Electronic filter for generating a third harmonic signal

Details Electronic filter for generating a third harmonic signal Electronic filter for generating a third harmonic signal

1980-05-08

1982-04-13

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

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331 76, H04N 9535

Patent

active

043250769

ABSTRACT:
An integratable third harmonic signal generator comprises an amplitude limiting amplifier, a linear amplifier, and a signal combining network. A sinusoidal input signal is coupled to the limiter and linear amplifiers. The limiting amplifier generates a square wave signal containing a first harmonic (fundamental) component at the frequency of the input signal, and higher order odd harmonics including a desired third harmonic frequency. The signal gain of the linear amplifier is set so that the magnitude of the output signal from the linear amplifier is sufficient to cancel with the first harmonic of the square wave output signal from the limiter amplifier, when these output signals are combined in the combining network. A resulting signal developed at the output of the combining network contains the desired third harmonic component, as well as higher order harmonics at acceptably reduced levels relative to the third harmonic component, to the substantial exclusion of the first harmonic component.

REFERENCES:
patent: 2373275 (1945-04-01), Thomas
patent: 2946963 (1960-07-01), Lee
patent: 3060364 (1962-10-01), Holcomb
patent: 4019118 (1977-04-01), Harwood
patent: 4096516 (1978-06-01), Pritchard
"Odd-Order Frequency Multiple Generation Technique" Electronic Letters, Apr. 1976, vol. 12, No. 7, pp. 159-160.

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