Encoding apparatus, decoding apparatus and methods thereof
First Claim
1. An encoding apparatus that performs band enhancement using a low-band side spectrum and generates a high-band side spectrum, the encoding apparatus comprising:
- a band setter that inputs an input signal of a frequency domain and uses a characteristic of the input signal of the frequency domain as a basis, or inputs the input signal of the frequency domain and a coding parameter and uses at least one of the coding parameter and a characteristic of the input signal of the frequency domain as a basis, for generating band setting information that decides a first band of a high-band side set by the band enhancement; and
a high-band encoder that encodes the input signal of the first band decided based on the band setting information and generates high-band part coded information,wherein the band setter generates the band setting information that decides the first band and a low-band side second band by dividing the frequency domain into the first band and the second band,the encoding apparatus further comprising;
a fixed-band encoder that encodes the input signal of a band fixed beforehand in a low-band part of the second band and generates fixed-band coded information; and
a low-band encoder that encodes a difference between the input signal of the second band and the input signal of the fixed band and generates low-band part coded information.
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Accused Products
Abstract
Disclosed is an encoding apparatus that can efficiently encode a signal that is a broad or extra-broad band signal or the like, thereby improving the quality of a decoded signal. This encoding apparatus includes a band establishing unit (301) that generate, based on the characteristic of the input signal, band establishment information to be used for dividing the band of the input signal to establish a first band part of lower frequency side and a second band part of higher frequency side; a lower frequency encoding unit (302) for encoding, based on the band establishment information, the input signal of the first band part to generate encoded lower frequency part information; and a higher frequency encoding unit (303) for encoding, based on the band establishment information, the input signal of the second band part to generate encoded higher frequency part information.
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Citations
5 Claims
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1. An encoding apparatus that performs band enhancement using a low-band side spectrum and generates a high-band side spectrum, the encoding apparatus comprising:
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a band setter that inputs an input signal of a frequency domain and uses a characteristic of the input signal of the frequency domain as a basis, or inputs the input signal of the frequency domain and a coding parameter and uses at least one of the coding parameter and a characteristic of the input signal of the frequency domain as a basis, for generating band setting information that decides a first band of a high-band side set by the band enhancement; and a high-band encoder that encodes the input signal of the first band decided based on the band setting information and generates high-band part coded information, wherein the band setter generates the band setting information that decides the first band and a low-band side second band by dividing the frequency domain into the first band and the second band, the encoding apparatus further comprising; a fixed-band encoder that encodes the input signal of a band fixed beforehand in a low-band part of the second band and generates fixed-band coded information; and a low-band encoder that encodes a difference between the input signal of the second band and the input signal of the fixed band and generates low-band part coded information.
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2. An encoding apparatus that performs band enhancement using a low-band side spectrum and generates a high-band side spectrum, the encoding apparatus comprising:
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a band setter that inputs an input signal of a frequency domain and uses a characteristic of the input signal of the frequency domain as a basis, or inputs the input signal of the frequency domain and a coding parameter and uses at least one of the coding parameter and a characteristic of the input signal of the frequency domain as a basis, for generating band setting information that decides a first band of a high-band side set by the band enhancement; and a high-band encoder that encodes the input signal of the first band decided based on the band setting information and generates high-band part coded information, wherein the band setter compares energy of the input signal of a low-band side arbitrary third band within the frequency domain of the input signal and energy of the input signal of a fourth band of a higher-band side than the third band, and generates the band setting information that decides the first band based on a comparison result. - View Dependent Claims (3)
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4. An encoding apparatus that performs band enhancement using a low-band side spectrum and generates a high-band side spectrum, the encoding apparatus comprising:
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a band setter that inputs an input signal of a frequency domain and uses a characteristic of the input signal of the frequency domain as a basis, or inputs the input signal of the frequency domain and a coding parameter and uses at least one of the coding parameter and a characteristic of the input signal of the frequency domain as a basis, for generating band setting information that decides a first band of a high-band side set by the band enhancement; and a high-band encoder that encodes the input signal of the first band decided based on the band setting information and generates high-band part coded information, wherein the band setter generates the band setting information that decides the first band and a low-band side second band by dividing the frequency domain into the first band and the second band, wherein the band setter compares energy of the input signal of a low-band side third band within the frequency domain of the input signal and energy of the input signal of a fourth band of a higher-band side than the third band, and generates the band setting information that decides the first band and the second band based on a comparison result. - View Dependent Claims (5)
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Specification