H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/79
H04B 1/16 (2006.01) H04L 7/02 (2006.01) H04L 27/152 (2006.01)
Patent
CA 2035785
An autocorrelator for FSK signals. An FSK signal, incoming an a telephone line is filtered by a bandpass filter (13) and sampled by an A/D converter (14). A sample clock (15) provides a fixed sampling frequency, FS. A first interpolating filter (20B) provides selectable delays which are non-integer multiples of 1/FS, and an integer delay (25) provides selectable delays which are integer multiples of 1/FS. The delayed signals are multiplied by a multiplier (26) and then filtered by a low pass filter (27) to provide a filtered autocorrelated signal. A second interpolating filter (20A) provides for reduced jitter in the band timing by increasing the number of samples provided to the decision logic (23). The decision logic (23) provides the decoded data output.
Finlayson & Singlehurst
Hayes Microcomputer Products Inc.
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