Communications: electrical – Audible indication – Ultrasonic pest control
Patent
1990-01-08
1991-08-13
Crossland, Donnie L.
Communications: electrical
Audible indication
Ultrasonic pest control
340384E, 340467, 340661, 340691, 34087009, 34087021, 340753, 340754, 340767, G08B 300, G09G 320
Patent
active
050399780
ABSTRACT:
An apparatus and method for using an output device such as an LED to show the approximate analog level of a variable electrical signal wherein a modulating AC waveform is superimposed either on the signal or a reference voltage, both of which are then fed to a comparator which drives the output device. Said device flashes at a constant perceptible rate with a duty cycle which varies in response to variations in the level of the input signal. The human eye perceives these variations in duty cycle as analogous to variations in the level of the input signal.
REFERENCES:
patent: 3846749 (1974-11-01), Curry
patent: 3964302 (1976-06-01), Gordon et al.
patent: 4083042 (1978-04-01), Kushin et al.
patent: 4155084 (1979-05-01), Klees
patent: 4231013 (1980-10-01), Freeman et al.
patent: 4348666 (1982-09-01), Ogita
patent: 4357594 (1982-11-01), Ehrlich et al.
patent: 4688029 (1987-08-01), Kawasaki et al.
Crossland Donnie L.
Dixon Harol M.
Hamel Stephen D.
Moser William R.
LandOfFree
Analog graphic display method and apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Analog graphic display method and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Analog graphic display method and apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1530505