Communications: electrical – Continuously variable indicating – With meter reading
Patent
1993-12-03
1995-10-31
Peng, John K.
Communications: electrical
Continuously variable indicating
With meter reading
3403094, 340326, 340581, 340636, 455343, G08B 522
Patent
active
054633800
ABSTRACT:
A paging receiver having alerting means implemented as a speaker and a light emitting diode (LED). The paging receiver has a decoder for outputting a pair of periodically varying drive signals on determining that a call meant for the receiver has been received, a speaker drive for causing a speaker to sound in the pattern of either one of two drive pattern signals, and an LED driver for turning on the LED in the other pattern. The drive periods of the two drive pattern signals are arranged alternately with each other and such that they do not overlap each other, whereby the luminance of the LED is maintained at a sufficiently high level even when a battery powering the paging receiver reaches the last stage of its service life.
REFERENCES:
patent: 4499453 (1985-02-01), Right
patent: 4704608 (1987-11-01), Sato et al.
patent: 4755816 (1988-07-01), DeLuca
patent: 4868561 (1989-09-01), Davis
patent: 4918438 (1990-04-01), Yamasaki
patent: 4924208 (1990-05-01), Coughlin
patent: 4955080 (1990-09-01), Wagai et al.
patent: 4975693 (1990-12-01), Davis et al.
Hill Andrew
NEC Corporation
Peng John K.
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