Speech codec

Details Speech codec Speech codec

1993-03-15

1996-01-30

MacDonald, Allen R.

395 23, 395 231, 395 22, 395 2, G10L 914

Patent

active

054887046

ABSTRACT:
A speech codec includes a drive sound source generating circuit in which, in a case of a voiced sound speech, a pulse pattern signal corresponding to a pitch-scale, drive sound source signals stored within a newest predetermined past time period and a noise signal are multiplied by predetermined gains, respectively, and then, added to each other so as to generate a drive voiced sound source and, in a case of an unvoiced sound, drive sound source signals stored within a newest predetermined past time period and a noise signal are multiplied by predetermined gains, respectively, and then, added to each other so as to generate a drive unvoiced sound source.

REFERENCES:
patent: 4667340 (1987-05-01), Arjmand et al.
patent: 5293449 (1994-03-01), Tzeng
patent: 5307441 (1994-04-01), Tzeng

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