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Artificial bandwidth extension of wideband speech by pitch-scaling of higher frequencies
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Datum
2013
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Gesellschaft für Informatik e.V.
Zusammenfassung
In this paper, a simple DFT-domain pitch-scaling technique is used to extend the audio bandwidth of wideband speech (50 Hz - 7 kHz) to the super-wideband range (50 Hz - 12 kHz). Therefore, the higher frequencies of the wideband signal (6 - 7 kHz) are pitch-scaled with a scaling factor of four and the resulting, scaled signal is inserted into the 8 - 12 kHz band. A subjective listening test has been conducted wherein it could be shown that the new proposal clearly outperforms a previous method for artificial bandwidth extension which is based on statistical estimation techniques.