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US 7,003,449 B1Granted
Method of encoding an audio signal using a quality value for bit allocation
AssigneeSTMicroelectronics Asia Pacific Pte Ltd
InventorsMohammed Javed Absar, Sapna George
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Abstract
A method for encoding an audio signal, including providing a masking function, representative of psychoacoustic masking; setting a quality value for data of the encoded signal, adjusting the masking function dependent upon the quality value; and allocating bits for quantization of the encoded signal based on the incremental masking function.
Claims20
A method for encoding an input audio signal to produce an encoded audio signal, comprising;
- providing a masking function, representative of psychoacoustic masking;
- setting a quality value for data of the encoded audio signal,
- adjusting the masking function dependent upon the quality value;
- and
- allocating bits for quantization of the encoded audio signal based on the adjusted masking function.
2 more elements
A method for encoding an input audio signal to produce a constant quality encoded audio signal, comprising;
- dividing the input audio signal into one or more frames;
- providing a masking function, representative of psychoacoustic masking;
- providing a quality value for data of the encoded audio signal, wherein the quality value is held constant;
- determining a frame length required to encode each frame at the quality value;
- adjusting the masking function dependent upon the frame length of each frame;
- and
- allocating bits within each frame for quantization of the encoded audio signal dependent upon the adjusted masking function.
4 more elements
Dependencies are inferred from the claim text.