Multi channel scanning receiver with improved signal strength de

Details Multi channel scanning receiver with improved signal strength de Multi channel scanning receiver with improved signal strength de

1989-10-26

1993-03-30

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4551613, 4551651, 4551681, 455222, H04B 116

Patent

active

051991098

ABSTRACT:
A scanning radio is provided having a plurality of the following elements: 1. a circuit to develop an output representative of the noise power contained in a demodulated signal at a present time; 2. a circuit to delay the output of (1) thereby generating an output representative of the noise power contained in the demodulated signal at a past time; 3. a comparison circuit to compare the output of (2) with the output of (1) to develop an output indicating decreasing noise power and therefore improving signal quality; 4. a comparison circuit to compare the output of (2) with the output of (1) to develop an output indicating increasing noise power and therefore degrading signal quality; 5. a comparison circuit to compare the output of (1) with a reference level to develop an output indicating noise power above/below a threshold and therefore signal strength below/above a corresponding threshold; 6. control processor responsive to outputs (3), (4), and (5) to control local oscillator generator; 7. control processor responsive to outputs (3) and (4) to control local oscillator generator.

REFERENCES:
patent: 4430753 (1984-02-01), Shiratani
patent: 4521915 (1985-06-01), Baker et al.
patent: 4731868 (1988-03-01), Dreier
patent: 4742568 (1988-05-01), Furuya
patent: 4876743 (1989-10-01), Lindenmeier et al.
patent: 4947456 (1990-08-01), Atkinson et al.
patent: 4989263 (1991-01-01), Suzuki
patent: 5027431 (1991-06-01), Tanaka et al.
patent: 5077834 (1991-12-01), Andros et al.

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