Electrical wave filter

Details Electrical wave filter Electrical wave filter

1975-01-14

1976-08-03

Smith, Alfred E.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

333 20, 333 70R, H04B 1500, H03K 504, H03H 702

Patent

active

039732100

ABSTRACT:
A selective wave filter that employs a frequency selective circuit that provides a waveform that represents the envelope of an input tone burst, such as a dot or dash used in radio telegraphy. The output of the frequency selective circuit is connected to a rectifier and the output of the rectifier is connected to a filter that removes most of the audio components and allows the resultant pulse to pass to an output circuit. The output circuit employs apparatus in the form of a balanced modulator, voltage controlled amplifier or the like.

REFERENCES:
patent: 2220260 (1940-11-01), Meier
patent: 2532450 (1950-12-01), Hings
patent: 2606972 (1952-08-01), Scott
patent: 2937273 (1960-05-01), Franco
patent: 3846719 (1974-11-01), Dolby

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