On Aug 28, 2015 5:17 PM, "Pierre-Andre Noel"
wrote:
>
> I had in mind the use of FFT to do convolutions (
> https://en.wikipedia.org/wiki/Convolution_theorem ). If you do not
> zero-pad properly, then the end of the signal may "bleed" on the
> beginning, and vice versa.
Ah, gotcha! All these thin
> Zero-padding won't help with the non-periodicity, will it? For
> that you may want to window instead.
Umh, it depends what you use the FFT for. You are right Stéfan when
saying that Joseph should probably also use a window to get rid of the
high frequencies that will come from the sharp ste
On Fri, Aug 28, 2015 at 3:36 PM, Jaime Fernández del Río <
jaime.f...@gmail.com> wrote:
> On Fri, Aug 28, 2015 at 2:40 AM, Sebastian Berg <
> sebast...@sipsolutions.net> wrote:
>
>> On Fr, 2015-08-28 at 09:46 +0100, Matthew Brett wrote:
>> > Hi,
>> >
>> > On Fri, Aug 28, 2015 at 5:59 AM, Jaime Fer
On 2015-08-28 16:20:33, Pierre-Andre Noel
wrote:
> If your sequence is not meant to be periodic (i.e., if after one
> minute there is no reason why the signal should start back at
> the beginning right away), then you should do zero-padding. And
> while you zero-pad, you can zero-pad to a s
If your sequence is not meant to be periodic (i.e., if after one minute
there is no reason why the signal should start back at the beginning
right away), then you should do zero-padding. And while you zero-pad,
you can zero-pad to a sequence that is a power of two, thus preventing
awkward facto
On Fri, Aug 28, 2015 at 2:40 AM, Sebastian Berg
wrote:
> On Fr, 2015-08-28 at 09:46 +0100, Matthew Brett wrote:
> > Hi,
> >
> > On Fri, Aug 28, 2015 at 5:59 AM, Jaime Fernández del Río
> > wrote:
> > > On Thu, Aug 27, 2015 at 11:06 AM, Matthew Brett <
> matthew.br...@gmail.com>
> > > wrote:
> >
On 2015/08/28 10:36 AM, Sebastian Berg wrote:
> If you don't mind the extra dependency or licensing and this is an issue
> for you, you can try pyfftw (there are likely other similar projects)
> which wraps fftw and does not have this problem as far as I know. It
> exposes a numpy-like interface.
If you don't mind the extra dependency or licensing and this is an issue
for you, you can try pyfftw (there are likely other similar projects)
which wraps fftw and does not have this problem as far as I know. It
exposes a numpy-like interface.
- sebastian
On Fr, 2015-08-28 at 19:13 +, Joseph
Great, thanks Stefan and everyone.
> From: stef...@berkeley.edu
> To: numpy-discussion@scipy.org
> Date: Fri, 28 Aug 2015 12:03:52 -0700
> Subject: Re: [Numpy-discussion] Numpy FFT.FFT slow with certain samples
>
>
> On 2015-08-28 11:51:47, Joseph Codadeen
> wrote:
> > my_1_minute_noise_with_g
On 2015-08-28 11:51:47, Joseph Codadeen
wrote:
> my_1_minute_noise_with_gaps_truncated - Array len is
> 2646070my_1_minute_noise_with_gaps - Array len is 2649674
In [6]: from sympy import factorint In [7]:
max(factorint(2646070)) Out[7]: 367 In [8]:
max(factorint(2649674)) Out[8]: 1324837
my_1_minute_noise_with_gaps_truncated - Array len is
2646070my_1_minute_noise_with_gaps - Array len is 2649674
> Date: Fri, 28 Aug 2015 14:28:49 -0400
> From: ho...@stsci.edu
> To: numpy-discussion@scipy.org
> Subject: Re: [Numpy-discussion] Numpy FFT.FFT slow with certain samples
>
> On 08/28/2
On Fri, Aug 28, 2015 at 11:02 AM, Joseph Codadeen
wrote:
> Hi,
>
> I am a numpy newbie.
>
> I have two wav files, one that numpy takes a long time to process the FFT.
> They was created within audacity using white noise and silence for gaps.
>
>
>1. my_1_minute_noise_with_gaps.wav
>2. my_
On 08/28/2015 02:02 PM, Joseph Codadeen wrote:
>
> * my_1_minute_noise_with_gaps_truncated took***30.75620985s* to process.
> * my_1_minute_noise_with_gaps took *22307.13917s*to process.
>
You didn't say how long those arrays were, but I can make a good guess
that the truncated one had a leng
Hi,
I am a numpy newbie.
I have two wav files, one that numpy takes a long time to process the FFT. They
was created within audacity using white noise and silence for gaps.
my_1_minute_noise_with_gaps.wavmy_1_minute_noise_with_gaps_truncated.wav
The files are very similar in the following way;
On Fr, 2015-08-28 at 09:46 +0100, Matthew Brett wrote:
> Hi,
>
> On Fri, Aug 28, 2015 at 5:59 AM, Jaime Fernández del Río
> wrote:
> > On Thu, Aug 27, 2015 at 11:06 AM, Matthew Brett
> > wrote:
> >>
> >> Hi,
> >>
> >> On Thu, Aug 27, 2015 at 6:23 PM, wrote:
> >> >
> >> >
> >> > On Thu, Aug 27,
Hi,
On Fri, Aug 28, 2015 at 5:59 AM, Jaime Fernández del Río
wrote:
> On Thu, Aug 27, 2015 at 11:06 AM, Matthew Brett
> wrote:
>>
>> Hi,
>>
>> On Thu, Aug 27, 2015 at 6:23 PM, wrote:
>> >
>> >
>> > On Thu, Aug 27, 2015 at 12:22 PM, Matthew Brett
>> >
>> > wrote:
>> >>
>> >> Hi
>> >>
>> >> On
+10 Very well written down ideas Jaime.
2015-08-28 6:59 GMT+02:00 Jaime Fernández del Río :
> On Thu, Aug 27, 2015 at 11:06 AM, Matthew Brett
> wrote:
>
>> Hi,
>>
>> On Thu, Aug 27, 2015 at 6:23 PM, wrote:
>> >
>> >
>> > On Thu, Aug 27, 2015 at 12:22 PM, Matthew Brett <
>> matthew.br...@gmail
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