Audio Encoding Device, Audio Encoding Method, and Audio Encoding Program
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Abstract
By using a high-range sub-band signal, a correction coefficient corresponding to importance of auditory sense is calculated to correct a noise level and generate additional signal information, thereby accurately reflecting the noise level of the sub-band important in the auditory sense. Thus, it is possible to calculate additional signal information reflecting the noise level of the sub-band important in the auditory sense according to importance with a small calculation amount. The calculation amount can further be reduced by using a correction coefficient based on the characteristic of an ordinary audio signal.
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34 Claims
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1-15. -15. (canceled)
- 16. An audio encoding device for dividing an input signal into a low-frequency-band signal having a low frequency band and a high-frequency-band signal having a high frequency band, mixing a signal obtained by converting said low-frequency-band signal and a noise signal, and encoding noise signal information that is used in expressing the high-frequency-band signal, comprising a means for obtaining said noise signal information by allowing importance of each frequency component to be reflected into it.
- 25. An audio encoding method for dividing an input signal into a low-frequency-band signal having a low frequency band and a high-frequency-band signal having a high frequency band, mixing a signal obtained by converting said low-frequency-band signal and a noise signal, and encoding noise signal information that is used in expressing the high-frequency-band signal, comprising a step of obtaining said noise signal information by allowing importance of each frequency component to be reflected into it.
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34. An audio encoding program for dividing an input signal into a low-frequency-band signal having a low frequency band and a high-frequency-band signal having a high frequency band, mixing a signal obtained by converting said low-frequency-band signal and a noise signal, and encoding noise signal information that is used in expressing the high-frequency-band signal, wherein causing an information processing unit to execute the process of obtaining said noise signal information by allowing importance of each frequency component to be reflected into it.
Specification