Pitch to MIDI converter - need help

[gabriel]

Hi, just starting with the Axoloti and I need some help, please.
I once created a pitch to MIDI module in SynC Modular and I want to re-create it in the Axoloti.

I have two questions, hopefully somebody can clarify:
1) How do I create an audio signal clipper, so the output is 1 if the audio sample is above 0 and -1 otherwise? (or 64 and -64)

2) How do I create a "relay" for an audio signal, for example if the absolute value of a signal is above a given value, let the signal pass, if not set to 0. (I found the math/abs module, but not sure how to implement the relay part.
Thanks!

[anon5189335]

2) How do I create a "relay" for an audio signal, for example if the absolute value of a signal is above a given value, let the signal pass, if not set to 0. (I found the math/abs module, but not sure how to implement the relay part.

FOr this use the math objects that does "less than" and "more than". I dont remember the real names of them.

[gabriel]

Thank you for the suggestion. math/< and math/> I see that these accept "green" or "blue" signals and output a boolean only, so they cannot process the audio (red) stream. Or am I wrong here?

The relay object I am looking for has ideally 4 inputs: input, Threshold, A, and B. If the input is above Threshold, then output A, else output B. I am surprised there isn't such an object already available.

Also this triggers another question, can I modify the objects? If so do these need compiling or similar?
I cannot find any documentation for this type of questions. Thank you in advance.

[anon5189335]

Thank you for the suggestion. math/< and math/> I see that these accept "green" or "blue" signals only, so they cannot process the audio (red) stream. Or am I wrong here?

Maybe you can convert the s-rate(red) signal to k-rate(blue) signal, which is for modulation. This is just a long shot and have not tested it or anything.....:

But s-rate is 16 times k-rate.
S-rate= sample rate = Axolotis sample rate is 48000 hz
K-rate= modulation = 3000hz
3000 X 16 = 48000hz

Take the audiosignal you want to use and route it into a div/16 object(blue version) and then to the math objects.... Again I have NO IDEA if this will work or if it is right way to do it but try.... Converting from k-rate to s-rate is easy .cause there are objects for it... the other way around I am not sure about... But try the above and see what comes out of it

Let us know if this works or not.

[anon5189335]

If that doesnt work, maybe check this thread with the yin object:

Creating new objects - Guidlines for operations on large buffers?

An update to enable choosing the buffer size yin.axo (10.4 KB) via attributes. The buffer size determines the delay, computational load and the minimum frequency that can be detected. I was hoping that it could prevent audio glitches with lower buffer sizes, but it doesn't. I'll really need to look into creating threads. The object also returns a periodicity value. A number between 0 and 64 to determine the certainty of the estimation, the periodicity of the input signal. An example patch…

Maybe that can be used in some way. It has s-rate in in and k-rate out.

[lokki]

I have two questions, hopefully somebody can clarify:
1) How do I create an audio signal clipper, so the output is 1 if the audio sample is above 0 and -1 otherwise? (or 64 and -64)

you can use my muls 16bit, it's in my contributions. the signal will be 0 to 64 then.