[Portaudio] Cannot find a ease hello world FFT or what ever frequency finder.

Bjorn Roche bjorn at shimmeo.com
Tue Mar 15 10:12:40 EDT 2016


Thanks Phil. I'm pretty sure this is not the first time I've had to fix
that. Blogger is just the worst. :-P

On Mon, Mar 14, 2016 at 9:26 PM, Phil Burk <philburk at mobileer.com> wrote:

> Bjorn,
>
> Nice! But I think the '<' character in your for loops caused the line to
> get truncated.
>
>    for( int j=0; j
>
> Phil
>
> On Mon, Mar 14, 2016 at 8:06 AM, Bjorn Roche <bjorn at shimmeo.com> wrote:
>
>> Robert is correct that Goertzel's algorithm is probably better if you are
>> just looking for one or two known pitches.
>>
>> That said, I've seen this question so often on stack overflow that I
>> wrote a blog post (with code) about this some time ago. The concept is
>> simple, but the devil's in the details, so having it explained with working
>> code should help.
>>
>>
>> http://blog.bjornroche.com/2012/07/frequency-detection-using-fft-aka-pitch.html
>>
>> On Mon, Mar 14, 2016 at 10:45 AM, Robert Bielik <Robert.Bielik at dirac.se>
>> wrote:
>>
>>> As long as you only need to detect specific frequencies, the Goertzel
>>> algo should be ok:
>>> http://stackoverflow.com/questions/11579367/implementation-of-goertzel-algorithm-in-c
>>>
>>>
>>>
>>> Applying the algo to the correct portions of wav file is left as an
>>> exercise for the reader ;)
>>>
>>>
>>>
>>> Regards
>>>
>>> /R
>>>
>>>
>>>
>>> *From:* portaudio-bounces at lists.columbia.edu [mailto:
>>> portaudio-bounces at lists.columbia.edu] *On Behalf Of *keghn at netscape.net
>>> *Sent:* den 14 mars 2016 15:36
>>> *To:* portaudio at lists.columbia.edu
>>> *Subject:* [Portaudio] Cannot find a ease hello world FFT or what ever
>>> frequency finder.
>>>
>>>
>>>
>>> Is there a c/c++ software that looks for a certain frequency in a wav
>>> file? For example, like a c/c++ function that will return the strength
>>> 440Hz frequency between 10 seconds and 12 seconds in a 60 second wav file.
>>>
>>> _______________________________________________
>>> Portaudio mailing list
>>> Portaudio at lists.columbia.edu
>>> https://lists.columbia.edu/mailman/listinfo/portaudio
>>>
>>
>>
>>
>> --
>> Bjorn Roche
>> @shimmeoapp
>>
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>
>
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-- 
Bjorn Roche
@shimmeoapp
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