Speech quality measurement based on radio link parameters and objective measurement of received speech signals
First Claim
1. A method of estimating the speech quality in a mobile telecommunications network comprising the steps of:
- receiving a set of radio link parameters associated with a received radio signal;
temporarily processing said radio link parameters to generate a set of temporal parameters, wherein said temporal parameters have a higher correlation with said speech quality than said radio link parameters;
processing said received radio signal with an original signal that corresponds to said received radio signal to generate a set of signal processing parameters; and
estimating the speech quality from both said set of temporal parameters and said set of signal processing parameters.
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Abstract
An improved method and system of measuring the perceived speech quality in mobile telecommunications networks is disclosed herein. In an embodiment of the invention, the method uses both radio link parameters and an objective measuring technique performed on received signals to estimate the speech quality perceived by the end-user. A radio link processing stage extracts temporal information from a set of available radio link parameters such as the BER, FER, RxLev, handover statistics, soft information, and speech energy. Concurrently, a speech processing stage is used to process a sequence of original signals and received signals, obtained from the output of a telecommunications system. The signal sequences are processed by an objective measuring technique such as Perceptual Speech Quality Measure (PSQM). The outputs from the radio link processing and speech processing stages are utilized to calculate an estimate for speech quality. Furthermore, a weight may be given to radio link processing and speech processing in accordance with their performance under various conditions such that the overall speech quality is calculated with respect to the best approach.
61 Citations
27 Claims
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1. A method of estimating the speech quality in a mobile telecommunications network comprising the steps of:
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receiving a set of radio link parameters associated with a received radio signal;
temporarily processing said radio link parameters to generate a set of temporal parameters, wherein said temporal parameters have a higher correlation with said speech quality than said radio link parameters;
processing said received radio signal with an original signal that corresponds to said received radio signal to generate a set of signal processing parameters; and
estimating the speech quality from both said set of temporal parameters and said set of signal processing parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
calculating a radio link parameter over an interval having a duration that is selected to provide said higher correlation with said speech quality.
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12. The method of claim 11 wherein said radio link parameter is bit error rate, said interval is 0.5 seconds and said step of calculating further comprises the step of:
determining a mean bit error rate of said received radio signal over 0.5 seconds.
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13. The method of claim 11 wherein said radio link parameter is frame erasures, said interval is 5 seconds and said step of calculating further comprises the step of:
determining a number of frame erasures which occur in said received radio signal over 5 seconds.
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14. The method of claim 11 wherein said radio link parameter is frame erasures, said interval is 3 seconds and said step of calculating further comprises the step of:
determining a mean residual bit error rate of said received radio signal over 3 seconds.
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15. A speech quality measuring system for wireless telecommunication networks that receive a set of radio link parameters associated with a received radio signal comprising:
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a radio link parameter processor for temporally processing said radio link parameters to generate a set of temporal parameters, wherein said temporal parameters have a higher correlation with said speech quality than said radio link parameters;
a signal processor for processing said received radio signal with an original signal that corresponds to said received radio signal to generate a set of signal processing parameters; and
an estimator for estimating speech quality from the output from the radio link parameter processor and the speech signal processor. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification