Protection against jamming in a servo system of optical recorders

Engineering Information Abstracts (Part I) MA, USA. Sponsored by: IEEE Piscataway NJ USA. p 177-182 CODEN: 002845 Publication Year: 1997 Abstract: This paper presents the results of work Planning Systems Inc. performed in fulfillment of the requirements of a Small Business Innovative Research ŽSBIR. Phase I feasibility study for the Federal Highway Administration ŽFHWA.. The feasibility of developing an acoustic sensing technique to replace the current electromechanical Žloop detector, tape switch, pneumatic tube. based methods of collecting vehicle axle passages was investigated. We exploit the fact that the dominate source of road noise is the broadband acoustic energy radiated by vehicle tires by cross-correlating the outputs of spatially separated roadside microphones. The results demonstrate the feasibility of detecting vehicle passages by the cross correlation processing of radiated tire noise. The technique is based on technology developed as a consequence of our work in underwater acoustic signal processing. In English ŽAuthor abstract . 6 Refs. EI Order Number: 98044175256 Keywords: Intelligent vehicle highway systems; Motor transportation; Acoustic noise; Tires; Sensors; Microphones; Correlation theory; Acoustic signal processing; Highway traffic control Title: AUTOMATIC TRAFFIC MONITORING BY INTELLIGENT SOUND DETECTION Author(s): Chen, S.; Sun, Z.P.; Bridge, B. Source: Proceedings of the 1997 IEEE Conference on Intelligent Transportation Systems, ITSC Nov 9-12 1997 Boston, MA, USA. Sponsored by: IEEE Piscataway NJ USA. p 171-176 CODEN: 002845 Publication Year: 1997 Abstract: A novel traffic sensing technique is described which utilizes a microphone array to detect the sound waves generated by the road vehicles. The detected are then digitized and processed by an on-site computer using a correlation based algorithm, which extracts key data reflecting the road traffic conditions, e.g. the speed and density of vehicles on the road, automatically on-site. In comparison with existing traffic sensors, the proposed system offers lower installation and maintenance costs and is less intrusive to the surrounding built environment. The results of theoretical analysis, computer simulation and some preliminary experiments are presented. In English ŽAuthor abstract . 4 Refs. EI Order Number: 98044175255 Keywords: Highway traffic control; Microphones; Acoustic waves; Digital signal processing; Acoustic signal processing; Feature extraction; Computer simulation; Correlation theory; Algorithms; Sensors Title: PROTECTION AGAINST JAMMING IN A SERVO SYSTEM OF OPTICAL RECORDERS Author(s): Ryabokon, Igor P.; Ataev, Viktor A.; Morozovsky, Oleg Y. Source: Proceedings of SPIE - The International Society for Optical Engineering Int. Conference on Optical Storage,

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Imaging, and Transmission of Information May 14 1996 v 3055 Kiev, Ukraine Sponsored by: SPIE - Int Soc for Opt Engineering, Bellingham, WA USA. Society of Photo-Optical Instrumentation Engineers Bellingham WA USA. p 259-263 ISSN: 0277-786X CODEN: PSISDG ISBN: 0-8194-2470-6 Publication Year: 1997 Abstract: Anti-jamming processing of optoelectronic detector signals, ensures control system invariance to change of laser power, dispersion of reflection from layer and presence of information pits. Logarithm amplification of photodetector currents stabilizes steepness of their characteristics at change of laser power Žmore than 10 times. and factor of reflection from surface Ž3 times.. Besides, sections of tracing signal are chosen, which are located in intervals between information pits and free from recording. This measures increased focusing and tracking accuracy 2 - 3 times. In English 3 Refs. EI Order Number: 97093812623 Keywords: Optical recording; Optical data storage; Optoelectronic devices; Control systems; Servomechanisms; Photodetectors Title: HOW DO WE MAKE A GOOD INPUT IMAGE? Author(s): Monroe, Stanley E. Jr.; Juday, Richard D. Source: Proceedings of SPIE - The International Society for Optical Engineering Optical Pattern Recognition VIII Apr 22-23 1997 v 3073 Orlando, FL, USA Sponsored by: SPIE - Int Soc for Opt Engineering, Bellingham, WA USA. Society of Photo-Optical Instrumentation Engineers Bellingham WA USA. p 232-242 ISSN: 0277-786X CODEN: PSISDG ISBN: 0-8194-2488-9 Publication Year: 1997 Abstract: We investigate some methods of transforming an electronic video image prior to inserting it into an optical correlator. In order that the results might be implemented as a video transfer function, we do only point operations. We consider the input characteristics of the input SLM and laos the statistics of the input image. We model the correlator as noiseless, and we evaluate the transformations by tow metrics: correlation intensity and peak-to- correlation-energy. In English EI Order Number: 97093812924 Keywords: Video signal processing; Image processing; Optical correlation; Correlation detectors; Transfer functions; Light modulators; Statistical methods Title: COMBINED OPTICAL AND NEURAL NETWORK FINGERPRINT MATCHING Author(s): Wilson, Charles L.; Watson, C.I.; Paek, Eung Gi Source: Proceedings of SPIE - The International Society for Optical Engineering Optical Pattern Recognition VIII Apr 22-23 1997 v 3073 Orlando, FL, USA Sponsored by: SPIE - Int Soc for Opt Engineering, Bellingham, WA USA. Society of Photo-Optical Instrumentation Engineers Bellingham WA USA. p 373-382 ISSN: 0277-786X CODEN: PSISDG ISBN: 0-8194-2488-9 Publication Year: 1997 Abstract: This paper presents results on direct optical matching of inked and real-time fingerprint images. Direct optical