32,157 research outputs found
Digital frequency discriminator
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
Electronic frequency discriminator
Digital comparator permits discrimination at accuracy of reference frequency. The compare circuit is a shift register element
Digital frequency discriminator Patent
Describing frequency discriminator using digital logic circuits and supplying single binary output signa
The genus spectrum of a hyperbolic 3-manifold
In this article we study the spectrum of totally geodesic surfaces of a
finite volume hyperbolic 3-manifold. We show that for arithmetic hyperbolic
3-manifolds that contain a totally geodesic surface, this spectrum determines
the commensurability class. In addition, we show that any finite volume
hyperbolic 3-manifold has many pairs of non-isometric finite covers with
identical spectra. Forgetting multiplicities, we can also construct pairs where
the volume ratio is unbounded
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