Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1987-03-26
1988-10-11
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340573, 340407, 340531, 34082519, 379 38, 379 52, 381 42, 381 60, 381 68, 381 231, G08B 108
Patent
active
047774746
ABSTRACT:
The present invention is an alarm for the hearing impaired. A base station includes alarm receiving circuits for receipt of alarm signals. These alarm signals could be a telephone ringing signal, a smoke/fire alarm, a doorbell signal or the like. Upon detection of one of these alarms, a radio transmitter transmits a signal to a portable unit. The portable unit includes all parts of an ordinary hearing aid together with a radio receiver to receive the signal transmitted by the base station. In a first embodiment, the base station includes a tone generator or voice signal generator which generates a unique signal dependent upon the alarm received for modulation of the transmitted signal. The portable unit includes a demodulator for recovery of the original signal. Thus the unse can determine the type of alarm from the audio signal received. In a second embodiment, a tone generator in the portable unit is enabled by the transmitted signal from the base station.
REFERENCES:
patent: 3183509 (1965-05-01), Ellett
patent: 3925763 (1975-12-01), Wadhwani et al.
patent: 3984803 (1976-10-01), Hawk et al.
patent: 4297677 (1981-10-01), Lewis et al.
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