Transmission of Audio Signals from Multiple Sources Riding on Single Loss-less Streaming Video Channel using Phase Vocoder by Applying Joint Source Channel Coding technique

摘要

This paper addresses a mechanism for joint source channel coding for transmission of audio signals transcoded to lossless video signals. The audio information is mapped into colour information with the help of the intelligence derived from a phase vocoder. Each pixel in the video frame , meant for the transmission of the audio signals over video, pertains to a specific frequency in the time domain. A couple of harmonic frequencies along with the fundamental frequency is required to be processed for carrying the voice intelligence. Hence, for conveying a speech signal for a given user, a number of colour pixels are utilised. This implies that the number of users that can be accommodated depends on the resolution that is supported by the video encoding scheme and the QOS needed for carrying the voice. At the source, we actuate phase vocoding and colour pixel multiplexing. The video stream which comprises number of pixels per frame pertaining to the resolution is multiplexed at the source and then transmitted using an appropriate lossless channel coding scheme. In this paper, we consider MPEG 4 A VC which can attain nearly 2:1 lossless compression (without motion estimation) with 4:4:4 encoding of YCbCr signal.