Fast pitch tracking process for LTP-based speech coders

Details Fast pitch tracking process for LTP-based speech coders Fast pitch tracking process for LTP-based speech coders

1990-04-06

1992-03-03

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 49, G10L 500

Patent

active

050938630

ABSTRACT:
A process for deriving voice pitch related delay values M to tune a Long-Term Prediction (LTP) filter to be used in an LTP based speech coder converting a speech derived digital signal r(n) into a lower bit rate signal, said filter being provided with a variable length delay line y(n) fed with a reconstructed signal r'(n). The process includes splitting r(n) into segments and each segment into sub-segments; then cross-correlating the first current r(n) sub-segment with a previously reconstructed segment and sorting the cross-correlation values for peak location, whereby a first delay value M1 is derived and used to tune the filter. Then, said M1 is used to compute sample indexes n for a predefined number of samples located about M1/p, . . . , M1, 2M1, . . . , pM1 and repeating cross-correlation and sorting operations to derive M2 and so on up to a full segment length (e.g. 160 samples). Then the process is started all over again.

REFERENCES:
patent: 5001758 (1991-03-01), Galand et al.
patent: 5012517 (1991-04-01), Wilson et al.

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