![]() So we are likely to hear some amazing things in the near future using these techniques!ĥ.19 and Soundfile 5.20 are convolved into Soundfile 5.21. Simple-to-use convolution tools (like that in the program SoundHack) have only recently become available to a large community of musicians because up until recently, they only ran on quite large computers and in rather arcane environments. Surprisingly, by convolving any sound with white noise, we can simulateĪlthough reverberation is a common application of the convolution technique, convolution can be used creatively to produce unusual sounds as well. We "shot") by convolving the impulse response with that sound. Loud sound, we can place another sound in that room (at whatever position Response of a room (its resonant characteristics) using a very short, We described the way that, by recording what is called the impulse Digital audio effects using phase vocoder techniques are currently This information can be. Term which means that some aspect of one sound is imposed onto another.Ī simple example of cross-synthesis returns us to the subject of reverb. transients provide distinctive descriptions of the sounds content. SoundHack is a soundfile processing program, It performs many utility and esoteric sound processing functions available nowhere else. Cross-SynthesisĬonvolution is a type of cross-synthesis: a general, less technical Saw in Section 5.2, the mathematics of convolution can get a little hairy.īut the uses of convolution for transformations of sound are pretty straightforward, SoundHack measures the amplitude and phase for each frequency at the output of this filter bank. In this technique, the sound to be shifted is sent into a bank of band-pass filters which are evenly spaced from 0 Hz to half the sample rate. ![]() Inįact, as we mentioned, there is a well-known and surprisingly simple relationshipīetween these two concepts: multiplication in the time domain is the sameĪs convolution in the frequency domain (and vice versa). SoundHack provides pitch shifting without time scaling with a technique known as the phase vocoder. pitched melody which was a sample of a small 3 note performance treated in Soundhack with phase-vocoder and imported. A Four-Plugin Bundle exploring the classic Phase Vocoder and Granular Synthesis algorithms. This is different from simply multiplyingĮach value in one sound by its one corresponding value in another. SoundHack Pvoc Kit effect plugins bundle released Tom Erbe of SoundHack has released the Pvoc Kit, a new bundle of four plugins based on the Phase Vocoder in SoundHack and redesigned for real-time use. Remember that a convolution multiplies every frequencyĬontent in one sound by every frequency content in another (sometimesĬalled a cross-multiply). We have sonically turned the singers head into the guitar chord: hes singing "through" the chord. We talked about convolution a lot in our section on reverb (both in the time domain and in the frequency domain).Ī simple convolution: a guitar power chord (the impulse response), a vocal excerpt, and the convolution of one with the other. Chapter 5: The Transformation of Sound by Computer Section 5.5: More on ConvolutionĪnother interesting use of the phase vocoder is to perform convolution.
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