Significantly Enhanced Audio Experience via Signal Processing for Extreme Noise Environments

John Connell Auditorium Engineers Australia Building, 21 Bedford Street, North Melbourne, Melbourne

by Dr Raymond Chen, Senior Technical Director, Broadcom Corp ABSTRACT When an audio signal is severely degraded due to acoustic ambient noise, wind noise, channel noise, or interference/congestion in the wired or wireless networks, selected signal processing techniques can dramatically enhance the audio signal to change it from unacceptable to something reasonably good. This talk will present a technology overview of many signal processing algorithms developed at Broadcom in the last 15 years that achieve this goal when addressing a wide variety of audio degradation problems due to noise. The algorithms covered in this talk include single-channel and multi-channel noise suppression and wind noise reduction, FM enhancement, speech intelligibility enhancement, packet loss concealment, and bit error concealment. Numerous audio clips will be played throughout the presentation to demonstrate the dramatic effects, and often night-and-day differences, that these signal processing algorithms can achieve when the noise condition is extreme. SPEAKER Juin-Hwey (Raymond) Chen received his B.S.E.E. degree from National Taiwan University in 1980 and his Master and Ph.D. degrees in Electrical Engineering from University of California, Santa Barbara in 1983 and 1987, respectively. He joined Broadcom Corporation in 2000 and is now a Senior Technical Director there. Prior to joining Broadcom, Raymond spent 8 1/2 years at AT&T Bell Labs and AT&T Labs, three years at Voxware, Inc., and one year at Lucent Technologies. His research focus is on compression and quality enhancement of speech and audio signals. He has more than 50 technical publications and is an inventor of 80 issued United States patents and 24 pending U.S. patent applications. He is the primary inventor of the ITU-T G.728 speech coding standard and the BV16 and BV32 speech codecs in the PacketCable, SCTE, ANSI, and ITU-T J.161 and J.361 standards. He is also known for inventing a postfiltering speech enhancement technique that is used in most international speech coding standards established since 1987. Throughout his career, he has invented numerous speech codecs, many of which are widely used commercially. Raymond was elected a Fellow of the IEEE in 1995 and a Broadcom Fellow in 2006.