2007 Winter Symposium: Tutorials

Saturday, January 6, 10:15-11:00am

Dynamically Programmable ASP
Simon Dickinson, Anadigm
Simon Dickinson, COO of Anadigm will present Anadigm’s SonicMaster family - an advanced subwoofer signal processing module solution for quickly upgrading existing subwoofer plate amplifier designs with an enhanced feature set that allows for state-of-the art subwoofers with minimal cost and negligible product development. Anadigm’s audio dpASP (dynamically programmable Analog Signal Processor) embedded into SonicMaster provides a programmable platform for your subwoofer signal conditioning enabling equalization, band-pass filtering and amplifier clipping and woofer bottoming limiter protection to an active subwoofer design. Such a platform also enables audiophile class- “all analog” AutoEQ processing.The SonicMaster family is preprogrammed, allowing for an out of the box solution that is very cost effective compared to digital DSP solutions and much more flexible then discrete analog.

Saturday, January 6, 11:05-11:50am
Rub & Buzz Measurement

Ib Rasmussen, K&K International
Ib Rasmussen will discuss Rub & Buzz measurement using the P630 test system. It will introduce the types of Rub & Buzz and how they are generated, and explain why it causes problems in a production environment. It will cover the test parameters that need to be measured, the different types of measurement signal that can be used, and the difference between THD and Rub & Buzz. It will demonstrate how to set up a Rub & Buzz test using a P630 and discuss typical problems of making these measurements in a production environment.

Sunday, January 7, 8:30-9:15am
Objective and Perceptual Method of Assessment of Nonlinearity in Loudspeakers
Alex Voishvillo, JBL Professional
This tutorial will discuss recent perceptual models created specifically for the assessment of nonlinearity in transducers. These new methods will be compared with other methods and the prospects for future developments discussed. The tutorial discusses three different approaches to the measurement of nonlinearity: objective measurements of the ‘symptoms’ of nonlinearity (THD, two-tone IM distortion, reaction to multitone, coherence function, etc.), nonlinear identification, and perceptual models.