<![CDATA[About a Waveshaper in SNEX]]>Hello guys

I have 2 arrays that I measured before from a wave shaper function.

I need a wave shaper that analyses input sample and match/calculate to these lookup tables with interpolation.

For example if the input sample is between -1.0 and -0.7 (SigInData[0] & SigInData[1]), then the output will be calculated between -0.8 & -0.43 (SigOutData[0] & SigOutData[1]).

How can I integrate this to SNEX, please help?

const SigInData = [-1.0f, -0.7f, -0.65f, -0.5f, 0.0f, 0.5f, 0.89f, 0.96f, 1.0f];

const SigOutData = [-0.8f, -0.43f, -0.35f, -0.3f, 0.0f, 0.24f, 0.4f, 0.5f, 0.9f];
]]>https://forum.hise.audio/topic/6309/about-a-waveshaper-in-snexRSS for NodeSun, 12 Jul 2026 18:33:41 GMTTue, 13 Sep 2022 10:23:16 GMT60<![CDATA[Reply to About a Waveshaper in SNEX on Tue, 13 Sep 2022 11:23:09 GMT]]>@orange @Christoph-Hart

Thank you so much guys, really appreciate your help! 👍

]]>https://forum.hise.audio/post/54668https://forum.hise.audio/post/54668Tue, 13 Sep 2022 11:23:09 GMT<![CDATA[Reply to About a Waveshaper in SNEX on Tue, 13 Sep 2022 11:09:25 GMT]]>@Christoph-Hart Looks very useful, thanks.

]]>https://forum.hise.audio/post/54665https://forum.hise.audio/post/54665Tue, 13 Sep 2022 11:09:25 GMT<![CDATA[Reply to About a Waveshaper in SNEX on Tue, 13 Sep 2022 11:08:32 GMT]]>@orange This test:

https://github.com/christophhart/HISE/blob/develop/tools/snex_playground/test_files/index/index11.h

And this C++ file has a pretty comprehensive documentation:

https://github.com/christophhart/HISE/blob/develop/hi_dsp_library/snex_basics/snex_IndexTypes.h

Although I haven't setup the doc building process to include it to the HISE docs yet.

]]>https://forum.hise.audio/post/54664https://forum.hise.audio/post/54664Tue, 13 Sep 2022 11:08:32 GMT<![CDATA[Reply to About a Waveshaper in SNEX on Tue, 13 Sep 2022 11:07:55 GMT]]>@Christoph-Hart said in About a Waveshaper in SNEX:

If you've done that, you can use a special index type in SNEX that already does the interpolation for you, but that's just syntactic sugar.

Interesting, is there any example for this interpolation for the above example?

]]>https://forum.hise.audio/post/54662https://forum.hise.audio/post/54662Tue, 13 Sep 2022 11:07:55 GMT<![CDATA[Reply to About a Waveshaper in SNEX on Tue, 13 Sep 2022 10:52:49 GMT]]>From SNEX specific things aside, you shouldn't carry around two lookup tables, just transform them into one where you can just run the signal through. Mathematically there is no reason for two separate lookup tables and using one will heavily reduce the performance.

If you've done that, you can use a special index type in SNEX that already does the interpolation for you, but that's just syntactic sugar.

]]>https://forum.hise.audio/post/54657https://forum.hise.audio/post/54657Tue, 13 Sep 2022 10:52:49 GMT<![CDATA[Reply to About a Waveshaper in SNEX on Tue, 13 Sep 2022 10:42:22 GMT]]>@harris-rosendahl The SNEX uses C++ language. For the arrays, use span with the corresponding variable precision. For more examples on SNEX you can compile Hise > Tools > snex_playground project and see the tons of examples.

The below example will make a linear interpolation between the data. BTW, since you haven't defined any data for > 1.0 and < -1.0 statements in your lookup table, this will shape between -1.0 & 1.0. Here you go ;)

span<float, 9> SigInData = { -10.0f, -0.7f, -0.65f, -0.5f, 0.0f, 0.5f, 0.89f, 0.96f, 10.0f};

span<float, 9> SigOutData = { -0.8f, -0.43f, -0.35f, -0.3f, 0.0f, 0.24f, 0.4f, 0.5f, 0.9f};
 		

float getSamples(float input)
{	
	for(int i = 0; i < 9; i++)
	{
		if(input >= SigOutData[i] && input < SigOutData[i+1])	
		{
		  input = ((SigOutData[i+1] - SigOutData[i]) * (input - SigInData[i]) / (SigInData[i] - SigInData[i])) + SigOutData[i];			
		}		
	}
	
	return input;		
}
]]>https://forum.hise.audio/post/54653https://forum.hise.audio/post/54653Tue, 13 Sep 2022 10:42:22 GMT