Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1990-09-14
1992-09-22
Williams, Howard L.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341166, H03M 160
Patent
active
051501210
ABSTRACT:
A voltage-to-frequency converter provides an output signal, the frequency of which is proportional to the instantaneous level of a reference-frequency signal, which is proportional to the output signal of a parameter-sensing circuit. An up-down frequency counter counts the output pulses of the voltage-to-frequency converter. An up-down control terminal coupled to the reference-frequency signal switches the counting direction of the up-down counter to demodulate the output signal of the voltage-to-frequency converter and to provide a digital output signal representative of the time integral of the amplitude of the parameter being sensed.
An undersired input signal is reduced by subtracting a cancellation signal having the format of the undesired signal from the undesired input signal. The filter includes a subtractor, or difference circuit, the output of which is coupled to a voltage-to-frequency converter. A feedback path is provided between the output terminal of the voltage-to-frequency converter and one input terminal of the difference circuit. The feedback path includes a circuit for selectively converting the frequency output signal representing the undesired input signal to a cancellation signal. The circuit for selectively converting includes a synchronous carrier signal generator and a reversible up-down counter.
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Bhardwaj Pradeep
Newell Gerald R.
New SD Inc.
Williams Howard L.
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