. This antenna uses a small directional antenna for existing remote cell transmitting and receiving antennas. The system also includes a power supply capable of generating sufficient current at 12V DC to carry out the normal functions of the telephone handset. In case of power outage, preferably use a rechargeable 12V DC battery.

Additionally, a wireless transceiver is connected to a general purpose telephone via the interface system of the present invention.
The interface system includes circuitry that simulates the typical ring and dial tone signals of a telephone. When the handset is taken off-hook, a tone generator within the interface system rings and the electrodes for the tip are connected to generate a tone simulating a dial tone. If the dial is off-hook for a predetermined period of time or longer and there is no other dial input, the tone generator is turned on and off to generate a tone that simulates a reorder tone. Upon receiving an incoming call (i.e., receiving an alarm signal from the transceiver), the interface system provides a ringing signal to the telephone's ringing circuitry. This causes the telephone to continue ringing in the conventional manner until taken off-hook. When an off-hook condition occurs, the ringing circuit is turned off to stop ringing and connect to the transceiver.

The interface system of the present invention includes a device for converting digits entered by a touch tone or pulse dial into digital data that can be transmitted by a transceiver. Each time a digit is dialed, a touch tone or pulse dial signal is converted to digital data and stored in the transceiver. Once all digits have been dialed in, the interface system automatically determines when the last digit was entered and provides a transmit code signal to the transceiver. The transceiver responds to a transmit code signal, which corresponds to a manual pushbutton in a general purpose cellular radio system, by transmitting digital data that is ultimately decoded at the local central office to complete the call. Further, when the call is completed and the handset becomes on-hook, a termination signal is given to the transceiver, and the on-hook state can be notified.

(Function) According to the present invention, it is possible to provide an interface system that interfaces a standard telephone with a typical cell radio transceiver, and can be used as a general-purpose telephone without changing the transceiver or the existing cell phone network. In addition to providing a fully comparable standard cellular transceiver, existing wireless communication systems, such as cellular radiotelephone systems, can be used in conjunction with general purpose dial telephones.

According to the present invention, the numbers from the touch tone and pulse dial are converted into digital data and stored in the transceiver, and the time when the last number is dialed can be automatically determined, and a transmission signal can be sent to the transceiver for transmission for a predetermined period of time. A ring tone and a dial tone can be provided to the handset to operate the handset in a known manner.

(Effects of the Invention) According to the present invention configured as described above, by simply installing a general-purpose cellular wireless transceiver at the installation location of a general-purpose telephone, it is possible to make calls via the existing cell network, and it is possible to make calls via the existing cell network. The present invention achieves effects such as eliminating the cost of laying electric wires and significantly improving versatility as a whole.

Embodiment FIG. 1 shows a typical cell radio telephone network. A telephone company's telephone office 300 is connected to a nationwide switching network and to telephones in various locations including offices via business telephones. More specifically, a telephone company's central office 300 is interfaceably connected to a main cell switch 302, and each remote system 304 that is a cell transmitter/receiver is connected to the main cell switch 302.
It is connected to the telephone office 300 via an interface. Each remote system is 304 height 150-300
It includes an antenna mounted on a 45- to 90-foot (45- to 90-meter) tower to which communications are made with one or more transmitting and receiving devices.

A transceiver device for communicating with the remote system 304 is typically mounted in the trunk of an automobile 306 and includes a transmitter, a receiver, and a computer circuit (hereinafter simply referred to as transceiver 3), and the mobile transceiver 3 and the remote system 304 A wireless transmission path is formed between the main bodies. A portable cell phone 30 is used to communicate with the antenna of a remote system 304.
8 can also be used. In addition to the transceiver 3 mounted in the trunk, a control head (not shown) consisting of a custom keypad and display panel is placed inside the vehicle and connected to the transceiver via a cable.

The system 310 including the transceiver 3 also includes an interface section 314 through which a standard touch tone or pulse dial telephone 1 and the transceiver 3 are interfaced. In this case, the system 310 can be connected directly to the handset of the telephone 1 and can also be connected to a switch 31 installed in a typical office.
2 may be connected. In this system 310, the transceiver 3 and the interface section 3 are actually connected to each other.
14 are connected via a so-called input connection line.
The transceiver 3 is also connected to an antenna 316, such as a small directional antenna with a gain of 800mc. The use of a directional antenna 316 for the closest remote system 304 provides higher gain compared to omnidirectional antennas typically used in vehicle-mounted transceivers.

FIG. 2 shows an overall wiring diagram of an interface section 314 for connecting a standard touch tone or pulse dial type telephone 1 and a transceiver 3. As shown in FIG. According to a preferred embodiment, transceiver 3 uses a standard transceiver such as a NEC TR5E 800-2B. By using such a transceiver 3, communication is possible even when the system 310 moves within a wireless network, as explained at the beginning. In addition, a cell type transceiver can also be used, and the interface section can be changed as appropriate depending on the characteristics of the transceiver 3. Therefore, the configuration of the present invention can also be applied to a non-cell communication system in which a master station and a slave station can communicate wirelessly. For example, the transceiver can be configured as part of a compander system well known to those skilled in the art. That is, any transceiver that is controlled by an input, such as a transmit signal, similar to a cellular transceiver, and that provides an output, such as an alarm signal, similar to the output provided by the cellular transceiver as described above, may be used. The transceiver 3 is the same as that normally installed in a motor vehicle, but does not include a control head mounted in the passenger compartment of the motor vehicle.

As described above, the telephone 1 and the transceiver 3 are connected via the interface section 314, and the interface 314 includes an interface board 5 made of a printed wiring board and a ring power supply board 7, as shown in FIG. and an adapter board 9. In this case, the interface section 314
was configured as a separate printed wiring board, but
It will be obvious to those skilled in the art that the board can be configured into a single board that combines the functions of each board, or it can be divided into a larger number of boards depending on the purpose of use. 3A to 3D show the interface board 5, FIG. 4 shows the ring power supply board 7, and FIG. 5 shows the adapter board 9.

Referring to Figures 3A-3D, a telephone having ring terminals and chip terminals is connected to terminals 1 and 2 of terminal block J1 of the interface board. When the handset of the telephone is removed, a loop current flows and the current detection relay 11 is energized. The normally open contacts of reloo 11 are connected to a standard touchtone rotary dial decoder converter circuit 13. Decoder converter circuit 13
A Teletone M-948DTMF receiver may be used, although other suitable decoder and converter circuits may also be used. More specifically, the relay 11 is connected to a pin of the decoder/converter circuit 13 (ie, to which the pulse dial signal is input). This input signal is applied to buffer 15 approximately 200 milliseconds later and is used to indicate an off-hook condition. The output of the buffer 15 causes the transistor 17 to
When turned on, relay 19 is energized and the telephone is connected to buffer 25 via modulation chains 21 and 23. The output of buffer 25 is sent to the SIG IN bin of decoder/converter circuit 13 as a tone dial signal. Further, when the transistor 17 is turned on, the base of the transistor 27 is set to a low level, and the transistor 27 is turned on. This causes the IGN terminal of terminal block J1 to
It is set to 12 volts and an outgoing call is made.

The buffer 15 is also connected to a NAND circuit 29,
The output of NAND circuit 29 is sent to one input terminal of latch circuit 31 (see Figure 3D). The latch circuit 31 includes NOR circuits 31A and 31B. When the telephone handset is hung,
The latch circuit 31 is reset by the NAND circuit 29 (inverter), and the output of the latch circuit 31 is at a low level. Next, when the handset is disconnected, the output of the NAND circuit 29 becomes low level, this low level signal is sent to the input terminal of the NOR circuit 33, and the output of the NOR circuit 33 is made high level. An inverter 35 is connected to the output terminal of the NOR circuit 33, and this inverter 35
output becomes low level. The output of inverter 35 is sent to a series of NOR circuits 37. Another input terminal of gate 37A is connected to alarm latch circuit 157, which will be described below. At this point, it is assumed that the signal from latch circuit 157 to gate 37A is at a low level. Therefore, if the two inputs of gate 37A are both at low level, the output of gate 37B becomes high via gate 37E, turning on transistor 41 (see FIG. 3B). The output of gate 37B remains high until a timer consisting of counter 59 and decimal decoder (or converter) 39 counts 15 seconds.

When transistor 41 is turned on, a ground circuit for dial tone generator 43 is formed. Dial tone generator 43 includes 350 Hz and 440 Hz sine wave generators 43A and 43B, each output of which is sent to amplifier 45 at the input of hybrid circuit 95. The dial tone is sent from amplifier 45 through buffer 47 as an operational amplifier to terminals A, A, and from terminals A, A to the receiving telephone via tip and ring contacts.

As mentioned above, dialing may be done by touch tone or rotary dialing, depending on the standard handset used. In either method, the dialed telephone number is decoded by the decoder/converter circuit 13. That is, the dialed number is converted to an output in binary coded decimal system, and the output terminals D3, D2,
Given to D1 and D0. For purposes of illustration, only tone dials will be discussed below, but those skilled in the art will understand that pulse dials are also decoded by decoder/converter circuit 13.

When the touchtone button on the handset is pressed,
Decoder/converter circuit 1 via buffer 25
The tone is sent to the SIG IN input terminal of 3. At this time, the output at the DV output terminal of the decoder/converter circuit 13 becomes high level when dialing (that is, when the button on the handset is pressed). The output of the DV terminal is sent to the NAND circuit 51 via the buffer 49.
The NAND circuit 51 itself is further connected to a NAND circuit 53. Outputs from the counters 59 and 39 are input to another input terminal of the NAND circuit 51. The outputs from the timers input to the NAND circuit 51 will be explained below, but the timers 59 and 39
is maintained at a high level until counting 15 seconds.

The output of the NAND circuit 53 is sent to the gate 31B of the input section of the latch circuit 31. NAND circuit 5
The latch circuit 31 is set when the three outputs are at a high level. This high level output is generated as soon as a key on the telephone is pressed and dialing begins. When the latch circuit 31 is set, NOR
Transistor 41 is turned off via circuit 37 and dial tone generator 43 is turned off. Therefore, when dialing is initiated, dial tone generator 43 will be turned off.

In this configuration, if the off-hook state continues for a predetermined period of time, a reorder tone is generated.
The multivibrator 55 (see FIG. 3D) has a period of one second, and the inverter buffer circuit 5
7 to a timer 59 which is a binary counter. The output terminal of the timer 59 is connected to the timer 39 which is a decimal counter, but the reset terminal of the timer 59 is connected to the output terminal of the OR circuit 61, and the output terminal of the OR circuit 61 is connected to a NAND circuit indicating off-hook. Output from 29, via the DV pin of the decoder/converter circuit 13 to the NAND circuit 5
3, as well as the output of a transmitting flip-flop circuit 63 (described below). The timer 59 continuously counts until it is reset by one of the three inputs of the OR circuit 61. If timers 39 and 59 count 15 seconds and during that time the handset is removed and no dialing is done,
Since the input to the NAND circuit 51 becomes low level and the output becomes high level, the state of the NAND circuit 53 changes. Further, the low level output of the timer 39 is applied to the EN input terminal of the timer 59, and the operation of the timer 59 is stopped. Furthermore, timer 39
The 15 second output of is input to gates 37C and 37D. When the output of gate 37C is output through gate 37B, dial tone generator 43 is disabled. On the other hand, the transistor 41 is switched at one second intervals by the output of the gate 37D. As a result, a dial tone is generated from the dial tone generator 43 at one second intervals, and the dial tone is generated from the amplifier 4.
5 and terminals A and A to the telephone set.
This recorder tone is generated continuously until the telephone is hung and dialed again.

To summarize the dialing function here, each number is input using the handset of the telephone, and the corresponding tone is sent to the decoder/converter circuit 13.
When applied to the SIG IN input terminal, the tone is BCD
It is decoded into a (binary coded decimal system) signal and applied to output terminals D0, D1, D2, D3, and further sent to a three-state buffer 67 via a buffer 65. When each number is dialed in, the output of the NAND circuit 51 is set to low level, and the information is transferred from the decoder/converter circuit 13 to the terminal block J3 (see FIG. 3B) via the buffer 67 and the data line. The data is sent to the adapter board 9 shown in the figure. Simultaneously, dial input is performed and NAND
When the output of circuit 53 becomes a high level output, this high level output is applied to OR circuit 69 to generate a positive data storage pulse, and capacitor 71
and is sent to terminals J3 and 11 of terminal block J3 via OR circuit 73. This data storage pulse is provided to the adapter board 9, which will be described in detail below.
Now, the numbers from each dial input are given to the shift register 75 of the adapter board 9, and this number data is converted to serial data and sent to the data line 77.
and is finally sent to the transceiver via terminal 5 of terminal block J2. This serial data representing the dialed number is stored in the transceiver so that it can eventually be transmitted when a transmit signal is provided.

In separating each number given to the transceiver 3, a predetermined code called the All Keys Release (AKR) signal is used. That is, when the phone button is released, the DV of the decoder converter circuit 13
The output at the terminal goes to low level, so
The output of the NAND circuit 53 becomes low level (at the same time, the output of the NAND circuit 51 becomes high level, making the buffer 67 unusable and stopping the number data from the data line). A negative pulse is therefore generated on capacitor 71 and one shot trigger circuit 79 is triggered. Along with this, one
A 200 millisecond pulse is generated from the Q output terminal of shot trigger circuit 79. At the same time, the output of the terminal becomes low, the three-state buffer 81 is enabled, and the stored predetermined code of the AKR signal is sent to the data line. The 200 millisecond pulse at the Q output terminal of one shot trigger circuit 79 is sent to OR circuit 73 via capacitor 83.
Positive data storage (DS) at the start of AKR code transmission
A pulse is given.

After a predetermined number of digits has been dialed in (this predetermined number is automatically determined in a manner detailed below), a transmit code signal is ultimately sent to the transceiver 3 via the data line. It is necessary to instruct the transceiver 3 in a known manner to transmit the dialed number, ie the number stored in the memory. In known mobile cell radio systems, a transmit code is manually generated by a system user by dialing a predetermined number of numbers, visually confirming that the number is a predetermined number, and then by the user pressing a transmit button. Therefore, some telephones have a configuration in which the transceiver 3 senses this and sends out the information, but since standard telephones do not have such a transmit button, the determination when a transmit code occurs is determined by a logic circuit as explained below. This is done using

That is, the transmission code is transmitted in the following manner.
When a number is dialed in, the DV-AKR latch circuit 85 is set by the output of the NAND circuit 53. The output of the latch circuit 86 switches to a low level, and this low level output is caused by the trailing edge of the AKR one shot pulse to cause the latch circuit 85 to switch to a low level.
Maintained until CK input signal is clocked
After the AKR pulse, when the latch circuit 85 is reset, the output of the latch circuit 85 becomes high level. This high level output is sent to one input terminal of the NAND circuit 87.

When the last digit is dialed in, the input to inverter 90 goes low in the manner described below. As a result, the output of the inverter 90 becomes high level and is sent to the second input terminal of the NAND circuit 87. After transmitting AKR, the output of the NAND circuit 87 becomes low. Therefore, after all digits have been entered on the dial and the last AKR pulse has been triggered, the output of the NAND circuit 87 goes low.

The output of the NAND circuit 87 is given to the gate circuit 89, so the output of the gate circuit 89 becomes high level, and the one-shot trigger circuit 91 for delay
is triggered. After 200 milliseconds, the Q output of the one shot trigger circuit 91 becomes high level, and the one shot trigger circuit 93 for transmission is triggered by the trailing edge of the one shot pulse. The output of one-shot trigger circuit 93 enables hybrid circuit 95 to be used as a three-state buffer with a predetermined transmit code internally encoded. When hybrid circuit 95 is triggered by one-shot trigger circuit 93, a predetermined transmit code is sent onto the data line. At the same time, the Q output of the one shot trigger circuit 93 is input to the OR circuit 69.
A positive data storage pulse is created through capacitor 71 and OR circuit 73 and applied to pin 11 of terminal block J3 through the data storage (DS) line. This DS pulse is sent to the adapter board 9. The trailing edge of the Q output of the one shot trigger circuit 93 triggers the AKR one shot trigger circuit 79 and applies the AKR code to the data line as described above. Similarly, the data storage pulse is
Sent via capacitor 83 at the beginning of the AKR one shot cycle.

It will be appreciated that after each piece of information is transmitted, the AKR code is applied to the data line and finally sent to the transceiver 3. That is, each digit is transmitted after the transmission code is transmitted. For this reason, each piece of numerical information is separated, and the transceiver 3 identifies this numerical information. This AKR code is of course AKR
It cannot be used in a transceiver 3 that does not include the function. For example, the General Electric (GE) transceiver called GE STAR does not need to transmit an AKR code signal between each digit or information transmitted; in this GE system, a strobe pulse separates each digit information. Used as a marker.

When the AKR code is applied after the transmit code has been sent out, the transceiver 3 completes its connection. That is, as is well known to those skilled in the art, the telephone number information is transmitted digitally at high speed by the transceiver 3, and is ultimately input into the office switchboard, connected to the telephone network, and the desired person skilled in the art is called. When this call is completed, the telephone set and transceiver 3 are audibly connected via the 2-4 wire hybrid circuit. This results in full duplex communication operation. That is, the audio input from transceiver 3 is connected to terminal block J.
2 and line 8, while the audio output is provided to transceiver 3 via pin 2 of terminal block J2. It will be appreciated that cellular transceivers, as is known, have separate audio input and output channels. For example, in known telephones, voice input and voice output occur via a single channel. Therefore, the hybrid circuit 95 converts the two-channel, four-wire connection to the transceiver 3 into a single channel, two-wire connection, and connects it to the handset of the telephone set.

The audio channel from transceiver 3 to interface section 314 is connected to pin 8 of terminal block J2.
1 through a two-wire connection, while the audio channel from interface section 314 to transceiver 3 is formed through a two-wire connection from pins 1 and 2 of terminal block J2. Audio from the transceiver 3 is provided via an amplifier 45, a bridge circuit 209, and a buffer 47 as an operational amplifier.
More specifically, the audio is routed through amplifier 47A, and the output of amplifier 47A is routed to the input terminal of amplifier 47B. A feedback circuit formed from amplifier 47B via resistor 211 is further connected to terminals A, A via transformer 213 and tip and ring contacts at terminals 1, 2 of terminal block J1.

The audio channel from the telephone is connected to terminal block J.
from the chip and ring terminals at terminals 1, 2 of 1 through terminals A, A and transformer 213 to the input terminal of amplifier 47B. amplifier 4
The output of 7B is sent to the input terminal of amplifier 47A,
The output of amplifier 47A is sent to the input terminal of amplifier 215 via a feedback circuit. Amplifier 21
The audio output of 5 is provided to transceiver 3 via pin 2 of terminal block J2.

When the call is completed and the handset of the telephone is hung up (on-hook state), an end code is sent to the transceiver 3 via the data line to notify the end of the call. More specifically, first, the off-hook terminal of the decoder/converter circuit 13 is set to low level, and the output of the NAND circuit 29 is set to high level via the buffer 15. The high level output of the NAND circuit 29 is applied to the input terminal of the termination one shot trigger circuit 97 to generate a 200 millisecond pulse. The output of one-shot trigger circuit 97 enables three-state buffer 99 and provides a predetermined end code signal to the data line. The Q output of the one shot trigger circuit 97 is connected to the OR circuit 69.
is applied to generate a positive pulse, which is sent to the data line via capacitor 71 as a data storage pulse. When the transmission of the termination one shot pulse ends, the trailing edge of this pulse triggers the AKR one shot trigger circuit 97 to generate the AKR code and send it to the data line as described above.

It will be appreciated that the telephone handset is off-hook while the telephone number is being dialed, ie, prior to generation of the transmission code. Therefore, some means for inhibiting audio input from the transceiver 3 is required. It is also necessary to take measures to prohibit the reorder tone after the transmission code is generated. This can be achieved as follows. That is, when the one-shot trigger circuit 93 for transmission is triggered and a transmission code is applied to the data line, the flip-flop circuit 63 for transmission is set. More specifically, the Q output of the one-shot trigger circuit 93 is input to the flip-flop circuit 63. Meanwhile, flip-flop 63 is reset by a pulse from capacitor 101 connected to buffer 15. Therefore, flip-flop 63 is reset when an off-hook pulse is input, and is set when one-shot trigger circuit 93 is activated. When the flip-flop circuit 63 is set by the one shot trigger circuit 93, the Q output of the flip-flop 63 is input to the OR circuit 61,
This resets the timer 59 (3rd D
(see figure). timer 59 is held in a reset state;
Timer operation after connection with transceiver 3 is prevented and no reorder tone is generated. Before flip-flop 63 is set, the output of flip-flop 63 is at a high level, and OR circuit 103
(3rd B) is applied to the transistor 105 via
(see figure). This turns on transistor 105, grounds the pair of resistors 107, and inhibits transmission from pin 8 of terminal block J2 to hybrid circuit 95. The audio channel from the transceiver 3 is therefore kept inactive at least until the transmission code occurs.

Additionally, the audio on the receiver will be turned off after 200 milliseconds after pressing a key on the phone. This is achieved by sending the output of NAND circuit 53 to one-shot trigger circuit 109 and OR circuit 103. Thus, when a key is pressed, audio output is stopped for at least 200 milliseconds. The voice stop function using this key is required when pressing a key on the telephone after the voice is connected to the transceiver 3. The tone generation signal is often used as a code for bank computers and the like. Transceiver 3
can detect the digits and regenerate and transmit the tone after the transmit code has been sent. The regeneration of such tones is provided to the "hearing" via the connected audio channel.

Next, a method for automatically determining by the interface section 314 to provide the transmission code to the transceiver 3 via the data line will be described.
That is, a configuration for determining a predetermined number of digits of a telephone number dialed by the system section 310 will be explained.

According to this system unit 310, when the last digit of a telephone number is dialed in, that is, when a transmission code is sent to the data line, the first digit of the telephone number is determined, and for example, the first digit is 0 or 1. If there is, the dial input time is determined, and a logical analysis is performed based on this information. In order to construct a logic circuit that makes appropriate decisions, it is necessary to design a system that detects the various combinations of 1's and 0's commonly used in telephone networks. In this embodiment, the following logic circuit is configured for the telephone system.

The first number is 0 and the specified time (for example, 3 seconds)
If there is no dialing within, an operator call is made and a transmit code is initiated. When the first digit is 0 or 1, followed by 3 digits, and the next 2 digits after 3 consecutive digits are 1, or when 3 digits are dialed in and the last two digits are both 1. , an emergency call is made, and then a transmit code is initiated. If a 1 or 0 is dialed first, a call is made, such as a long distance call with an operator, such as a credit card call. In this case, you can enter a number of 7 or more digits before sending the transmission code. First, 1 or 0 is dialed in, and if the third digit is 1 or 0, it is determined that the call is a long distance call outside the designated area, and a total of seven digits can be entered before sending the transmission code. On the other hand, when making an international call,
011 is added. In this case, the send code is generated three seconds after a number has been dialed. Since a predetermined number of digits cannot be used in international calls, it is necessary to improve the accuracy of timing operations.

The above has been explained using the US telephone network as an example. What is necessary is that according to the present invention, it is determined whether each of the above conditions is satisfied, and when the conditions are satisfied, a low level signal is input to the inverter 90. and the sending code is started. The logic circuit is appropriately designed depending on the telephone network used. In this embodiment, the determination of the start of the transmit code is made by a series of hard-wired gate circuits and flip-flops, which will be described below. Those skilled in the art will appreciate that microprocessor-based systems that make logic decisions in software can also be used.

The above decision is made as follows. When a key on the telephone is pressed and then released, the output of the NAND circuit 53 transitions from high level to low level. The shifted low level output is input from the NAND circuit 53 to the enable pin of the counter 111 (see FIG. 3C). The count value of the counter 111 is incremented each time each key is released, and the four-wire output of the counter 111 is input to a converter (or decoder) 113 that converts from binary to decimal. Converter 113 generates an output individually each time counter 111 increments. counter 111
Each time a digit is dialed in, the count value of counter 111 is incremented unless it is disabled or reset in the following manner.

Another converter 115 is provided to receive the four inputs from buffer 65. converter 115
decodes the output of buffer 65 and outputs the decimal digit of each digit input by dialing.

The outputs of converters 113, 115 are provided to a series of gate circuits 117A-117E. NOR
A gate circuit 117A consisting of a circuit converts the first digit minus the first digit (this corresponds to the output at terminal 0 of converter 113 since the count value is incremented for each key release) and the output at terminal 1 of converter 115. input. The gate circuit 117A generates a high level output only when the first digit input by dial is 1. Similarly, the other gate circuits 117B to 117E operate as follows. The first digit of gate circuit 117B is 0.
If so, the high level output is sent to the gate circuit 117.
Gate circuit 117 C outputs a high level if the second digit is 1, and gate circuit 117D outputs a high level if the third digit is 1.
E generates a high level output if the second digit is 0.

When the first dial input digit is 0, the output of gate circuit 117B becomes high level and latch circuit 119 is set. Latch circuit 11
A low level output is generated from 9 and the NOR circuit 1
21. The output from the timer 39, ie, the output from the terminal 3, is input to the other input terminal of the NOR circuit 121. Therefore, after the key is pressed, if the timer 39 counts for 3 seconds,
gives a low level output to the NOR circuit 121.
Since the NOR circuit 121 has two inputs at low level,
A high level output is generated and input to the NOR circuit 123. Therefore, the output of the NOR circuit becomes a low level and is input to the inverter 90, which triggers the one-shot trigger circuit 91 and further triggers the one-shot trigger circuit 93 as well. In this way, a transmission code is applied to the data line.

The first digit you dial is 1 or 0
(represented by the high level output of the gate circuit 117A or 117B), the counter 1
11 is not incremented and converter 113 is not incremented since counter 111 has been reset. That is, when high level outputs from the gate circuits 117A and 117B are given to the NOR circuit 125,
The latch circuit 127 is set and its Q output becomes high level, and this high level output becomes the gate circuit 1.
29, 131, and the counter 111 is reset. Therefore, the first digit is not counted. For example, number (0-911) or (1
-191) is dialed, converter 113
The output of and 115 will be the same as a number without a leading 0 or 1 (911).

Second digit number (converter 113, 115
) is 1 or 0, the leading 1 or 0 is ignored as described above, and the gate circuit 117
One of the outputs of C or 117E becomes high level. This output is given to an OR circuit 133, and a latch circuit 135 is set by the output of the OR circuit 133. The Q output of latch circuit 135 is applied to NOR circuit 138. When the second digit is 1, the output of the gate circuit 117C becomes high level,
The latch circuit 197 is set and its output is
It is input to the NOR circuit 139. NOR circuit 139
The output of is input to the NOR circuit 123.

Similarly, if the third digit is 1, the gate circuit 11
The output of 7D becomes high level and the latch circuit 141
is set, so its output becomes low level. The output of latch circuit 141 is NOR circuit 1
39. Therefore, when the second and third digits are both 1, the latch circuits 197 and 141
The output goes low when the key is released after the third digit. That is, terminal 4 of converter 113 is set to low level, NOR circuit 139 is set to high level, and NOR circuit 123 is set to low level, and a transmission code is generated as described above.

When a transmit code is not generated after the third digit, the count number of converter 113 increments continuously until a count of seven is reached. When the count reaches 7, the output of pin 8 of converter 113 becomes low level, and this low level output becomes NOR.
input to circuit 138. The Q output of the latch circuit 135 is input to the other input terminal of the NOR circuit 138 as described above. Therefore, the latch circuit 13
When 5 is not set even if a 1 or 0 is detected in the second digit (representing the area code), the output of latch circuit 135 goes high. This high level output is input to a NOR circuit 142, and the NOR circuit 141 itself is connected to a gate circuit 143. When the output of the NOR circuit 138 becomes high level, the output of the latch circuit 141 becomes low level and is input to the gate circuit 143. Gate circuit 14
A low level signal is input to the other input terminal 3 unless (011) (international code) is dialed in. Therefore, the output of the gate circuit 143 becomes high level, a SEND code is generated, and the NOR circuit 123
sent via.

On the other hand, the latch circuit 135 sets the second digit to 1 or 0.
is detected and set, the converter 113
The count is incremented until the count reaches 10. Therefore, the output of the terminal 10 of the converter 113 becomes low level and is input to the gate circuit 145. In this case, the latch circuit 197 prohibits generation of a transmission code in the seventh digit. Therefore, the output of the gate circuit 145 becomes high level, and the output of the NOR circuit 142 becomes low level.
As long as (011) is not dialed in, the output of the gate circuit 143 will be at a high level, and the NOR circuit 1
The output of 23 becomes low level and a transmission code is sent. This handles out-of-area long distance calls.

Now, for international calls, (011) is placed at the beginning.
(011) is counted by a counter 147 that receives input from gate circuits 149 and 151. Counter 147 counts the number of times counter 111 is reset by detecting a 1 or 0 in the first digit to be counted. It is reset three times and when the count number of the counter 147 reaches 3,
The high level output is given to the third terminal of the counter 147, while the high level output of the counter 147 is given to the gate circuits 153, 143. When a high level signal is input to the gate circuit 143, generation of a transmission code at the count number of the seventh or tenth digit is prohibited. When a high level signal is input to the gate circuit 153, the gate circuit 153
The output becomes low level. The low level output of the gate circuit 153 is input to the gate circuit 155,
A timer 39 is connected to the other input terminal of the gate circuit 155.
The second output of terminal 3 of is input. Therefore, if 3 seconds have passed since (011) was dialed and there is no further dialing, the gate circuit 155
The output becomes high level and is input to the NOR circuit 123. As a result, the output of the NOR circuit 123 becomes low level, and a transmission code is generated as described above.

Furthermore, a configuration in which the system is activated and receives an incoming call will be described. Some well-known transceivers used in cell radios generate signals such as alarm signals for incoming calls. In the present invention, an interface system is used to convert an incoming alarm signal and provide a ringing signal to a telephone handset.

More specifically, when the handset of the telephone is in an off-hook state, the current sensing relay 11 is opened to the input terminal of the decoder/converter circuit 13. Therefore, the off-hook output to buffer 15 becomes low level, so transistor 17 is not turned on and relay 19 remains open. Therefore, when the telephone is being ringed in the manner described below, the ringing voltage is
It is disconnected from the SIG IN input terminal of the converter circuit 13. Since transistor 17 is not turned on (ie, the collector of transistor 17 is at a high level), transistor 27 is not conducting and the IGN terminal of terminal block J1 of transceiver 3 is at 12V.
disconnected from power supply. For this reason, an alarm signal is emitted from the transceiver 3.

The alarm line connected to terminal 6 of terminal block J1 is connected to alarm latch circuit 157 via buffer 159 and inverter 161. One shot trigger circuit 93 while the phone is in use
The latch circuit 157 is reset (by the gate circuit 157A) by the output from the gate circuit 157A. Therefore, a high level output is generated from the gate circuit 157B.
The output of latch circuit 157 is sent to gate circuit 163. The output of gate circuit 163 is sent to call control terminal 4 of terminal block J1. Terminal 4 is connected to the calling power supply circuit as described above. When the latch circuit 157 is reset by the one-shot trigger circuit 93, the output of the gate circuit 163 becomes low level. Alarm terminal 3 of terminal block J1
The input signal is grounded (ie, set to low level) via the line, and this low level signal is sent to the inverter 161 via the buffer circuit 159, and the inverter 161 generates a high level output. The latch circuit 157 is set by this output, and the low level output of the latch circuit 157 is set by the gate circuit 16.
3 is input. The other input terminal of gate circuit 163 is low since the phone is on-hook and there is no loop current. That is, the contacts of the relay 11 are open, and the line connected to the input terminal of the buffer circuit 165 is at a high level because the decoder/converter circuit 13 is in a stopped state. Therefore, gate circuits 167, 169, 17
The input of the gate circuit 163 sent via 1 is at a low level. Therefore, the output of the gate circuit 163 is at a high level, and the output from the terminal 4 of the terminal block J1 is high.
sent to.

When the output of the gate circuit 163 (ie, the call control line) is at a high level, the 20 Hz multivibrator 173 generates a 20 Hz rectangular wave at its output terminal 175. Two JK flip-flops 177 are operated by a multivibrator 55 and an inverter buffer circuit 57, which function as a one-second clock.
are driven to generate rectangular waves of 2 seconds and 4 seconds, respectively. These rectangular waves are added via an OR circuit 179 to create a rectangular wave that is on level for 1 second and off level for 3 seconds, and is applied to the NAND circuit 181. Next, the output of the NAND circuit 181 is a 20Hz rectangular wave with an on level for 1 second and an off level for 3 seconds. This rectangular wave is inverted by an inverter 183, and transistors 185 and 187 are driven.
The application of a DC voltage of 150V is turned on and off and applied to a resistor 189 of 2200Ω. This 150V DC is supplied to the ring power supply board 7 shown in FIG. 4 through the terminal 7 of the terminal block J1. Referring to FIG. 4, it will be appreciated that the 150V is supplied via a transformer connected to the 12V power supply of the ring power supply board 7. The 12V DC is preferably obtained by an AC/DC converter that converts 120V AC to 12V DC. Additionally, a 12V DC backup power supply can be provided to ensure operating voltage even in the event of a power outage. The DC voltage of 150V is obtained by inputting the call control output signal of the gate circuit 163 to the terminal 4 of the terminal block J1 in FIG.
By turning on the converter circuit 195 having a transistor configuration for converting the voltage to 150V, the voltage is applied to the terminal 7 of the terminal block J1.

The output from the collector of transistor 187 is sent to the telephone circuit via capacitor 197, and a 15 VAC, 20 Hz calling signal is given to the telephone to ring the telephone. That is, the output from the collector of transistor 187 is applied to modulation yoke 21, relay 11, and modulation yoke 23 via capacitor 197, the call of terminal block J1, and chip terminals 1 and 2.

When a predetermined telephone is called, when the handset is removed and the handset is placed on-hook, the relay 11 is closed and the terminal of the decoder/converter circuit 13 is grounded. The grounded low level signal is input to the buffer 165, and the high level output of the buffer 165 is input to the gate circuits 167, 169, 171.
Since the output of the gate circuit 163, that is, the call control line, becomes low level (because of the buffer circuits 167, 169 and the capacitor 197, the relay 1 due to the call current
1 prevents call control from being lost during an on-hook state during a telephone call). When the call control signal is at a high level, when the off-hook occurs, both inputs of the gate circuit 199 (FIG. 3A) become high level, and the output of the gate circuit 199 becomes low level. This low level pulse is input to the gate circuit 89, and the output of the gate circuit 89 becomes high level. Therefore, the one-shot trigger circuit 91 is triggered, and the one-shot trigger circuit 93 is further triggered, and then as described above,
The AKR one shot trigger circuit 79 is triggered. Therefore, the transmission code signal is applied to the data line and transceiver 3, and the connection between the transceiver and the central office is completed. At the same time, one-shot trigger circuit 93 is triggered and latch circuit 157 is reset as described at the beginning. Therefore, when the handset of the telephone is removed while the telephone is ringing, the ringing is stopped and the transmission code is given to the transceiver 3, allowing the telephone office 300 and the transceiver 3 to communicate.

When the ring is completed and the phone is hung up (on-hook state), an exit code is sent and then the AKR
The code is provided to the transceiver 3 in the manner described above.

If the telephone is not answered during a ring, the ring continues until the caller hangs up. The ringing stops when the caller hangs up the handset.

More specifically, known cellular transceivers draw approximately 3A when a call is received (an alarm signal is generated). When the caller hangs up the handset, the current flowing through the transceiver 3 drops to about 1A. This current difference is detected and used for telephone call control. The current flowing through the transceiver 3 is applied to the power supply board (see FIG. 4) via the terminal 2 of the terminal block P105. The current is sensed by a 0.03Ω resistor 201 and the output is provided to terminal 5 of terminal block J1. This detection current is input to a DC amplifier 203 (see FIG. 3D), and the output of the amplifier 203 is applied to one input terminal of a comparator 205. Amplifier 203
The amplified voltage is applied to a comparator 205, which generates a high level output for low currents and a low level output for high currents. When the current decreases from a high level to a low level, capacitor 20
7 generates a positive pulse and the latch circuit 157
is reset.

Referring now to the circuit of adapter board 9 in FIG. 5, parallel digit data representing the digits of the dial input is input to shift register 75 via data lines D0-D3. This data is transferred serially from shift register 75 via data line 77 and temporarily stored in the transceiver until a transmit code is received as described above.

More specifically, the data on the data lines D0 to D3 are applied to terminals E, D, C, and B of the shift register 75. Inputs to terminals G, H, A, and F are given at a predetermined combination of high and low levels, as shown in FIG. These eight inputs are sent out via data line 77.

The data storage (DS) pulse is connected to terminal block P3.
When the data storage line goes high, that is, when the data storage line goes high, the latch circuit 22 is reset by the high level pulse. Latch circuit 2
The Q output of 20 becomes low level and is given to the S/L terminal of the shift register 75.
5 loads data from data lines D0 to D3. The negative edge of the Q output is provided to the input terminal of delay circuit 222. The delay circuit 222 is composed of two one-shot trigger circuits connected in series. The OUT terminal of the delay circuit 222 becomes a high level 1 millisecond after the Q output of the latch circuit 220 becomes a low level, and remains at a high level for 1 millisecond. The latch circuit 224 is reset by the high level output from the OUT terminal of the delay circuit 222, and its Q output becomes low level, so that the directional control line (DCL) 226 becomes low level. Further, the low level Q output of the latch circuit 224 invalidates the reset (RES) of the counter 228.

In addition, the low level output of the DCL line causes the gate circuit 230 (second
(see Figure B) is enabled. Therefore, a serial data circuit is formed from the shift register 75 to the data line of the transceiver 3 (terminal 5 of terminal block J2).

While the DCL line 226 is low, the transceiver (not shown) responds to clock pulses on the HSCK line (this is a normal operating characteristic of the NEC transceiver). That is, the clock pulse from transceiver 3 is applied to terminal 6 of terminal block J2.
(see FIG. 3B) to terminal 15 of terminal block J3 and terminal 15 of terminal block P3. Similarly, the HSCK pulse is sent to the inverter 232.
(see FIG. 3B) and its inverted pulse is applied to terminal 6 of terminal block J3 and then to terminal 6 of terminal block P3 (see FIG. 5). When these pulses are applied, the CK terminal of shift register 75 is clocked and latch circuit 220 is set. The Q output of the latch circuit 220 becomes high level and is applied to the S/L terminal of the shift register 75, and data is transferred from the shift register 75 to the data line 77. This data transition continues until counter 228 counts eight pulses. At this time, the counter 22
Since the _Q4 output of No. 8 is at a high level, the latch circuit 224 is set and the DCL line 226 is set at a high level. These operations are repeated for each 8-bit data word.

It will be understood that the invention is not limited to the illustrated embodiments, but encompasses all modifications within the spirit of the claims.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a typical cellular radio telephone network including the interface system of the present invention;
The figure is a block diagram of the interface system of the present invention, Figures 3A to 3D are detailed circuit diagrams of the interface system, Figure 4 is a circuit diagram of the ring power supply board of the interface system, and Figure 5 is the same. FIG. 3 is a circuit diagram of an adapter board of the system. 1...Telephone, 5...Interface board, 7...
Ring power supply board, 9...Adapter board, 11...
Relay, 13...Decoder/converter circuit, 15
...Buffer, 17...Transistor, 19...Relay, 21, 23...Modulation chain, 25...Buffer, 27...Transistor, 29...NAND circuit,
31...Latch circuit, 31A, 31B...NOR circuit,
33...Gate circuit, 35...Inverter, 37...
NOR circuit, 37A, 37B, 37C, 37D...
Gate circuit, 39...Timer, 41...Transistor, 43...Dial tone generator, 43A, 43
B...Sine wave generator, 45...Amplifier, 47...Buffer, 47A, 47B...Amplifier, 49...Buffer,
51...NAND circuit, 53...NAND circuit, 55...
Multivibrator, 57... Inverter/buffer circuit, 59... Timer, 61... OR circuit, 63...
Flip-flop circuit, 65, 67...buffer,
69...OR circuit, 71...capacitor, 73...OR
circuit, 75...shift register, 77...data line,
79...One shot trigger circuit, 81...Buffer, 83...Capacitor, 85...Latch circuit, 87
...NAND circuit, 89...gate circuit, 90...inverter, 91, 93...one shot trigger circuit,
95...Mixed circuit, 97...One shot trigger circuit, 99...Buffer circuit, 101...Capacitor,
103...OR circuit, 105...transistor, 10
7...Resistor, 109...One-shot trigger circuit,
111... Counter, 113, 115... Converter, 117A to 117E... Gate circuit, 119
...Latch circuit, 121, 123...NOR circuit, 1
27...Latch circuit, 129,131...Gate circuit, 133...OR circuit, 138,139...NOR circuit, 141...Latch circuit, 143,145...Gate circuit, 147...Counter, 149,151,1
53, 155...Gate circuit, 157...Latch circuit, 157A, 157B...Gate circuit, 159...
Buffer circuit, 161... Inverter, 163... Gate circuit, 165, 167, 169, 171... Buffer circuit, 173... Multivibrator, 17
5...Output terminal, 177...Flip-flop, 17
9...OR circuit, 181...NAND circuit, 183...inverter, 185, 187...transistor, 18
9...Resistor, 191...Transistor, 193...Relay, 195...Converter circuit, 197...Capacitor, 199...Gate circuit, 209...Bridge circuit, 211...Resistor, 213...Transformer, 215...
Amplifier, 220...Latch circuit, 222...Delay circuit, 224...Latch circuit, 226...DCL line, 2
28...Counter, 230...Gate circuit, 232...
Inverter, 300... Telephone office, 302... Switchboard,
34...Remote system, 306...Car, 308...
Portable telephone, 310...system, 312...central switching box, 316...antenna.

Claims (1)

[Scope of Claims] 1. A telephone connection device that connects two wires to enable communication with a telephone, and 2.
A transceiver connection device that connects a line, a telephone number conversion device that inputs a telephone number consisting of a group of numbers using a touch tone or rotary dial from a telephone connection device, converts it into digital data and provides it to the transceiver connection device, and a telephone number conversion device a determining device for determining the last digit of a telephone number given at the transceiver connecting device; a transmitting signal device connected to the determining device for giving a transmission signal to the transceiver connecting device; a second detection device for detecting off-hook signals provided in the telephone connection device; an audio channel device forming a two-wire audio signal circuit between the telephone connection device and the transceiver connection device; a simulation device connected to the connecting device for providing voice frequency ring tone signals and dial tone signals to the telephone connecting device, the transceiver being capable of wireless communication with a remote radio transmitting/receiving system forming part of the telephone network; , an interface system for a telephone with a radio transceiver, which connects a rotary dial telephone to a radio transceiver used in a telephone communication system. 2. The telephone number conversion device includes a device that converts each digit of a telephone number into a binary code parallel output, and a digital conversion device that converts the binary code output into serial digital data and stores it in the transceiver to provide it to the transceiver connection device. An interface system according to claim 1, comprising: 3. The interface system according to claim 1, wherein the determining device includes a device for determining whether a predetermined digit of a telephone number is 1 or zero. 4. The interface system according to claim 3, wherein the determining device includes a device for determining the elapsed time after inputting one number. 5. The determining device includes a decimal decoder, a clock device that increments the decimal decoder each time a number from the digital conversion device is input, and a decoder device that decodes each number into a numerical value. The interface system according to claim 1, wherein whether the value of the number is 1 or zero is detected. 6. The interface system of claim 1, wherein the simulation device is configured to provide a continuous audio dial tone in response to the off-hook signal of the second detection device. 7. The interface system of claim 1, wherein the simulation device is configured to provide periodic audio signals in response to incoming and calling signals of the first detection device. 8 The audio channel device includes a 2-wire channel device connected to the telephone connection device, a 4-wire channel device connected to the transceiver connection device, and a 2-wire channel device that connects the two separate input and output channels of the 4-wire channel device. 2. The interface system according to claim 1, comprising a channel connection device that connects a single audio input/output channel in a channel device.