Abstract
Proposed is a method and apparatus for determining a weighting function for quantizing a linear predictive coding (LPC) coefficient and having a low complexity. The weighting function determination apparatus may convert an LPC coefficient of a mid-subframe of an input signal to one of a immitance spectral frequency (ISF) coefficient and a line spectral frequency (LSF) coefficient and may determine a weighting function associated with an importance of the ISF coefficient or the LSF coefficient based on the converted ISF coefficient or LSF coefficient.
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Claim
1. An encoding apparatus for enhancing a quantization efficiency in linear predictive encoding, the apparatus comprising:a coefficient conversion unit to obtain one of a line spectral frequency (LSF) coefficient and an immittance spectral frequency (ISF) coefficient from a linear predictive coding (LPC) coefficient of an input signal;a weighting function determination unit to determine a weighting function, based on a magnitude of a spectral bin corresponding to a frequency of the ISF coefficient or the LSF coefficient, wherein the weighting function is based on a maximum value of the magnitude of the spectral bin corresponding to the frequency of the ISF coefficient or the LSF coefficient and a magnitude of at least one neighboring spectral bin; and a quantization unit to quantize the ISF coefficient or the LSF coefficient using the determined weighting function.
2. The encoding apparatus of claim 1, wherein the weighting function determination unit determines the weighting function based on at least one of a frequency band, encoding mode information, and frequency analysis information.
3. The encoding apparatus of claim 1, wherein the weighting function determination unit determines a final weighting function by combining the weighting function based on the magnitude and a weighting function based on frequency information.
4. The encoding apparatus of claim 3, wherein the weighting function based on the frequency information is expressed by a bark scale.5. An encoding method for enhancing a quantization efficiency in linear predictive encoding, the method comprising: obtaining one of a line spectral frequency (LSF) coefficient and an immittance spectral frequency (ISF) coefficient from a linear predictive coding (LPC) coefficient of an input signal;determining a weighting function based on a magnitude of a spectral bin corresponding to a frequency of the ISF coefficient or the LSF coefficient, wherein the weighting function is based on a maximum value of the magnitude of the spectral bin corresponding to the frequency of the ISF coefficient or the LSF coefficient and a magnitude of at least one neighboring spectral bin; and quantizing the ISF coefficient or the LSF coefficient using the determined weighting function.6. The encoding method of claim 5, wherein the determining comprises determining the weighting function based on at least one of a frequency band, encoding mode information, and frequency analysis information.7. The encoding method of claim 5, wherein the determining comprises determining a final weighting function by combining the weighting function based on the magnitude and a weighting function based on frequency information.8. The encoding method of claim 7, wherein the weighting function based on the frequency information is expressed by a bark scale.9. A non-transitory computer-readable medium storing computer readable instructions to control at least one processor to implement the method of', 'claim 5.']
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