Method for speech coding, method for speech decoding and their apparatuses
AssigneeBlackBerry Limited
InventorTadashi YAMAURA
Life of this patent
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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
Claims21
-2. (canceled)
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.
A speech decoding apparatus having a decoder configured to:
- 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.
Dependencies are inferred from the claim text.