It turns out that a robust, simple, flexible and easy to understand protocol already exists and has been in use for almost 50 years: the 1v/oct standard. In fact all of my current monome work is now a subset of Beap including favorites like Plane and Polygome. In that time it has grown to encompass many themes of my past interests - especially my monome work.
#Max msp vocoder Patch#
If you look around online you'll find a few of them. Ideally, you want the freedom to attach a patch cord from anywhere to anywhere without worrying about what kind of message is flowing down the patch cord.īeap has been underway for almost a year now. The idea of a higher level Max patching system that emulates synthesis modules is not a new or unique idea. The Beap library is a collection of modules that emulate the function and signaling of hardware modular synthesizers. The idea behind the Sliding Discrete Fourier Transform (SDFT) is to make use of the known values of 2 to calculate the value for the next window.What was your inspiration for the BEAP devices? I've heard that you developed them for academic use?īeap was developed as a pedagogical tool for the Electronic Production and Design students at Berklee College of Music in Boston. In the traditional implementation the window is moved on / by samples, usually /10+ with, and the DFT is recalculated. operations to calculate for a window of size. uses a divide-and-conquer method and costs +*. Finally we assess the quality of transformations based on the SDFT in a Csound implementation. We also propose a much more efficient Simple Sliding Inverse DFT that makes sliding a serious alternative to jumping between overlapping frames. In this paper we review the mathematical background, and implementation issues, and then consider the advantages and disadvantages of the Sliding Discrete Fourier Transform (SDFT) as compared with a more traditional FFT algorithm. The existence of the sliding DFT has been known for some time, but it does not seem to be in wide use, possibly because of its perceived computational cost. The main problems for pitch shifting with envelope preservation in a phase vocoder are identified and a simple yet efficient remedy is proposed. The application of the true envelope estimator in a pitch shifting application is investigated.
The resulting implementation of the algorithm has slightly increased computational complexity compared to the standard LPC algorithm but offers significantly improved control over the envelope characteristics. As a remedy for the ringing effects in the the spectral envelope that are due to the rectangular filter used for spectral smoothing we propose the use of a Hamming window as smoothing filter. By means of controlled sub-sampling of the log amplitude spectrum and by means of a simple step size control for the iterative algorithm the run time of the algorithm can be decreased by a factor of 2.5-11. As the most promising algorithm the cepstrum based iterative true envelope estimator is selected.
As a first step the different existing envelope estimation algorithms are investigated and their specific properties discussed.
The intended application for the developed algorithm is pitch shifting with preservation of the spectral envelope in the phase vocoder.
In this article the estimation of the spectral envelope of sound signals is addressed.
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