Speech signal decoding apparatus and method therefor

Details Speech signal decoding apparatus and method therefor Speech signal decoding apparatus and method therefor

1994-07-05

1996-12-03

MacDonald, Allen R.

395 215, 395 235, 395 236, 395 237, 395 238, 395 239, G10L 302, G10L 900

Patent

active

055816517

ABSTRACT:
A speech signal decoding apparatus includes a decoding section, an error check section, a data memory, a white noise generating section, a switch group, and a frequency region synthesizing filter bank. The decoding section separates a received code string into the 0th to nth sub-band signals and decodes them. The data memory outputs the decoded signals with a delay. The white noise generating section outputs white noise signals of the (m+1)th to nth sub-bands which are level-adjusted in accordance with the average power of the decoded signal of each sub-band. The switch group selects/outputs the decoded signals of the 0th to nth sub-bands when a control signal representing an error is not output, and selects/outputs the delayed and decoded signals of the 0th to mth sub-bands and the level-adjusted white noise signals of the (m+1)th to nth sub-bands when a control signal representing an error is output. The frequency region synthesizing filter bank outputs a reproduced speech signal on the basis of the selected outputs of the 0th to nth sub-bands. A speech signal decoding method is also disclosed.

REFERENCES:
patent: 4216354 (1980-08-01), Esteban et al.
patent: 4790015 (1988-12-01), Callens et al.
patent: 4831624 (1989-05-01), McLaughlin et al.
patent: 5150387 (1992-09-01), Yoshikawa et al.
patent: 5384793 (1995-01-01), Zinser
patent: 5471558 (1995-11-01), Tsutsui

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