Abstract
A particular method includes determining at a device a voicing classification of an input signal. The input signal corresponds to an audio signal. The method also includes controlling an amount of an envelope of a representation of the input signal based on the voicing classification. The method further includes modulating a white noise signal based on the controlled amount of the envelope. The method also includes generating a high band excitation signal based on the modulated white noise signal.
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Specification Information
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Technologies
Signal Processing
Product
Use Cases
Network OptimizationMobile TV/ Radio
Services
Claim
1. A method comprising:', 'determining, at a device, a voicing classification of an input signal, wherein the input signal corresponds to an audio signal;', 'controlling an amount of an envelope of a representation of the input signal based on the voicing classification;', 'modulating a white noise signal based on the controlled amount of the envelope; and', 'generating a high band excitation signal based on the modulated white noise signal.
2. The method of claim 1, wherein controlling the amount of the envelope includes controlling a characteristic of the envelope.
3. The method of claim 2, wherein the characteristic of the envelope includes at least one of a shape of the envelope, a magnitude of the envelope, a gain of the envelope, or a frequency range of the envelope.
4. The method of claim 3, wherein an extent of variation of the shape of the envelope is greater when the voicing classification corresponds to strongly voiced than when the voicing classification corresponds to strongly unvoiced.
5. The method of claim 3, wherein the frequency range of the envelope is controlled based on a cut-off frequency of a filter applied to the representation of the input signal.
6. The method of claim 5, further comprising determining the cut-off frequency based on the voicing classification.
7. The method of claim 6, wherein the filter includes a low-pass filter and wherein the cut-off frequency is greater when the voicing classification corresponds to strongly voiced than when the voicing classification corresponds to strongly unvoiced.
8. The method of claim I, wherein the device is a decoder or an encoder.
9. The method of claim I, wherein the envelope is a time-varying envelope
10. The method of claim 9, wherein the envelope is updated more than once per frame of the input signal.1. The method of claim 9, wherein the envelope is updated in response to an envelope adjuster receiving each sample of the audio signal
12. The method of claim 1 , wherein the envelope is adjusted by adjusting the representation of the input signal in a transform domain
13. The method of claim 1 , wherein the representation of the input signal includes a low band excitation signal of an encoded version of the audio signal or a high band excitation signal of the encoded version of the audio signal
14. The method of claim 1 , wherein the representation of the input signal includes a harmonically extended excitation signal and wherein the harmonically extended excitation signal is generated from a low band excitation signal of an encoded version of the audio signal
15. The method of claim 1 , further comprising generating a scaled white noise signal by combining a first ratio of an unmodulated white noise signal with a second ratio of the modulated white noise signal, wherein the first ratio and the second ratio are determined based on the voicing classification and wherein the high band excitation signal is based on the scaled white noise signal
16. An apparatus comprising:', 'a voicing classifier configured to determine a voicing classification of an input signal, wherein the input signal corresponds to an audio signal;', 'an envelope adjuster configured to control an amount of an envelope of a', 'representation of the input signal based on the voicing classification; a modulator configured to modulate a white noise signal based on the controlled amount of the envelope; and', 'an output circuit configured to generate a high band excitation signal based on the modulated white noise signal
17. The apparatus of claim 16, wherein the envelope adjuster is configured to control a characteristic of the envelope based on the voicing classification, and wherein the characteristic of the envelope includes at least one of a shape of the envelope, a magnitude of the envelope, a gain of the envelope, and a frequency range of the envelope
18. The apparatus of claim 17, wherein at least one of the shape of the envelope, the magnitude of the envelope, and the gain of the envelope is controlled by adjusting one or more poles of linear predictive coding (LPC) coefficients based on the voicing classification
19. The apparatus of claim 17, wherein at least one of the shape of the envelope, the magnitude of the envelope, and the gain of the envelope is controlled by adjusting coefficients of a filter based on the voicing classification and wherein the filter is applied by the modulator to the white noise signal to generate the modulated white noise signal.
20. The apparatus of claim 16, wherein the representation of the input signal includes a low band excitation signal of the input signal.
21. The apparatus of claim 16, wherein the representation of the input signal includes a high band excitation signal of the input signal.
22. The apparatus of claim 16, wherein the representation of the input signal includes a harmonically extended excitation signal.
23. The apparatus of claim 22, wherein the harmonically extended excitation signal is generated from a low band excitation signal of the input signal.
24. The apparatus of claim 16, further comprising:', 'a high band encoder configured to encode a high band portion of an audio signal based on the high band excitation signal; and', 'a transmitter configured to transmit an encoded audio signal to another device, wherein the encoded audio signal is an encoded version of the audio signal.
25. A computer-readable storage device storing instructions that, when executed by at least one processor, cause the at least one processor to:', 'determine a voicing classification of an input signal, wherein the input signal corresponds to an audio signal;', 'control an amount of an envelope of a representation of the input signal based on the voicing classification;', 'modulate a white noise signal based on the controlled amount of the envelope; and', 'generate a high band excitation signal based on the modulated white noise', 'signal.
26. The computer-readable storage device of claim 25, wherein controlling the amount of the envelope includes controlling a characteristic of the envelope based on the voicing classification.
27. The computer-readable storage device of claim 26, wherein the', 'characteristic of the envelope includes a frequency range of the envelope and wherein the frequency range of the envelope is controlled based on a cut-off frequency of a filter applied to the representation of the input signal.
28. An apparatus comprising:', 'means for determining a voicing classification of an input signal, wherein the input signal corresponds to an audio signal;', 'means for controlling an amount of an envelope of a representation of the input signal based on the voicing classification;', 'means for modulating a white noise signal based on the controlled amount of the envelope; and', 'means for generating a high band excitation signal based on the modulated white noise signal.
29. The apparatus of claim 28, wherein the representation of the input signal includes a low band excitation signal of the input signal, a high band excitation signal of the input signal, or a harmonically extended excitation signal, wherein the harmonically extended excitation signal is generated from the low band excitation signal of the input signal.
30. The apparatus of claim 28, wherein the means for determining, the means for controlling, the means for modulating, and the means for generating are integrated into one of a mobile communication device, a smart phone, a cellular phone, a laptop computer, a computer, a tablet, a personal digital assistant, a display device, a television, a gaming console, a music player, a radio, a digital video player, a digital video disc (DVD) player, a tuner, a camera, a navigation device, a coder, and a decoder.']
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SUMMARY
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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
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