AUTOMATIC IM DISTORTION TEST SELECTOR

摘要

AUTOMATIC IM DISTORTION TEST SELECTOR 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.