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Teleconference terminal equipment and teleconference module

  • US 5,606,554 A
  • Filed: 05/25/1995
  • Issued: 02/25/1997
  • Est. Priority Date: 07/15/1991
  • Status: Expired due to Fees
First Claim
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1. A teleconference terminal equipment for exchanging pictures and speech with an opposite communicating terminal equipment through a communication circuit, comprising:

  • a united body including;

    communication control means for controlling transmission and reception of communication frames stipulated in CCITT recommendation H.221 through a digital communication channel provided by a basic interface of an ISDN, each communication frame being capable of containing video data, audio data, user data and control data,multiplex/demultiplex means for multiplexing and demultiplexing the video data, audio data, user data and control data of each of the communication frames to be transmitted by said communication control means and each of the communication frames received by the same, respectively,a picture codec which decodes a picture signal from said video data demultiplexed from within said communication frame by said multiplex/demultiplex means and then delivers said picture signal as an output, and which codes an input picture signal to-be-coded into said video data and then transfers said video data to said multiplex/demultiplex means, said video data being coded in conformity with an algorithm stipulated in CCITT recommendation H.261,a camera which supplies said picture codec with a picked-up picture signal as said picture signal to-be-coded,a display which displays a picture indicated by said picture signal decoded by said picture codec,an audio codec which decodes speech data from said audio data demultiplexed from within said communication frame by said multiplex/demultiplex means and then delivers the decoded speech data as an output, and which codes input speech data to-be-coded and then transfers the coded speech data to said multiplex/demultiplex means,a digital-to-analog converter by which said decoded speech data delivered from said audio codec is converted into an audio analog signal,a microphone which supplies a picked-up audio signal,an audio switch,an analog-to-digital converter which converts said picked-up audio signal into picked-up audio data and supplies the picked-up audio data to said audio switch,a loudspeaker which emits speech based on said audio analog signal produced by said digital-to-analog converter, anda digital audio input/output interface for connecting said audio switch to an external device which inputs and outputs audio data, said digital audio input/output interface supplies said audio switch with audio data from said external device, and supplies decoded speech data produced by said audio codec to said external device,said audio switch supplies either one of said picked-up audio data or said audio data to said audio codec as said speech data to-be-coded.

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