The DS1/1C/2/3 mentioned on the front panel is to do with T1 networks (an AT&T digital network over leased lines for long-haul pcm modulated voice comms), so this is a specialized unit for testing to do with that - nothing to do with audio as such, a digital signal quality tool - T1 is mentioned in this document I found when searching for DS1/1C/2/3
https://www.dcbnet.com/notes/9611t1.html
https://www.dcbnet.com/notes/9611t1.html
Thanks Mark, I went to electronics school in the pre-digital 70s. No wonder I didn't know what it is. I didn't think it was audio related though.
It's a jitter generator, it adds jitter to a digital signal either internally or from an external clock source.
These are used to jitter a digital signal so you can check how the receiving or decoding equipment reacts (or not) to the jitter.
Jan
These are used to jitter a digital signal so you can check how the receiving or decoding equipment reacts (or not) to the jitter.
Jan
Yes error flags. How would you count jitter anyway?
There were two flags: error correction and error concealment.
Routinely, the error correction flag would flash thousands of time on a single play, indicating read errors that were 100% repaired.
It was also routine that you could play hundreds of CDs without the error concealment flag, indicating unrepairable errors, flash even once.
Jan
There were two flags: error correction and error concealment.
Routinely, the error correction flag would flash thousands of time on a single play, indicating read errors that were 100% repaired.
It was also routine that you could play hundreds of CDs without the error concealment flag, indicating unrepairable errors, flash even once.
Jan
They are often used to test telecom equipment. They may be combined with a BER (bit error rate) measuring device as well. I used one in my career a few times. Jitter can degrade BER.