[mus422] Fwd: CCRMA Colloq - John Princen - Monday 1/25 12:15 - 1:45

[Craig Sapp]

Hello Music 422 Class,

Here is the abstract of the special class held next Monday
during the CCRMA colloquia.

-=+Craig


---------- Forwarded message ----------
From: Sasha Leitman <sleitman at ccrma.stanford.edu>
Date: Fri, Jan 22, 2010 at 7:47 AM
Subject: CCRMA Colloq - John Princen - Monday 1/25 12:15 - 1:45
To: sleitman at ccrma.stanford.edu


Please join us for a CCRMA colloquium on Monday, January 25th.   John
Princen will
be giving a presentation  entitled, "Cosine Modulated Filterbanks and Bases – A
Historical Perspective."  An abstract for the talk and John Princen's bio can be
found below.


Who: John Princen
What: "Cosine Modulated Filterbanks and Bases – A Historical Perspective"
When: Monday, 1/25 12:15 - 1:45
Where: CCRMA Classroom 660 Lomita Ct., Stanford, CA 94305

Title: Cosine Modulated Filterbanks and Bases – A Historical Perspective.

Abstract: The problem of developing time-frequency representations has received
considerable attention in the Engineering, Mathematics and Scientific
literature.
Depending on the application, there are various properties of such a
representation
which are important. One of the most interesting and challenging problems is to
create a representation that is an orthogonal basis and has good time-frequency
localization. Such representations are incredibly useful in signal compression.

Until the latter part of the 1970's there were no known solutions to
this problem.
However, starting in the late 1970's, inspired by the development of Quadrature
Mirror Filters, researchers found first approximate, and then exact
solutions which
were both computationally efficient, and provided excellent time-frequency
localization. The development of solutions and extensions happened almost
simultaneously within the Signal Processing community, and the Mathematics
community, with some cross pollination of ideas, but in some cases completely
independently.  &#8232;&#8232;In this talk I will walk through the
historical development of the
particular class of computationally efficient solutions called Cosine Modulated
Filterbanks, or Local Cosine Bases, which have become ubiquitous in audio
compression. My goal is to provide a background to the problem, the
key ideas that
inspired solutions, and also point out the various dependent and independent
developments, partially disguised under different names, that are
essentially identical.

 Bio: John Princen graduated with a B. Eng. in Electrical Engineering
(1984), and an
M. Eng. in Digital Signal Processing (1986) from RMIT, Australia, and
a PhD in the
area of Computer Vision (1990) from the University of Surrey, UK.
Since then he has held positions at Telecom Australia Research Labs,
Bell Labs in
Murray Hill, and Silicon Graphics in Mountain View. He is currently a
Vice President
at BroadOn Communications Corp, Mountain View, CA where he directs a
team working on
hardware and software for consumer products. In the audio community he
is best known
for the development of what is now known as the MDCT. The MDCT is a core part of
many audio compression systems, including MP3, ATRAC, AC3 and AAC.