Electronic wristwatch having dialing tone generator

Details Electronic wristwatch having dialing tone generator Electronic wristwatch having dialing tone generator

1988-04-21

1989-09-05

Schreyer, Stafford D.

Telephonic communications

Composite substation or terminal

379361, 379418, H04M 150, H04M 1100

Patent

active

048646040

ABSTRACT:
A wristwatch equipped with 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 being used to produce a low-frequency tone signal, the second frequency-divided signal being used to produce a high-frequency tone signal. Both these tone signals are rectangular waveforms which are filtered in corresponding low-pass filters, to output first and second sine-wave signals, which are then 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.
patent: 4573046 (1986-02-01), Pinnow
patent: 4727570 (1988-02-01), Tarbouriech
patent: 4763355 (1988-08-01), Cox

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