Audio Coding Method and Apparatus
First Claim
1. An audio coding method comprising:
- determining a first modification weight according to linear spectral frequency (LSF) differences of an audio frame and LSF differences of a previous audio frame for each audio frame in an audio when a signal characteristic of the audio frame and a signal characteristic of the previous audio frame meet a preset modification condition;
modifying a linear predictive parameter of the audio frame according to the determined first modification weight; and
coding the audio frame according to the modified linear predictive parameter of the audio frame.
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Abstract
An audio coding method and apparatus, where the method includes, for each audio frame in audio, when a signal characteristic of the audio frame and a signal characteristic of a previous audio frame meet a preset modification condition, determining a first modification weight according to linear spectral frequency (LSF) differences of the audio frame and LSF differences of the previous audio frame, modifying a linear predictive parameter of the audio frame according to the determined first modification weight, and coding the audio frame according to a modified linear predictive parameter of the audio frame. According to the present disclosure, audio having a wider bandwidth can be coded while a bit rate remains unchanged or a bit rate slightly changes and a spectrum between audio frames is steadier.
29 Citations
22 Claims
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1. An audio coding method comprising:
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determining a first modification weight according to linear spectral frequency (LSF) differences of an audio frame and LSF differences of a previous audio frame for each audio frame in an audio when a signal characteristic of the audio frame and a signal characteristic of the previous audio frame meet a preset modification condition; modifying a linear predictive parameter of the audio frame according to the determined first modification weight; and coding the audio frame according to the modified linear predictive parameter of the audio frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An audio coding apparatus comprising:
a processor configured to; determine a first modification weight according to linear spectral frequency (LSF) differences of an audio frame and LSF differences of a previous audio frame for each audio frame in an audio when a signal characteristic of the audio frame and a signal characteristic of the previous audio frame meet a preset modification condition; modify a linear predictive parameter of the audio frame according to the first modification weight determined by the determining unit; and code the audio frame according to the modified linear predictive parameter of the audio frame. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
Specification