AudioInjector - 2ch / 8ch Audio I/O for Raspberry Pi

Started by admin, April 12, 2017, 12:36:24 PM

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admin

FWIW - I stumbled on this $26
https://www.amazon.com/gp/product/B01HCC0210/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1





http://www.flatmax.org/phpbb/viewforum.php?f=5&sid=782d81135db2b1355363eaad9ae2c866

Sound Card for the Raspberry Pi with inbuilt microphone

Stereo RCA input and output, with volume knobs and inbuilt microphone
Headphone amplifier - 50 mW max power into 16 ohm and 30 mW max power into 32 Ohm headphones
Standard GPIO available to allow you to keep stacking add ons and hats
Linux ALSA driver already integrated into the stock Raspbian release
DAC and ADC : 96 kHz, 32 bit audio.


Could the the basis for hacking an  analog FX Loop in existing DSP gear 


based on Wolfson WM8731 32 bit stereo CODEC IC

https://d3uzseaevmutz1.cloudfront.net/pubs/proDatasheet/WM8731_v4.9.pdf


https://www.cirrus.com/products/wm8731/
http://audioinjector.net/


and this is the big brother version





Audio Injector Octo Raspberry pi sound card


We bring to you the sound audio card (for the Raspberry Pi) which seemed impossible, but now it is done! Push your projects further into un-trodden territory - further then others have gone before.

We are empowering you and your projects to have more than two channels of audio over the GPIO header of the Raspberry Pi - in fact you can get LOTS more!

How did we do it ? This world first approach operates the audio subsystem of microcontrollers more efficiently then ever before !

Stretch Goals

As we have made our goal, we would like to introduce some stretch goals. If you haven't heard, stretch goals are new goal targets which (if accomplished) introduce new elements for free into pledges. We would like to hear from you (backers) what you would like to see as future stretch goals.

Specifications

Audio output : 8 channels
Audio input : 6 channels
Sample rate : 96 kHz
Resolution : 24 bit
Codec : CS42448 (manufacturer page)
Clocking : Chip oscillator driven for low jitter performance.
Extra Requirements : None, just plug onto your Pi.
Software Requirements : Will be part of the stock Raspbian distribution, with drivers uploaded to the official Raspberry Pi git tree. This is similar to the previous hardware we have released and the drivers ship with standard Raspbian ready and working. We also provide setup scripts on the support forum.
Support : The raspberry Pi forum, stackexchange and this Audio injector specific forum.
Specifications : balanced breakout

Add to the previous specifications the following :

8 output and 6 input 1/4" balanced sockets.
20 pin header for both input and output, which includes differential signals and power.
Mute pin for output header.
Using metallized film capacitors for optimum linear performance.
Professional audio line levels (around 1.5 V peak).
Threaded connectors with nuts for face plates (panels).
Output breakout dimensions : 190mm x 45mm
Input breakout dimensions : 145mm x 35mm


http://www.flatmax.org/phpbb/

nix808

This looks so cool!
The problem is that apps for it need to be compiled for ARM processors.
There is a Windows OS for RP though, called Win10IoT

Thanks a bundle for the heads up Adam!
Rock and Rock my boat, as long as you don't rock and rock my boat!hehe

Elantric

#2
The benefit for all is these boards  - they dont specifically require a Raspberry pi to function




This $26 board Could become the basis for hacking an  analog FX Loop in existing DSP gear (VG-99) 


the 2in  / 2 out board is based on Wolfson WM8731 32 bit stereo CODEC IC
$26
https://www.amazon.com/gp/product/B01HCC0210/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1

just address the proper CODEC power rails, boot configuration, bit depth, sample rate, etc,  with typical SPI (MISO, MOSI, SPI_CLK, Data) , and interface the I2S ( MCLK, SCLKC, WCLCK, I2S) to a third party DSP , or splice via I2S in between the two  DSPs on VG-99, etc) & configure with a small micro ( small pic, arduino,teensy, etc.)
https://d3uzseaevmutz1.cloudfront.net/pubs/proDatasheet/WM8731_v4.9.pdf



Very similar to the MikroElektronika MIKROE-506 $19 here
https://www.mikroe.com/



http://www.mouser.com/ProductDetail/MikroElektronika/MIKROE-506/?qs=jBNCx3lXxWu0c2hvNG%252bokg%3D%3D&gclid=CjwKEAjwoLfHBRD_jLW93remyAQSJABIygGpSc3l6cPovPRqTmCHffdg8kXABH6vmLmDFAFtXySzuBoC6xjw_wcB
MIKROE-506
Manufacturer:
MikroElektronika
Description:
Audio IC Development Tools AUDIO CODEC (WM8731) PROTO ADAPTER BOARD

http://www.mouser.com/ds/2/272/acodec_manual_v100-37313.pdf






https://d3uzseaevmutz1.cloudfront.net/pubs/proDatasheet/WM8731_v4.9.pdf

More here
https://www.mikroe.com/

admin

#3
https://www.amazon.com/dp/B06Y3PZ6MF
Octo 8 channel sound card for the Raspberry Pi  $58



8 channels out, 6 channels in, operating over the GPIO header
Linux ALSA driver already integrated into the stock Raspbian release
DAC and ADC : 96 kHz, 24 bit audio.
Customisable analogue breakouts, RCA connectors supplied, Differential lines available.
Support and setup : http://forum.audioinjector.net


http://forum.audioinjector.net/viewforum.php?f=9&sid=b609c7dd7983a5af1f925c6de6ff1268


Question: If I buy this, can I purchase the differential breakouts (just the headers) from you directly?

Answer: Please purchase what you can directly from Amazon. Support is available on the forum, please ask questions there.


Question: What software is required to mix and or use this? Also will you be offering the balanced 1/4 inch version?

Answer: By design, this device uses the Linux ALSA kernel drivers. What that means is that you can use any available software for Linux with this device. Some examples are Audacity, Tracktion, LADSPA, ecasound, jackd, etc. etc. Yes, there is a balanced 1/4 inch version available. Don't forget to check the forum for support : http://forum.audioinjector.net/ see less


Question: I am wanting to set this up for car audio. Is there any plans for a DSP program to be added? Such as parametric EQ and time delays?

Answer: Yes, quite a few people are using the Raspberry Pi this connects to for signal processing. Some people have used it to EQ speaker drivers. Some people have been using it it set constant delays to time match speakers which are a significant distance apart. We have discussed some of these approaches on the support forum. There is some software freely available on Linux to do this. see less


Question: does the headers come with the board?

Answer: Yes, this board comes with the RCA breakout headers and the board. It also includes the ribbon cables. This items doesn't ship with the powered differential breakouts.  The RCA headers give you 8 channels out and 6 channels in. They have a standard RCA line level. The differential breakouts give the same number of channels, however they boost the signal to 12v p-p pro levels with balanced lines for pro-equipment.
By flatmax SELLER  on June 28, 2017