ADDING DATA TO A COMPRESSED DATA FRAME

摘要

Many low bit rate digital audio encoding systems generate data streams in which unused bits exist whenever the bit allocation function in the encoder does not utilize all available bits from a bit pool for encoding the audio signal. This occurs if the final bit allocation falls short of using all available bits or if the input audio does not require all available bits. Such unused bits are wasted bits that carry no useful information. Instead, all or some of such wasted bits are used to carry information. The replacement of wasted bits with information-carrying bits can be accomplished after a conventional encoder generates a standard bitstream. Alternatively, instead of replacing some or all unused bits in the bitstream with information-carrying bits after encoding, a modified encoder may insert information-carrying bits in some or all of the unused bit positions instead of null bits during the encoding process.