Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1988-02-03
1989-09-05
Kemeny, Emanuel S.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 51, 3645135, G10L 500
Patent
active
048646202
ABSTRACT:
Pre-recorded speech is played back at a different rate, without pitch change. Adjacent signal segments are combined with best match processing. Method and apparatus process time domain speech signals containing speech information, the rate of reproduction of which is to be varied without changing pitch, wherein the input signal is processed by capturing input time domain speech samples in frames wherein the number of samples per frame is a function of a desired speech change factor, forming blocks from the frames, additively cross correlating input blocks with prior-processed or output blocks, preferably by means of an Average Magnitude Difference Function, to obtain a time relation of best match for the rate of reproduction, adding consecutive input and output blocks at the point of maximum correlation, and applying a window function between the overlapping portions of the output block and the input block to obtain a new output block. The method does not require multiplication or division. Relatively smooth transitions between superimposed segments of speech which become output blocks are realized by applying a graduated weighting.
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Makhoul, John and El-Jaroudi, Amro, "Time-Scale Modification in Medium to Low Rate Speech Coding", pp. 1705-1708.
Kemeny Emanuel S.
The DSP Group Inc.
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