Shielded twisted-pair, usually designed for low current, high flexibilityĪnd low handling noise. (typically less than 150 feet) use plastic fibers, while long distances Glass fibers to convey light and modulated information. A constant-impedance unbalanced transmissionĭata cable See data cables and Category cables. Surrounded with a heavy layer of insulation, covered by a thick surroundingĬopper shield and jacket.
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Types of cables (for all the details see Lampen): Technologies for the automation of homes and buildings in North America. Clarity ratings a logarithmic measure of the early-to-late arrival sound energy ratio for music the constant is 80 ms (C 80) and for speech it is 50 ms (C 50).īuildings Association) An industry association that promotes advanced In general, I'd reverse the priority of Greg's "rules" 2 and 3.C 50 (dB) C 80 (dB) Intelligibility. But there's no reason to worry about a few feet of difference either. There's certainly no harm in using equal cable lengths, assuming that they are reasonable lengths of quality cable. The latency in most digital gear today is much, much larger than any delay that could be caused by varying your clock cable lengths. If you move a microphone back by one millimeter in your studio, you've added more signal delay than you would with a half a mile of wordclock cable. Look at it this way: Electricity travels about a million times faster than sound. But as long as all of your gear has a constant, jitter-free clock, the tiny delay between them isn't a factor. The bottom line is that the two pieces of equipment have a tiny delay between them. But in reality, while the delay of a few extra feet of cable is real, it is a nearly constant delay, which makes it pretty harmless. The basis for using equal length wordclock cables is that it keeps your data synchronized as it moves through your studio. Opinions vary on what level of jitter is audible. Jitter is generally measured in picoseconds, so typical jitter specs are well under one nanosecond. At 96KHz, audio samples are taken about every 10,000 nanoseconds. For the gear that's connected to the master clock, will longer digital audio cables, or varying cable length, also have a negative effect on jitter?Īt the speed of light, one foot of wire equates to about 1 nanosecond of travel time. In the case of the machines that are placed very close together, what can I do with the extra length of word cable? Can I coil it or figure-8 it, or do I just have to send it around somewhere and back? Oh well, some day I'll have something I can call a "studio." (You know what they say about Japanese apartments? Well, it's true!) (If it seems funny that the lack of space prevents me from having shorter cables, it's because I have to spread the gear out too much, in order to have room to walk). Damn, this place is so small! Everytime I buy something, I end up building or re-building shelves to get it in. I've been racking my head (now maybe that's one that I should put in for worst pun of the year!) trying to figure out a way to set things up to get shorter cable length, but even at best, it will have to be 2 metres.
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3 meters is a little long but I don't think you will have any problems.
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I've arranged my studio so that my clock cables are all 1 meter. But rule 3 is definitely secondary to rule 2. The reason for rule 3 is that you want the signal to be as clean and strong as possible. However, jitter itself is usually measured in pico seconds and as the whole point of adding a masterclock is to reduce jitter, it's definitely worth keeping the cable lengths the same.
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Obviously the amount of time the signal takes to travel the extra two and a half meters at the speed of light is tiny, probably only measurable in pico seconds. All cables should be a short as possible.Įxplanation: If you've got a word clock cable coming out of you Lucid that's 50cm long and then another that 3 meters long, the piece of equipment that's getting it's clock from the 50cm cable is going to get its clock signal fractionally earlier than the piece of equipment getting it's signal from the 3 meter cable. Use good quality 75ohm impedence cable.ģ. There are only three rules for word clock cables from a masterclock:ġ.