Apparatus and method determining weighting function for linear prediction coding coefficients quantization
AssigneeSamsung Electronics Co., Ltd.
InventorsHo Sang SUNG, Eun Mi OH
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Abstract
An apparatus determining a weighting function for line prediction coding coefficients quantization converts a linear prediction coding (LPC) coefficient of an input signal into one of a line spectral frequency (LSF) coefficient and an immitance spectral frequency (ISF) coefficient and determines a weighting function associated with one of an importance of the ISF coefficient and importance of the LSF coefficient using one of the converted ISF coefficient and the converted LSF coefficient.
Claims20
An apparatus for quantizing a signal including at least one of a speech signal and an audio signal, the apparatus comprising:
- a coefficient conversion unit, implemented by a processor, configured to obtain a line spectral frequency (LSF) coefficient or an immittance spectral frequency (ISF) coefficient of the signal from a linear predictive coding (LPC) coefficient;
- a weighting function determination unit, configured 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;
- and
- a quantization unit configured to quantize the ISF coefficient or the LSF coefficient using the determined weighting function,
- 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 the magnitude of at least one neighboring spectral bin.
A method of quantizing a signal including at least one of a speech signal and an audio signal, the method comprising:
- obtaining a line spectral frequency (LSF) coefficient or an immittance spectral frequency (ISF) coefficient of the signal from a linear predictive coding (LPC) coefficient;
- determining, performed by a processor, a weighting function based on a magnitude of a spectral bin corresponding to a frequency of the ISF coefficient or the LSF coefficient;
- and
- quantizing the ISF coefficient or the LSF coefficient using the determined weighting function,
- 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 the magnitude of at least one neighboring spectral bin.
Dependencies are inferred from the claim text.