ADVANCES
IN CIRCUITS AND SYSTEMS 5, August 2005
A
quarterly news service of the IEEE Circuits and Systems Society
Editor:
Martin Hasler VP Technical Activities
CONTENTS
- Blind Source Separation of Convolutive
Mixtures of Audio Signals in Frequency Domain
- Pinning a Complex Dynamical Network to its Equilibrium (2005 Guillemin-Cauer Award)
- Almost exponential reduction in digital test data volume and test
time (2005 Donald Pederson Award)
- Digital RF Processing: Toward Low-Cost Reconfigurable Radios
- Phase-Locked Loop Jitter due to Power/Ground and Substrate Noise
(2005 Darlington Award)
1. Blind Source Separation of Convolutive Mixtures of Audio Signals in Frequency Domain
Description by Shoji Makino: Frequency-domain
BSS performs independent component analysis (ICA) in each frequency bin,
and this is more efficient than time-domain BSS. We describe a sophisticated
total solution for frequency-domain BSS, including permutation, scaling,
circularity, and complex activation function solutions. Experimental
results of separating audio signals for the cases of 2x2, 3x3, 4x4,
6x8, and 2x2 (moving sources), (#sources x #microphones) in a room are
promising.
References:
1. H.
Sawada, R. Mukai, S. Araki, and S. Makino, ``A robust and precise method
for solving the permutation problem of frequency-domain blind source
separation,'' IEEE Trans. Speech Audio Processing, vol.12,pp. 530--538,
Sept. 2004.
2. H.
Sawada, R. Mukai, S. Araki, and S. Makino, ``Frequency-domainblind source
separation,'' in Speech Enhancement, J. Benesty, S. Makino, and J. Chen,
Eds., Springer, Mar. 2005.
Communicated by the Technical Committee on Blind Signal Processing
2. Pinning a Complex Dynamical Network to its
Equilibrium (2005 Guillemin-Cauer Award)
Description by the authors: Control of
complex networks with stabilization conditions has been studied in this
paper for both random networks and scale-free networks. The concept
of virtual control for microscopic dynamics is proposed to explain the
process with different pinning schemes for different networking topologies.
The synchronization phenomenon of controlled dynamical networks in the
stabilization process is also investigated, both analytically and numerically.
Reference: X.
Li, X. Wang, and G. Chen, "Pinning a Complex Dynamical Network to its
Equilibrium," IEEE Trans. on Circuits and Systems I, vol. 51, no. 10,
pp. 2074-2087, Oct. 2004.
Communicated by the Technical
Committee on Nonlinear Circuits and Systems
3. Almost exponential reduction in digital test
data volume and test time (2005 Donald Pederson Award)
Descriptions by Alan
Mantooth: X-Compact is a breakthrough solution to a two-decade old
open problem in digital test - exponential reduction in test response
data and test time despite the presence of unknown logic values (X's).
A signal has unknown logic value X when the simulator cannot determine
whether the correct value should be 0 or 1. X-Compact has been implemented
in several industrial designs.
Reference: Subhasish
Mitra and Kee Sup Kim, “X-compact: An Efficient Response Compaction
Technique”, IEEE Trans. on Computer-Aided Design of Integrated Circuits
and Systems, Vol. 23, No. 3, pp. 421- 432, March 2004.
Communicated by the Technical Committee on Computer-Aided Network
Design
4. Digital
RF Processing: Toward Low-Cost Reconfigurable Radios
Description by Magdy Bayoumi: This paper
addresses the standard question: when to digitize in communication systems?
Should it be ASAP (as soon as possible), ALAS (as late as possible),
or somewhere in between? Several parameters will lead to the right answer;
complexity, application, used technology, and market. The RF unit is
implemented in analog most of the time. This paper introduces an alternative
digital implementaion.
Reference: K. Muhammad, R. B. Staszewski,
and D. Leipold, “Digital RF Processing: Toward Low-Cost Recongigurable
Radios”, IEEE Communications Magazine, Aug. 2005, Vol. 43, #8, pp. 105-113.
Link not yet available.
Communicated by the Technical Committee on Circuits and Systems
for Communications
5. Phase-Locked
Loop Jitter due to Power/Ground and Substrate Noise (2005 Darlington Award)
Description by Payam Heydari: This paper
is the first article that presents a comprehensive study of the supply
and substrate noise effects on the phase-locked loop (PLL) jitter.
Reference: P.Heydari,
“Analysis of the PLL Jitter Due to Power/Ground and Substrate Noise”,
IEEE Transactions on Circuits and Systems I, vol. 51, no.12, pages 2404-2416,
December 2004.
Communicated by the Technical Committee on Analog Signal Processing