Electronic signal processing system
First Claim
1. An electronic signal processing system for an alternating voltage input signal comprising a phase-locked loop network having an input adapted to receive said signal and produce an intermediate signal comprising a substantially noise free sine wave with a phase equal to the average phase of said input signal, said intermediate signal being applied to an input of a variable gain amplifier which, for any particular value of gain, produces an output signal proportional to said intermediate signal, and an amplitude averaging loop network having said input signal and said output signal as its inputs which produces a biasing signal which is applied to a control input of said variable gain amplifier to maintain said output signal equal in amplitude to the average amplitude of said input signal.
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Abstract
Disclosed is an electronic signal processing system for an alternating voltage input signal. A phase-locked loop network has an input adapted to receive the signal and produce an intermediate signal comprising a substantially noise free sine wave with a phase equal to the average phase of the input signal. The intermediate signal is applied to an input of a variable gain amplifier which produces an output signal proportional to the intermediate signal, and an amplitude averaging loop network has the input signal and the output signal as its inputs and produces a biasing signal which is applied to a control input of the variable gain amplifier to maintain the output signal equal in amplitude to the average amplitude of said input signal. The system can be used in a Watson-Watt type radio direction finder to eliminate noise.
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7 Claims
- 1. An electronic signal processing system for an alternating voltage input signal comprising a phase-locked loop network having an input adapted to receive said signal and produce an intermediate signal comprising a substantially noise free sine wave with a phase equal to the average phase of said input signal, said intermediate signal being applied to an input of a variable gain amplifier which, for any particular value of gain, produces an output signal proportional to said intermediate signal, and an amplitude averaging loop network having said input signal and said output signal as its inputs which produces a biasing signal which is applied to a control input of said variable gain amplifier to maintain said output signal equal in amplitude to the average amplitude of said input signal.
Specification