Topic: Raspberry Pi Bit Bucket Project

[jerryfreak]

its 2014 and we still dont have a reliable, cheap simple bit bucket.

time to take the bull by the horns

http://www.element14.com/community/community/raspberry-pi/raspberry-pi-accessories/wolfson_pi/blog/2014/03/14/can-you-hear-the-wolfson-calling-setting-up-and-using-the-wolfson-audio-card

im just starting to look at this but seems the community has already mastered the tech we need.

im thinking super simple interface with auto-boot scripts to select sample rate

im a total raspberry pi newb so i have no idea how ti works. hardware support seems solid we just need someone good with linux who can dial in a kernel for our purposes, and potentially down the road an optional ui to make it more user-friendly

i say we keep it simple and go for spdif in/out only and maybe headphone monitoring. we dont need another pcm-m10

I started a  thread about it over there:

http://www.element14.com/community/thread/32886/l/simple-spdif-recorder

the alsa/ecasound experience i referenced was using a PDaudioCF card with a sony U3 way back when we didnt have 24/96k soundcards for laptop recording:

https://archive.org/details/sci2003-10-31.flac24

at the time the vx pocket was the standard but of course only did 48K and the only way to get 24/96 was using that card with a PDA. (702T didnt exist yet). that particular soundcard was more reliable with the linux laptop than with the live24-96 pda software. there are already alsa drivers for this wolfson card and thats 99% of the battle

from what i read so far this should be easy, well need to pull together on case design, power options, etc. im thinking trying to maybe get an order together of like 20 cases or something.

hopefully jon will help us out with his infinite wisdom on cases and power solutions

[jerryfreak]

manual:

http://cpc.farnell.com/images/en_CC/WolfsonRPiSoundcardManual.pdf

future:

http://lifehacker.com/the-adafruit-pitft-makes-adding-a-touchscreen-to-a-rasp-1532669256

(though it appears the screen may use the same pins as the soundcard : http://www.raspberrypi.org/forums/viewtopic.php?f=44&t=72320)

[jerryfreak]

and as far as playback... the options are limitless....

http://forums.slimdevices.com/showthread.php?100724-SqueezePlug-Version-7-available&s=9c5cc30f9da773cf7d69d0c693e5061c

[jerryfreak]

an example of how simple it would be to remotely control this device with a smartphone:

http://www.instructables.com/id/Simple-and-intuitive-web-interface-for-your-Raspbe/?ALLSTEPS

PiUi interface:

http://www.raspberrypi.org/piui-control-your-pi-with-your-phone/

[jerryfreak]

id rather use native 24 bit with no signal processing than anything 16bit at this point

[jerryfreak]

build it we will come...

I am more interested in extreme portability and convenience--a digital out preamp, raspberry pi, and smartphone seems too fussy for me.  I'd use an all-in-one recorder instead.  But I am working on USB and wireless microphone solutions that would work direct to smartphone or tablet.

Most sources don't exceed 12 bit anyway.  The entire analog era, even the top-grade reel machines, operated within no better than 13 bit (before NR schemes, which can be equally applied to digital recording).

[Gutbucket]

USB Audio Class 2.0

Hey TI! Hey AD!  Do you all realize it's 2014? 
Maybe some smaller chip makers will see an opportunity here.

[illconditioned]

What I would like is just a simple system that has two usb ports.
One has a USB 1 compliant device.
The second is a USB flash drive.
And one LED on the system: green = on
Plug in flash card, red=recording, flashing red= full or other error.

That's it.

Maybe I'll hack such a system on a raspberry Pi or an x86 low power box.

  Richard

[Chuck]

This sounds like a fun project. Keep us up to date on your progress.

[jerryfreak]

If you can stand a touchscreen interface rather than a single LED, just about any Android tablet or smartphone could do that.

if there is something that can take bit perfect 24-bit spdif im game

[Gutbucket]

I've got a song, I ain't got no melody
I'ma gonna sing it to my friends

Will it go round in circles?

[H₂O]

You could just pick up a used Tascam HD-P2 for about $250-350 and call it a night (seem to be easily had for under $300 on ebay right now)

It accepts 24bit up to 192Khz on it's SPDIF

[twatts (pants are so over-rated...)]

You could just pick up a used Tascam HD-P2 for about $250-350 and call it a night (seem to be easily had for under $300 on ebay right now)

It accepts 24bit up to 192Khz on it's SPDIF

QFT...  The P2 is a great machine, often overlooked in favor of multi-channel or pocket-sized decks...

Terry

[illconditioned]

What I would like is just a simple system that has two usb ports.
One has a USB 1 compliant device.
The second is a USB flash drive.
And one LED on the system: green = on
Plug in flash card, red=recording, flashing red= full or other error.

That's it.

Maybe I'll hack such a system on a raspberry Pi or an x86 low power box.

  Richard

If you can stand a touchscreen interface rather than a single LED, just about any Android tablet or smartphone could do that.

Is there an APP out there?
Note that the Android device has to act as a USB host for an audio device.  (I think that is the terminology.)

My current solution is an Intel atom "net box" running Linux. Whenever I apply power, it records to an internal drive.
The logical step would be a web based interface to this box, but I haven't got around to it.

  Richard

[jerryfreak]

You could just pick up a used Tascam HD-P2 for about $250-350 and call it a night (seem to be easily had for under $300 on ebay right now)

It accepts 24bit up to 192Khz on it's SPDIF

this would be less than 1/4 of the size and 1/4 of the cost