Variable bandwidth filtering and frequency converting system

Details Variable bandwidth filtering and frequency converting system Variable bandwidth filtering and frequency converting system

1979-06-29

1981-04-14

Ng, Jin F.

Telecommunications

Transmitter

Angle modulation

455118, 455207, 455266, 455315, H04B 104, H04B 126

Patent

active

042623618

ABSTRACT:
A system which provides frequency conversion and continuously variable bandwidth control uses fixed filters to which opposite edges of the passband of the signal are applied in inverted frequency relationship. A channel contains the filters and three mixers to which injection signals derived from a single variable frequency oscillator and a fixed oscillator are applied to vary the bandwidth of the system without affecting the center frequency of the signal after processing in the system. The system may be designed to obtain either a variable bandpass or rejection band filtering characteristic.

REFERENCES:
patent: 2407212 (1946-09-01), Tunick
patent: 2606285 (1952-08-01), Bataille et al.
patent: 2692332 (1954-10-01), Godbey
patent: 2747084 (1956-05-01), Doelz
patent: 2998517 (1961-08-01), Beckerich
patent: 3008043 (1961-11-01), Caulk

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