Proceedings Article10.1109/ISCC.1998.702591
Linear PCM signal processing for audio processing unit in multipoint video conferencing system
Kyeong-Yeol Yu,Jong-Hoon Park,Jong-Hyeong Lee +2 more
- 01 Jun 1998
- pp 549-553
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TL;DR: The architecture and functions of the audio processing unit (APU) which deals with linear pulse code modulation (PCM) audio signals in the multipoint control unit (MCU), that used for a multipoint video conferencing system.
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Abstract: This paper describes the architecture and functions of the audio processing unit (APU) which deals with linear pulse code modulation (PCM) audio signals in the multipoint control unit (MCU), that used for a multipoint video conferencing system. The MCU receives audiovisual data from the subscriber, carries out video merging and audio mixing, and distributes the data to them. It also performs session setup, tear down, and control of the conference. The audio processing unit consists of a local processor and peripheral memories, a VME bus control block, a current speaker detection block, and an audio-mixing block. The current speaker detection block determines the channel of the current speaker by comparing the mean power of each channel. A mixing block mixes linear PCM audio data using speaker information and, performs echo cancellation. We propose another speaker detection algorithm using the scale factor of the MPEG-1 audio elementary stream. In simulation, it showed a similar result in speaker detection with that of linear PCM audio.
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Citations
Patent
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- 09 Aug 2001
TL;DR: In this paper, the authors propose a method, software program and system for processing audio data streams (206) transmitted in a communications network. But the method is not suitable for audio data streaming over wireless networks.
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Dominant speaker identification for multipoint videoconferencing
Ilana Volfin,Israel Cohen +1 more
TL;DR: This work proposes a novel method for dominant speaker identification using speech activity information from time intervals of different lengths, which demonstrates reduction in the number of false speaker switches and improved robustness to transient audio interferences.
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Dominant speaker identification for multipoint videoconferencing
Ilana Volfin,Israel Cohen +1 more
- 11 Dec 2012
TL;DR: This work proposes a novel method for dominant speaker identification using speech activity information from time intervals of different lengths, which demonstrates reduction in the number of false speaker switches and improved robustness to transient audio interferences.
Low cost embedded chairman/delegate units design for digital conference system
Yung-Chang Tseng,Tsung-Hsing Lin,Chiao-Hsuan Chuang,Tung-Lin Lee,Liang-Bi Chen,Chih-Lin Hung,Chao-Wen Wu +6 more
- 01 Nov 2012
TL;DR: A low cost embedded chairman/delegate units design is proposed in this paper, which is capable of digital audio processing for digital conference system and has the functionality of an automatic gain control, a dynamic range compression, and a 2.5W embedded class-D speaker amplifier.
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Multiparty Audioconferencing on Wireless Networks
R. Venkatesha Prasad,Vijay S. Rao,R. Muralishankar +2 more
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TL;DR: Multiparty audioconferencing on wireless networks is one such popular demand.
References
Multipoint multimedia conferencing
TL;DR: The development of multipoint multimedia services for conferencing is described, and the use of integrated services digital network (ISDN) as part of the work carried out in the European collaborative projects Multipoint Interactive Audiovisual Communication (MIAC) andmultipoint interactive AudiovISual System (MIAS).
72
A universal broadband multipoint teleconferencing service for the 21st century
M.E. Lukacs,D.G. Boyer +1 more
TL;DR: The Personal Presence system moves both the computing power behind advanced video processing and the connectivity behind video teleconferencing into the public switched telephone network where the costs of these resources can be shared by many users on an as used basis.
19
Detecting the Presence of Speech Using ADPCM Coding
TL;DR: A simple algorithm for locating the beginning and end of a speech utterance has been developed that has been tested in computer simulations and has been constructed with standard integrated circuit technology.
8
On multipoint control units for videoconferencing
Marc Willebeek-LeMair,Dilip D. Kandlur,Zon-Yin Shae +2 more
- 02 Oct 1994
TL;DR: Different approaches to the design of an MCU to implement these functions are presented and a related device-a transcoding gateway that enables conferencing between participants using different video/audio equipment is described.