Encoder capable of removing interaction between adjacent frames

Details Encoder capable of removing interaction between adjacent frames Encoder capable of removing interaction between adjacent frames

G - Physics

10

L

354/141, 354/47,

G10L 11/00 (2006.01)

Patent

CA 1230682

Abstract of the Disclosure: In an encoder for encoding an input signal (AA) into a sequence of excitation pulses (GG) with reference to an autocorrelation signal (DD) and a cross-correlation signal (CC) derived from the input signal, a cross-correla- tion controller (40) controls the cross-correlation signal in response to the autocorrelation signal and the excitation pulse sequence by producing a control signal (HH). Both of the cross-correlation and the autocorrelation signals are concerned with a current frame of the input signal and a part of the following frame. The control signal appears in the following frame to be subtracted from the cross-correlation signal in a subtractor (31) and to modify the cross-correlation signal into an adjusted cross-correlation signal (EE). Although the adjusted cross-correlation signal lasts for the current frame and the part of the following frame, an excitation pulse generator (32) produces the excitation pulses only within the current frame.

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