JPH07170578A - Digital portable telephone - Google Patents

Abstract

PURPOSE:To expand the function of the digital portable telephone. CONSTITUTION:The device is provided with a speech circuit 10 which performs the speech with the opposite party, DAT20, and external I/O connector 36. Switch circuits 31-34 which switch the digital signal line among the circuit 10, the DAT20, and the connector 36 are provided. With the circuits 31-34, the connection among them is changed and the digital signal is accessed among the circuit 10, the DAT20, and the connector 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital mobile phone.

[0002]

2. Description of the Related Art Although mobile phones have been put into practical use, most of them have a basic function, that is, they can only make a wireless call. Some models use a call signal line as an external facsimile device. It only has a connector to connect to.

[0003]

Even if a mobile phone is carried, it may not be possible to respond to the incoming call, for example, during a conference. Even if the content of the call is important, it is difficult to take a note of the content of the call when the user is moving. Further, even if it has a connector, it is not possible to send or receive a facsimile unless the facsimile device is carried with it.

In addition, a mobile telephone is considered to be a data service in which mobile communication is incorporated into an ISDN that is currently under maintenance, but these services cannot be received only by the mobile telephone.

The present invention is intended to solve the above problems.

[0006]

For this reason, in the present invention, when the reference numerals of the respective parts correspond to the embodiments described later, the communication circuit 10 for communicating with the other party and the DAT.
20, the external input / output connector 36, the call circuit 10, D
The switch circuit 31 to 34 for switching the digital signal line between the AT 20 and the external input / output connector 36 is provided, and the call circuit 10 is provided by the switch circuit 31 to 34.
The connection between the DAT 20 and the external input / output connector 36 is changed so that a digital signal can be accessed between the communication circuit 10, the DAT 20, and the external input / output connector 36.

[0007]

Function: The signal for accessing the mobile phone is DAT20.
Recording / playback by the external input / output connector 36
The external device 50 is accessed through.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 10 shows a call circuit for making an original call as a digital mobile phone. In the communication circuit 10, 11 is a speaker for receiving the voice, 12 is a microphone for transmitting, and 13 is a D / A.
A converter, 14 is an A / D converter, and 15 is a codec circuit. The codec circuit 15 performs an encoding process for transmission, for example, data compression, on the digital audio signal transmitted to the base station, and a receiving decoding process for the digital audio signal transmitted from the base station. For example, data decompression is performed.

Reference numeral 16 is a modulation / demodulation circuit, 17 is a high frequency circuit, and 18 is a transmitting / receiving antenna. The modulation / demodulation circuit 16 converts the transmitted digital audio signal into an upstream transmission signal and demodulates the downstream transmission signal transmitted from the base station to take out the digital audio signal. The high frequency circuit 17 performs power amplification of the transmission signal and selection and amplification of the reception signal.

Further, 20 indicates a DAT. In this example, this DAT 20 is designated by the applicant as a model name "NT-
The specifications are based on the DAT manufactured and sold as "1". Here, the specifications of "NT-1" are as follows.

Format specifications Recording system: Rotating 2-head helical scan system Azimuth recording system Tape width: 2.5 mm Tape running speed: 6.35 mm / sec Drum diameter: 14.8 mm Mechanical drum wrap angle: 100 ° Field frequency: 50 Hz track Pitch: Approx. 9.83 μm Azimuth angle: 27 ° Still angle: Approx. 4.44 ° Number of channels: 2 channels (stereo) Sampling frequency: 32 kHz / channel Quantization bit number: 17 bits / sample Audio compression method: μ-LAW15 polygonal line Instant compression 1
2-bit error correction code: Cross-interleave code Redundancy: 33% Recording modulation method: LDM-2 Others: 108 blocks / track 288 bits / 1 block Tape cassette specifications Size: 30mm (width) x 21.5mm (Depth) x 5mm (Thickness) Weight: 2.3g Tape width: 2.5mm Tape length: Approx. 18m (for 90 minutes) Others: Reciprocating use "NT-1" specifications Size: 113mm (width) × 55 mm (depth) × 23 mm (thickness) Weight: 147 g (including batteries) Power supply: 1 AA battery (1.5 V) Battery life: 7 hours or more during recording, 6 hours or more during playback (with alkaline batteries) ) Is.

Therefore, the data rate of the digital audio signal in the tape cassette is 32 kHz × 12 bits × 2 channels / second (= 768 kbit / second).

In the DAT 20, 21 is the tape cassette, 22 is an encoder circuit for performing an encoding process for recording, for example, adding an error correction code,
Reference numeral 23 is a modulation circuit for performing modulation processing for recording, 24 is a recording equalizer amplifier, and 25 is a rotary magnetic head for recording / reproducing. Reference numeral 26 is a reproduction equalizer amplifier, 27 is a demodulation circuit for performing reproduction demodulation processing, and 28 is a decoder circuit for performing reproduction decoding processing, for example, error correction.

Further, 31 to 34 are switch circuits, 35 is an input / output interface circuit for an external device, 36 is an external input / output connector, 40 is a system controller constituted by a microcomputer, and 41 is various operation keys.

Although not shown, the switch circuits 31 to 33 are switched and controlled by the syscon 40, the connection between the communication circuit 10, the DAT 20, and the connector 36 is changed so that a digital signal is transmitted between them. Is accessed. Further, data and control signals are accessed between the syscon 40 and each circuit. Also, FIG.
In FIG. 3, a digital input / output external device 50 is connected to the connector 36.

<General Call> During a general call, the voice signal from the microphone 12 is converted into an A / D converter 14
Is supplied to the digital audio signal and is A / D converted into a digital audio signal, and this digital audio signal is supplied to the codec circuit 15 to be encoded for transmission. Then, the digital signal that has been subjected to this encoding processing is the switching circuit 3
1 is supplied to the modulation / demodulation circuit 16 and converted into an upstream transmission signal, and this transmission signal is supplied to the antenna 18 through the high frequency circuit 17 and transmitted to the base station.

The downlink transmission signal from the base station is received by the antenna 18, and the reception signal is received by the high frequency circuit 1.
The digital signal is supplied to the modulation / demodulation circuit 16 through 7 and the digital signal is supplied to the codec circuit 15 where the decoding process for reception is performed and the original digital audio signal is decoded. Then, the decoded audio signal is supplied to the D / A converter 13 and is D / A converted into an original analog audio signal, and the audio signal is supplied to the speaker 11. Therefore, it is possible to make a call with the other party.

<Recording of Call Contents> When a predetermined key of the keys 41 is operated during a call, the voice signal of the user and the voice signal of the other party are added from the codec circuit 15 and data is compressed. Output digital audio signal, and this output signal is output to D through the switch circuit 33.
It is supplied to the AT 20 as digital input signals for the left and right channels.

Then, in the DAT 20, the supplied digital signal is supplied to the encoder circuit 22 to be encoded. In this case, since the recording bit rate of the DAT 20 is higher than the bit rate of the digital signal output from the switch circuit 33, for example, “0” is supplemented to the insufficient bits. In addition, data compression from 17 bits per sample to 12 bits in the above specifications is not performed.

The encoded signal is supplied to the modulation circuit 23 and converted into a recording signal, and the recording signal is supplied to the head 25 through the amplifier 24 and recorded in the cassette 21. In this case, since the signal from the switch circuit 33 is supplied to the left and right channels of the DAT 20 in parallel, the signal is supplied to the cassette 2
It means that the tape was double-written on 1.

<Reproduction and transmission of recorded call contents> When a predetermined key of the keys 41 is operated, a signal is reproduced from the cassette 21 by the head 25, and the reproduced signal is reproduced.
The digital signal is supplied to the demodulation circuit 27 through the amplifier 26 and demodulated. Then, this demodulated signal is supplied to the decoder circuit 28 and unnecessary "0" replenished at the time of recording.
Is removed, the original digital signals of the left and right channels are decoded, and the digital signals of the left and right channels are output from the DAT 20 as its reproduction signal.

In this case, as described above, at the time of recording,
Since the same signal is recorded in parallel on the left and right channels, the reproduced signals on the left and right channels are also the same signal if there is no error.

The reproduction signals of the left and right channels of the DAT 20 are supplied to the switch circuit 34. Further, an error flag signal indicating whether or not there is an error in the reproduced left and right channel digital signals is taken out from the decoder circuit 28, and this error flag signal is supplied to the switch circuit 34 as its control signal.

If no error has occurred in either the left or right channel, the reproduction signal of the left channel, for example, supplied thereto is taken out from the switch circuit 34, and the error flag is set to the left channel. When it is indicated that an error occurs in the reproduction signal of, the reproduction signal of the right channel is taken out from the switch circuit 34.

Then, the reproduction signal from the switch circuit 34 is decoded into the original digital signal supplied to the codec circuit 15, and this digital signal is supplied to the D / A converter 13. Therefore, from the speaker 11, the content of the call recorded in the cassette 21, that is,
You will hear the voice signal recorded during the call and the voice signal of the other party.

In this way, the call contents recorded during the call can be reproduced and listened to at any time.

When this <playback and transmission of recorded call contents> is performed during a call, the switch circuit 34
Output signal of the modulator / demodulator circuit 1 through the switch circuit 31.
6 is supplied. Therefore, the other party of the call can also listen to the recorded call content at the same time as himself / herself.

<Recording of voice memo> When a predetermined key of the keys 41 is operated and the user speaks into the microphone 11 when no telephone call is made, the voice signal of the voice signal is <Record of telephone call content>. The data is recorded on the cassette 21 in the same manner as in the case. However, in this case, since no call is being made, only the user's voice is recorded.

In this way, the voice can be recorded in the cassette 21 like a memo.

<Playback and transmission of voice recorded in memo> In the same manner as <playback of recorded call contents>, the voice recorded by <voice memo recording> can be played back and listened to at any time. You can In addition, the person you are talking to can be heard at the same time.

<Recording of Message> This is a function similar to that of an answering machine. For example, when an incoming call is received during a conference, but the incoming call cannot be answered, a message from the other party is recorded. is there.

That is, in this case, a predetermined key of the keys 41 is operated to set the message recording mode. Then, when there is an incoming call, the digital signal from the modulation / demodulation circuit 16 is transmitted through the switch circuit 33 to the DAT 20.
Are supplied as input signals to the left and right channels and are recorded in the cassette 21.

Therefore, when appropriate, in the same manner as the above-mentioned <playback and transmission of recorded telephone call contents> or <playback and transmission of memo-recorded voice>, the cassette 21 is read.
You can listen to the contents recorded in.

<Transmission and Reception of Signal from External Device> In this case, the digital signal from the external device 50 is supplied to the modulation / demodulation circuit 16 through the digital signal line of the connector 36 → interface circuit 35 → switch circuit 31, and Sent to the station.

Further, the digital signal from the base station is taken out from the modulation / demodulation circuit 16, and the taken digital signal is switched circuit 32 → interface circuit 35.
→ It is supplied to the external device 50 through the digital signal line of the connector 36.

<Recording and Reproduction of External Device Signal> In this case, the digital signal from the external device 50 is transmitted to the DAT 20 through the digital signal line of the connector 36-> interface circuit 35-> switch circuit 33 to the left and right channels thereof. Supplied as an input signal of the cassette 21
Recorded in.

When the digital signal is reproduced from the cassette 21, the reproduced signal is the switch circuit 34 → switch circuit 32 → interface circuit 35 → connector 3
It is supplied to the external device 50 through 6 digital signal lines.

Therefore, the digital signal accessed by the external device 50 can be recorded / reproduced in / from the cassette 21, that is, the cassette 21 as seen from the external device 50.
Can be used as an external storage device.

<Recording and Reproduction of Signal of External Device of Other Party>
This is a case where a digital signal is accessed between the external device of the call partner and the cassette 21.

That is, when a digital signal from the external device of the other party is output from the modulation / demodulation circuit 16, the digital signal of the left and right channels is sent to the DAT 20 through the switch circuit 33 as in the case of <recording of message>. It is supplied as an input signal and recorded in the cassette 21.

When the digital signal is reproduced from the cassette 21, the output signal of the switch circuit 34 is supplied to the modulation / demodulation circuit 16 through the switch circuit 31, as in the case of <reproduction and transmission of recorded call contents>. Sent.

Therefore, by combining this <recording and reproducing of the signal of the partner's external device> and the above-mentioned <recording and reproducing of the signal of the external device>, for example, the digital signal of the external device 50 is once stored in the cassette 21. It can be recorded and sent to the other party at an appropriate time. Alternatively, the digital signal from the other party can be temporarily recorded in the cassette 21, and the digital signal can be reproduced and supplied to the external device 50 when the external device 50 becomes ready for use.

Therefore, it is not necessary to carry the external device 50 such as a facsimile device together with the digital portable telephone. Alternatively, the ISDN service can be received offline.

<Others> In the above, <Record of message>
When performing, for example, at the beginning of the tape of the cassette 21,
Record a message such as "I can't answer the phone right now, so please tell me what you have to say." When you receive a call, first play this message and send it to the other party, and then, as described above, The message can be recorded in the cassette 21.

Further, in the above description, in the case of <recording of call contents>, the codec circuit 15 mixes the voice signal of its own and the voice signal of the other party and outputs it in the state of a data-compressed digital signal. However, even if the digital signal is not data compressed, DAT2
Since the recording data rate of 0 is large, there is no problem.

Further, in the above description, when recording a digital signal in the cassette 21, the digital signal is
Double writing was performed by supplying it to the AT 20 as input signals of the left and right channels, and this double writing prepared for an error. However, compared with the digital signal accessed to the DAT 20, the digital signal that can be recorded and reproduced in the cassette 21 Since the data rate is sufficiently large, for example, triple writing can be performed, and at the time of reproduction, a correct digital signal can be extracted by the majority logic of the reproduced digital signal.

[0047]

According to the present invention, the DAT 20 and the external connector 36 are provided in the digital mobile phone, and the communication circuit 10, the DAT 20, and the connector 36 are connected to each other.
I am able to connect freely. Therefore, in addition to <general call>, <record call content>, <play and send recorded call content>, <voice memo recording>, <play and send voice recorded memo>, <message>Recording>,<transmission and reception of signal of external device>, <recording and reproduction of signal of external device>, <recording and reproduction of signal of partner external device> and the like can be freely performed. Moreover, most of the above functions can be executed while moving.

The "NT-1" has the specifications as described above, and the DAT 20 may be a part of the "NT-1", so that the size, weight or current consumption of the mobile phone is increased. However, it is hardly a problem.

[Brief description of drawings]

FIG. 1 is a system diagram showing an example of the present invention.

[Explanation of symbols]

 10 call circuit 11 speaker for reception 12 microphone for transmission 13 D / A converter 14 D / A converter 15 codec circuit 16 modulation / demodulation circuit 17 high frequency circuit 20 DAT 21 tape cassette 22 encoder circuit 23 modulation circuit 25 rotary magnetic head 27 demodulation circuit 28 Decoder circuit 31-34 Switch circuit 35 Interface circuit 36 External input / output connector 40 System controller 50 External device

Claims (3)

[Claims] 1. A call circuit for making a call with the other party, a DAT, an external input / output connector, and a switch circuit for switching a digital signal line between the call circuit, the DAT, and the external input / output connector. The switch circuit includes the communication circuit and the DAT.
And a digital mobile phone adapted to access a digital signal between the communication circuit, the DAT and the external input / output connector by changing the connection between the external input / output connector and the external input / output connector. 2. The digital mobile phone according to claim 1, wherein the tape cassette used for the DAT has a size of 30 mm × 21.5 mm × 5 mm. 3. The digital mobile phone according to claim 1 or 2, wherein the specification of the net digital signal recorded / reproduced in the tape cassette used for the DAT is as follows: channel number: 2 channels sampling frequency: 32kHz Quantization bit rate: 12bits / 1 sample digital mobile phone.