Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1989-06-23
1991-10-08
Shaw, Dale M.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 30, 381 36, 381 41, G10L 918, G10L 504
Patent
active
050561430
ABSTRACT:
A speech processing system such as a variable frame length type vocoder and a pattern matching vocoder of the same type capable of improving the reproduced speech. Representative frames replacing a plurality of frames in a given section are developed from among the frames in the given frame, or the frames in the given frame and the final representative frame developed in the preceding section. First frames to be replaced by the representative frames, and second frames, located between the neighboring different representative frames, which are to be approximated by interpolation between the neighboring different representative frames, are determined under the condition the lengths of the first and second frames be variable. In the pattern matching vocoder, the representative frames are compared with reference pattern frames and the most similar reference pattern frame is selected on the basis of measure which is obtained by summing a time distortion and a quantum distortion caused by the replacement of the frames with the representative frame and the reference pattern frame.
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Knepper David D.
NEC Corporation
Shaw Dale M.
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