Communications: electrical – Digital comparator systems
Patent
1976-05-28
1978-01-03
Yusko, Donald J.
Communications: electrical
Digital comparator systems
340210, 340249, 325392, H04Q 910, H04B 1100, G08B 2100
Patent
active
040670007
ABSTRACT:
A battery powered ultrasonic remote control transmitter for controlling various functions associated with a television receiver, or the like, includes an arrangement for providing an audible indication that the battery voltage has fallen below a desired operating level. In one embodiment, when the battery voltage has fallen below the desired level, the electrical control signal for at least one control function is selectively amplitude modulated by an audio frequency signal before being coupled to the ultrasonic transducer. As a result, when the control function is selected, an operator is given an audible indication that the battery needs recharging or replacement.
REFERENCES:
patent: 3879717 (1975-04-01), Gruensfelder
patent: 3909722 (1975-09-01), Bennett, Jr.
patent: 3967258 (1976-06-01), Bucy, Jr.
patent: 3987414 (1976-10-01), Tuma
Emanuel Peter M.
RCA Corporation
Schaefer Kenneth R.
Whitacre Eugene M.
Yusko Donald J.
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