Re: Resample MHz signal
- From: MooseFET <kensmith@xxxxxxxxx>
- Date: Sun, 19 Aug 2007 15:29:10 -0700
On Aug 19, 2:40 pm, James Barlow <jamesbar...@xxxxxxxxxxxxx> wrote:
Please excuse me for starting another thread on this topic. My
apologies for not being specific enough the first time. But I did
learn something.
What I am really looking for is external hardware that will allow me
to upload an audio frequency WAV file, such a voice or music, from a
PC and then play it back at 100 times the original sample rate.
The program I am using is CoolEdit, which has a built in tone
generator with modulation and eveloping. It can produce 8, 16 or 32
bit resolution at 12 discrete sample rates between 6000 and 192,000.
The idea is to take advantage of this program's functionality and
user-friendly GUI to produce complex signals above the audio range.
PC software (alone) is not a solution as the resulting bandwidth would
be 2KH-2MHz, and therefore beyond the capablities of a standard
soundcard. DSP-based boxes for musicians are equally unsuitable for
the same reason.
I seem to need a lab-type device, or something I can modify or build
from scratch. Do I have any viable options here?
I have Googled big time and so far found nothing. Signal transposers
would be a great project for an electronics magazine. Think of all the
applications.
I hope my aim is clear enough to attract an expert response.
Basically what you are after is a DAC that can go up to several MHz.
If the record is fairly short an "arbitrary function generator"
may be good.
Signatec makes some PCI DACs IIRC
Dyneng makes some PC104 ones, I think but they aren't likely fast
enough.
If your computer has an ISA slot doing a home made DAC wouldn't be
very hard. You would want to provide a little bit of buffering FIFO
and self clocking. The timing of writes on a PC is quite jittery.
The easy way to build this would be to make the PC into a "box that
does this function." Basically what I am thinking here is that you do
this part in DOS or Linux and basically take over the whole machine
while you do the output.
On DOS machines that aren't laptops, the 18.2Hz interrupt can be taken
over and can be used to transfer bursts of data at a much faster
rate. Laptops and Windows machines are less likely to be able to do
this. For some reason the BIOSes commonly used in laptops leave the
interrupts off for longish times.
Linus may be able to do it. Windows is extremely unlikely. In both
cases you need to be able to get to the code that sends the burst at
regular times.
.
- References:
- Resample MHz signal
- From: James Barlow
- Resample MHz signal
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