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Browse Prior Art Database

AUDIO DELAY AND SPEECH COLLISION RESOLUTION

IP.com Disclosure Number: IPCOM000007907D
Original Publication Date: 1996-Nov-01
Included in the Prior Art Database: 2002-May-03
Document File: 2 page(s) / 95K

Publishing Venue

Motorola

Related People

Steven Charnota: AUTHOR [+2]

Abstract

The communication system (i.e., the iDEN Sys- tem) resolves the speech collision due to audio delay by muting (i.e., blocking) the speech in one direc- tion for a period of time approximately equal to the communication system round-trip audio delay. The muting period begins when a speaker identification period (during which exactly one user is speaking) is followed by a silent period (during which neither user is speaking) followed by speech from the user that will not be muted. Two methods are possible to determine which users' speech is muted: (1) mute the user that was the speaker during the speaker identification period or (2) mute the user that was the listener during the speaker identification period.

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M-&A Technical Developments

AUDIO DELAY AND SPEECH COLLISION RESOLUTION

by Steven Charnota and Tony Belkin

BACKGROUND

SOLUTION

  The communication system (i.e., the iDEN Sys- tem) resolves the speech collision due to audio delay by muting (i.e., blocking) the speech in one direc- tion for a period of time approximately equal to the communication system round-trip audio delay. The muting period begins when a speaker identification period (during which exactly one user is speaking) is followed by a silent period (during which neither user is speaking) followed by speech from the user that will not be muted. Two methods are possible to determine which users' speech is muted: (1) mute the user that was the speaker during the speaker identification period or (2) mute the user that was the listener during the speaker identification period.

  The round trip audio delay is approximately equal to the sum of the minimum audio delay in each direction within the communication system. This is the time required for User-A to hear a pause in User-B's speech and then for User-B to hear User-A's speech. The silent period is necessary to avoid mut- ing when speech collision is intentional (i.e., when one user chooses to interrupt the speech of the other user). The speaker identification period is necessary to avoid muting speech from both users following intentional speech collision. Either method of selecting the users' speech to be muted (recent speaker or recent listener) will avoid unconditionally muting the speech ofthe same user.

  In the iDEN System the solution would be implemented in the subscriber unit and tixed net- work equipment transcoder. The subscriber unit would mute speech destined for the iDEN user and the transcoder would mute speech destined for the public telephone network user.

  A duplex communication path (such as the tel- ephone interconnect connection...