Noise Signal Processing Method, Noise Signal Generation Method, Encoder, Decoder, and Encoding and Decoding System
AssigneeHuawei Technologies Co., Ltd.
InventorZhe Wang
Life of this patent
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Abstract
A linear prediction-based noise signal processing method, includes obtaining a linear prediction coefficient of the noise signal, filtering a signal derived from the noise signal based on the linear prediction coefficient in order to obtain a linear prediction residual signal, obtaining excitation energy of the linear prediction residual signal and a spectral envelope of the linear prediction residual signal, and the spectral envelope, the excitation energy and the linear prediction coefficient are encoded.
Claims14
A noise signal processing method, comprising:
- obtaining, by an encoder comprising a processor, a linear prediction coefficient of a noise signal;
- filtering, by the encoder based on the linear prediction coefficient, a signal derived from the noise signal to obtain a linear prediction residual signal;
- obtaining, by the encoder, excitation energy of the linear prediction residual signal;
- obtaining, by the encoder, a frequency representation of the linear prediction residual signal;
- obtaining, by the encoder, a spectral envelope based on the frequency representation;
- and
- quantizing, by the encoder, the linear prediction coefficient, the spectral envelope, and the excitation energy;
- and
- sending a quantized linear prediction coefficient, a quantized spectral envelope, and a quantized excitation energy to a silence insertion descriptor (SID) frame.
A comfort noise signal generating method, comprising:
- decoding, by a decoder comprising a processor, a bitstream to obtain a linear prediction coefficient, excitation energy, and a residual spectral envelope;
- generating, by the decoder, a first excitation signal based on the residual spectral envelope;
- generating, by the decoder, a second excitation signal based on the excitation energy;
- and
- obtaining, by the decoder, a comfort noise signal based on the linear prediction coefficient, the first excitation signal, and the second excitation signal.
An encoder, comprising:
- a memory storage comprising instructions;
- and
- one or more processors in communication with the memory storage, the instructions causing the one or more processors to be configured to:
- obtain a linear prediction coefficient of a noise signal;
- filter, based on the linear prediction coefficient, a signal derived from the noise signal to obtain a linear prediction residual signal;
- obtain excitation energy of the linear prediction residual signal;
- obtain a frequency representation of the linear prediction residual signal;
- obtain a spectral envelope based on the frequency representation;
- quantize the linear prediction coefficient, the spectral envelope, and the excitation energy;
- and
- send a quantized linear prediction coefficient, a quantized spectral envelope, and a quantized excitation energy to a silence insertion descriptor (SID) frame.
A decoder, comprising:
- a memory storage comprising instructions;
- and
- one or more processors in communication with the memory storage, the instructions causing the one or more processors to be configured to:
- decode a bitstream to obtain a linear prediction coefficient, excitation energy, and a residual spectral envelope;
- generate a first excitation signal based on the residual spectral envelope;
- generate a second excitation signal based on the excitation energy;
- and
- obtain a comfort noise signal based on the linear prediction coefficient, the first excitation signal, and the second excitation signal.
Dependencies are inferred from the claim text.