afonsobarros

hi there : ) i'm trying to use fiddle~ in order to obtain the audio signal

coming from an audio sensor box in www.antfood.com can anyone give me a hint

hi there : ) i'm trying to use fiddle~ in order to obtain the audio signal
coming from an audio sensor box in www.antfood.com can anyone give me a hint
about a patch to do this? thank you


audio-sensor-box

http://www.antfood.com/ads/audiosensing.htm

The box sends out an audio signal ranging from 10khz to 20 khz, so Fiddle would be an appropriate object to use.

On 21 Sep 2006, at 14:29, David Whitely wrote:

> The box sends out an audio signal ranging from 10khz to 20 khz, so 

> Fiddle would be an appropriate object to use.

Except that he is using fixed frequency oscillators, which are 

amplitude modulated by the data. fiddle~ is for frwequency tracking, 

which is not relelvant here. He suggests using fft; you might also 

try narrow band filters tuned to each of the frequencies.

Lawrence Casserley - lawrence@lcasserley.co.uk

Lawrence Electronic Operations - www.lcasserley.co.uk

Colourscape Music Festivals - www.colourscape.org.uk

>
> I think the URL is here:
>
> http://www.antfood.com/ads/audiosensing.htm
>
> The box sends out an audio signal ranging from 10khz to 20 khz, so  
> Fiddle would be an appropriate object to use.

Except that he is using fixed frequency oscillators, which are  
amplitude modulated by the data. fiddle~ is for frwequency tracking,  
which is not relelvant here. He suggests using fft; you might also  
try narrow band filters tuned to each of the frequencies.

Lawrence Casserley - lawrence@lcasserley.co.uk
Lawrence Electronic Operations - www.lcasserley.co.uk
Colourscape Music Festivals - www.colourscape.org.uk


Maybe you can write to the creator of the antbox for an example max patch?

thanks :) i wrote him but i got no answer...i'll keep on trying...

> Maybe you can write to the creator of the antbox for an example max patch?

2006/9/21, David Whitely :
>
>
> Maybe you can write to the creator of the antbox for an example max patch?
>
> dw
>


Here is a patch that theoretically does something like what you will 

need to do. The rect~ objects are merely there as a model of the square 

waves that you will be receiving from your audio interface. The FFT 

portion passes only a specific frequency bin of amplitude data. From 

this, you can use abs~ and rampsmooth~ to follow the amplitude of the 

signal. Remember that you will most likely need to tune your 

oscillators so that they fit nicely into different frequency bins. 

Looking at the schematic, it appears that the left and right channel use 

Seems like a pretty cool circuit. I may try building it myself just to 

Hello,
Here is a patch that theoretically does something like what you will 
need to do.  The rect~ objects are merely there as a model of the square 
waves that you will be receiving from your audio interface.  The FFT 
portion passes only a specific frequency bin of amplitude data.  From 
this, you can use abs~ and rampsmooth~ to follow the amplitude of the 
signal.  Remember that you will most likely need to tune your 
oscillators so that they fit nicely into different frequency bins. 
Looking at the schematic, it appears that the left and right channel use 
the same oscillators.

Seems like a pretty cool circuit.  I may try building it myself just to 
see if it works as advertised.