Method and apparatus for encoding and decoding high frequency signal
First Claim
1. A method of encoding a high band signal in an encoding device, the method comprising:
- extracting, performed by at least one processor, a coefficient from linear prediction of a high band signal;
encoding the extracted coefficient;
generating a signal based on a low band signal and the extracted coefficient;
obtaining a gain from an energy value of the high band signal and an energy value of the generated signal;
adjusting, by the encoding device, the gain in consideration of reducing noise in a reconstructed signal at a decoding device;
encoding the adjusted gain; and
transmitting a bitstream including the encoded coefficient and the encoded gain to the decoding device,wherein the encoding the extracted coefficient comprises performing an interpolation process on the extracted coefficient, andwherein the high band signal has at least one of audio characteristic and speech characteristic.
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Abstract
Provided are a method and apparatus for encoding and decoding a high frequency signal by using a low frequency signal. The high frequency signal can be encoded by extracting a coefficient by linear predicting a high frequency signal, and encoding the coefficient, generating a signal by using the extracted coefficient and a low frequency signal, and encoding the high frequency signal by calculating a ratio between the high frequency signal and an energy value of the generated signal. Also, the high frequency signal can be decoded by decoding a coefficient, which is extracted by linear predicting a high frequency signal, and a low frequency signal, and generating a signal by using the decoded coefficient and the decoded low frequency signal, and adjusting the generated signal by decoding a ratio between the generated signal and an energy value of the high frequency signal.
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Citations
18 Claims
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1. A method of encoding a high band signal in an encoding device, the method comprising:
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extracting, performed by at least one processor, a coefficient from linear prediction of a high band signal; encoding the extracted coefficient; generating a signal based on a low band signal and the extracted coefficient; obtaining a gain from an energy value of the high band signal and an energy value of the generated signal; adjusting, by the encoding device, the gain in consideration of reducing noise in a reconstructed signal at a decoding device; encoding the adjusted gain; and transmitting a bitstream including the encoded coefficient and the encoded gain to the decoding device, wherein the encoding the extracted coefficient comprises performing an interpolation process on the extracted coefficient, and wherein the high band signal has at least one of audio characteristic and speech characteristic. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of generating a high band signal in a decoding device, the method comprising:
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receiving a bitstream including an encoded coefficient and an encoded gain, from an encoding device; decoding, performed by at least one processor, the encoded coefficient obtained from linear prediction of a high band signal, and an encoded low band signal from the bitstream; generating a signal based on the decoded coefficient and the decoded low band signal; decoding the encoded gain corresponding to a ratio between an energy value the generated signal and an energy value of the high band signal from the bitstream; adjusting the generated signal based on the decoded gain; and generating a reconstructed signal based on the adjusted signal, wherein the decoding the encoded coefficient is performed in consideration of an interpolation process, wherein the encoded gain is adjusted at the encoding device in consideration of reducing noise in the reconstructed signal; and wherein the high band signal has at least one of audio characteristic and speech characteristic. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification