Encoding device, decoding device, and method thereof
First Claim
Patent Images
1. A coding apparatus comprising:
- a coder, including a processor, that codes estimated information of a high frequency band spectrum of an input signal having a wideband spectrum comprising a low frequency band spectrum and the high frequency band spectrum; and
a limiter that acquires a first low frequency band spectrum in which a coded signal of the low frequency band spectrum of the input signal is decoded, and generates a second low frequency band spectrum by modifying a dynamic range of the first low frequency band spectrum to be closer to a dynamic range of a high frequency band spectrum,wherein the coder receives as input the wideband spectrum of the input signal as a reference signal, estimates, as the estimated information, a most similar spectrum to the high frequency band spectrum of the input signal using the wideband spectrum and the second low frequency band spectrum, and codes information about the estimated spectrum to supplant the high frequency band spectrum.
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Abstract
There is disclosed an encoding device capable of appropriately adjusting the dynamic range of spectrum inserted according to the technique for replacing a spectrum of a certain band with a spectrum of another band. The device includes a spectrum modification unit (112) which modifies a first spectrum S1(k) of the band 0≦k<FL in various ways to change the dynamic range so that a way of modification for obtaining an appropriate dynamic range is checked. The information concerning the modification is encoded and given to a multiplexing unit (115). By using a second spectrum S2(k) having a valid signal band 0≦k.
38 Citations
27 Claims
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1. A coding apparatus comprising:
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a coder, including a processor, that codes estimated information of a high frequency band spectrum of an input signal having a wideband spectrum comprising a low frequency band spectrum and the high frequency band spectrum; and a limiter that acquires a first low frequency band spectrum in which a coded signal of the low frequency band spectrum of the input signal is decoded, and generates a second low frequency band spectrum by modifying a dynamic range of the first low frequency band spectrum to be closer to a dynamic range of a high frequency band spectrum, wherein the coder receives as input the wideband spectrum of the input signal as a reference signal, estimates, as the estimated information, a most similar spectrum to the high frequency band spectrum of the input signal using the wideband spectrum and the second low frequency band spectrum, and codes information about the estimated spectrum to supplant the high frequency band spectrum. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 19, 20)
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17. A decoding apparatus comprising:
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a converter, including a processor, that generates a first low frequency band spectrum in which a decoded signal of code of a low frequency band spectrum included in code generated in a coding apparatus is converted to a frequency domain signal; a decoder that decodes code of a high frequency band spectrum included in the code generated in the coding apparatus; and a limiter that generates a second low frequency band spectrum in which the dynamic range of the first low frequency band spectrum is modified to be closer to the dynamic range of the high frequency band spectrum of a signal input to the coding apparatus according to spectrum modification information included in the code generated in the coding apparatus, wherein the decoder generates information about estimation of the high frequency band spectrum by decoding the code of the high frequency band spectrum and generates an estimated spectrum of the high frequency band spectrum by applying the information about estimation of the high frequency band spectrum to the second low frequency band spectrum. - View Dependent Claims (21, 22)
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18. A decoding apparatus comprising:
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a converter, including a processor, that generates a first low frequency band spectrum in which a decoded signal of code of a low frequency band spectrum included in code generated in a coding apparatus is converted to a frequency domain signal; a decoder that decodes code of a high frequency band spectrum included in the code generated in the coding apparatus; and a limiter that generates a second low frequency band spectrum in which a dynamic range of the first low frequency band spectrum is modified so as to become close to a dynamic range of the high frequency band spectrum of a signal input to the coding apparatus, wherein; the limiter estimates dynamic range modification information based on the first low frequency band spectrum and generates the second low frequency band spectrum by applying the estimated dynamic range modification information to the first low frequency band spectrum; and the decoder generates information about estimation of the high frequency band spectrum by decoding the code of the high frequency band spectrum and generates an estimated spectrum of the high frequency band spectrum by applying the information about estimation of the high frequency band spectrum to the second low frequency band spectrum. - View Dependent Claims (23, 24)
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25. A coding method comprising:
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coding, by a coder, estimated information of a high frequency band spectrum of an input signal having a wideband spectrum comprising a low frequency band spectrum and the high frequency band spectrum; acquiring a first low frequency band spectrum in which a coded signal of the low frequency band spectrum of the input signal is decoded; and generating a second low frequency band spectrum by modifying a dynamic range of the first low frequency band spectrum to be closer to a dynamic range of a high frequency hand spectrum, wherein coding estimated information of a high frequency band spectrum of an input signal receives as input the wideband spectrum of the input signal as a reference signal, estimates, as the estimated information, a most similar spectrum to the high frequency band spectrum of the input signal using the wideband spectrum and the second low frequency band spectrum, and codes information about the estimated spectrum to supplant the high frequency band spectrum.
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26. A decoding method comprising:
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generating a first low frequency band spectrum in which a decoded signal of code of a low frequency band spectrum included in code generated in a coding apparatus is converted to a frequency domain signal; decoding, by a decoder, code of a high frequency band spectrum included in the code generated in the coding apparatus; acquiring spectrum modification information included in the code generated in the coding apparatus; and generating a second low frequency band spectrum in which a dynamic range of the first low frequency band spectrum is modified to be closer to a dynamic range of a high frequency band spectrum of a signal input to the coding apparatus, wherein decoding code of a high frequency band spectrum generates information about estimation of the high frequency band spectrum by decoding the code of the high frequency band spectrum and generates an estimated spectrum of the high frequency band spectrum by applying the estimated information to the second low frequency band spectrum.
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27. A decoding method comprising:
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generating a first low frequency band spectrum in which a decoded signal of code of a low frequency band spectrum included in code generated in a coding apparatus is converted to a frequency domain signal; decoding, by a decoder, code of a high frequency band spectrum included in the code generated in the coding apparatus; and generating a second low frequency band spectrum in which a dynamic range of the first low frequency band spectrum is modified to be closer to a dynamic range of a high frequency band spectrum of a signal input to the coding apparatus, wherein; generating a second low frequency band spectrum estimates dynamic range modification information based on the first low frequency band spectrum and generates the second low frequency band spectrum by applying the estimated dynamic range modification information to the first low frequency band spectrum; and decoding code of a high frequency band spectrum generates information about estimation of the high frequency band spectrum by decoding the code of the high frequency band spectrum and generates an estimated spectrum of the high frequency band spectrum by applying the estimated information to the second low frequency band spectrum.
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Specification