Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent
1997-03-05
2000-03-28
Isen, Forester W.
Telephonic communications
Supervisory or control line signaling
Using line or loop condition detection
379382, 379413, H04M 322
Patent
active
060441496
ABSTRACT:
A self-contained signaling and control device for detecting DTMF tones and generating a signal, such as an audible, visual, or control signal, upon detection of one or more predetermined DTMF tones includes an on/off-hook detection circuit coupled to a telephone line; a power supply circuit coupled to the on/off-hook detection circuit; a DTMF receiver circuit coupled to the power supply circuit; a logic circuit coupled to the DTMF receiver circuit; and a signal generator coupled to the logic circuit and the power supply circuit. The on/off hook detector circuit for detecting changes in voltage across a telephone line includes a circuit for detecting a voltage on the telephone line and a circuit for generating an enable signal in response to rapid changes in the voltage on the telephone line. The on/off hook detector circuit does not generate an enable signal in response to slow changes in the voltage on the telephone line.
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Operational Amplifiers/Buffers LM101/LM102,.
Shaham Amos
Shaham Israel
Isen Forester W.
Saint-Surin Jacques M.
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