[PD] downsampling with [block~] causing artifacts

[Alexandre Torres Porres]

> You have a waveform with lots of little square steps in it.

And why is that? Moreover, isn't that kinda like having less bit resolution?

cheers

2015-05-15 14:51 GMT-03:00 Martin Peach <chakekatzil at gmail.com>:

> You have a waveform with lots of little square steps in it. Those steps
> contain high frequencies in the same way a square wave does. Dynamic range
> is determined by the number of bits used to encode the signal, and the
> signal/noise ratio, not the sample rate.
>
> Martin
>
> On Fri, May 15, 2015 at 1:18 PM, Alexandre Torres Porres <porres at gmail.com
> > wrote:
>
>> Howdy, I have a patch attached to show how downsampling produces
>> artifacts/distortion for a 440 sine wave. I don't hear "aliasing" and I
>> think it couldn't be foldover at all because 440 is below the nyquist.
>> Moreover, I hear harmonic higher pitches - so it seems like a harmonic
>> distortion from the original sine wave that I can also still perceive. This
>> kind of distortion happens when you have a reduced dynamic range.
>>
>> Another things is that I heard someone saying how increasing sample rate
>> improves dynamic range, but I can't find this information around. Not sure
>> it it's really true, if someone says it is so, please send me a source, ok?
>> But the thing is that the artifacts from this patch could be the result of
>> a smaller SNR.
>>
>> Hope you can help me sort this out.
>>
>> thanks
>>
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