Method for speech coding, method for speech decoding and their apparatuses
First Claim
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1. A speech decoding method for an apparatus having a decoder, the method comprising:
- receiving, by the decoder, a coded speech signal including a gain code;
decoding, by the decoder, a gain from the gain code;
decoding a time series vector based on the coded speech signal, the time series vector having a number of samples with zero-amplitude;
modifying the time series vector based on the decoded gain such that the number of samples with zero amplitude-value is changed; and
synthesizing a speech signal based on the modified time series vector.
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Abstract
A high quality speech is reproduced with a small data amount in speech coding and decoding for performing compression coding and decoding of a speech signal to a digital signal. In speech coding method according to a code-excited linear prediction (CELP) speech coding, a noise level of a speech in a concerning coding period is evaluated by using a code or coding result of at least one of spectrum information, power information, and pitch information, and various excitation codebooks are used based on an evaluation result.
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Citations
20 Claims
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1. A speech decoding method for an apparatus having a decoder, the method comprising:
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receiving, by the decoder, a coded speech signal including a gain code; decoding, by the decoder, a gain from the gain code; decoding a time series vector based on the coded speech signal, the time series vector having a number of samples with zero-amplitude; modifying the time series vector based on the decoded gain such that the number of samples with zero amplitude-value is changed; and synthesizing a speech signal based on the modified time series vector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A speech decoding apparatus having a decoder configured to:
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receive, by the decoder, a coded speech signal including a gain code; decode, by the decoder, a gain from the gain code; decode a time series vector based on the coded speech signal, the time series vector having a number of samples with zero-amplitude; modify the time series vector based on the decoded gain such that the number of samples with zero amplitude-value is changed; and synthesize a speech signal based on the modified time series vector. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification