Automatic IM distortion test selector

Details Automatic IM distortion test selector Automatic IM distortion test selector

1981-05-11

1982-08-10

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 2700

Patent

active

043440290

ABSTRACT:
An intermodulation test analyzer which automatically determines whether an SMPTE or CCIF intermodulation test is being conducted and switches its output accordingly is disclosed. This is accomplished by sensing the low frequency energy content of the test signal. This energy content is compared to a reference level representative of the low frequency energy content of a typical SMPTE test signal. Therefore, if the low frequency energy content of the input signal is greater than the reference level, the signal is treated as the SMPTE test signal. However, if the low frequency energy content is less than the reference level, the signal is processed as a CCIF test signal.

REFERENCES:
patent: 2607007 (1952-08-01), Clark
patent: 2767373 (1956-10-01), Maggio
patent: 2970258 (1961-01-01), Sinclair
patent: 3777256 (1973-12-01), Harrison
patent: 3962645 (1976-06-01), Stewart
Hiscocks, DISTORTION Some Simple Ways to Measure It, Audio Scene Canada, Jul. 1974, pp. 18-21.

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