[aubio-user] pitch detection frequency doubling

[Adam Wilson]

Thanks Paul, I worked it out a few weeks ago.

The issue was that I was mixing stereo to mono signal but one of the instruments I’m using, a steel tongue drum, has almost sine like tones, which would be more susceptible to phase issues than other types of sounds.

So my guess is that there was phasing going on cancelling frequencies out. 

Using the left mono input only solved the issue completely. 



On 18 Dec 2014, at 01:04, Paul Brossier <piem at piem.org> wrote:

> Hi Adam,
> 
> Sorry for the late reply.
> 
> One likely cause is that you are trying to feed a buffer of intereleaved
> samples to the pitch detection:
> 
> [ l1, r1, l2, r2, ..., ln, rn ]
> 
> Make sure you downmix the signal to mono before filling up the fvec you
> pass to aubio_pitch_t.
> 
> Best, Paul
> 
> 
> On 13/08/2014 04:31, Adam Wilson wrote:
>> Hi all
>> 
>> Having some issues with frequency doubling using the pitch detection
>> library. Wonder if there are any known causes for this, any pointers?
>> 
>> 
>> Thanks! Adam _______________________________________________ 
>> aubio-user mailing list aubio-user at aubio.org 
>> https://lists.aubio.org/listinfo/aubio-user
>> 
>