[Csnd] Some help in filtering audio
| Date | 2020-04-21 18:26 |
| From | Francesco Porta |
| Subject | [Csnd] Some help in filtering audio |
Hello All,
i'm try to work on a piece where i need to trigger some event when input has a particular frequency.
I use a onset detection udo (from Heintz) that will start an analysis on input.
Then i need to have another trigger when analysis find only a frequency (i.e. D2, ~73 Hz).
I know it is a difficult task because i'm working with a guitar in input (not only! Classical guitar
using laptop built in microphone!!!).
I tried to use a filtered signal as input for analysis trying to
cut high frequency or bandpass or resonance on my frequency but my attempt are failing
because some other frequency (i suspect harmonic partial) will trigger.
Anyone has some idea of what i can do?
many thanks for any hints,
ciao,
francesco.
Csound mailing list
Csound@listserv.heanet.ie
https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
Send bugs reports to
https://github.com/csound/csound/issues
Discussions of bugs and features can be posted here |
| Date | 2020-04-21 19:18 |
| From | Jana Hübenthal |
| Subject | Re: [Csnd] Some help in filtering audio |
Hi Francesco,
do you play single notes or chords? If you are on single notes,
sometimes raising the signal level with limiting afterwards helps with
frequency detection issues (Result is a more rectangular signal with
harmonics suppressed by some amount). Further, I would recommend a
separate microphone (clip-on for acoustic guitars). You get much too
much influence from room acoustics in your current setup.
Best,
Jana
Am 21.04.20 um 19:26 schrieb Francesco Porta:
> Hello All,
> i'm try to work on a piece where i need to trigger some event when input has a particular frequency.
> I use a onset detection udo (from Heintz) that will start an analysis on input.
> Then i need to have another trigger when analysis find only a frequency (i.e. D2, ~73 Hz).
> I know it is a difficult task because i'm working with a guitar in input (not only! Classical guitar
> using laptop built in microphone!!!).
> I tried to use a filtered signal as input for analysis trying to
> cut high frequency or bandpass or resonance on my frequency but my attempt are failing
> because some other frequency (i suspect harmonic partial) will trigger.
> Anyone has some idea of what i can do?
>
> many thanks for any hints,
> ciao,
> francesco.
>
> Csound mailing list
> Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
> Send bugs reports to
> https://github.com/csound/csound/issues
> Discussions of bugs and features can be posted here
Csound mailing list
Csound@listserv.heanet.ie
https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
Send bugs reports to
https://github.com/csound/csound/issues
Discussions of bugs and features can be posted here |
| Date | 2020-04-22 09:04 |
| From | Oeyvind Brandtsegg |
| Subject | Re: [Csnd] Some help in filtering audio |
Agree that the audio input needs to be as clean as possible. Pitch tracking is quite sensitive to noise. You can also try different pith tracking methods (ptrack, plltrack, pitchamdf). When using ptrack, do *not* filter out the higher harmonic content, as this will defeat what the algorithm attempts to do (find correlations between harmonics and then deduce the fundamental). tir. 21. apr. 2020 kl. 20:18 skrev Jana Hübenthal <jana@ebene11.de>: Hi Francesco, |