Reduced codebook search arrangement for CELP vocoders

Details Reduced codebook search arrangement for CELP vocoders Reduced codebook search arrangement for CELP vocoders

1991-05-31

1992-12-22

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 31, 381 35, G10L 500

Patent

active

051739410

ABSTRACT:
A new way of CELP coding speech simplifies the recursive loop used to poll code adaptive book vectors by reducing the number of autocorrelation operations that must be performed with the K vectors of the codebook each having N entries. Autocorrelation is initially performed for only a small number P<<N autocorrelation coefficients in each codebook vector and the values found are used to scan through all the codebook vectors looking for those S vectors (S<K) which give the best match to the input speech. The autocorrelation function for the S vectors is then recalculated for R entries (P<R.ltoreq.N) in the codebook vectors to determine which of the S codebook vectors and associated gain gives the best match to the input speech.

REFERENCES:
patent: 4868867 (1989-09-01), Davidson
patent: 4907276 (1990-03-01), Aldersberg

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