Adaptive digital equalization filter

Details Adaptive digital equalization filter Adaptive digital equalization filter

1991-04-04

1993-06-08

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

375103, 36472401, H03H 730

Patent

active

052186210

ABSTRACT:
An adaptive digital equalization filter is provided to remedy the differential time delay problem in a digital simulcast system. The digital simulcast system includes an adaptive digital equalization filter with N coefficients, and a fixed analog anti-alias filter. According to the invention, the adaptive digital equalization filter first measures the amount of delay contributed to the output signal by the fixed anti-alias filter. This is accomplished by exciting the anti-alias filter with a unit impulse, and measuring the resulting impulse response. The adaptive filter next determines the characteristics needed to compensate for the amount of measured delay contributed to the output signal by the fixed filter. This is accomplished by computing a new set of N coefficients using the Levinson-Durbin algorithm. The adaptive filter next adjusts its coefficients based on these determined characteristics. Further, the adaptive filter periodically determines when it is time to update the N coefficients.

REFERENCES:
patent: 4333063 (1982-06-01), Ryu et al.
patent: 4361892 (1982-11-01), Martin
patent: 4686686 (1987-08-01), Nakayama et al.

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