Mapping objective voice quality metrics to a MOS domain for field measurements
First Claim
1. A method for estimating the subjective quality of a speech signal transmitted through a wireless network, said method comprising the step of:
- analyzing the speech signal using an objective voice quality method; and
mapping a score output from the objective voice quality method into a mean opinion score (MOS) domain using a logistic function that has the form;
y=1+4/(1+exp(−
1.7244*x+5.0187))where x=the score from said objective voice quality method which is in the range of −
0.5 to 4.5;
y=the mapped score that is in the MOS domain which is in the range of 1 to 5;
wherein y provides a mapped score of the analyzed speech signal, thereby providing an estimate of the subjective quality of the speech signal.
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Abstract
A processing unit and method are described herein that are capable of estimating a quality of a speech signal transmitted through a wireless network. The processing unit uses a logistic function to map a score output from an objective voice quality method (PESQ algorithm) into a mean of opinion (MOS) score which is an estimation of the quality of the speech signal that was transmitted through the wireless network. The logistic function has the form: y=1+4/(1+exp(−1.7244*x+5.0187)) where x is the score from the PESQ algoritm which is in the range of −0.5 to 4.5 and y is the mapped MOS score which is in the range of 1 to 5 wherein if y=5 then the quality of the speech signal is considered excellent and if y=1 then the quality of the speech signal is considered bad.
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Citations
21 Claims
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1. A method for estimating the subjective quality of a speech signal transmitted through a wireless network, said method comprising the step of:
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analyzing the speech signal using an objective voice quality method; and mapping a score output from the objective voice quality method into a mean opinion score (MOS) domain using a logistic function that has the form;
y=1+4/(1+exp(−
1.7244*x+5.0187))where x=the score from said objective voice quality method which is in the range of −
0.5 to 4.5;y=the mapped score that is in the MOS domain which is in the range of 1 to 5; wherein y provides a mapped score of the analyzed speech signal, thereby providing an estimate of the subjective quality of the speech signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A processing unit for estimating a quality of a speech signal transmitted through a wireless network by analyzing the speech signal using an objective voice quality method and mapping a score output from the objective voice quality method into a mean opinion score (MOS) domain using a logistic function that has the form:
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y=1+4/(1+exp(−
1.7244*x+5.0187))where x=the score from said objective voice quality method which is in the range of −
0.5 to 4.5;y=the mapped score that is in the MOS domain which is in the range of 1 to 5 wherein y provides a mapped score of the analyzed speech signal for the processing unit, the processing unit being adapted for use in a computer, thereby providing an estimate of the subjective quality of the speech signal. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for estimating a voice quality of a wireless network comprising the steps of:
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receiving a degraded speech signal that was transmitted through the wireless network; using an objective voice quality method and a logistic function to compare the degraded speech signal with a reference speech signal and output an estimated mean opinion score (MOS) which is an indication of the subjective quality of the degraded speech signal which in turn is an indication of the voice quality of the wireless network; wherein said objective voice quality method outputs a score in the range of −
0.5 to 4.5 which is converted into the estimated MOS which is in the range of 1.0 to 5.0 by the logistic function that has the form;
y=1+4/(1+exp(−
1.7244*x+5.0187))where x=the score from said objective voice quality method; y=the estimated MOS; wherein y provides a mapped score of the analyzed speech signal, thereby providing an estimate of the subjective quality of the speech signal. - View Dependent Claims (14, 15, 16, 17)
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18. A measurement device for estimating a voice quality of a wireless network comprising:
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a receiving unit for receiving a degraded speech signal that was transmitted through the wireless network; a processing unit that uses an objective voice quality method and a logistic function to compare the degraded speech signal with a reference speech signal and output an estimated mean opinion score (MOS) which is an indication of the subjective quality of the degraded speech signal which in turn is an indication of the voice quality of the wireless network; and wherein said objective voice quality method outputs a score in the range of −
0.5 to 4.5 which is converted into the estimated MOS which is in the range of 1.0 to 5.0 by the logistic function that has the form;
y=1+4/(1+exp(−
1.7244*x+5.0187))where x=the score from said objective voice quality metric; y=the estimated MOS; wherein y provides a mapped score of the analyzed speech signal, thereby providing an estimate of the subjective quality of the speech signal. - View Dependent Claims (19, 20, 21)
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Specification