Frequency error detection methods and systems using the same

Telephonic communications – Supervisory or control line signaling – Signal receiver

Reexamination Certificate

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C379S282000, C379S283000

Reexamination Certificate

active

06850616

ABSTRACT:
A method of detecting frequency errors exceeding a predetermined limit in a sampled signal includes the step of determining a peak amplitude of the signal at a tone frequency for a first frame of samples of the sampled signals using a filter having a first amplitude versus frequency response. A peak amplitude of signal at the tone frequency is determined for a second frame of samples of the sampled signal using a filter having a second amplitude versus frequency response. A ratio between the peak amplitude of the first frame and the peak amplitude of the second frame is calculated and compared against a threshold to detect frequency errors exceeding the predetermined limit. Among other things, this method decouples the frequency error detection problem from the twist factor estimation problem.

REFERENCES:
patent: 5187721 (1993-02-01), Wong
patent: 5619564 (1997-04-01), Canniff et al.
patent: 5734577 (1998-03-01), Chesir et al.
patent: 5765125 (1998-06-01), Dougherty et al.
patent: 5809133 (1998-09-01), Bartkowiak et al.
patent: 6236724 (2001-05-01), Labaton et al.

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