Speech audio encoding device, speech audio decoding device, speech audio encoding method, and speech audio decoding method
First Claim
1. A speech/audio coding apparatus, comprising:
- a receiver that receives a time-domain speech input signal;
a processor thattransforms a time-domain speech input signal into a frequency-domain spectrum;
divides a frequency region of the spectrum in an extended band into a plurality of bands;
sets a limited band for each divided band in the current frame, when a difference between a first frequency with a first maximum amplitude in a spectrum of the divided band in a preceding frame and a second frequency with a second maximum amplitude in a spectrum of the divided band in a current frame is below a threshold, a width of the limited band in the current frame being narrower than the divided band and the limited band including the first frequency; and
encodes the spectrum in the limited band within each divided band in the current frame, and does not encode a spectrum outside the limited band within each divided band in the current frame,wherein the width of the limited band is predetermined and is set to 31.
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Abstract
A speech/audio coding apparatus includes a receiver that receives a time-domain speech input signal. The apparatus also includes a processor that transforms a time-domain speech input signal into a frequency-domain spectrum, and divides a frequency region of the spectrum in an extended band into a plurality of bands. The processor sets a limited band for each divided band in the current frame, a width of the limited band in the current frame being narrower than the divided band and the limited band including a first frequency. The processor further encodes the spectrum in the limited band within each divided band in the current frame, wherein the width of the limited band is predetermined and is set to 31.
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Citations
14 Claims
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1. A speech/audio coding apparatus, comprising:
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a receiver that receives a time-domain speech input signal; a processor that transforms a time-domain speech input signal into a frequency-domain spectrum; divides a frequency region of the spectrum in an extended band into a plurality of bands; sets a limited band for each divided band in the current frame, when a difference between a first frequency with a first maximum amplitude in a spectrum of the divided band in a preceding frame and a second frequency with a second maximum amplitude in a spectrum of the divided band in a current frame is below a threshold, a width of the limited band in the current frame being narrower than the divided band and the limited band including the first frequency; and encodes the spectrum in the limited band within each divided band in the current frame, and does not encode a spectrum outside the limited band within each divided band in the current frame, wherein the width of the limited band is predetermined and is set to 31. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A speech/audio coding method, comprising:
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transforming a time-domain speech input signal into a frequency-domain spectrum; dividing a frequency region of the spectrum in an extended band into a plurality of bands; setting a limited band for each divided band in the current frame, when a difference between a first frequency with a first maximum amplitude in a spectrum of the divided band in a preceding frame and a second frequency with a second maximum amplitude in a spectrum of the divided band in a current frame is below a threshold, a width of the limited band in the current frame being narrower than the divided band, and the limited band including the first frequency; and encoding the spectrum in the limited band within each divided band in the current frame, and not encoding a spectrum outside the limited band within each divided band in the current frame, wherein the width of the limited band is predetermined and is set to 31. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification