Patent
1980-09-26
1983-02-15
Kemeny, Emanuel S.
G10L 100
Patent
active
043743048
ABSTRACT:
In a speech communication system, an input speech signal is partitioned into a plurality of subband portions. Responsive to each subband portion, a signal of lesser bandwidth representative of the subband portion is generated by dividing the instantaneous phase of the subband by an integer k. Where k=2, for example, the center frequency and bandwidth of each subband is halved. The lesser bandwidth subband portion representative signals are combined to form a compressed bandwidth signal representative of the input speech signal. A replica of the input speech signal is formed by partitioning the compressed bandwidth signal into subband portions thereof; converting each compressed signal subband portion into a signal representative of a subband of the input speech signal; and combining the converted subband representative signals into a single speech signal replica.
REFERENCES:
patent: 3349184 (1967-10-01), Morgan
patent: 3360610 (1967-12-01), Flanagan
patent: 3484556 (1969-12-01), Flanagan et al.
patent: 3510597 (1970-05-01), Williamson
patent: 3541266 (1970-11-01), Klayman
patent: 4086431 (1978-04-01), Franssen et al.
Bogner et al, "Frequency Multiplication of Speech Signals", IEEE Trans. on Audio, Sep. 1969, pp. 202-208.
Bell Telephone Laboratories Incorporated
Cubert Jack S.
Kemeny Emanuel S.
Olsen Kurt C.
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