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Speech Signal Processor Using Comb Filter, Time Compression and Expansion of Speech

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An improved speech signal processor uses shift registers capable of control for frequency transformation of the input signal. A pair of complementary comb filters are provided for filtering out those frequencies which would produce disruptive discontinuities due to sampling and subsequent reassembling their samples. This method provides a simple and economical solution to the problems of improving qualities of time compressed and expanded speeches.

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AES - Audio Engineering Society