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 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. 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, 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).
This is different from simply multiplyingĮach value in one sound by its one corresponding value in another. 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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