Off-hook signal and dial pulse generating circuit and a method f

Details Off-hook signal and dial pulse generating circuit and a method f Off-hook signal and dial pulse generating circuit and a method f

1997-09-25

1999-08-10

Kuntz, Curtis A.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Of data transmission

379 27, 379 31, 379399, H04M 124, H04M 308, H04M 322

Patent

active

059370300

ABSTRACT:
An off-hook signal and dial pulse generating circuit which has a smaller number of switching devices having a high withstand current characteristic and has a less surge voltage than up to now. A dial pulse circuit and a switch block circuit are connected in parallel with the output side of a full-wave rectifying circuit. The circuit comprises an impedance circuit and a first switch circuit to be turned on/off by a signal. The impedance circuit operates in a state where it has an inductance component in case that a signal synchronized with a signal is off and operates in a state where it has no inductance in case that the signal is on, and an electric current flowing therethrough is turned on/off by the first switch circuit. The circuit comprises a series circuit composed of second and third switch circuits. The second switch circuit is turned on/off in response to a signal synchronized with the signal (where this circuit is off when the signal is on). The third switch circuit is turned on/off in response to the signal.

REFERENCES:
patent: 5652575 (1997-07-01), Pryor et al.
patent: 5768341 (1998-06-01), Pryor et al.
Toshio Hayasaka et al., "Type 600 Telephone Set" Jul. 1964, pp. 129-133.

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