Discrete Time Emulation of the Leslie Speaker

Date: 
Fri, 10/23/2009 - 2:15pm
Location: 
CCRMA Classroom
Event Type: 
DSP Seminar

For this week's DSP Seminar, Jorge Herrera will describe a discrete-time model of the Leslie speaker (abstract follows).  We will meet in the classroom at 2:15 PM.

Discrete Time Emulation of the Leslie Speaker
Jorge Herrera, Craig Hanson, and Jonathan S. Abel

A discrete-time emulation of the Leslie speaker acoustics is described. The midrange horn and subwoofer baffle are individually modeled, with their rotational dynamics separately tracked, and used to drive time-varying FIR filters applied to the input. The rotational speeds of the horn and baffle are approximated by first-order difference equations having different time constants for acceleration and deceleration. Several time-varying FIR filter methods were explored, all based on impulse responses tabulated over a dense set of horn and baffle angles. In one method, the input sample scales an interpolated impulse response at the current horn or baffle angle, which is added to the output. An example model of a Leslie 44W is presented.

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