Abstract A telephone for a physically handicapped person has a transducer which is selected for easy actuation by the handicapped person. The transducer may, for example, be operated orally. When the transducer is first operated, a switch under the control of the transducer causes the telephone line switch to go "off hook" and, after a suitable delay, causes outpulsing of a zero signal to alert the operator. Once contact with the operator is established, the caller who has access to a telephone microphone, asks the operator to place the call and subsequently participates in it. Following the termination of the call, the transducer is operated again to reactuate the line switch and return the telephone set to its "on hook" condition. A similar procedure is followed when a call is received by the handicapped person. However, in this case, since no zero dialling is required, ringing voltage on the line is detected and, while present, zero dialling in response to transducer actuation is prevented.
Inventors
👤 Lech S. Zielinski
👤 Conrad Lafrance
👤 Jacek J. Wojcik
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-25 15:53
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/247; H04M1/2474
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A call sequence control circuit for use in a telephone system for use by a physically handicapped person comprising: a transducer; a controller under the control of the transducer operable to make and break an electrical connection between a telephone speech circuit and a telephone line; signal generating means under the control of the controller for generating an alerting signal and for transmitting the signal to the telephone line; detector means for detecting ringing voltage on the telephone line; and inhibiting means under the control of the detector means for preventing transmission of said alerting signal while ringing voltage is being detected by the detector means.
Claim 2
Dependent Claim
106 words
A call sequence control circuit for use in a telephone system for use by a physically handicapped person comprising: a transducer; a controller under the control of the transducer operable to make and break an electrical connection between a telephone speech circuit and a telephone line; signal generating means under the control of the controller for generating an alerting signal and for transmitting the signal to the telephone line; detector means for detecting ringing voltage on the telephone line; and inhibiting means under the control of the detector means for preventing transmission of said alerting signal while ringing voltage is being detected by the detector means.