Patent ID: 8566105
Filing Date: 2013-10-22
Classification: G10L

Abstract:
1. An audio-data encoding apparatus comprising a lossy-core encoder unit configured to (1) receive an input audio signal and (2) perform lossy compression on the input audio signal to generate a core stream, the input audio signal being a pulse code modulated signal; a decoder unit configured to receive the core stream and generate a lossy signal; a delay-correcting unit configured to receive the input audio signal and generate a delayed audio signal with a delay equal to the time the decoder unit takes to generate the lossy signal; a subtraction unit configured to (1) receive as inputs the delayed audio signal and the lossy signal and (2) generate a signed residual signal by subtracting the lossy signal from the delayed audio signal; a rounding-off unit configured to (1) receive as an input the residual signal and (2) generate a rounded residual signal by dropping the sign bit of the residual signal and using the most significant bit of the residual signal as the sign bit of the rounded residual signal; a lossless-enhance encoder unit configured to (1) receive as an input the rounded residual signal and (2) generate an enhanced stream; and a stream-combining unit configured to (1) receive as inputs the core stream generated by the lossy-core encoder unit and the enhanced steam generated by the lossless-enhance encoder unit and (2) generate a scalable lossless stream, wherein,