High selectivity radio receiver

Details High selectivity radio receiver High selectivity radio receiver

1976-04-28

1977-08-16

Olms, Douglas W.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

325435, 329146, H04H 500

Patent

active

040427820

ABSTRACT:
A superheterodyne receiver for double sideband signals employing two filters having bandwidths encompassing the carrier and sidebands, and providing equal attenuation of signals at the desired frequency and unequal attenuation of signals at other frequencies. The filters respectively drive a pair of detector circuits which are connected to one another in series, each detector including a transistor biased to the point of collector conduction for efficient detection. The series connected detectors provide audio output signals attenuated by the greater of the attenuations provided by the two filters. The equal attenuation provided at the desired frequency is 6 db or less, and attenuation by one or the other of the filters increases rapidly as the frequency deviates from that of the desired signal. For example, in the disclosed embodiment, attenuation is 30 db at one kHz, and 56db for signals 2kHz from the desired signal. The receiver of the invention is also uniquely suited for employment of digital frequency readout and for reception of stereo radio signals.

REFERENCES:
patent: 2073344 (1937-03-01), Johnson
patent: 3944749 (1976-03-01), Kahn

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