Paper•
on September 12th, 2007•
You can download and view the paper here.
Abstract—The shift operator, q, and the z-transform are used extensively in filter design. However, techniques involving forward shifts do not have sensible continuous-time counterparts. The delta operator and its corresponding transform, alternatives to the previous methods, converge to the underlying continuous- time result as the sampling period goes to zero. This unifies continuous and discrete time theory. It has also been shown mathematically that the delta operator is numerically superior to the shift operator. This document will examine the delta operator and its transform.
Paper•
on September 12th, 2007•
You can download the paper here.
Abstract—Finite impulse response filters are highly desirable in digital filter design because of their inherent stability and linear phase. However, when narrow transition band characteristics are required, they typically have a much higher filter order than their infinite impulse response counterparts with equivalent magnitude spectrums. This paper will investigate many types of finite impulse resposne filter designs, including those that attempt to reduce the filter order, and therefore, computational complexity. Actual examples and implementations will accompany most methods.
Paper•
on September 12th, 2007•
This is the paper that accompanied my poster and demo at HAID ‘09 (Haptic and Audio Interaction Design). You may see a picture of it in action and actually download the Mac OS X Audio Unit here.
You may view the complete paper here.
Abstract – We present a method for combining computer vision techniques with audio effect parameter control. In particular, we focus on tracking a user’s head position relative to the ca- mera and using this as a control signal for real-time audio effects processing and editing on digital audio workstations. The computer-vision techniques used are robust and use readily available, inexpensive tools, allowing our implementation to be used as an editing tool for audio engineers and composers, a component of larger interactive multimedia installations, and other applications. A test case is presented that utilizes OpenCV and Mac OS X Audio Units to control a resonant lowpass filter in real time.
