how about encoding it normalized to 0. - 1.as amplitude in 3 sinewaves, about 1 octave (or better some non-harmonic spacing) apart and then separating the sinewaves with sigmund or fft? probably depends on how much precision you need to have.
cheers hans
Am 20.08.2017 um 09:59 schrieb cyrille henry ch@chnry.net:
Le 19/08/2017 à 23:18, Max a écrit :
On 2017년 08월 19일 23:03, cyrille henry wrote:
If I'd would want to encode (sensor) data in an audio signal, how would I go about that?
if the sensor output analog value, i'll just use 2 AOP : 1st one to create saw waveform and the 2nd one as a comparator to create a PWM rectangle wave.
in pd side, you can use >~ 0 and a lop~.
I'm not sure I understand. What's an AOP?
sorry, I mean OPAMP (AOP is the french term) This solution is to convert the analogue value to high/low ratio of a rectangle wave
if you want somthing more reactive, you can encode the sensor valuee in a frequency (using a VCO)
Like a pair of osc~ and sigmund~ (attached)?
in your example, the sensor change the amplitude of the signal. Since you where asking for "a volume independent solution", I propose changing the frequency of the signal.
I need 3 values of 7 bit in one channel.
oh, 3 sensors on a single audio channel : it's a bit much for a simple solution. At least using only analogue electronics.
if you have a digital system to encore the data, you can use a PPM signal. https://en.wikipedia.org/wiki/Pulse-position_modulation http://www.fpv-hero.de/Images/PPM1.jpg
You can also send value as serial data at 9600 b/s
can you tell us more about your setup? why can't you use usb to get the value?
cheers c
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