Linear prediction speech coding with high-frequency preemphasis

Details Linear prediction speech coding with high-frequency preemphasis Linear prediction speech coding with high-frequency preemphasis

1991-09-26

1994-03-15

Knepper, David D.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Combined cathode ray tube and circuit element structure

395 228, 395 229, G10L 302, H04B 166

Patent

active

052952240

ABSTRACT:
High frequency components of input digital speech samples are emphasized by a preemphasis filter (11). From the preemphasized samples a spectral parameter (a.sub.i) is derived at frame intervals. The input digital samples are weighted by a weighting filter (13) according to a characteristic that is inverse to the characteristic of the preemphasis filter (11) and is a function of the spectral parameter (a.sub.i). A codebook (18, 19) is searched for an optimum fricative value in response to a pitch parameter that is derived by an adaptive codebook (16) from a previous fricative value (v(n)) and a difference between the weighted speech samples and synthesized speech samples which are, in turn, derived from past pitch parameters and optimum fricative values, whereby the difference is reduced to a minimum. Index signals representing the spectral parameter, pitch parameter and optimum fricative value are multiplexed into a single data stream.

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