Automatic IM distortion test selector
US4344029A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 1981 |
| Grant date | Aug 10, 1982 |
| Priority date | — |
| Expiry date | May 11, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R23/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.