Patent ID: 7409350

Claim:
An audio processing method in an audio encoding system, an audio frame comprising N frequency subbands, an Ith frequency subband among the N frequency subbands comprising M audio samples and having an Ith psychoacoustic masking value N and M being positive integers, I being an integer index ranging from l to N, the method comprising the following steps: (a) calculating an Ith offset of the Ith frequency subband; (b) inputting the Ith psychoacoustic masking value and the Ith offset into a first projection formula to generate an Ith first projection value; (c) according to the Ith first projection value and a limit range, determining an Ith scale factor; (d) according to the Ith scale factor, adjusting the M audio samples in the Ith frequency subband; and (e) generating an audio stream based on the adjusted audio samples.