Delta-coded lag information for use in a speech coder

Details Delta-coded lag information for use in a speech coder Delta-coded lag information for use in a speech coder

1991-09-05

1993-10-12

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

381 31, H04B 1406

Patent

active

052532690

ABSTRACT:
Lag information for use in a speech coder is developed by estimating lag values for the various subframes (201) of a speech coding frame (200) of information, and by then selecting lag values for each subframe that are both closely corresponding to the estimated lag values and that also observe the restrictions of a selected delta-coding routine. When a plurality of candidate sets of such information have been developed, they are compared against one another to identify that set which appears to provide the best set of lag values. This information is then available for framing and transmission. In one embodiment, the sets of candidate values are also selected to ensure provision for subsequent adjustment in either a positive or negative direction. With this adjustability capability so provided, closed-loop adjustments can be made with respect to the selected values to ensure that the ultimately transmitted coding for the lag value most closely corresponds to an ultimate output that most closely represents the speech signal to be represented.

REFERENCES:
patent: 4831636 (1989-05-01), Taniguchi et al.
patent: 4933957 (1990-06-01), Bottau et al.
"Vector Sum Excited Linear Prediction (VSELP) Speech Coding at 8 KBPS" Ira A. Gerson and Mark A. Jasiuk 1990 IEEE pp. 461-464.

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