Method and apparatus for distorting a speech signal

Details Method and apparatus for distorting a speech signal Method and apparatus for distorting a speech signal

H - Electricity

04

K

325/3

H04K 1/04 (2006.01)

Patent

CA 1210817

ABSTRACT OF THE DISCLOSURE A method of scrambling a speech signal by rearranging and/or reversing frequency bands in this signal is described. The speech signal is divided into a plurality of sub-bands by filtering, and the sub-bands are individually sampled at a sampling frequency which is at least double that of the sub-band bandwidth, to provide a plurality of first spectra, each with periodic repetition of the respective sub-band. Alternating samples are polarity-reversed for providing a plurality of second spectra each with periodic repetition of the respective sub-band in reversed form. From one of these two types of spectrum a desired sub-band is then filtered out, which corresponds to the original sub-band, but is reversed and/or displaced in the frequency band as desired. All the obtained sub-bands are finally added to form the scrambled signal.

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