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AssigneeDeutsche Telekom AG
InventorJens Berger
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Known methods for determining intensity parameters are based on the evaluation of short signal segments and their direct allocation to speech pauses or speech activity. In order to distinguish speech from speech pauses, intensity thresholds are often used. When the undisturbed source signal is used to mark, speech pauses, a variably occurring time lag between source voice signal and disturbed voice signal often impedes exact transfer of the marking. Intensity parameters of background noises in speech pauses can be determined from the frequency distribution of the intensity values for short signal segments using the method disclosed in the invention. In order to assign intensity values, the fraction of speech pauses in the entire signal is calculated from the undisturbed source signal and defined as frequency threshold. Intensity values below the frequency threshold are assigned to the speech pauses. The arithmetic mean value of said intensity value is determined as intensity parameter for the background noise in the speech pauses. Percentile parameters for background noises in speech pauses can also be calculated with the inventive method.
A method for determining intensity characteristics of background noise during speech pauses of speech signals, the undisturbed source speech signal and the disturbed speech signal of which being available in recorded form, and the proportion of speech pauses in the overall signal being determined from the undisturbed source speech signal according to known methods, and the disturbed speech signal being divided into short successive signal elements, and an intensity value being determined for each signal element.
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