Forums > MaxMSP

Audio Switcher


dnz
January 26, 2008 | 4:58 pm

Hallo,

does anyone know or could give me tips/advice if i can build a
hardware switcher like the external Bucket?

what i want to build is rather simple. the hardware takes 1 input and
distrubute it into say 16 outputs. After the input and before the
outputs, i would like to have a hardware kind of switcher which i can
set a timer (either in hardware or max controlled) so that it sends
the audio to output 1 for 10 secs, then switches to output 2 for 10
secs, output 3 for 10 secs and so on. i

I hope that i’m clear enough.

Anyone? any help would be appreciate.

best

denniz


January 26, 2008 | 6:16 pm

matrix~



dnz
January 26, 2008 | 7:51 pm

yes, it’s still software. how about hardware?
Am 26.01.2008 um 19:16 schrieb don malone:

>
> matrix~
> –
> it takes all of us
> LoneMonad
> http://faculty.roosevelt.edu/malone/default.htm


January 26, 2008 | 8:16 pm

On Jan 26, 2008, at 11:51 AM, Sonic Kooking wrote:

> yes, it’s still software. how about hardware?

Combined with a hardware MIDI control source, something like the
Switchblade could do the actual switching. Not a cheap solution, though.

http://www.soundsculpture.com/

-C



dnz
January 26, 2008 | 11:38 pm

thanks Chris for the link.

hmm. i wonder if i could build the electronics and control it with
arduino.

dnz

Am 26.01.2008 um 21:16 schrieb Chris Muir:

>
> On Jan 26, 2008, at 11:51 AM, Sonic Kooking wrote:
>
>> yes, it’s still software. how about hardware?
>
> Combined with a hardware MIDI control source, something like the
> Switchblade could do the actual switching. Not a cheap solution,
> though.
> http://www.soundsculpture.com/
>
> -C
>


January 27, 2008 | 1:20 am

Just an idea :
You can use a digital Mix Deck (01V96 Yamaha,…) control by MIDI messages.

fxw


January 27, 2008 | 2:59 am

I think using matrix~ with a 16 channel sound card would be the simplest solution.


January 27, 2008 | 7:16 am



dnz
January 27, 2008 | 1:04 pm


January 27, 2008 | 2:25 pm

if you go the multiplexer route you need to be aware that a multiplexer has many inputs and one output and a demultiplexer has one input many outputs – this is probably what you want.


January 27, 2008 | 3:16 pm

well, if you’re dealing with analogue voltage it would seem that
current can flow both ways, don’t you think?

from the the data sheet:

The CD74HC4067 and CD74HCT4067 devices are digitally
controlled analog switches that utilize silicon-gate CMOS
technology to achieve operating speeds similar to LSTTL,
with the low power consumption of standard CMOS
integrated circuits.
These analog multiplexers/demultiplexers control analog
voltages that may vary across the voltage supply range.
They are bidirectional switches thus allowing any analog
input to be used as an output and vice-versa.

/*j

> if you go the multiplexer route you need to be aware that a
> multiplexer has many inputs and one output and a demultiplexer has
> one input many outputs – this is probably what you want.


January 27, 2008 | 4:43 pm

Quote: jasch wrote on Sun, 27 January 2008 15:16
—————————————————-
> well, if you’re dealing with analogue voltage it would seem that
> current can flow both ways, don’t you think?

yes it can because the CD74HC4067 and CD74HCT4067 are combined Multiplexer/Demultiplexer’s


January 27, 2008 | 6:28 pm

On Jan 27, 2008, at 6:26 AM, Leafcutter John wrote:
> if you go the multiplexer route you need to be aware that a
> multiplexer has many inputs and one output and a demultiplexer has
> one input many outputs – this is probably what you want.

You should further note that the chips in question know nothing about
audio, so they’ll switch whenever they’re told to switch. This causes
problems if there’s audio sounding when they’re told to switch: there
will be clicks on the output that is being switched from, as well as
the channel that is being switched to.

Another approach, although also expensive, is to configure a modular
synth to do this. You would need a sequencer that had individual stage
outputs, as well as a VCA and lag processor (or perhaps envelope
generator) per channel.

-C


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