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Signal processing activities at the national technical University of Athens
463
Signal Processing4 (1982) 463 North-Holland PublishingCompany
PRESENTATION OF A EUROPEAN SIGNAL PROCESSING GROUP SIGNAL PROCESSING ACTIVITIES AT THE N A T I O N A L T E C H N I C A L U N I V E R S I T Y OF A T H E N S
History
Research projects
The group described here is working at the National Technical University of Athens (NTUA). The NTUA was established in the year 1836. The group was created in 1973 when Professor C.C. Halkias was elected to the chair of Electronics and moved to Athens from Columbia University in New York City.
(1) Seismic Signal Processing (under the responsibility of Prof. C.C. Halkias). Various modeling techniques are tested on real and artificial data. A new state space approach is used (see [1]). (2) Fast Algorithms and Spectral Estimation (under the responsibility of Dr. G. Carayannis). Most of the work in this area is carried out in collaboration between Dr. G. Carayannis, Dr. N. Kalouptsidis and Dr. Manolakis from the University of Athens. The research in this domain concerns the design of parametric signal processing fast algorithms and their application mainly to spectral analysis. Results obtained in this area have been presented in [2-5]. Forthcoming work is related to multichannel DSP fast algorithms, optimum lag Wiener filters and fast schemes for a-Toeplitz matrices. A spectral analysis package is elaborated containing most of the existing methods. A number of almost 20 methods are included. Extensive work concerning the comparison of the various methods is done but results are never published. (3) Speech Processing (under the responsibility of Dr. G. Carayannis). The principal interest in this area is speech compression systems. A number of classical predictive techniques is implemented and tested. The study of the greek language is another topic of interest and some work has been done in this area. (4) Speech Recognition (under the resPonsibility of Dr. G. Carayannis). Phoneme and
Staff and organization The teaching and research activities are directed by Professor C.C. Halkias. The following staff is involved to these activities: Dr. G. Carayannis, Dr. E. Kayafas, Dr. C. Mourikis, Mr. S. Kollias, Mr. E. Koukoutsis, Mr. G. Kambourakis. A number of students participate in the research activities. Among them: J. Ioannidis, T. Sellis, G. Yovanoff, L. Yasemidis, D. Lykourias, S. Bokamidis, B. Athanasopoulos, C. Daphermos.
Teaching activities The teaching activities cover the general Electronics field (Analog and Digital Electronics). A research and technical innovation oriented seminar is organized in parallel to the regular teaching activities. This seminar is open to graduate and post-graduate students.
0165-1684/82/0000-0000/$02.75 © 1982 North-Holland
464
Presentation of a European SignalProcessingGroup
continuous speech recognition is the main interest. Various clustering algorithms and time warping techniques are applied to speech. A method offered to a parallel processing implementation is now under consideration.
(5) Microprocessor Systems Derelopment (under the responsibility of Dr. E. Kayafas). The main purpose is the design of sophisticated systems for heating control resulting to significant economy in fuel.
Experimental facilities (1) Real Time Data Processing (liP 1000 System) 21 Mx E-Series Computer (256K bytes memory) Display Station Graphics Terminal Disk Drive (14.7M bytes) Tape Drive Card Reader A-to-D Converter System D-to-A Converter System Versatec Printer/Plotter Several Terminals
HP 2113A HP 2645A-015 HP 2648A HP 12962A HP 12970A HP 12986A HP 91000A HP 12555B Versatec 1640-8
Real Time Operating System (RTE Instrument Drive Version)
RTE IV
(2) Digital Signal Analysis FFT Digital Signal Analyzer (with HP-IB Interface) FM Portable Tape Recorder
HP 5420-A Bruel & Kjaer 7003
(3) Microprocessor Development System Tektronix (Microprocessors 8080, 8085 with BASIC Compiler, 64K Memory) Microprocessor Laboratory Signature Analyzer Motorola Exorciser System HP Logic State Analyzer
MDS 8002 HP 5036A(10 units) HP 1009 M 6800-SDT-1512 HP 1611A option 068
Major contributions [1] S.D. Kollias and C.C. Halkias, "Modelingand spectral estimation methods in the deconvolutionof seismic signals", Spectrum Estimation Workshop, Imperial College, England, April 1982. Signal Processing
[2] G. Carayannis,N. Kalouptsidisand D. Manolakis,"Fast recursivealgorithmsfor a classof linearequations",IEEE. Trans.Acoust. SpeechlSignalProcess.,Vol.30, No. 2, April 1982, pp. 227-239.
465
Presentation of a European Signal Processing Group [3] N. Kalouptsidis, G. Carayannis and D. Manolakis, "On block matrices with elements of special structure", Proc. 1982 Int. Conf. Acoust. Speech Signal Process., Paris, May 1982, pp. 1744-1747. [4] D. Manolakis, N. Kalouptsidis and G. Carayannis, "'Efficient determination of FIR Wiener filters with linear phase", Electronic letters, Vol. 18, No. 10, May 1982, pp. 429-431. [5] C.C. Halkias, G. Carayannis, J. Dologlou and D. Emmanoulopoulos, "A new generalized recursion for the fast computation of the Kalman gain to solve the covari-
ance equations", Proc. 1982 Int. Confi Acoust. Speech Signal Process., Paris, May 1982, pp. 1760-1763.
For f u r t h e r i n f o r m a t i o n , please contact N a t i o n a l T e c h n i c a l U n i v e r s i t y of A t h e n s , Chair of Electronics, 42, Patission Ave., A t h e n s (147), G r e e c e . Tel: (301) 3 6 0 5 6 0 4 or 3 6 0 0 5 5 1 .
Vol.4, Nos.5-6,October1982
Signal Processing4 (1982) 463 North-Holland PublishingCompany
PRESENTATION OF A EUROPEAN SIGNAL PROCESSING GROUP SIGNAL PROCESSING ACTIVITIES AT THE N A T I O N A L T E C H N I C A L U N I V E R S I T Y OF A T H E N S
History
Research projects
The group described here is working at the National Technical University of Athens (NTUA). The NTUA was established in the year 1836. The group was created in 1973 when Professor C.C. Halkias was elected to the chair of Electronics and moved to Athens from Columbia University in New York City.
(1) Seismic Signal Processing (under the responsibility of Prof. C.C. Halkias). Various modeling techniques are tested on real and artificial data. A new state space approach is used (see [1]). (2) Fast Algorithms and Spectral Estimation (under the responsibility of Dr. G. Carayannis). Most of the work in this area is carried out in collaboration between Dr. G. Carayannis, Dr. N. Kalouptsidis and Dr. Manolakis from the University of Athens. The research in this domain concerns the design of parametric signal processing fast algorithms and their application mainly to spectral analysis. Results obtained in this area have been presented in [2-5]. Forthcoming work is related to multichannel DSP fast algorithms, optimum lag Wiener filters and fast schemes for a-Toeplitz matrices. A spectral analysis package is elaborated containing most of the existing methods. A number of almost 20 methods are included. Extensive work concerning the comparison of the various methods is done but results are never published. (3) Speech Processing (under the responsibility of Dr. G. Carayannis). The principal interest in this area is speech compression systems. A number of classical predictive techniques is implemented and tested. The study of the greek language is another topic of interest and some work has been done in this area. (4) Speech Recognition (under the resPonsibility of Dr. G. Carayannis). Phoneme and
Staff and organization The teaching and research activities are directed by Professor C.C. Halkias. The following staff is involved to these activities: Dr. G. Carayannis, Dr. E. Kayafas, Dr. C. Mourikis, Mr. S. Kollias, Mr. E. Koukoutsis, Mr. G. Kambourakis. A number of students participate in the research activities. Among them: J. Ioannidis, T. Sellis, G. Yovanoff, L. Yasemidis, D. Lykourias, S. Bokamidis, B. Athanasopoulos, C. Daphermos.
Teaching activities The teaching activities cover the general Electronics field (Analog and Digital Electronics). A research and technical innovation oriented seminar is organized in parallel to the regular teaching activities. This seminar is open to graduate and post-graduate students.
0165-1684/82/0000-0000/$02.75 © 1982 North-Holland
464
Presentation of a European SignalProcessingGroup
continuous speech recognition is the main interest. Various clustering algorithms and time warping techniques are applied to speech. A method offered to a parallel processing implementation is now under consideration.
(5) Microprocessor Systems Derelopment (under the responsibility of Dr. E. Kayafas). The main purpose is the design of sophisticated systems for heating control resulting to significant economy in fuel.
Experimental facilities (1) Real Time Data Processing (liP 1000 System) 21 Mx E-Series Computer (256K bytes memory) Display Station Graphics Terminal Disk Drive (14.7M bytes) Tape Drive Card Reader A-to-D Converter System D-to-A Converter System Versatec Printer/Plotter Several Terminals
HP 2113A HP 2645A-015 HP 2648A HP 12962A HP 12970A HP 12986A HP 91000A HP 12555B Versatec 1640-8
Real Time Operating System (RTE Instrument Drive Version)
RTE IV
(2) Digital Signal Analysis FFT Digital Signal Analyzer (with HP-IB Interface) FM Portable Tape Recorder
HP 5420-A Bruel & Kjaer 7003
(3) Microprocessor Development System Tektronix (Microprocessors 8080, 8085 with BASIC Compiler, 64K Memory) Microprocessor Laboratory Signature Analyzer Motorola Exorciser System HP Logic State Analyzer
MDS 8002 HP 5036A(10 units) HP 1009 M 6800-SDT-1512 HP 1611A option 068
Major contributions [1] S.D. Kollias and C.C. Halkias, "Modelingand spectral estimation methods in the deconvolutionof seismic signals", Spectrum Estimation Workshop, Imperial College, England, April 1982. Signal Processing
[2] G. Carayannis,N. Kalouptsidisand D. Manolakis,"Fast recursivealgorithmsfor a classof linearequations",IEEE. Trans.Acoust. SpeechlSignalProcess.,Vol.30, No. 2, April 1982, pp. 227-239.
465
Presentation of a European Signal Processing Group [3] N. Kalouptsidis, G. Carayannis and D. Manolakis, "On block matrices with elements of special structure", Proc. 1982 Int. Conf. Acoust. Speech Signal Process., Paris, May 1982, pp. 1744-1747. [4] D. Manolakis, N. Kalouptsidis and G. Carayannis, "'Efficient determination of FIR Wiener filters with linear phase", Electronic letters, Vol. 18, No. 10, May 1982, pp. 429-431. [5] C.C. Halkias, G. Carayannis, J. Dologlou and D. Emmanoulopoulos, "A new generalized recursion for the fast computation of the Kalman gain to solve the covari-
ance equations", Proc. 1982 Int. Confi Acoust. Speech Signal Process., Paris, May 1982, pp. 1760-1763.
For f u r t h e r i n f o r m a t i o n , please contact N a t i o n a l T e c h n i c a l U n i v e r s i t y of A t h e n s , Chair of Electronics, 42, Patission Ave., A t h e n s (147), G r e e c e . Tel: (301) 3 6 0 5 6 0 4 or 3 6 0 0 5 5 1 .
Vol.4, Nos.5-6,October1982