Communications: electrical – Continuously variable indicating – With meter reading
Patent
1991-07-22
1995-08-01
Peng, John K.
Communications: electrical
Continuously variable indicating
With meter reading
34082557, 329312, 375340, 327 31, G08C 1900
Patent
active
054383285
ABSTRACT:
A circuit for measuring a pulse width of a remote control signal comprises a receiver for receiving a remote control signal exhibiting at least one pulse; an amplifier for shaping and amplifying the received remote control signal to produce a corresponding output signal; a counter having an output which changes from first to second logic states in response to reception of a falling edge of a first pulse of the output signal and simultaneously making a first count of clock pulses that is cleared at the falling edge of each pulse of the output signal; and a microprocessor. When the value of the first count reaches a first predetermined value equivalent to an output signal pulse period and a selected delay, the output changes back to the first logic state. The selected delay is set longer than the period of each pulse so that the first count does not reach the first predetermined value before arrival of another pulse within a waveform of the output signal. A logic gate provides the clock pulses to the counter only when the counter obtains the second logic state. The microprocessor generates the clock pulses and a second count of the clock pulses starting at the falling edge of the first pulse of the output signal, stores a value of the second count when the counter output changes back to the second logic state, and measures the remote control signal waveform width by subtracting the selected delay from the second count.
REFERENCES:
patent: 4486752 (1984-12-01), Chihak
patent: 4617677 (1986-10-01), Chiba
patent: 4623886 (1986-11-01), Welles
patent: 4692710 (1987-09-01), Shvortsman
patent: 4763341 (1988-08-01), Murphy
patent: 4897857 (1990-01-01), Wakatsuki et al.
patent: 5313199 (1994-05-01), Kwon
Bushnell Robert E.
Hill Andrew
Peng John K.
Samsung Electronics Co,. Ltd.
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