Method and system for speech quality prediction of an audio transmission system
First Claim
1. A method for measuring the transmission quality of an audio transmission system, an input signal (X) being entered into the system, resulting in an output signal (Y), in which both the input signal (X) and the output signal (Y) are processed, comprising the steps of:
- preprocessing of the input signal (X) and output signal (Y) to obtain pitch power densities (PPXWIRSS(ƒ
)n, PPYWIRSS(ƒ
)n) for the respective signals;
compensating the pitch power densities for linear frequency response and time varying gain so as to obtain compensated pitch power densities (PPX″
WIRSS(ƒ
)n, PPY′
WIRSS(ƒ
)n), wherein the compensation of linear frequency response and time varying gain comprises an iterative loop having at least three compensation calculations, the calculations having a calculation of a first partial compensation of a first type, a calculation of a compensation of a second type, and a calculation of a second partial compensation of the first type, the first type of calculation and the second type of calculation comprising a different one of a calculation of compensation of linear frequency response and a calculation of a local power scaling factor; and
computing, in response to compensated pitch power densities (PPX″
WIRSS(ƒ
)n, PPY′
WIRSS(ƒ
)n), a score (Q) indicative of transmission quality of the system.
1 Assignment
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Accused Products
Abstract
Method and system for measuring the transmission quality of an audio transmission system (10). Preprocessing means (12) are present for preprocessing of an input signal (X) and an output signal (Y) to obtain pitch power densities (PPXwIKss(j)” 1′PYwrR.ss(fin) for the respective signals. Compensation means (13, 14) are provided for compensation of linear frequency response and time varying gain. Calculation means (13, 14) are present for calculation of loudness densities (LX(I)n, LY(fi,) from the compensated pitch power densities, and computation means (15, 16) are provided for computation of a score (Q) indicative of the transmission quality of the system (10) from the loudness densities. The compensation means (13, 14) comprise an iterative loop having at least three calculations of compensations, each calculation comprising one of a calculation of a compensation of linear frequency response and a calculation of a local power scaling factor.
22 Citations
15 Claims
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1. A method for measuring the transmission quality of an audio transmission system, an input signal (X) being entered into the system, resulting in an output signal (Y), in which both the input signal (X) and the output signal (Y) are processed, comprising the steps of:
-
preprocessing of the input signal (X) and output signal (Y) to obtain pitch power densities (PPXWIRSS(ƒ
)n, PPYWIRSS(ƒ
)n) for the respective signals;compensating the pitch power densities for linear frequency response and time varying gain so as to obtain compensated pitch power densities (PPX″
WIRSS(ƒ
)n, PPY′
WIRSS(ƒ
)n), wherein the compensation of linear frequency response and time varying gain comprises an iterative loop having at least three compensation calculations, the calculations having a calculation of a first partial compensation of a first type, a calculation of a compensation of a second type, and a calculation of a second partial compensation of the first type, the first type of calculation and the second type of calculation comprising a different one of a calculation of compensation of linear frequency response and a calculation of a local power scaling factor; andcomputing, in response to compensated pitch power densities (PPX″
WIRSS(ƒ
)n, PPY′
WIRSS(ƒ
)n), a score (Q) indicative of transmission quality of the system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for measuring the transmission quality of an audio transmission system, an input signal (X) being entered into the system, resulting in an output signal (Y), comprising:
-
means for preprocessing of the input signal (X) and output signal (Y) to obtain pitch power densities (PPXWIRSS(ƒ
)n, PPYWIRSS(ƒ
)n) for the respective signals;means, responsive to the pitch power densities, for compensating linear frequency response and time varying gain so as to obtain compensated pitch power densities (PPX″
WIRSS(ƒ
)n, PPY′
WIRSS(ƒ
)n), wherein the compensation comprises an iterative loop having at least three compensation calculations, the calculations having a first partial compensation of a first type, a calculation of a compensation of a second type, and a calculation of a second partial compensation of the first type, the first type of calculation and the second type of calculation comprising a different one of a calculation of compensation of linear frequency response and a calculation of a local power scaling factor; andmeans, responsive to from the compensated pitch power densities densities (PPX″
WIRSS(ƒ
)n, PPY′
WlRSS(ƒ
)n), for computing a score (Q) indicative of transmission quality of the system. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification
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- Resources
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Current AssigneeKoninklijke KPN NV
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Original AssigneeKoninklijke KPN NV
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InventorsBeerends, John Gerard, Van Den Homberg, Marc Jan Christiaan
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Primary Examiner(s)Abebe, Daniel
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Application NumberUS10/549,003Publication NumberTime in Patent Office1,398 DaysField of Search379/1.03, 704/200US Class Current704/200CPC Class CodesG10L 25/69 for evaluating synthetic or...
