Patent
1975-12-12
1977-09-13
Claffy, Kathleen H.
179 1P, 179 1555R, G10L 100
Patent
active
040484432
ABSTRACT:
A digital speech communication arrangement includes apparatus for partitioning a speech signal into a plurality of nonuniformly related, preassigned intelligibility contributing subbands, and quantized with an accuracy (bit allocation) based upon perceptual criteria. As a result, the quality of the coded signal is improved over that obtained from a single full-band coding of the total spectrum. "Integer-band" sampling may be employed to alias the signal in an advantageous way before coding. Each subband portion is digitally encoded after sampling at a rate related to the bandwidth of the subband. The digital codes of the subband are combined and applied to a common communication channel. A replica of each subband is formed by separating the digital codes, producing a sampled form of each digital coded signal and selecting the subband of the speech signal from said sampled form. The subbands are combined to reconstruct the speech signal. Other features include: aliasing for efficient frequency transposition.
REFERENCES:
patent: 2949505 (1960-08-01), Kretzmer
patent: 3471644 (1969-10-01), Gold et al.
patent: 3952164 (1976-04-01), David et al.
Crochiere Ronald Eldon
Flanagan James Loton
Webber Susan Anne
Bell Telephone Laboratories Incorporated
Claffy Kathleen H.
Cubert J. S.
Kemeny E. S.
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