Abstract
The purpose of the present invention is to estimate, with a small amount of computation, a linear prediction synthesis filter after conversion of an internal sampling frequency. A linear prediction coefficient conversion device is a device that converts first linear prediction coefficients calculated at a first sampling frequency to second linear prediction coefficients at a second sampling frequency different from the first sampling frequency, which includes a means for calculating, on the real axis of the unit circle, a power spectrum corresponding to the second linear prediction coefficients at the second sampling frequency based on the first linear prediction coefficients or an equivalent parameter, a means for calculating, on the real axis of the unit circle, autocorrelation coefficients from the power spectrum, and a means for converting the autocorrelation coefficients to the second linear prediction coefficients at the second sampling frequency.
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| 4G,3G | 25/01/2022 | ISLD-202201-012 | NTT DOCOMO INC | Yes | Family Member | ||||
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Technologies
Product
Use Cases
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Claim
1. A linear prediction coefficient conversion device that converts first linear prediction coefficients calculated at a first sampling frequency F1 to second linear prediction coefficients at a second sampling frequency F2 (where F1 < F2) different from the first sampling frequency, comprising:a means for calculating, on a real axis of a unit circle, a power spectrum corresponding to the second linear prediction coefficients at the second sampling frequency based on coefficient information being the first linear prediction coefficients or an equivalent parameter different from Line Spectral Pairs (LSP) coefficients, wherein the power spectrum is obtained, using LSP coefficients calculated based on the coefficient information, at points on the real axis corresponding to N1 number of different frequencies, where frequencies are 0 or more and F1 or less, and (N1-1)(F2-F1)/F1 number of power spectrum components corresponding to more than F1 and F2 or less are obtained by extrapolating the power spectrum calculated using the calculated LSP coefficients;a means for calculating, at points on the real axis of the unit circle, autocorrelation coefficients from the power spectrum; and a means for converting the autocorrelation coefficients to the second linear prediction coefficients at the second sampling frequency.
2. A linear prediction coefficient conversion method performed by a device that converts first linear prediction coefficients calculated at a first sampling frequency F1 to second linear prediction coefficients at a second sampling frequency F2 (where F1 < F2) different from the first sampling frequency, comprising: a step of calculating, on a real axis of a unit circle, a power spectrum corresponding to the second linear prediction coefficients at the second sampling frequency based on coefficient information being the first linear prediction coefficients or an equivalent parameter different from Line Spectral Pairs (LSP) coefficients, wherein the power spectrum is obtained, using LSP coefficients calculated based on the coefficient information, at points on the real axis corresponding to N1 number of different frequencies, where frequencies are 0 or more and F1 or less, and (N1-1)(F2-F1)/F1 number of power spectrum components corresponding to more than F 1 and F2 or less are obtained by extrapolating the power spectrum calculated using the calculated LSP coefficients;a step of calculating, at points on the real axis of the unit circle, autocorrelation coefficients from the power spectrum; and a step of converting the autocorrelation coefficients to the second linear prediction coefficients at the second sampling frequency.']
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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.