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Old 24th April 2005, 03:51 PM   #1
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Default want to build a hd portable recorder.

I would like to build a simple hd recorder, like Edirol R-4
http://www.sweetwater.com/store/detail/R4Edirol/

I just need to can record 2 tracks at time, and total 15 aprox. Want spdif or Aes input at 24/96 khz.
Basic transport funtions, start, stop, record, foward..
I have the hd, would be difficult? what about the cost?
Thanks.
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Old 24th April 2005, 05:40 PM   #2
gmarsh is offline gmarsh  Canada
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Personally, i'd buy a used laptop off ebay and a USB/PCMCIA soundcard which is capable of recording 24/96 digital audio.

Building a portable recorder that resembles the device you linked is possible, but not easy and certainly not cheap.
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Old 24th April 2005, 06:14 PM   #3
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I have had a laptop and souncard. I need something hard. Just one unit. Quick start, no sofware, just push a pair of buttons to can record.
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Old 24th April 2005, 06:20 PM   #4
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Well, you will need to go surface mount to get the electronics small and robust enough, and learn a lot of coding to write some custom software to drive the HD and interfaces.

I would just get one S/H from ebay or similar, unless you have a couple of years to spare!
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Old 24th April 2005, 06:32 PM   #5
gmarsh is offline gmarsh  Canada
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You can probably do it as follows:

AES/SPDIF inputs -> SC939-06 transformer (sorry Jocko) -> CS8414 -> Microchip dsPIC w/codec interface -> hard drive. You'll also need the appropriate power management stuff (+5V/+12V supplies, battery charging, etc) to make a true 'portable' application.

My only worry is that the HD won't be fast enough - you'll need a FIFO in the dsPIC which is big enough to not overflow when you're waiting for the HD to finish a write, and the dsPIC doesn't have a whole lot of memory. An external SRAM could hopefully take care of this.
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Old 24th April 2005, 09:08 PM   #6
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Gmarsh, is difficult to do this? What about writing the codec sofware? and what about the price aproximatly?
The Edirol r-4 costs around 1500 $.
The building of my own recorder would must be cheaper and not "two years work" of course. Let me know.
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Old 24th April 2005, 09:13 PM   #7
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I wonder if you could hack an iPod?
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Old 24th April 2005, 10:31 PM   #8
gmarsh is offline gmarsh  Canada
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Quote:
Originally posted by lagoausente
Gmarsh, is difficult to do this? What about writing the codec sofware? and what about the price aproximatly?
The Edirol r-4 costs around 1500 $.
The building of my own recorder would must be cheaper and not "two years work" of course. Let me know.
The price? hard to say. You could probably put all the required chips and passives on a PCB for ~$100-ish. Then you're paying for the hard drive, enclosure, batteries, etc...

You'll have to design the schematic and PCB, write the dsPIC software for writing to the HD in the "right places" (not overwriting existing files) - which involves writing it in assembly code unless you want to buy a C compiler for the dsPIC... build it, verify it works (again, i'm not sure if the dsPIC has enough RAM to buffer a stream to the hard drive)... possibly build another board from scratch using a 'proper' DSP chip if that didn't work... the list goes on.

It's not an easy "throw chips together" project like a basic DAC...

Quote:
Originally posted by pinkmouse
I wonder if you could hack an iPod?
The iRiver IHP-120 already supports optical SPDIF recording... I have my doubts it's 24/96 capable though.
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Old 25th April 2005, 02:37 PM   #9
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I think the iRiver does not allow multitrack recording.

What´s C compiler?
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Old 25th April 2005, 03:23 PM   #10
gmarsh is offline gmarsh  Canada
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Quote:
Originally posted by lagoausente
I think the iRiver does not allow multitrack recording.

What´s C compiler?
Have you ever programmed in the C language? If you haven't, you probably should not undertake this project.

A C compiler takes C code and produces machine code which a processor can run.
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