High-quality reception indicating circuit for scanning AM reciev

Details High-quality reception indicating circuit for scanning AM reciev High-quality reception indicating circuit for scanning AM reciev

1994-06-13

1996-09-10

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4552001, 455229, 4552341, H04B 126

Patent

active

055554512

ABSTRACT:
The reception quality of an AM broadcast signal is determined within a very short time of tuning to the channel frequency by modifying the intermediate frequency signal to remove the audio information modulated on the carrier but including residual noise and higher frequencies. The modified IF signal is used to regenerate a pure sine-wave carrier as a replica of the original carrier wave at the transmitter. This pure carrier is compared to the modified IF signal to identify degradation during transmission.

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S. Arisawa, M. Nakagawa & I. Sasase; 1983; P 25.4.1-25.4.5; "Improvement of Signal-to-Noise Ratio by Nonlinear Cancellation in the Presence of Large. . .".

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