Hi,

software like Pd or jack doesn't care because it's not forbidden to send only positive or even constant values. You might use your DAC to send control voltages for a modular synthesizer, for example. Most audio interfaces, however, apply some kind of highpass filter to the outputs to get rid of very low frequencies, but there are some "DC coupled" audio interfaces which pass the output unchanged. If you use such an interface with speakers, you have to be careful :-) But then again, you speakers might actually have a highpass filter...

Personally, I like to play it safe and add a [hip~ 5] as a DC filter before my [dac~] :-)

Christof

Hi everyone, 

I just found out that I have sent signals between 0..1 instead of -1..1 to [dac]  (!!!), and I am wondering... what happens in that case? 

Does Pd take care of that in any way?

Or, Is that the job of portaudio/asio/jack?

Or, Is that the job of the audio interface? 

Or, nothing happens and you just send non-negative values to a speaker?

I attach a minimal noise test patch to show this (I only hear a difference in loudness on macos using portaudio and a motu...)

Thanks in advance,

f

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