Sub-band speech analyzing and synthesizing device

Details Sub-band speech analyzing and synthesizing device Sub-band speech analyzing and synthesizing device

1987-09-23

1989-09-19

Shoop, Jr., William M.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 36, G10L 702

Patent

active

048688681

ABSTRACT:
In a sub-band speech analyzing and synthesizing apparatus, a low-pass filter comprises a nonrecursive filter. The center frequency and bandwidth of each channel are selected so that the decimated sampling period of that channel is an integer multiple of the period of the modulating signal or the demodulating signal of the channel. Modulation or demodulation is performed simultaneously with the low-pass filtering by the nonrecursive filter.

REFERENCES:
patent: 4064363 (1977-12-01), Malm
patent: 4086431 (1978-04-01), Franssen et al.
Crochiere et al., "Optimum FIR Digital Filter Implementations for Decimation, Interpolation, and Narrow-Band Filtering," IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-23, pp. 444-454, Oct. 1975.
Crochiere et al., "Further Considerations In The Design Of Decimators and Interpolators," IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSP-24, No. 4, Aug. 1976, pp. 269-311.
The Bell System Technical Journal, vol. 55, No. 8, Oct. 1976, pp. 1069-1085, "Digital Coding of Speech in Sub-bands" R. E. Crochiere et al.

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