Looking for 5-10second audio delay line (300Hz - 15Khz bandwidth)

On a sunny day (Sun, 17 Jan 2010 20:12:34 +0000) it happened David Chapman wrote in :

PC, or PC motherboard for embedded, with 2 soundcards, some software.

What quality do you need?

Does that mean you want something that just handles *speech*? (15KHz is considerably higher than that -- yet the 300 and 15K numbers suggest you aren't looking for high end audio kit (?)

It's a trivial design -- depending on what sort of quality you want in the signal, how "adjustable" you want it to be, how you want it to behave "in transition", etc.

Do you have specific size, power, quality, reliability, cost, etc. requirements? Or, will you settle for "anything that gets the job done"?

AFAIK these can be bought as standard devices. Did you google for audio delay line?

The days of the old Bucket Brigades..

One simple way is to use a loop of tape with a tape recorder; record on one head and playback on another.

Another way is to make your own artificial transmission line.

Eventide have several products that include this. Check out

Cheers

ian

Do radio stations use a tape loop or a "drum"? Seems a tape loop would soon wear out. ...Jim Thompson

Are radio stations still analog tese days?

A delay in the digital world is just a big FIFO. All it takes is enough memory and a couple of pointers.

They did, back in the '60s, and yes, they wore out in under a week. the heads only lasted a few months to a year, depending on whether they were cleaned every eight hours, or daily.

It is not quite so simple if you need a delay with the resolution of a fraction of a sample.

Vladimir Vassilevsky DSP and Mixed Signal Design Consultant

Sure it is. Just grab more samples. Memory is cheap.

or

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=A0 =A0 ...Jim Thompson

=A0 =A0| =A0 =A0mens =A0 =A0 |

=A0 | =A0 =A0 et =A0 =A0 =A0|

=A0|

=A0 =A0 =A0 |

no they haven't used tape for years...

the digital boxes are slick

when someone says something nasty on a call in show..they press the kill button, instead of having to fill the dead air, the more sophisticated digital delay boxes just jump ahead a few seconds and then gradually build up the delay again so the listener never evens knows that the kill button was needed...

Mark

The tape head wears out long before the tape itself (observed fact).

..point with my digit (finger)..

Many thanks to all those who had something useful to offer in response to my posting.

I'm looking for something that is single channel (Mono.) entirely non-mechanical, and able to operate from cold completely stand-alone, probably with 24-bit resolution and at least 48KHz sampling rate.

I can't risk anything using analogue boards in a standard PC running a custom program that needs to be booted up manually and is then liable to 'crash' at the most awkward times.

I've followed up some of the suggestions made, done some more Google searching, and at the moment I rather like the capabilities (but not the price) of this device which works in association with a dedicated controller:

I'll keep looking in case I can find a cheaper solution. Thanks again to those people who took the trouble to respond.

- Dave

On a sunny day (Tue, 19 Jan 2010 09:26:42 +0000) it happened David Chapman wrote in :

It does not *have* to run MS windows. And it is easy to add a startup script in Linux.