Electronic tone ringer with distinctive signaling circuitry

Details Electronic tone ringer with distinctive signaling circuitry Electronic tone ringer with distinctive signaling circuitry

1984-08-23

1986-01-28

Dwyer, James L.

Oscillators

Relaxation oscillators

331111, 331 47, 328133, H04M 100

Patent

active

045673330

ABSTRACT:
An electronic tone ringer provides a distinctive ringing capability through the use of two oscillators which allow selection of four tones and four modulation rates. In determining the type of tone generated, formattable inputs select between frequency shift or amplitude modulation modes or disabling the modulation altogether to generate a single tone. In the frequency shift mode, two fundamental frequencies are generated which are related by a predetermined ratio, the output tone alternating between these two frequencies at one of four selectable modulation rates. In the amplitude modulation mode, a single frequency is switched on and off at the selected modulation rate. All of the tones are produced with a duty cycle appropriate for driving an electromagnetic acoustic transducer.

REFERENCES:
patent: 4292604 (1981-09-01), Embree et al.

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