Helium Voice effect algorithm
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From: Ikaro on 25 May 2010 08:27 If you are looking for a method that does not alter the pitch and is has flexible mapping I suggest also: "Discrimination of speech processed by low-pass filtering and pitch- invariant frequency lowering", Reed, Hick, Braida, and Durlach,J. Acoust. Soc. Am, 74(2), August 1983 With the warping being related to all pass filters as described in : "Discrete representation of signals", Oppenheim, Johnson, Proc. IEEE, 60, 1972 -ikaro On May 24, 10:17 am, Jerry Avins <j...(a)ieee.org> wrote: > 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, seehttp://www.dspdimension.com/ > > Jerry > -- > Engineering is the art of making what you want from things you can get. > ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
From: Vladimir Vassilevsky on 25 May 2010 08:56 emitrax wrote: > Hi, > 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 am looking for a project to learn mechanical engineering, and I have an idea of implementing a Space Shuttle. > So I'm wondering if any of you have any lecture to point me to? Get a basic book such as "Understanding DSP" by Rick Lyons and prepare for several years of learning. VLV
From: robert bristow-johnson on 25 May 2010 09:36
On May 24, 7:38 am, "igor b." <i...(a)REMOVEhyperglitch.com> wrote: > On 24.05.2010 12:36, emitrax wrote: > > > > > 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 effect is basically shifting up the pitch of a voice. Probably > easiest way to do it is with phase vocoder. easier than the phase vocoder is a time-domain method based on Lent's algorithm (Computer Music Journal, Winter 1989). check out US patents 5641926 and 6336092. this time-domain method works only on a single voice (a quasi-periodic signal) and needs a good pitch detector. this has been done before. Roland used to have this little box called a "voice transformer". r b-j |