Estimation of mixing factors to generate high-band excitation signal
AssigneeQUALCOMM Incorporated
InventorsVenkatraman S. Atti, Venkatesh Krishnan
Life of this patent
Estimating the term…
Abstract
A method includes generating a high-band residual signal based on a high-band portion of an audio signal. The method also includes generating a harmonically extended signal at least partially based on a low-band portion of the audio signal. The method further includes determining a mixing factor based on the high-band residual signal, the harmonically extended signal, and modulated noise. The modulated noise is at least partially based on the harmonically extended signal and white noise.
Claims36
A method comprising:
- generating, at a speech encoder, a high-band residual signal based on a high-band portion of an audio signal;
- generating a harmonically extended signal at least partially based on a low-band portion of the audio signal;
- and
- determining a mixing factor based on the high-band residual signal, the harmonically extended signal, and modulated noise, wherein the modulated noise is at least partially based on the harmonically extended signal and white noise.
An apparatus comprising:
- a linear prediction analysis filter to generate a high-band residual signal based on a high-band portion of an audio signal;
- a non-linear transformation generator to generate a harmonically extended signal at least partially based on a low-band portion of the audio signal;
- and
- a mixing factor calculator to determine a mixing factor based on the high-band residual signal, the harmonically extended signal, and modulated noise, wherein the modulated noise is at least partially based on the harmonically extended signal and white noise.
A non-transitory computer readable medium comprising instructions that, when executed by a processor at a speech encoder, cause the processor to:
- generate a high-band residual signal based on a high-band portion of an audio signal;
- generate a harmonically extended signal at least partially based on a low-band portion of the audio signal;
- and
- determine a mixing factor based on the high-band residual signal, the harmonically extended signal, and modulated noise, wherein the modulated noise is at least partially based on the harmonically extended signal and white noise.
An apparatus comprising:
- means for generating a high-band residual signal based on a high-band portion of an audio signal;
- means for generating a harmonically extended signal at least partially based on a low-band portion of the audio signal;
- and
- means for determining a mixing factor based on the high-band residual signal, the harmonically extended signal, and modulated noise, wherein the modulated noise is at least partially based on the harmonically extended signal and white noise.
A method comprising:
- receiving, at a speech decoder, an encoded signal including a low-band excitation signal and high-band side information,
- wherein the high-band side information includes a mixing factor, and
- wherein the mixing factor is determined based on a high-band residual signal, a harmonically extended signal, and modulated noise;
- and
- generating a high-band excitation signal based on the high-band side information and the low-band excitation signal.
An apparatus comprising:
- a speech decoder configured to:
- receive an encoded signal including a low-band excitation signal and high-band side information,
- wherein the high-band side information includes a mixing factor, and
- wherein the mixing factor is determined based on a high-band residual signal, a harmonically extended signal, and modulated noise;
- and
- generate a high-band excitation signal based on the high-band side information and the low-band excitation signal.
A non-transitory computer readable medium comprising instructions that, when executed by a processor at a speech decoder, causes the processor to:
- receive an encoded signal including a low-band excitation signal and high-band side information,
- wherein the high-band side information includes a mixing factor, and
- wherein the mixing factor is determined based on a high-band residual signal, a harmonically extended signal, and modulated noise;
- and
- generate a high-band excitation signal based on the high-band side information and the low-band excitation signal.
An apparatus comprising:
- means for receiving an encoded signal including a low-band excitation signal and high-band side information,
- wherein the high-band side information includes a mixing factor, and
- wherein the mixing factor is determined based on a high-band residual signal, a harmonically extended signal, and modulated noise;
- and
- means for generating a high-band excitation signal based on the high-band side information and the low-band excitation signal.
Dependencies are inferred from the claim text.