AudioScope...


 
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The Lounge What is on Your Mind? AudioScope...
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Old 06-26-2015
AudioScope...

Boy oh boy, with only a MONO mic input to use AudioScope gets much more difficult when the ALTDC board is included.

It needs, so far, two hits at the MIC input with a single hit at the HEADPHONE audio output.

The first at the highest practical resolution for the AC component and the second for the DC component, IF any.

This means I have to record the AC component first, using the Y amp, then send a trigger pulse to a monostable to hold a relay to switch the input to the DC board AND the output of the DC board to the input of the Y amp.

Simple enough but what started out as a basic project as a learning tool for both myself and kids has turned into something that shell scripting and a(n) MBP 13" laptop using AF I/O was not designed for.

The builtin counter measures much better, on average, than my quoted 0.1% accuracy against my pro-gear here so, although it will be long-winded to use this will be used in the setting up and calibrating the 'ALTDC' board.

I will upload a block diagram of what I am aiming for in the not too distant future...

Without you big guns chipping in with your help this project would have never gotten off of the ground...

Thanks guys...

Bazza...
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MIXERCTL.CONF(5)					      BSD File Formats Manual						  MIXERCTL.CONF(5)

NAME
mixerctl.conf -- audio mixer configuration file SYNOPSIS
mixerctl.conf DESCRIPTION
The /etc/mixerctl.conf file consists of mixerctl(1) variables to set at boot time. Each line of mixerctl.conf has the following format: variable=value To generate a mixerctl.conf from the current mixer settings, execute: mixerctl -a > /etc/mixerctl.conf Set mixerctl to YES in rc.conf(5) to have the variables set at boot time. Additionally, you can have the settings saved and restored for the devices of your choice by listing them in mixerctl_mixers in rc.conf(5). FILES
/etc/mixerctl.conf EXAMPLES
Example mixer settings for an esa(4) audio adapter: outputs.master=255,255 outputs.master.mute=off outputs.mono=255 outputs.mono.mute=on outputs.mono.source=mixerout outputs.headphones=255,255 outputs.headphones.mute=off outputs.tone=255,255 inputs.speaker=255 inputs.speaker.mute=off inputs.phone=191 inputs.phone.mute=on inputs.mic=191 inputs.mic.mute=on inputs.mic.preamp=off inputs.mic.source=mic0 inputs.line=191,191 inputs.line.mute=on inputs.cd=191,191 inputs.cd.mute=on inputs.video=255,255 inputs.video.mute=off inputs.aux=255,255 inputs.aux.mute=off inputs.dac=191,191 inputs.dac.mute=off record.source=mic record.volume=255,255 record.volume.mute=off record.mic=0 record.mic.mute=off outputs.loudness=off outputs.spatial=off outputs.spatial.center=0 outputs.spatial.depth=0 SEE ALSO
mixerctl(1), rc.conf(5) HISTORY
The mixerctl.conf configuration file first appeared in NetBSD 2.0. BSD
April 5, 2003 BSD