Analog/digital adaptive line enhancer

Details Analog/digital adaptive line enhancer Analog/digital adaptive line enhancer

1987-03-26

1988-02-16

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

333 18, 364825, H04B 314

Patent

active

047260351

ABSTRACT:
The reference channel, the narrowband channel, and the error feedback channel are all constructed with analog components, while the adaptive processor is constructed with digital components. Unavoidable analog time delays in the narrowband and the error feedback channels are compensated for in the digital adaptive processor. The adaptive line enhancer described herein employs a local oscillator signal which is mixed with the input signal in a reference channel, which is subsequently converted to a digital signal. A digitized reference signal is supplied to an adaptive filter as an input signal. The adjustable weight values of the adaptive filter are adjusted by a feedback digitized signal. The output signal is derived from the subtraction of a narrowband analog signal, which is derived from the adaptive filter. The error feedback signal is split off of the output signal, mixed with the local oscillator signal, and supplied to the weight update mechanisms.

REFERENCES:
patent: 4236224 (1980-11-01), Chang
patent: 4238746 (1980-12-01), McCool et al.
patent: 4266204 (1981-05-01), Jacoby
patent: 4351060 (1982-09-01), Treiber

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