John, I agree with Pippin that it's best to avoid the term "stair steps"
for digital audio as this is misleading. Samples are valid only for
moments in time.
Darren
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Archimago wrote:
> Another MUSINGS post...
>
> Most folks here will know about this already. Wanted to answer a
> question asked by a reader and put an opinion out there...
>
> http://archimago.blogspot.ca/2013/07/musings-is-cd-sound-quality-1644-pcm.html
Your thoughts and comments are pretty
darrenyeats wrote:
> John, I agree with Pippin that it's best to avoid the term "stair steps"
> for digital audio as this is misleading. Each sample pertains to an
> instant ... between those instants is an analogue waveform that we are
> sampling or attempting to re-create.
> Darren
But what ar
flimflam wrote:
> But what are the "steps" undertaken in re-creating the waveform? Clue:
> it's not called a smoothing filter for nothing!
Yea. But that was my point. Unless you know exactly what your waveform
is you are just as likely to AMPLIFY your noise than to SMOOTH your
signal. To really
flimflam wrote:
> But what are the "steps" undertaken in re-creating the waveform? Clue:
> it's not called a smoothing filter for nothing!
The whole point of the sampling theorem is that the samples define ALL
of a complete and continuous analogue waveform of any complexity, as
long as the origi
pippin wrote:
> Yea. But that was my point. Unless you know exactly what your waveform
> is you are just as likely to AMPLIFY your noise than to SMOOTH your
> signal. To really be able to "smooth" you'd have to analyse the whole
> signal spectrum and you'd have to do that over some time - ideally
OK, but that's not "smoothing", that's just low-pass filtering, which
ideally removes ALL effects of the "stair-steps".
However, here we are not talking about analog processing BEHIND the DAC,
we talk about digital processing BEFORE the DAC.
And here "smoothing" is not simple and any kind of arit
pippin wrote:
> OK, but that's not "smoothing", that's just low-pass filtering
Same thing! Smoothing filter is a specific and recognised term for this
filter - whether you like it or not :-) ! The term is used by many,
Analog Devices refer to it by this name a lot. That the stair steps are
smooth
flimflam wrote:
> Same thing! Smoothing filter is a specific and recognised term for this
> filter - whether you like it or not :-) ! The term is used by many,
> Analog Devices refer to it by this name a lot. That the stair steps are
> smoothed seems obvious, the term does not mean to imply anyth
