Helium Voice effect algorithm
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From: emitrax on 24 May 2010 06:36 Hi, hopefully I'm writing to the correct group. I'm looking for a project to start learning DSP programming, and an idea that come to my mind was to implement an algorithm that, getting my voice as input, would output the voice with the helium effect. I've googled a bit to see if there is already an algorithm that explain how to implement this, because I certainly don't have the knowledge to come with the algorithm myself (I just wanted to implement it for fun), but I couldn't found anything. So I'm wondering if any of you have any lecture to point me to? Thanks in advance. Regards, Salvatore
From: igor b. on 24 May 2010 07:38 On 24.05.2010 12:36, emitrax wrote: > Hi, > > hopefully I'm writing to the correct group. > > I'm looking for a project to start learning DSP programming, and an > idea > that come to my mind was to implement an algorithm that, getting my > voice as input, would output the voice with the helium effect. > > I've googled a bit to see if there is already an algorithm that > explain > how to implement this, because I certainly don't have the knowledge to > come with the algorithm myself (I just wanted to implement it for > fun), > but I couldn't found anything. > > So I'm wondering if any of you have any lecture to point me to? > > Thanks in advance. > > Regards, > Salvatore Helium effect is basically shifting up the pitch of a voice. Probably easiest way to do it is with phase vocoder. Here's a 'original' phase vocoder tutorial if you want to know the theory: https://ccrma.stanford.edu/~juhan/220c/papers/Dolson86.pdf And here is exactly what you need, together with C code: http://www.dspdimension.com/admin/pitch-shifting-using-the-ft/ Cheers! Igor
From: Jerry Avins on 24 May 2010 08:46 On 5/24/2010 6:36 AM, emitrax wrote: > Hi, > > hopefully I'm writing to the correct group. > > I'm looking for a project to start learning DSP programming, and an > idea > that come to my mind was to implement an algorithm that, getting my > voice as input, would output the voice with the helium effect. > > I've googled a bit to see if there is already an algorithm that > explain > how to implement this, because I certainly don't have the knowledge to > come with the algorithm myself (I just wanted to implement it for > fun), > but I couldn't found anything. > > So I'm wondering if any of you have any lecture to point me to? Helium shifts the resonances of the vocal tract upward. It has slight effect on the vocal cords, which determine the voice's pitch. The vocal tract resonances are called formants, and are modified somewhat by muscles in the process of speaking. It is difficult enough to remove the effects of invariant formants. I have no idea how to track and remove changing ones. There is probably a way you can simulate the sound well enough to please yourself. Perhaps pitch shifting would do. (You could compensate for the shift of the basic cord frequencies by speaking in a lower range.) Jerry -- "I view the progress of science as ... the slow erosion of the tendency to dichotomize." --Barbara Smuts, U. Mich. �����������������������������������������������������������������������
From: emitrax on 24 May 2010 09:38 On 24 Mag, 14:46, Jerry Avins <j...(a)ieee.org> wrote: > On 5/24/2010 6:36 AM, emitrax wrote: > > > > > > > Hi, > > > hopefully I'm writing to the correct group. > > > I'm looking for a project to start learning DSP programming, and an > > idea > > that come to my mind was to implement an algorithm that, getting my > > voice as input, would output the voice with the helium effect. > > > I've googled a bit to see if there is already an algorithm that > > explain > > how to implement this, because I certainly don't have the knowledge to > > come with the algorithm myself (I just wanted to implement it for > > fun), > > but I couldn't found anything. > > > So I'm wondering if any of you have any lecture to point me to? > > Helium shifts the resonances of the vocal tract upward. It has slight > effect on the vocal cords, which determine the voice's pitch. The vocal > tract resonances are called formants, and are modified somewhat by > muscles in the process of speaking. It is difficult enough to remove the > effects of invariant formants. I have no idea how to track and remove > changing ones. There is probably a way you can simulate the sound well > enough to please yourself. Perhaps pitch shifting would do. (You could > compensate for the shift of the basic cord frequencies by speaking in a > lower range.) > > Jerry > -- > "I view the progress of science as ... the slow erosion of the tendency > to dichotomize." --Barbara Smuts, U. Mich. > ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ Looks like I posted to the right group after all! Thanks to both a lot. I think I'm going to implement a prototype with matlab DSP toolbox first and then I'll do it in C or Java. Regards, S.
From: Jerry Avins on 24 May 2010 10:17
On 5/24/2010 9:38 AM, emitrax wrote: ... > Looks like I posted to the right group after all! "We do just about everything" (TM) > Thanks to both a lot. You're welcome. > I think I'm going to implement a prototype with matlab > DSP toolbox first and then I'll do it in C or Java. For pitch-shifting code, see http://www.dspdimension.com/ Jerry -- Engineering is the art of making what you want from things you can get. ����������������������������������������������������������������������� |