Method and apparatus for measuring the quality of digital signals
US4951282A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 22, 1988 |
| Grant date | Aug 21, 1990 |
| Priority date | — |
| Expiry date | Aug 22, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R29/033
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A PROM has inupts from error detecting and processing equipment of the signal reproducing channels of equipment reproducing digital signals from magnetic tape and can be controlled to process selectively the recognition of errors and of their respective natures by the error detecting and correcting circuits. The error detection circuits also provide a block end signal at the end of every block of data of the digital signal being processed which is protected against errors by check words. At every block end signal the output of the PROM is transferred to a first register, the contents of which are made available to an adder for adding these contents to the contents of the second register (10) and the output of the adder is written into the second register, either without change or after division by two by a switch (12), to the output of the second register. A third register controls the extent counting of a counter (13) which counts out a set number of block end signals before putting the switch for one interval into its division by two position and at substantially the same time transferring the contents of the third register to other equipment which may be used to adjust the count…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.