i can answer one question. i have built an adaptor for a modified zoom h2 to
core sound. just a small box with a nine volt battery, four three pin mini xlrs
to take the core sound signal. you can safely apply the nine volts to the core
sound +ve connection. the zoom itself can be modified so the four internal
microphone connections can be directly brought out to a five pin xlr, (i have
published this mod with a small part made at shapeways.) i built a system like
this for john leanord in this group, but made several mistakes mostly by being
over elaborate. no need for a regulated five volt circuit, or for additional
gain either (the core sound mic has very low output). John said my circuit eats
batteries, but that is because of the quad opamp gain circuit. umashankar
From: bo-erik.sandh...@ericsson.com
To: sursound@music.vt.edu
Date: Tue, 2 Oct 2012 16:30:42 +0200
Subject: [Sursound] Low cost mobile ambisonic recording possible ?
I want to lighten my burden when traveling and maybe do a recording. I want
to avoid spending much more money on this.
So I want to put a few questions on the table.
I can accept to carry the Motu Traveler as the Microphone inputs and the gain
controls and level monitoring works well.
So I want to build / assemble something low weight and small to add to the
MOTU as a pure digital recording device.
The MOTU can be configured as a mixer outputting ADAT or dual SPDIF for 4
channels.
The Dual SPDIF signals have the eventual advantage of having a choice of
44.1, 48, 96 or 192 kHz sampling rate.
So being as unstructured as I am I have a few wild ideas.
My first question:
- If using 2 USB sound interfaces with spdif inputs, should the audio
interfaces not stay in sync as long as the input signals from the MOTU stays
in sync?
If so, This would make it possible to use 2 low cost USB audio cards
with SPDIF inputs?
- can this be correct?
- Can dual SPDIF inputs be directly added to the RPi?
- Can 2 I2S input modules be used
http://www.pavouk.org/hw/modulardac/en_dir9001spdif.html and connected to a
RPi, would the drivers be difficult to create?
or maybe ADAT via I2S?
Not so expensive ADAT receiver modules with I2S interface
http://electronics.dantimax.dk/Kits/Digital_audio/11329401182.html
http://www.pcm63.com/?332,adat-receiver-module
A very simple recording program or App for 4 channels should be possible to
create for the RPi on linux or Android, ardour is overkill.
Analog Line in to Zoom H2 from the MOTU feels not good enough as it will be
AD - DA - AD conversion.
A much lower weight solution, but maybe lower quality overall?
Have someone created a small circuit to interface the coresound directly to
a ZOOM H2?
My idea for this would be:
- External Battery feed to the ZOOM H2 to redusing internal voltage converter
disturbance signals,
6 Volt to the coresound mic, could the Tetramic capsules be directly
connected to the H2, maybe a Capacitor needed to isolate DC levels?
Currently I have and use this hardware:
Coresound tetramic
Motu traveler MK3
Large Toshiba A100 portable PC.
Zoom H2 - not modified ( yet with 4 line inputs ) use as backup in case of
problems with primary system.
On Order:
Raspberry Pi
2 USB Soundcard with SPDIF input
http://www.amazon.com/dp/B000XXY5Q4/ref=pe_175190_21431760_M3T1_SC_3p_dp_1
- Bo-Erik
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