Radio scanner and display system

Details Radio scanner and display system Radio scanner and display system

1993-02-05

1998-11-24

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4551542, 4551584, 4551585, 4551922, 4552264, H04B 116

Patent

active

058421190

ABSTRACT:
A method is described for operating a radio receiver in such manner as to accurately and rapidly identify unlistenable, very listenable and marginally listenable channels, and display the listenable and very listenable channels along with an indication of their signal strength, noise and quality on a screen. A reference value of automatic fine tuning voltage is found for the particular receiver. Capacitors that are charged in accordance with the levels of signal strength, noise and automatic fine tuning voltages are sampled before being fully charged at each channel change, and averages of the respective samples are computed as well as the offset between the average of the automatic fine tuning samples and the reference value of automatic fine tuning voltage. A channel having sample averages not meeting certain criteria is rejected as unlistenable, and, of the others, a channel having a very low average on its noise capacitor is identified as very listenable. Those of the remaining channels that are at least marginally listenable are identified by similar analysis of a second group of samples. The criteria for signal strengths and noise may be varied with ambient temperature, and the criteria for noise can be adjusted on the basis of the noisiest channel or the noise produced when the antenna is grounded. Those channels having the greatest signal strength are associated with tuning buttons, and indications of these associations are made on the screen.

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