Design and implementation of a two-way real-time communication system for audio over CATV networks

Choong Sang Cho; Yoo Rhee Oh; Young Han Lee; Hong Kook Kim

doi:10.1117/12.738980

10 September 2007 Design and implementation of a two-way real-time communication system for audio over CATV networks

Choong Sang Cho, Yoo Rhee Oh, Young Han Lee, Hong Kook Kim

Proceedings Volume 6777, Multimedia Systems and Applications X; 677709 (2007) https://doi.org/10.1117/12.738980
Event: Optics East, 2007, Boston, MA, United States

Abstract

In this paper, we design and implement a two-way real-time communication system for audio over cable television (CATV) networks to provide an audio-based interaction between the CATV broadcasting station and CATV subscribers. The two-way real-time communication system consists of a real-time audio encoding/decoding module, a payload formatter based on a transmission control protocol/Internet protocol (TCP/IP), and a cable network. At the broadcasting station, audio signals from a microphone are encoded by an audio codec that is implemented using a digital signal processor (DSP), where the MPEG-2 Layer II audio codec is used for the audio codec and TMS320C6416 is used for a DSP. Next, a payload formatter constructs a TCP/IP packet from an audio bitstream for transmission to a cable modem. Another payload formatter at the subscriber unpacks the TCP/IP packet decoded from the cable modem into audio bitstream. This bitstream is decoded by the MPEG-2 Layer II audio decoder. Finally the decoded audio signals are played out to the speaker. We confirmed that the system worked in real-time, with a measured delay of around 150 ms including the algorithmic and processing time delays.

Citation Download Citation

Choong Sang Cho, Yoo Rhee Oh, Young Han Lee, and Hong Kook Kim "Design and implementation of a two-way real-time communication system for audio over CATV networks", Proc. SPIE 6777, Multimedia Systems and Applications X, 677709 (10 September 2007); https://doi.org/10.1117/12.738980

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