Patent ID: 7702514
Filing Date: 2010-04-20
Classification: G10L

Abstract:
1. An audio encoding apparatus adapted for encoding an audio frame into an audio stream, said audio encoding apparatus comprising: a psychoacoustic module adapted for receiving and analyzing the audio frame using a psychoacoustic model so as to obtain a corresponding masking curve and window information; a transform module connected to said psychoacoustic module for receiving the window information, adapted for receiving and transforming the audio frame from the time domain to the frequency domain according to the window information so as to obtain a spectrum of the audio frame, and capable of dividing the spectrum into a plurality of frequency sub-bands; an encoding module including a quantization module including a packing module connected to said encoding module for packing the encoded frequency sub-bands in said buffer unit and side information into the audio stream, wherein said scale factor estimation unit adjusts a quantizable audio intensity of each of the frequency sub-bands in the current audio frame according to a cumulative total buffer utilization amount, which is the total amount of buffer space that has been used thus far for storing the encoded frequency sub-bands in said buffer unit, and an amount of buffer space used for storing a previously encoded audio frame in said buffer unit; and wherein said scale factor estimation unit estimates the scale factor for each of the frequency sub-bands in the current audio frame according to finally adjusted quantizable audio intensities of the frequency sub-bands in the current audio frame.