Digital coding of speech signals using analysis filtering and sy

Details Digital coding of speech signals using analysis filtering and sy Digital coding of speech signals using analysis filtering and sy

1993-05-07

1996-11-26

MacDonald, Allen R.

395 229, 395 231, 395 232, 395 277, G10L 302, G10L 900, G10L 500, G10L 700

Patent

active

055794335

ABSTRACT:
A digital speech encoder is constructed to include a short term analyzer for forming a set of prediction parameters a(i), corresponding to an input speech signal, and an encoder for producing an excitation signal. The encoder includes a plurality of serially coupled coding blocks, wherein each coding block includes an analysis filter, a sample selection block, and a synthesizer filter. The analysis filter outputs speech signal sample values to the sample selection block, which selects and outputs K.sub.i sample values representing a selected partial excitation signal. The synthesis filter synthesizes a speech signal corresponding to the selected partial excitation signal output by the selection block and outputs a partial excitation synthesis result to an output of the coding block. At the output of each coding block is a subtractor arranged for subtracting a partial excitation synthesis result that is output from the coding block from the speech signal to obtain a difference signal. The difference signal is coupled to the input of an analysis filter of a next serially coupled coding block. A quantizer is also provided for forming the excitation signal in accordance with all of the partial excitation signals generated by the coding blocks.

REFERENCES:
patent: 4932061 (1990-06-01), Kroon et al.
patent: 5086471 (1992-02-01), Tanaka et al.
patent: 5271089 (1993-12-01), Ozawa
patent: 5295224 (1994-03-01), Makamura et al.

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