LPC pole encoding using reduced spectral shaping polynomial

Details LPC pole encoding using reduced spectral shaping polynomial LPC pole encoding using reduced spectral shaping polynomial

1982-05-03

1985-08-20

Kemeny, E. S. Matt

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

3645135, G10L 100

Patent

active

045368864

ABSTRACT:
Pole encoding of a linear predictive all-pole model of speech is accomplished by first finding poles up to the number required for good prediction (e.g., ten). These poles are extracted from the LPC predictor polynomial, using, e.g., a slightly modified Bairstow method. Those poles having a sufficiently narrow bandwidth (i.e., those sufficiently near the unit circle) are separately encoded, since these poles generally correspond to perceptually important formants. The remaining poles are lumped together to form a residual polynomial. The residual polynomial is then transformed to produce reflection coefficients, and all reflection coefficients above the first two are discarded. This provides an efficient spectral-shaping polynomial of a reduced degree. Thus, pole encoding is made possible using a reduced and adaptively varied bit rate.

REFERENCES:
patent: 4045616 (1977-08-01), Sloane
patent: 4184049 (1980-01-01), Crochiere et al.
patent: 4340781 (1982-07-01), Ichikawa et al.
patent: 4378469 (1983-03-01), Fette
patent: 4393272 (1983-07-01), Itakura et al.

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