Method for detecting a tone signal through digital signal...

Details Method for detecting a tone signal through digital signal... Method for detecting a tone signal through digital signal...

2006-03-28

2006-03-28

Vo, Nguyen T. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

C455S221000, C375S350000

Reexamination Certificate

active

07020448

ABSTRACT:
A method for detecting a tone signal having a predetermined tone frequency includes receiving an analog communication signal, using a sampling frequency to convert the analog communication signal into a digital communication signal, selecting a plurality of signal sectors corresponding to a predetermined frequency range of the digital communication signal where the predetermined tone frequency agrees with the predetermined frequency range, and using the number of samples of each signal sector to determine whether the analog communication signal contains the tone signal.

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patent: 2002/0161775 (2002-10-01), Lasensky et al.
patent: 2003/0081667 (2003-05-01), Camnitz et al.

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