Spectrum converter for analog signals

Details Spectrum converter for analog signals Spectrum converter for analog signals

1980-04-28

1982-01-19

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 17, 370 18, 371 56, H04L 300

Patent

active

043120733

ABSTRACT:
A device for receiving analog and discrete input signals and for converting the spectrum thereof without loss of information. The resultant signal has a frequency response curve which exhibits zero points at the frequency zero and at half the sample frequency. The second zero point is then suitable for addition of a pilot tone, without the required bandwidth being increased and without interference with the data signal. The device comprises two integrating feedback loops (32, 24/40), the output signals of which are alternately activated. The sign of the active output signal determines the sign of the input signal of the feedback loops and of the output signal of the device. One feedback loop directly receives said output signal, while the other feedback loop receives this output signal via a multiplier which alternately receives a positive and a negative multiplicand.

REFERENCES:
patent: 3230310 (1966-01-01), Brogle
patent: 3641327 (1972-02-01), Nelson, Jr.
patent: 3697874 (1972-10-01), Kaneko
patent: 3902117 (1975-08-01), Sheppard
patent: 3938082 (1976-02-01), Schowe

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