Apparatus and method determining weighting function for linear prediction coding coefficients quantization
First Claim
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1. An apparatus determining a weighting function, comprising:
- a coefficient conversion unit to convert 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;
a weighting function determination unit to determine a weighting function associated with one of importance of the ISF coefficient and importance of the LSF coefficient; and
a quantization unit to quantize one of the converted ISF coefficient and the converted LSF coefficient using the determined weighting function, and to convert one of the quantized ISF coefficient and the quantized LSF coefficient into a quantized LPC coefficient.
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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.
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Citations
25 Claims
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1. An apparatus determining a weighting function, comprising:
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a coefficient conversion unit to convert 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; a weighting function determination unit to determine a weighting function associated with one of importance of the ISF coefficient and importance of the LSF coefficient; and a quantization unit to quantize one of the converted ISF coefficient and the converted LSF coefficient using the determined weighting function, and to convert one of the quantized ISF coefficient and the quantized LSF coefficient into a quantized LPC coefficient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of determining a weighting function, comprising:
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converting, using at least one processor, 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; determining, by the at least one processor, a weighting function associated with an importance of the LPC coefficient using one of the converted ISF coefficient and the converted LSF coefficient; quantizing, by the at least one processor, using the determined weighting function one of the converted ISF coefficient and the converted LSF coefficient; and converting, by the at least one processor, into a quantized LPC coefficient one of the quantized ISF coefficient and the quantized LSF coefficient. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method, comprising:
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converting, by at least one processor, a linear prediction coding (LPC) coefficient of speech into one of a line spectral frequency coefficient (LSF) and an immitance spectral frequency coefficient (ISF); determining a weighted importance of the LPC coefficient by selecting and quantizing one of the LSF and ISF coefficients, where the weighted importance is based upon a frequency band of the speech, an encoding mode of the speech and spectrum analysis of the speech; and converting the quantized selection into a quantized LPC coefficient. - View Dependent Claims (25)
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Specification