METHODS, APPARATUSES FOR FORMING AUDIO SIGNAL PAYLOAD AND AUDIO SIGNAL PAYLOAD

摘要

An audio data frame can accommodate variable-rate coding modes selected according to channel configuration (eg. mono vs. multichannel) by switching between codec modes upon detection of marker bits and extension bits (signifying eg. core vs. extension coding) appended to the front of each frame. A formatter (303, fig. 3) outputs a bitstream (112) of audio data frames having eg. core coding marker bit 0 for 32 kbps mono data (401), a single extension coding marker bit 1 for 24.4 kbps stereo data (403), then further extension marker bits for multichannel data (405), robustness overhead data (407) or some other Feature X (409).