Speech signal coding using correlation valves between subframes

Details Speech signal coding using correlation valves between subframes Speech signal coding using correlation valves between subframes

1992-02-26

1995-06-20

MacDonald, Allen R.

395 229, 395 23, G10L 900

Patent

active

054267188

ABSTRACT:
A speech signal coding system for coding a speech signal at a bit rate of 8 to 4 kb/s wherein the amount of calculation for fractional search of delays of an adaptive codebook is reduced significantly. Before a fractional delay of the adaptive codebook is found, candidates of integer delay are found by an open-loop using correlation values. A search for a fractional delay by a closed loop is performed for a search range for fractional delays which is provided by .+-.several samples of each integer delay candidate thus found using the correlation values. The fractional delay search is realized by polyphase filtering of an excitation signal in the past. In the search, a plurality of candidates of fractional delay may be found for each integer delay candidate from the adaptive codebook. In this instance, a fractional delay is determined decisively from the decimal delay candidates after a search of an excitation codebook.

REFERENCES:
patent: 4736428 (1988-04-01), Deprettere et al.
patent: 4932061 (1990-06-01), Kroon et al.
patent: 5097508 (1992-03-01), Valenzuela Steude et al.
patent: 5138661 (1992-08-01), Zinser et al.

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