Multi-timbral percussion instrument having spatial convolution
AssigneeE-muSystems, Inc.
InventorDavid R. Frost
Life of this patent
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Abstract
An electronic sound processor creates reverberation effects using a simulated impulse function. The simulated impulse response is generated by combining frequency bands of white noise. The power of each band decays exponentially in time. The time constants are generated from the characteristics of a real or imaginary listening space. A reverberated sound signal is generated from an original sound signal by convolution of the original signal and the simulated impulse response. The method can adapted to generated stereophonic signals and to generate a forward and inverse reverb effect using only one set of multiplications.
Claims35
A multi-timbral instrument comprising
- means for creating a reverb impulse response, said means for creating a reverb impulse response comprising a noise signal generator for generating a noise signal, filter means for band-splitting the noise signal produced by said noise signal generator into a plurality of frequency bands each having a power amplitude, means for tapering the power amplitude of each of said bands to form tapered bands, said tapered bands having an initial decay section and a subsequent substantially constant power amplitude section, and means for combining said tapered bands to form said reverb impulse response, and
- means for spatially convolving said reverb impulse response with a dry sound to create a pure reverb version of aid dry sound.
In multi-timbral instrument, a method which comprises the steps of:
- creating a reverb impulse response, said creating step including the steps of generating a noise signal, band-splitting said noise signal into a plurality of frequency bands each of said bands having a power amplitude, tapering the power amplitude of each of said bands to provide tapered bands, each of said tapered bands having an initial decay section and a subsequent substantially constant power amplitude section, and combining said tapered bands to form said reverb impulse response, and
- spatially convolving said reverb impulse response with a dry sound to create a pure reverb version of said dry sound.
A multi-timbral instrument comprising
- means for creating a reverb impulse response, said means for creating said reverb impulse response comprising a noise signal generator for generating a noise signal, filter means for band-splitting the noise signal produced by said noise signal generator into a plurality of frequency bands each having a power amplitude, means for tapering the power amplitude of each of said bands to form tapered bands, and means for combining said tapered bands to form said reverb impulse response;
- means for spatially convolving said reverb impulse response with a first dry sound having a first pitch to create a pure reverb version of said dry sound, said pure reverb version of said dry sound having a playback rate such that a sound pitch of said pure reverb version of said dry sound is equal to said first pitch;
- means for altering said playback rate of said pure reverb version of said dry sound by a given factor to produce a pitch shifted pure reverb version of said dry sound having an envelope shape;
- and
- means for altering said envelope shape of said pitch shifted pure reverb version of said dry sound to produce a transposed pitch shifted pure reverb version of said dry sound.
Dependencies are inferred from the claim text.