Educational background:

• Univ. Federal do Rio de Janeiro (UFRJ), BSEE, Electrical Engineering, 1987.
• Pontificia Univ. Catolica do Rio de Janeiro (PUC-RJ), M.S., Electrical Engineering, 1990.
• Univ. of California, Los Angeles (UCLA), Ph.D., Electrical Engineering, 1998.
• Undergraduate final project: An Image Acquisition System for PC Compatibles.
• M.S. thesis: Analysis and Synthesis of Recursive Digital Filters Free from Limit Cycle.
• Ph.D. dissertation: On the Analysis of Adaptive Filtering Algorithms and Their Application to Spectral and Direction-of-Arrival Estimation.

Current research interests:

• Audio, image and video coding and processing
• Source separation and Independent Component Analysis
• Acoustic echo cancellation, acoustic feedback cancelation, noise reduction
• Microphone arrays: 3D speaker localization, speech enhancement, beamforming
• Adaptive filtering algorithms
• Conjugate Gradient method of optimization
• Spectral estimation
• Array signal processing: Beamforming, DOA estimation, subspace tracking
• Embedded Systems: multi-core programming, real-time algorithm implementation

Lecture Notes (Dept. of Computer Engineering, Santa Clara University):

• COEN338: Multimedia Data Compression I (image & video compression), Winter 2003
• COEN339: Multimedia Data Compression II (audio & speech compression), Spring 2005

Patents:

• 6469732: Acoustic Source Location Using A Microphone Array, U.S. Patent no. US 6469732 B1, 10/22/2002.
• 6618073: Apparatus and Method for Avoiding Invalid Camera Positioning in a Video Conference , U.S. Patent no. US 6618073 B1, 09/09/2003.
• 2009/0087113: Variable Length Coding of Coefficient Clusters for Image and Video Compression, U.S. Patent filed in 02/13/2008, serial no. 12/030,821.
• 2009/0087109: Reduced Code Table Size in Joint Amplitude and Position Coding of Coefficients for Video Compression, U.S. Patent filed in 02/13/2008, serial no. 12/030,794.
• 2009/0086815: Context Adaptive Position and Amplitude Coding of Coefficients for Video Compression, U.S. Patent filed in 01/18/2008, serial no. 12/016,441.
• 2008/0170613: Breakpoint Determining for Hybrid Variable Length Coding and Encoding the Determined Breakpoint, U.S. Patent filed in 12/20/2007, serial no. 11/961,795.
• 2009/0016440: Position Coding for Context-Based Adaptive Variable Length Coding, U.S. Patent filed in 07/09/2007, serial no. 11/774,745.
• 2008/0170625: Per Block Breakpoint Determining for Hybrid Variable Length Coding, U.S. Patent filed in 03/15/2007, serial no. 11/686,778.
• 2008/0181296: Per Multi-Block Partition Breakpoint Determining for Hybrid Variable Length Coding, U.S. Patent filed in 03/15/2007, serial no. 11/686,860.
• 2008/0181299: Breakpoint Determining for Hybrid Variable Length Coding Using Relationship to Neighboring Blocks, U.S. Patent filed in 03/15/2007, serial no. 11/686,898.

Publications:

• ICCCN 2008: J. Li, G. AlRegib, D. Tian, P. S. Chang, and W. Chen, �3-D Position and Amplitude VLC Coding in H.264/AVC,� Workshop presented at 17th Int. Conf. on Comp. Comm. And Networks, ICCCN 2008, St. Thomas, U.S. Virgin Islands, pp. 1-5, Aug. 2008.
• ICIP 2008: J. Li, G. AlRegib, D. Tian, P. S. Chang, and W. Chen, �Three-Dimensional Position and Amplitude VLC Coding in H.264/AVC,� Proc. IEEE Int. Conf. on Image Processing, San Diego, pp. 2488-2491, Oct. 2008.
• ICASSP 2008: J. Li, G. AlRegib, D. Tian, P. S. Chang, and W. H. Chen, �Joint Position and Amplitude Coding in Hybrid Variable Length Coding for Video Compression,� to appear in Proc. IEEE Int. Conf. Acoust., Speech, Signal Processing, Las Vegas, pp. 1053-1056, Mar. 2008.
• ICIP 2007: D. Tian, P. S. Chang, W. Chen, �Hybrid Variable Length Coding in Video Compression Using Variable Breakpoint,� Proc. IEEE Int. Conf. on Image Processing, San Antonio, vol. III, pp. 413-416, Sep. 2007.
• ICASSP 2007: D. Tian, W. Chen, P. S. Chang, G. AlRegib, and R. M. Mersereau, "Hybrid Variable Length Coding for Image and Video Compression," Proc. IEEE Int. Conf. Acoust., Speech, Signal Processing, Hawaii, pp.1133-1136, Apr. 2007.
• Trans. on SP: P. S. Chang and A. N. Willson, Jr., "Analysis of Conjugate Gradient Algorithms for Adaptive Filtering," IEEE Trans. on Signal Processing, vol. 48, pp. 409-418, Feb. 2000.
• Asilomar 1997: P. S. Chang and A. N. Willson, Jr., "Performance of 3D Speaker Localization Using a Small Array of Microphones," Proc. 31st Asilomar Conf. on Signals, Systems and Comp., Pacific Grove, pp. 328-332, Nov. 1997.
• ISCAS 1997: P. S. Chang and A. N. Willson, Jr., "Analysis of Conjugate Gradient Algorithms for Adaptive Filtering," Proc. IEEE Int. Symp. on Circuits and Systems, Hong Kong, pp. 2292-2295, Jun. 1997.
• ICASSP 1997: P. S. Chang and A. N. Willson, Jr., "Conjugate Gradient Method for Adaptive Direction-of-Arrival Estimation of Coherent Signals," Proc. IEEE Int. Conf. Acoust., Speech, Signal Processing, Munich, pp. 2281-2284, Apr. 1997.
• ICASSP 1996: P. S. Chang and A. N. Willson, Jr., "Adaptive Spectral Estimation Using the Conjugate Gradient Algorithm," Proc. IEEE Int. Conf. Acoust., Speech, Signal Processing, Atlanta, pp. 2979-2982, May 1996.
• Asilomar 1995: P. S. Chang and A. N. Willson, Jr., "A Roundoff Error Analysis of the Normalized LMS Algorithm," Proc. 29th Asilomar Conf. on Signals, Systems and Comp., Pacific Grove, pp. 1337-1341, Oct. 1995.
• MidWest 1995: P. S. Chang and A. N. Willson, Jr., "Adaptive Filtering Using Modified Conjugate Gradient," Proc. 38th Midwest Symp. on Circuits and Systems, Rio de Janeiro, pp. 243-246, Aug. 1995.
• ISCAS 1991: J. Szczupak and P. S. Chang, "Synthesis of Zero Input Limit Cycle Free Networks," Proc. IEEE Int. Symp. on Circuits and Systems, Singapore, pp. 392-395, Jun. 1991.