DIRAC Version 2.2 Available
December 8th, 2009 – The DSP Dimension is proud to present version 2.2 of its critically acclaimed DIRAC2 time stretching and pitch shifting software that enables developers to include the ability to change the speed and pitch of voice, instruments and music in their applications. Version 2.2 fixes the following issues and is a recommended for all users of the software on all platforms:
v2.2.0 [0912080900]
- Fixed volume offset for certain quality/lambda settings
- Fixed excessive bass and DC response for frequencies < 20Hz
- Fixed bug that caused the formant scaling to be always reciprocal to pitch in STUDIO
- Optimized kDiracLambda1 (voice mode)
The new version of the free LE variant is available from the DSP Dimension download page at http://www.dspdimension.com/download/
Releasing DIRAC2 Version 2.1 With Pitch Correction
November 9th, 2009 — The DSP Dimension is happy to announce version 2.1 of DIRAC. Version 2.1 is available for download as of today and fixes several bugs that could affect performance and precision. Most importantly, polyphonic formant correction could produce unpredictable results with previous versions and pitch shifting could sometimes affect the length of the processed audio. All these bugs are fixed in version 2.1 and due to popular demand we have upgraded and re-enabled pitch correction in the latest version. DIRAC LE on all platforms offers pitch correction on a equitempered scale while the PRO version adds support for arbitrary tuning tables and direct pitch manipulation. Please see the README file that comes with DIRAC and the DIRAC product page for more information.
DIRAC v2 Public Beta for the iPhone Available
Mainz, Germany, October 5th, 2009 — We are happy to announce the first public beta of the new DIRAC version 2 for the iPhone. Over the past few weeks, we have received numerous requests for an iPhone version of our DIRAC time stretch/pitch shift technology, since Apple is not providing their AUTimePitch AudioUnit for the iPhone. Until now, iPhone developers had to use their own methods to change pitch and speed of audio signals independently, as no commercial grade solution was available.
As of today, DIRAC v2 for the iPhone is in public beta test and we expect to release support for its full range of platforms this week. The LE version will continue to be free and all versions will be available for Windows, MacOS X, Linux and the iPhone. Upgrades for existing 1.x licenses will also be available.
For general information on the product please visit our DIRAC page at http://www.dspdimension.com/technology-licensing/dirac2/ which will also be updated to version 2 soon. Version 2 offers increased speed, a better preview mode, better formant correction, iPhone support, 64bit support and is now ANSI C callable.
If you want to participate in the beta test and download a fully functional beta version of the free LE version right now you can do so from http://beta.dspdimension.com/iPhoneTest.zip (please see the license agreement that comes with the archive). Please contact us with any questions or problems that you might have via our contact form.
ActionScript3 Version of smbPitchShift Available
Mainz, August 27th, 2009 – Arnaud Gatouillat has posted an ActionScript3 port of our smbPitchShift code from the “Pitch Shifting Using the Fourier Transform” tutorial on his web site at http://iq12.com/blog/2009/08/25/real-time-pitch-shifting/. If you have Flash 10 installed on your computer you can run it directly off his web site in real time. Source code is also available.
Prosoniq Morph – Behind the scenes
Stephan M. Bernsee talks about developing the Prosoniq morph plug in
by Reinhard G. Benedikt November 1st, 2003, translated by Eva Remowa
How did you come to develop the morph plug in?
Well, I began thinking about such an application shortly after I visited Peter Gabriel at Realworld studios where I was introducing the Neuron synthesizer. They needed a way to seamlessly morph from one sound to another for a television production they were working on. It turned out that the Neuron was capable of doing this, but it is certainly not a good idea to purchase a Mercedes when you just need an easy way to get from point A to point B. So I figured that many people might need such a tool and so we began tossing around the idea of doing a real time morphing plug in. As it turns out, the Prosoniq morph has the potential to be one of our most successful products. Read more
Pitch Shifting Using The Fourier Transform
With the increasing speed of todays desktop computer systems, a growing number of computationally intense tasks such as computing the Fourier transform of a sampled audio signal have become available to a broad base of users. Being a process traditionally implemented on dedicated DSP systems or rather powerful computers only available to a limited number of people, the Fourier transform can today be computed in real time on almost all average computer systems. Read more
The DFT “à Pied”: Mastering The Fourier Transform in One Day
If you’re into signal processing, you will no doubt say that the headline is a very tall claim. I would second this. Of course you can’t learn all the bells and whistles of the Fourier transform in one day without practising and repeating and eventually delving into the maths. However, this online course will provide you with the basic knowledge of how the Fourier transform works, why it works and why it can be very simple to comprehend when we’re using a somewhat unconventional approach. Read more
Time Stretching And Pitch Shifting of Audio Signals – An Overview
This tutorial gives a brief overview of the most popular algorithms used for achieving time stretching and pitch shifting in a musical context, along with their advantages and disadvantages. We provide audio examples to demonstrate common artifacts and effects associated with these processes, and provide pointers to papers and other resources on the net. Read more