> On Aug 17, 2015, at 7:23 PM, robert bristow-johnson
> wrote:
>
> On 8/17/15 7:29 PM, Sampo Syreeni wrote:
>>
>>> to me, it really depends on if you're doing a slowly-varying precision
>>> delay in which the pre-emphasis might also be slowly varying.
>>
>> In slowly varying delay it ought t
On 8/17/15 7:29 PM, Sampo Syreeni wrote:
On 2015-08-17, robert bristow-johnson wrote:
As I noted in the first reply to this thread, while it’s temping to
look at the sinc^2 rolloff of a linear interpolator, for example, and
think that compensation would be to boost the highs to undo the
rollo
Thanks for the suggestions and discussion.
In my application I'm playing back 44.1khz wavefiles with variable pitch
envelopes. I'm currently using hermite interpolation and the quality
seems fine for playback. It's only after resampling and running through
the audio engine multiple times does
And to add to what Robert said about “write code and sell it”, sometimes it’s
more comfortable to make general but helpful comments here, and stop short of
detailing the code that someone paid you a bunch of money for and might not
want to be generally known.
And before people assume that I mea
On 2015-08-17, robert bristow-johnson wrote:
As I noted in the first reply to this thread, while it’s temping to
look at the sinc^2 rolloff of a linear interpolator, for example, and
think that compensation would be to boost the highs to undo the
rolloff, that won’t work in the general case. E
OK, Robert, I did consider the slow versus fast issue. But there have been few
caveats posted in this thread, so I thought it might be misleading to some to
not be specific about context. The worst case would be a precision delay of an
arbitrary constant. (For example, at 44.1 kHz SR, there woul
On 8/17/15 2:39 PM, Nigel Redmon wrote:
Since compensation filtering has been mentioned by a few, can I ask if someone
could get specific on an implementation (including a description of constraints
under which it operates)? I’d prefer keeping it simple by restricting to linear
interpolation,
On 17/08/2015, STEFFAN DIEDRICHSEN wrote:
> I could write a few lines over the topic as well, since I made such a
> compensation filter about 17 years ago.
> So, there are people, that do care about that topic, but there are only
> some, that do find time to write up something.
I also made a comp
On 8/17/15 12:07 PM, STEFFAN DIEDRICHSEN wrote:
I could write a few lines over the topic as well, since I made such a
compensation filter about 17 years ago.
So, there are people, that do care about that topic, but there are
only some, that do find time to write up something.
;-)
Steffan
On
Yeah I am also curious. It's not obvious to me where it would make sense to
spend resources compensating for interpolation rather than just juicing up
the interpolation scheme in the first place.
E
On Mon, Aug 17, 2015 at 11:39 AM, Nigel Redmon
wrote:
> Since compensation filtering has been men
Since compensation filtering has been mentioned by a few, can I ask if someone
could get specific on an implementation (including a description of constraints
under which it operates)? I’d prefer keeping it simple by restricting to linear
interpolation, where it’s most needed, and perhaps these
No experience with compensation filters here.
But if you can afford to use a higher order interpolation scheme, I'd go
for that.
Using Newton's Backward Difference Formula, one can construct
time-varying, table-free, efficient Lagrange interpolation schemes of
arbitrary order (up to 30-th or
I could write a few lines over the topic as well, since I made such a
compensation filter about 17 years ago.
So, there are people, that do care about that topic, but there are only some,
that do find time to write up something.
;-)
Steffan
> On 17.08.2015|KW34, at 17:50, Theo Verelst wro
For people including scientific oriented it always surprises me how
little actual science is involved in this talk about tradeoffs.
First, what it is you want to achieve by preserving high frequencies
(which of course I'm all for)? Second, is it really only at the level of
first order interp
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Talking about the all-pass modulation, (and also reconnecting to a past hot
post about time varying filters), did anyone tried the following:
1) see if the allpass passes the minimum norm criterion that Laroche introduced
(maybe the 5 samples transient found in the paper for a in the range
0.618
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