Dialing tone generator employing low frequency oscillator

Details Dialing tone generator employing low frequency oscillator Dialing tone generator employing low frequency oscillator

1987-04-02

1988-09-06

Schreyer, Stafford D.

Telephonic communications

Supervisory or control line signaling

Substation originated

379418, H04M 150

Patent

active

047698365

ABSTRACT:
A dialing tone generator employs a low-frequency oscillator as a reference signal oscillator. The reference signal is frequency-divided into first and second frequency-divided signals. The first frequency-divided signal is used to produce a low-frequency tone signal, whereas the second frequency-divided signal is used to produce a high-frequency tone signal. These tone signals are rectangular waveforms. The rectangular waveforms are filtered in corresponding low-pass filters to output first and second sine-wave signals. Then, these sine-wave signals are synthesized with each other to produce a desired dialing tone.

REFERENCES:
patent: 4087638 (1978-05-01), Hayes et al.
patent: 4126768 (1978-11-01), Grenzow
patent: 4563548 (1986-01-01), Misherghi et al.

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