Audio-encoding method and apparatus, audio-decoding method and apparatus, recoding medium thereof, and multimedia device employing same
First Claim
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1. An audio decoding method comprising:
- receiving a bitstream including a coded quantization differential index of an envelope of a sub-band in an audio spectrum; and
lossless decoding a coded quantization differential index of a current sub-band, by referring one of a plurality of tables based on a context which is obtained from a decoded quantization differential index of a previous sub-band,wherein the one of the plurality of tables is selected by one among a plurality of groups which are determined by the context.
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Abstract
Provided is an audio encoding method. The audio encoding method includes: acquiring envelopes based on a predetermined sub-band for an audio spectrum; quantizing the envelopes based on the predetermined sub-band; and obtaining a difference value between quantized envelopes for adjacent sub-bands and lossless encoding a difference value of a current sub-band by using a difference value of a previous sub-band as a context. Accordingly, the number of bits required to encode envelope information of an audio spectrum may be reduced in a limited bit range, thereby increasing the number of bits required to encode an actual spectral component.
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Citations
11 Claims
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1. An audio decoding method comprising:
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receiving a bitstream including a coded quantization differential index of an envelope of a sub-band in an audio spectrum; and lossless decoding a coded quantization differential index of a current sub-band, by referring one of a plurality of tables based on a context which is obtained from a decoded quantization differential index of a previous sub-band, wherein the one of the plurality of tables is selected by one among a plurality of groups which are determined by the context. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An audio decoding apparatus comprising:
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at least one processor configured to; receive a bitstream including a coded quantization differential index of an envelope of a sub-band in an audio spectrum; and lossless decode a coded quantization differential index of a current sub-band, by referring one of a plurality of tables based on a context which is obtained from a decoded quantization differential index of a previous sub-band, wherein the one of the plurality of tables is selected by one among a plurality of groups which are determined by the context. - View Dependent Claims (8, 9, 10, 11)
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Specification