A fast frequency discrimination method and fast frequency discriminator

Abstract

The invention discloses a rapid frequency discrimination method and a rapid frequency discriminator. A first timing control signal and a second timing control signal are generated according to a clock pulse signal and a frequency discrimination input signal obtained through a reference input signal through a timing control unit respectively, so that an equivalent timing circuit is controlled to perform first equivalent timing and second equivalent timing respectively, the obtained first equivalent timing duration and second equivalent timing duration are respectively equivalent to the periods of the reference input signal and the frequency discrimination input signal, and frequency comparison between the reference input signal and the frequency discrimination input signal is converted into periodic comparison; therefore, the phase difference between the reference input signal and the frequency discrimination input signal is not required to be considered in a frequency discrimination process, only when the first equivalent timing and second equivalent timing are finished, a frequency discrimination result can be obtained. Therefore, even if the frequency difference between the frequency discrimination input signal and the reference input signal is small and a large inverted initial phase difference exists, the frequency discrimination result can be rapidly obtained, and the frequency discrimination speed is greatly increased.

Description

technical field [0001] The present application relates to the technical field of electronic circuits, in particular to a fast frequency discrimination method and a fast frequency discrimination device. Background technique [0002] A frequency discriminator is a commonly used module in communication electronic circuits, which is used to distinguish the frequency relationship between the frequency discriminator input signal and the reference input signal. The existing frequency discrimination method indirectly discriminates the frequency difference mainly by discriminating the phase difference between the frequency discrimination input signal and the reference input signal. respectively by f in and f REF Indicates the frequency of the frequency discrimination input signal and the reference input signal, Represents the initial phase difference, t represents the frequency discrimination time, then the phase difference between the frequency discrimination input signal and th...

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Problems solved by technology

[0005] In view of this, the purpose of this application is to provide a fast frequency discrimination method and a fast frequency discriminator to solve the problem that the frequency difference between the frequency discrimination input signal and the reference input signal is small and there is a large phase reversal in the existing frequency discrimination method. The problem that the frequency discrimination result cannot be quickly obtained when the initial phase difference

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