Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent
1996-08-16
1998-09-15
Bost, Dwayne
Telephonic communications
Supervisory or control line signaling
Signal reception at substation
379373, 379374, 379375, H04M 100
Patent
active
058091319
ABSTRACT:
A ringer circuit which generates a sine wave, where an amplified output of a transistor for oscillation is fed back to a base of the transistor. An output from an output transistors is a sine wave. When this sine wave output is supplied to a circuit for driving a ringer IC, in which the output is rectified and integrated, the current waveform appearing between input terminals of a rectifier is a sine wave, not in a pulse form. Therefore, the fluctuation appearing in the current waveform at the output of an integrator is insignificant, and the average current will increase. As a result, it is possible to drive a ringer IC regardless of a load (value of components in the integrator). Further, it is possible to drive a telephone set with only R and C. A ringing tone with less noise can be generated. Thus, a ringing tone can be generated regardless of the type of telephone set, without increasing the frequency of an oscillation output.
REFERENCES:
patent: 5260996 (1993-11-01), Dillon et al.
patent: 5295185 (1994-03-01), Washio
patent: 5321596 (1994-06-01), Hurst
Dennis Morgan, "Tone-ringer circuit drives telephone-signal counter", Electronic Design, No. 18, Sep. 1984.
Akira Hasegawa, et al., "Desgn know how of switching regulators".
Takashi Kenjo et al., "Practical Guide for Electronic Circuit Design".
Ichikawa Syuzi
Umeda Kazuhiro
Bost Dwayne
Ferguson Keith
Sarah Inc.
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