Auto-tuned frequency discriminator

Details Auto-tuned frequency discriminator Auto-tuned frequency discriminator

1981-10-23

1984-05-29

Heyman, John S.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329103, 329136, 329168, 455214, H03D 102, H03D 118, H03D 120

Patent

active

044517920

ABSTRACT:
An integrable auto-tuned frequency discriminator is provided having a feedback circuit to tune the discriminator when an input signal having a reference frequency is applied at the input of the frequency discriminator. The input signal is multiplied by a delayed version thereof which is provided by a delay filter. The length of delay is varied by altering the transfer function of the delay filter in response to delay filter control inputs. The discriminator output is coupled to a feedback circuit which generates the control input signals, thereby tuning the delay filter to provide a discriminator output reference level. A control input to the feedback circuit provides the capability to tune the delay filter to a carrier frequency which is offset from the reference frequency. A gate input to the feedback circuit disables the feedback input after the frequency discriminator has been tuned.

REFERENCES:
patent: 4054840 (1977-10-01), Sato
patent: 4127825 (1978-11-01), Blomley
patent: 4388595 (1983-06-01), Brooks

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