Henrique Malvar is a Microsoft Distinguished Engineer and the Managing Director of Microsoft Research in Redmond, WA.

Previously, Rico was a founding member of the Signal Processing research group at Microsoft Research, which evolved into the Communication and Collaboration Systems group and the Knowledge Tools group. His technical contributions at Microsoft include co-development of the Windows Media Audio digital audio format, image compression technologies for Microsoft Office, Tablet PC, Xbox 360 and Flight Simulator X, digital elevation map compression technologies for Flight Simulator X, rights management technologies for Windows Media, new video transform and quantization techniques that were adopted into H.264 (MPEG-4 AVC), ink compression formats for Microsoft Office and Tablet PC, acoustic signal processing technologies for Windows Messenger, Microsoft Office RoundTable, and Windows Vista, and co-development of the HD Photo format for digital pictures, which is the basis for the upcoming JPEG XR standard. His technical interests include audio and video signal enhancement and compression, multirate signal processing, signal decompositions (filter banks, transforms, wavelets), fast algorithms, coding theory, and electronics hardware.

Rico received a Ph.D. in Electrical Engineering and Computer Science from the Research Laboratory of Electronics at MIT in 1986. Before coming to Microsoft, Rico was Vice President of Research and Advanced Technology at PictureTel (later acquired by Polycom). Prior to that, he headed the Digital Signal Processing Research Group at Universidade de Brasília, Brazil. He received the Marconi Young Scientist Award in 1981, was elected a Fellow of the IEEE in 1997, and received the Technical Achievement Award from the IEEE Signal Processing Society in 2002. He is a member of the editorial board of the journal Applied and Computational Harmonic Analysis (ACHA) and was until recently an associate editor of the journal IEEE Transactions on Signal Processing. He holds over 75 issued patents and has published over 150 technical articles in journals, conferences, technical reports, and standards contributions. Rico is a "carioca", which means he was born in Rio de Janeiro, Brazil.

Selected Publications*

• D. A. Bendersky, J. W. Stokes, and H. S. Malvar, Nonlinear residual acoustic echo suppression for high levels of harmonic distortion, IEEE International Conference on Acoustics, Speech, and Signal Processing, Las Vegas, NV, April 2008.
• H. S. Malvar, Lossless and near-lossless audio compression using integer-reversible modulated lapped transforms, IEEE Data Compression Conference, Snowbird, UT, pp. 323–332, March 2007.
• H. S. Malvar, Lossless adaptive encoding and decoding of integer data, U.S. Patent No. 7,015,837, March 2006.
• C. J. C. Burges, D. Plastina, J. Platt, E. Renshaw, and H. S. Malvar, Using audio fingerprinting for duplicate detection and thumbnail generation, IEEE International Conference on Acoustics, Speech, and Signal Processing, Philadelphia, PA, March 2005.
• I. Tashev and H. S. Malvar, A new beamformer design algorithm for microphone arrays, IEEE International Conference on Acoustics, Speech, and Signal Processing, Philadelphia, PA, March 2005.
• H. S. Malvar, Fast algorithm for the modulated complex lapped transform, Microsoft Research Technical Report TR-2005-2, Jan. 2005.
• D. Kirovski, H. S. Malvar, and Y. Yacobi, A dual watermark-fingerprint system, IEEE Multimedia, pp. 59–73, July-Sept. 2004.
• H. S. Malvar, L.-W. He, and R. Cutler, High-quality linear interpolation for demosaicing of Bayer-patterned color images, IEEE International Conference on Acoustics, Speech, and Signal Processing, Montreal, Canada, May 2004.
• H. S. Malvar and G. J. Sullivan, YCoCg-R: A Color Space with RGB Reversibility and Low Dynamic Range, Joint Video Team (JVT) of ISO/IEC MPEG & ITU-T VCEG, Document No. JVT-I014r3, July 2003.
• H. Malvar, A. Hallapuro, M. Karczewicz, and L. Kerofsky, Low-complexity transform and quantization in H.264/AVC, IEEE Transactions on Circuits and Systems for Video Technology, vol. 13, pp. 598–603, July 2003.
• H. S. Malvar and D. A. F. Florêncio, Improved spread spectrum: a new modulation technique for robust watermarking, IEEE Transactions on Signal Processing, vol. 51, pp. 898–905, Apr. 2003.
• D. Kirovski and H. S. Malvar, Spread-spectrum watermarking of audio signals, IEEE Transactions on Signal Processing, vol. 51, pp. 1020–1033, Apr. 2003.
• H. S. Malvar, Lossless adaptive encoding of finite alphabet data, U.S. Patent No. 6,477,280, Nov. 2002.
• B. W. Gillespie, D. A. F. Florêncio, and H. S. Malvar, Speech dereverberation via maximum-kurtosis subband adaptive filtering, IEEE International Conference on Acoustics, Speech, and Signal Processing, Salt Lake City, UT, pp. 3701–3704, May 2001.
• J. W. C. Rosa, F. A. C. M. Cardoso, K. Aki, H. S. Malvar, F. A. V. Artola, and J. W. C. Rosa, Modelling elastic media with the wavelet transform, Geophysics Journal International, vol. 146, pp. 454–488, 2001.
• H. S. Malvar, Scalable audio coder and decoder, U.S. Patent No. 6,029,126, Feb. 2000.
• H. S. Malvar, Fast progressive image coding without wavelets, IEEE Data Compression Conference, Snowbird, UT, pp. 243–252, March 2000.
• H. S. Malvar, Fast progressive wavelet coding, IEEE Data Compression Conference, Snowbird, UT, pp. 336–343, March 1999.
• H. S. Malvar, A modulated complex lapped transform and its applications to audio processing, IEEE International Conference on Acoustics, Speech, and Signal Processing, Phoenix, AZ, pp. 1421–1424, March 1999.
• B. Guenter, C. Grimm, D. Wood, H. S. Malvar, and F. Pighin, Making faces, Proc. SIGGRAPH, Orlando, FL, pp. 55–66, July 1998.
• H. S. Malvar, Fast Algorithms for Orthogonal and Biorthogonal Modulated Lapped Transforms, IEEE Symposium Advances Digital Filtering and Signal Processing, Victoria, Canada, pp. 159–163, June 1998.
• H. S. Malvar, Biorthogonal and nonuniform lapped transforms for transform coding with reduced blocking and ringing artifacts, IEEE Trans. Signal Processing, pp. 1043–1053, Apr. 1998.
• H. S. Malvar, Signal Processing with Lapped Transforms. Boston, MA: Artech House, 1992.
• H. S. Malvar, Lapped transforms for efficient transform/subband coding, IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. 38, pp. 969–978, June 1990.
• H. S. Malvar, Modulated QMF filter banks with perfect reconstruction, Electronics Letters, vol. 26, no. 13, pp. 906–907, June 1990.
• H. S. Malvar and D. H. Staelin, The LOT: transform coding without blocking effects, IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. 37, pp. 553–559, Apr. 1989.
• H. S. Malvar and D. H. Staelin, Optimal FIR pre- and post- filters for decimation and interpolation of random signals, IEEE Transactions on Communications, vol. 36, pp. 67–74, Jan. 1988.
• H. S. Malvar, Electronically-controlled active-C filters and equalizers with operational transconductance amplifiers, IEEE Transactions on Circuits and Systems, vol. CAS-31, no. 7, pp. 645–649, July 1984.
• H. S. Malvar and L. P. Calôba, Least-squares lowpass filters with nonmonotonic response, IEEE Transactions on Circuits and Systems, vol. CAS-27, no. 12, pp. 1270–1272, Dec. 1980.

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Software & Book Errata

- Here are programs for fast Fourier, cosine, and lapped transforms.
- Here is an up-to-date list of corrections from my book "Signal Processing with Lapped Transforms".