NASA NTRS · 19700000010
Digital frequency discriminator
Abstract
Frequency discriminator has five integrated circuit chips interconnected to provide a divide function, exclusive OR function, phase shifting, and holding so that a single binary output signal results. The state of the binary signal indicates which one of the two input signals has a lower frequency than the other.
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Reid, W. J.. 1970-05-01. Digital frequency discriminator. https://ntrs.nasa.gov/citations/19700000010
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