Hello audio chums! I'm interested in building a device that would be incredibly useful but which doesn't seem to be readily available anywhere. I wonder if anyone may be able to help? I have very little electronics knowledge so I'd be grateful first of all for any guidance on how realistic I'm being...
I require a signal delay device that can get down to the microsecond range, for the purpose of phase aligning microphones. There are a few devices on the market which will allow you to delay a signal to the ms, but none that go down to μs. Ideally I'd love something that would allow both; say with one dial for ms and another for μs.
This doesn't seem like a big ask, but I'm finding such a device shockingly unavailable. Does anyone have any thoughts?
The most likely reason you can't find a device in the microsecond range is that most audio delay devices are digital. There is a finite delay in processing analog into digital and I would suggest that the processing delay is the limiting factor for how short of a delay you can achieve. That's not to say it's not possible to go faster with the fastest converters or even new designs with emerging or future technologies but without a substantial market demand, there would be no incentive to produce such a device.
There are alignment plugins like MAutoAlign which might help. Not sure about their resolution. This seems to bring up a good point about where analog has best use and where digital processing might be better for certain things.
Yeah, I realise that this could be more effectively carried out in my DAW, however I'd like to align the signals prior to recording in order to treat two mics on a guitar amp as one signal, which has various advantages for me.
I recently made a documentary about Steve Albini's drum recording technique, and in it he mentions an Eventide delay device that he uses to add a few ms of delay to room mics. Here's a screenshot:
On investigation it appears that Eventide made this device specially for Steve and have no intention of rolling it out commercially. I've just discovered that it was made from a couple of DDL500s, so it's a digital device. You can see that it fits the bill perfectly. My question is -- how is it possible to get my hands on something like this? My only hope seems to be to have someone clever build me something...
Post by Michael Lawrence on May 19, 2020 13:20:38 GMT
You can find some old Peavey IDL1000 delay lines on ebay for less than $100 each. I have some in my basement. They run at 48 kHz so you can get a delay increment down to 20 uS. They are line level so you will want to put them post-preamp.