Speech signal bandwidth compression and expansion apparatus, and

Details Speech signal bandwidth compression and expansion apparatus, and Speech signal bandwidth compression and expansion apparatus, and

1994-12-06

1996-11-26

MacDonald, Allen R.

G01L 302

Patent

active

055794343

ABSTRACT:
A speech signal bandwidth compression and expansion apparatus and its method. On the transmitting side, system parameters are extracted from a speech signal by a linear prediction analyzer. A prediction residual signal is obtained by inverse filtering processing by using the system parameters. The prediction residual signal is lowered in sampling rate by a down-sampler and converted to a baseband signal. From the baseband signal, a time series signal is derived by a linear prediction synthesizer. Thereafter, the time series signal is converted to an analog signal and transmitted. On the receiving side, a received signal is subjected to inverse filtering processing to reproduce a baseband signal. The sampling rate of the reproduced baseband signal is raised to derive a time series signal. From the time series signal, a high frequency band component is generated. The high frequency band component is added to the baseband signal to generate an excitation signal. From the excitation signal, the original speech signal is reproduced by a linear prediction synthesizer.

REFERENCES:
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patent: 5001758 (1991-03-01), Galand et al.
patent: 5060269 (1991-10-01), Zinser
Nguyen et al., "Correcting Spectral Envelope Shifts in Linear Predictive Speech Compression Systems", IEEE Milcom '90: A New Era, pp. 354-358, 1990.
"Residual-excited linear prediction vocoder with spectral flattener utilizing (LI-RELP)" Trans. of IEICE, vol. J68-A, No. 5, pp. 489-495, May 1985.
"The residual-excited linear prediction vocoder with transmission rate below 9.6 kbits/s", IEEE Trans. vol. COM-23, No. 12, Dec. 1975, pp. 1466-1474.
"Computer speech processing", Electronic Science series, Sanpo Publishing, Jun. 10, 1980, pp. 43-50.

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