Method and apparatus for implementing a bandlimited ringing...

Details Method and apparatus for implementing a bandlimited ringing... Method and apparatus for implementing a bandlimited ringing...

2005-12-06

2005-12-06

Tran, Sinh (Department: 2644)

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

C379S413000, C379S413010

Reexamination Certificate

active

06973178

ABSTRACT:
Method and apparatus for generating a bandlimited square waveform for use as a ringing voltage in a telephone network is described. One embodiment comprises a method of generating a ringing voltage signal for transmission to a telephone device. The method comprises calculating a truncated Fourier series representation of a square wave using only low order harmonic frequencies thereof; determining a sampling rate; generating digital sample data using the truncated Fourier series representation and the sampling rate; and converting the digital sample data to an analog signal.

REFERENCES:
patent: 4192007 (1980-03-01), Becker
patent: 5325060 (1994-06-01), Mansfield et al.

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