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WO1999009665A1 - Combine permettant des communications en semi-duplex au moyen d'un terminal cellulaire - Google Patents

Combine permettant des communications en semi-duplex au moyen d'un terminal cellulaire Download PDF

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Publication number
WO1999009665A1
WO1999009665A1 PCT/US1998/016838 US9816838W WO9909665A1 WO 1999009665 A1 WO1999009665 A1 WO 1999009665A1 US 9816838 W US9816838 W US 9816838W WO 9909665 A1 WO9909665 A1 WO 9909665A1
Authority
WO
WIPO (PCT)
Prior art keywords
cellular terminal
speaker
signal
microphone
user
Prior art date
Application number
PCT/US1998/016838
Other languages
English (en)
Inventor
Thomas Anthony Przelomiec
Robert J. Blaser
Seyed Tabaian
Original Assignee
Ericsson Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ericsson Inc. filed Critical Ericsson Inc.
Priority to AU91045/98A priority Critical patent/AU9104598A/en
Publication of WO1999009665A1 publication Critical patent/WO1999009665A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H04W4/10—Push-to-Talk [PTT] or Push-On-Call services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/3827—Portable transceivers
    • H04B1/3877—Arrangements for enabling portable transceivers to be used in a fixed position, e.g. cradles or boosters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/40—Connection management for selective distribution or broadcast
    • H04W76/45—Connection management for selective distribution or broadcast for Push-to-Talk [PTT] or Push-to-Talk over cellular [PoC] services

Definitions

  • the present invention relates generally to cellular communications systems and, more particularly, to a handset accessory which provides half-duplex communications through a full- duplex cellular terminal.
  • a base station communicates across a control channel and voice channels with mobile terminals which are within the cellular area of the base station.
  • the base station assigns a voice channel to a mobile terminal and maintains full-duplex communications with the mobile terminal across the voice channel.
  • Group cellular calls have been proposed in which several terminals are assigned the same voice channel so that audio signals are broadcast between the grouped terminals.
  • terminals within a group are assigned the same time-slot on a shared voice channel. With full-duplex communications between the terminals in the group, background noise and audio signals from any simultaneously speaking users can combine to render communications within the group confusing and unintelligible.
  • a push-to-talk (PTT) controller which is connected to a full-duplex mobile cellular terminal.
  • the cellular terminal outputs a speaker signal and receives a microphone input signal.
  • the PTT controller includes a speaker, a microphone, and a switch.
  • the speaker broadcasts the speaker signal from the cellular terminal to a user.
  • the microphone generates the microphone input signal which is provided to the cellular terminal.
  • the switch has a first operation state and a different second operation state. In the first operation state, the switch electrically connects the speaker signal from the cellular terminal to the speaker while substantially electrically isolating the microphone input signal, which is output by the microphone, from the cellular terminal.
  • the switch electrically connects the microphone input signal from the microphone to the cellular terminal while substantially electrically isolating the speaker from the speaker signal which is output by the cellular terminal.
  • the switch transitions between the first state and the second state in response to a user' s indicated desire to transmit an audio signal through the cellular terminal .
  • the PTT controller provides half-duplex audio communications through the full-duplex cellular terminal. Consequently, users can monitor audio communications by one or more other users within a group call while the microphones, in terminals with which users are not depressing the switches, are muted to minimize noise in the communicated signals. Moreover, the user can monitor broadcasted communications by the speaker while the PTT controller and cellular terminal are remotely located from the user.
  • FIG. 1 is a perspective view of a prior art mobile cellular terminal
  • Fig. 2 is a front view of the connector which is shown in Fig. 1;
  • Fig. 3 is a perspective view of a push-to-talk (PTT) handset accessory according to the present invention.
  • Fig. 4 is a circuit diagram of the PTT handset which is shown in Fig. 3.
  • a prior art mobile cellular terminal 10 is shown in Fig. 1.
  • the terminal 10 includes a housing 12 in which a speaker 14, a microphone 16, and an accessory connector 18 are disposed.
  • a battery 20 is releasably connected to the terminal 10.
  • the conventional connector 18 includes 12 electrical contacts 22.
  • the contacts 22 include a power contact 24, a ground contact 26, a speaker output contact 28, a microphone input contact 30, an audio ground contact 32, a hook contact 34, a data output contact 36, and a data input contact 38.
  • the connector 18 further includes windows 42.
  • the power contact 24 and the ground contact 26 are electrically connected to the battery 20 (Fig. 1) .
  • the speaker output contact 28 is electrically connected to conventional speaker circuitry within the housing 12 which provides an audio signal to the speaker 14 (Fig. 1) .
  • the microphone input contact 30 is electrically connected to conventional microphone circuitry within the housing 12 which receives and processes an audio signal from the microphone 16 (Fig. 1) .
  • the terminal 10 determines whether an accessory is connected to the connector 18 from a signal on the hook contact 34.
  • the terminal 10 provides a serial digital data signal to the data output connector 36 and receives a serial digital data signal on the data input connector 36.
  • a PTT controller 50 accessory according to one embodiment of the present invention is shown in Fig. 3.
  • the PTT controller 50 includes a connector 52, a PTT handset 54, and a cable 56 which is electrically connected therebetween.
  • the connector 52 includes a connector housing 58, a pair of retaining posts 60 which extend outwardly from the housing 58, and 12 electrical spring contacts 62.
  • the retaining posts 60 are aligned with the windows 42 (Fig. 2) of the connector 18 (Fig. 2) and the spring contacts 62 are aligned with the contacts 22 (Fig. 2) .
  • an electronic interface is formed between the spring contacts 62 and 22 (Fig. 2) which conducts electrical signals between the connector 18 (Fig. 2) and the PTT handset 54.
  • the PTT handset 54 includes a housing 64 in which a depressable PTT switch 66, a speaker 68, a microphone 70, a volume control 72, and a call button 74 are disposed.
  • the circuitry of the PTT handset 54 when the PTT controller 50 (Fig. 1) is electrically connected to the cellular terminal 10 (Fig. 1), is shown in Fig. 4.
  • the hook contact 34 is tied to the power contact 24 to signal the connection of PTT controller 50 to the terminal 10.
  • Audio signals from the speaker output contact 28, of terminal 10 are selectively conducted through the PTT switch 66, variably attenuated by the volume control 72, shown as a variable resistor, amplified by an amplifier 80, and conducted to the speaker 68 where they are broadcast to the user.
  • the user can monitor a group call while the terminal 10 is remotely located from the user's ear, such as when the terminal 10 is connected to the user's waist belt.
  • the user adjustably increases the volume of the audio signal, via the volume control 72, to compensate for noisy environments, such as along a road with passing cars, or to monitor a more remotely located terminal.
  • Audio signals which are received by the microphone 70 are amplified by an amplifier 82 and selectably conducted through the PTT switch 66 to the microphone input contact 30, of terminal 10 (Fig. 1) .
  • the amplifiers, 80 and 82 receive power from the battery 20 (Fig. 1) through the power and ground contacts 24 and 26.
  • the PTT switch 66 is a conventional double-pole single-throw switch which is biased, such as by a spring (not shown) , to conduct the audio signal from the audio output connector 28 to the speaker 68, while electrically isolating the microphone 70 from the microphone input contact 30, when the PTT switch 66 is not depressed. Consequently, while the PTT switch 66 is not depressed, the microphone 70 is muted and the speaker 68 is connected to broadcast any group communications from the terminal 10 (Fig. 1) . In contrast, when the PTT switch 66 is depressed, the audio signal from the microphone 70 is conducted to the microphone input contact 30 while the speaker 68 is electrically isolated from the audio output connector 28 to mute the speaker and avoid feedback from the speaker 68 through the microphone 70.
  • a voice activated circuit 68 Connected in parallel to the PTT switch 66 is a voice activated circuit 68 which provides similar mutually exclusive connectivity as the PTT switch 66.
  • the voice activated circuit 68 conducts the audio signal from the audio output connector 28 to the speaker 68.
  • the voice activated circuit 68 responds to a signal level from the microphone 70 above a threshold amount by connecting the audio signal from the microphone 70 to the microphone input contact 30.
  • the PTT controller 50 (Fig. 3) provides half- duplex audio communications through the cellular terminal 10 (Fig. 1) .
  • the user can signal the terminal 10 (Fig. 1) to establish a group call by momentarily depressing the call button 74 on the PTT handset 54 (Fig. 3) .
  • the call button 74 is a conventional signal- pole single-throw switch which, when depressed, conducts the digital signal from the data output contact 36 to the data input contact 38 to signal the terminal 10 to establish a group call.
  • the call button 74 can modify the digital signal which is conducted between the contacts 36 and 38, such as by inverting the digital signal with an invertor or shifting the phase or duty cycle of the digital signal with a conventional inductive- capacitive circuit, to signal the terminal 10.
  • the terminal 10 responds to the signaling on the data input contact 38 by calling a predetermined phone number.
  • a base station and associated network switch can then assign a common voice channel, and time-slot for TDMA systems, to a predetermined group of other terminals which have been assigned the called phone number.
  • the base station and associated network switch can respond to the called phone number by, in turn, calling a predetermined phone number for each of the terminals in the predetermined group and assigning a common voice channel, and time- slot for TDMA systems, to the grouped terminals.
  • the base station and associated network switch can assign different voice channels to each grouped terminal and distribute communications signals from each voice channel to the other voice channels.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention a pour objet un appareil auxiliaire et un procédé correspondant permettant des communications en semi-duplex au moyen d'un terminal cellulaire duplex intégral. Le terminal cellulaire émet un signal de haut-parleur et reçoit un signal d'entrée du microphone. L'appareil auxiliaire comprend un haut-parleur, un microphone et un interrupteur. Le haut-parleur transmet le signal de haut-parleur du terminal cellulaire à l'utilisateur. Le microphone génère le signal d'entrée du microphone, qui est fourni au terminal cellulaire. L'interrupteur possède un premier mode de fonctionnement et un second mode de fonctionnement, différent du premier. Dans le premier mode de fonctionnement, le commutateur connecte électriquement au haut-parleur le signal de haut-parleur, qui vient du terminal cellulaire, tout en assurant une bonne isolation électrique entre la sortie du signal d'entrée du microphone, émis par le microphone, et le terminal cellulaire. Dans un second mode de fonctionnement, l'interrupteur connecte électriquement au terminal cellulaire le signal d'entrée du microphone, qui vient du microphone, tout en assurant une bonne isolation électrique entre le haut-parleur et le signal de haut-parleur, émis par le terminal cellulaire. L'interrupteur se déplace entre les premier et second modes en réponse à une entrée utilisateur, et ce pour assurer des communications en semi-duplex au moyen d'un terminal cellulaire duplex intégral.
PCT/US1998/016838 1997-08-14 1998-08-12 Combine permettant des communications en semi-duplex au moyen d'un terminal cellulaire WO1999009665A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU91045/98A AU9104598A (en) 1997-08-14 1998-08-12 Handset for half-duplex communications through a cellular terminal

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US90931197A 1997-08-14 1997-08-14
US08/909,311 1997-08-14

Publications (1)

Publication Number Publication Date
WO1999009665A1 true WO1999009665A1 (fr) 1999-02-25

Family

ID=25427005

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/016838 WO1999009665A1 (fr) 1997-08-14 1998-08-12 Combine permettant des communications en semi-duplex au moyen d'un terminal cellulaire

Country Status (2)

Country Link
AU (1) AU9104598A (fr)
WO (1) WO1999009665A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2400776A3 (fr) * 2000-06-15 2012-08-08 Motorola Mobility, Inc. Téléphone cellulaire avec une communication radio et cellulaire simultanée
WO2014035232A1 (fr) * 2012-08-30 2014-03-06 Motorola Solutions, Inc Procédé et appareil permettant de outrepasser un poussoir d'émission afin d'activer un microphone

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0203819A2 (fr) * 1985-05-30 1986-12-03 Nec Corporation Système téléphonique sans cordon
WO1993013604A1 (fr) * 1991-12-23 1993-07-08 Motorola, Inc. Modules de boitiers pour piles pour telephone cellulaire avec ou sans microphone integre
EP0563459A1 (fr) * 1991-05-06 1993-10-06 Shih-Chung Chen Microphone commande vocale et haut-parleur pour un radio émetteur-récepteur
US5506837A (en) * 1993-02-11 1996-04-09 U.S. Philips Corporation Cellular radio communication system which is selectively convertible into a trunked radio communication system for group calls

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0203819A2 (fr) * 1985-05-30 1986-12-03 Nec Corporation Système téléphonique sans cordon
EP0563459A1 (fr) * 1991-05-06 1993-10-06 Shih-Chung Chen Microphone commande vocale et haut-parleur pour un radio émetteur-récepteur
WO1993013604A1 (fr) * 1991-12-23 1993-07-08 Motorola, Inc. Modules de boitiers pour piles pour telephone cellulaire avec ou sans microphone integre
US5506837A (en) * 1993-02-11 1996-04-09 U.S. Philips Corporation Cellular radio communication system which is selectively convertible into a trunked radio communication system for group calls

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2400776A3 (fr) * 2000-06-15 2012-08-08 Motorola Mobility, Inc. Téléphone cellulaire avec une communication radio et cellulaire simultanée
EP2400777A3 (fr) * 2000-06-15 2012-08-08 Motorola Mobility, Inc. Téléphone cellulaire avec une communication radio et cellulaire simultanée
WO2014035232A1 (fr) * 2012-08-30 2014-03-06 Motorola Solutions, Inc Procédé et appareil permettant de outrepasser un poussoir d'émission afin d'activer un microphone

Also Published As

Publication number Publication date
AU9104598A (en) 1999-03-08

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