Method and apparatus for tuning analog filters

Details Method and apparatus for tuning analog filters Method and apparatus for tuning analog filters

1997-09-30

2000-01-11

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

With particular receiver circuit

455266, 333 171, H04B 116

Patent

active

060145544

ABSTRACT:
A method and apparatus for tuning an analog filter that is embodied in a larger circuit in which the analog input signal to the filter is, at some point prior to the filter, in digital form. The digital version of the input signal to the filter is stored in memory. The output signal from the filter corresponding to the stored input signal is digitized and compared to the stored digital input signal to the filter. Based on the known input signal and the known desired frequency characteristics of the filter, the desired output signal is a known quantity. If the actual output signal differs from the expected output signal, the filter is tuned accordingly. The process may be performed continually on all input data or on discrete sections of the input data.

REFERENCES:
patent: 4207531 (1980-06-01), Ito
patent: 4453258 (1984-06-01), Richardson
patent: 5281931 (1994-01-01), Bailey et al.
patent: 5448769 (1995-09-01), Jantti
patent: 5612975 (1997-03-01), Becker et al.
patent: 5625316 (1997-04-01), Chambers et al.
patent: 5822687 (1998-10-01), Bickley et al.
patent: 5845200 (1998-12-01), Suzuki et al.

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