P.O. Box 13455

Minneapolis, MN 55414

(612) 617-0366

4-174 EE/Csci Building

200 Union Street SE

Minneapolis, MN 55455

Phone: (612) 624-5285

Fax: (612) 625-4583

Signal processing for multimedia systems and databases, audio coding, time-scaling of audio signals, multiscale signal processing, statistical signal processing, auditory modeling, data modeling, watermarking and data hiding.

1/94 – present University of Minnesota, Minneapolis, MN

Ph. D. Candidate in Electrical Engineering

Advisor: Professor Ahmed Tewfik

Thesis Title: Coding and Time-Scaling of Audio Signals for Multimedia Applications

9/89 – 5/91 University of Michigan, Ann Arbor, MI

M.S.E. Electrical Engineering (Systems)

Major Area: Signal processing Minor Area: Control

Research Area: Signal processing for ultrasound imaging systems

9/84 – 5/88 University of Colorado, Boulder, CO

B.S. Electrical Engineering and Computer Science with honors

1/94 – present University of Minnesota, Minneapolis, MN

Research Assistant, Multiscale Signal Processing Group

Using joint sinusoidal and wavelet modeling techniques for modeling audio and coding of CD quality audio signals. Developing new method to extract sinusoidal components from audio signals. Developing algorithm for the time-scale modification of digital audio signals. Developed technique to extract rhythmic patterns from audio signals. Worked on algorithm for the watermarking of digital audio signals.

7/96 – 9/96 Lucent Technologies – Bell Laboratories, Murray Hill, NJ

Member of Technical Staff

Developed algorithm for generating pseudostereo signals from monophonic digital audio signals. Investigated previous techniques used for analog audio recordings and the use of HRTF’s for pseudostereo applications. Studied the problems associated with generating pseudostereo effects over headphones and over speakers.

7/90 – 5/91 University of Michigan, Ann Arbor, MI

Research Assistant, Ultrasound and Medical Imaging Laboratory

Applied signal processing techniques to increase the depth of focus of linear phased arrays for ultrasonic imaging applications. Designed programs for simulating the ultrasound field patterns.

3/92 – 8/93 Tetrad Corporation, Greenwood Village, CO

Staff Engineer

Designed a waveform generator and test fixture to automate transducer array testing. Wrote software for transducer characterization experiments. Wrote software to gather 3-D ultrasound image data sets to be used for volume rendering. Designed PCB, for and ISA bus, to interface between a 486 motherboard and several daughterboards, each of which contains a Motorola DSP56001, for and ultrasound imaging system. Designed test procedure for the PCB. Tested and debugged PCB and its associated software. Designed interface for an LCD display and membrane keyboard for control panel of the ultrasound imaging system.

6/88 – 8/89 Texas Instruments, Defense Systems and Electronics Group, Colorado Springs, CO

Electrical Design Engineer

Tested, debugged and redesigned the digital controller boards of an emitter location system using TTL, CMOS, and PAL devices. Defined the design corrections. Supervised the layout, assembly, and testing of the new PCB's. Specified test parameters for PCB's and helped debug test equipment software. Worked with the manufacturing group to insure that the PCB's were buildable. Worked with the QRA group to insure that the designs satisfied all required military specifications. Assisted the customer representative in writing a training manual for the system.

1/94 – present University of Minnesota, Minneapolis, MN

• Real-Time Signal Processing Laboratory – instructed students in the use of the Motorola DSP 56001 for the real-time implementation of FIR filters, adaptive filters, multi-rate filters, and a Differential PCM encoder/decoder system
• Digital Signal Processing
• Digital Communications Lab– instructed students in communications experiments, involving PCM, quantization, TDM, PSK, FSK
• Electrical Circuits
• Circuits Laboratory – taught circuits laboratory designed for non-EE majors.
• Senior Design Laboratory

7/90 – 5/91 University of Michigan, Ann Arbor, MI

• Digital Signal Processing – taught DSP laboratory that was required in the course. Assisted professor with selection of homework assignments. Prepared and gave several lectures when professor was out of town.
• Circuit Analysis and Electronics Laboratory – taught circuits laboratory designed for non-EECS majors.

K. Hamdy and A. Tewfik, "Audio Coding Using Steady State Harmonics and Residuals", submitted to 1999 International Workshop on Multimedia Signal Processing, Copenhagen, Denmark.

K. Hamdy, A. Tewfik, T. Chen, and S. Takagi, "Time-Scale Modification of Audio Signals with Combined Harmonic and Wavelet Representations," ICASSP-97, Munich, Germany.

K. Hamdy, M. Ali, and A. Tewfik, "Low Bit Rate High Quality Audio Coding with Combined Harmonic and Wavelet Representations," ICASSP-96, Atlanta, GA.

L. Boney, A. Tewfik, and K. Hamdy, "Digital Watermarks for Audio Signals," EUSIPCO-96, VIII European Signal Proc. Conf., Trieste, Italy, September 1996.

L. Boney, A. Tewfik, and K. Hamdy, "Digital Watermarks for Audio Signals," IEEE International Conference on Multimedia Computing and Systems, Hiroshima, Japan, June 1996.

"Method And Apparatus For Embedding Invisible Data, Including Watermarks, In Images, Sounds and Video," Ahmed Tewfik, Mitchell Swanson, Bin Zhu, Laurence Boney, Khaled Hamdy, patent pending.

High Level Languages: C, C++, Java, Matlab, Pascal, FORTRAN, HTML, SQL

Assembly Languages: Intel 80x86, Motorola DSP 56001

Selected Software: LaTeX, Mathematica, VoxBlast AT, VIEWlogic/Workview

• Reviewer for Transactions on Speech and Audio Processing