Multi-pulse type coding system

Details Multi-pulse type coding system Multi-pulse type coding system

G - Physics

10

L

354/47

G10L 9/14 (1990.01)

Patent

CA 1336841

A multi-pulse type coding system in which an update period of LPC parameters for searching multi-pulses (excitation pulses) is shortened. The multi-pulse type coding system of the present invention includes an LPC analyzer for producing LPC parameters indicative of spectral envelope of a speech signal for each search frame period. An interpolator for producing inter- polated LPC parameters during the search frame period in response to the LPC parameters, is also included. A filtering processor for calculating correlation between the speech signal and an impulse response signal associated with the LPC parameters by filtering the speech signal in accordance with the interpolated parameters forms part of the system. Finally, the system also includes a multi-pulse calculator for calculating multi-pulses in response to-the correlation. The invention provides a multi- pulse type coding system which is capable of keeping a practically sufficient quality even when a lower bit rate, e.g., a bit rate less than 8 Kb/s, is applied for coding.

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