Carrier signal detection circuit featuring a wide range of signa

Details Carrier signal detection circuit featuring a wide range of signa Carrier signal detection circuit featuring a wide range of signa

1991-04-12

1992-08-18

Kuntz, Curtis

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455260, 455307, H04B 116

Patent

active

051407019

ABSTRACT:
A carrier frequency lock detection circuit receives a baseband signal from a tuning control loop of a receiver. The baseband signal is sent to a comb-filter network which has a plurality of bandpass filters, each receiving a specific sideband frequency. The output power of each filter of the comb-filter network is added up by an adder, filtered by a multiple low-pass filter to reject noise components, and finally converted to a voltage. The thus converted voltage is compared to a preset threshold voltage in order to determine whether the carrier signal has passed through one of the filters of the comb-filter network intended for a sideband, thus indicating that the tuning control loop of the receiver is locked onto a sideband frequency. If such a situation exists, a break-lock indication is sent to the receiver.

REFERENCES:
patent: 4087628 (1978-05-01), Sanders et al.
patent: 4177430 (1979-12-01), Paul
patent: 4761829 (1988-08-01), Lynk, Jr. et al.

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