What is a low delay coder ?
A low delay audio coder provides data compression while keeping the delay caused by the encoding / decoding chain low enough to enable two-way communication applications, such as telephony and videoconferencing (typically around 30 ms for ideal processing). To this end, MPEG-4 provides both speech coders and the Low-Delay AAC coder. The latter is a derivative of the standard AAC coder which is defined in MPEG-4 Version 2 to enable high quality low delay audio coding for general audio signals including speech.
