{"title":"An Improved Quality Adaptive Rate Filtering Technique Based on the Level Crossing Sampling","authors":"Saeed Mian Qaisar, Laurent Fesquet, Marc Renaudin","volume":17,"journal":"International Journal of Electronics and Communication Engineering","pagesStart":732,"pagesEnd":738,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/14089","abstract":"Mostly the systems are dealing with time varying\nsignals. The Power efficiency can be achieved by adapting the system\nactivity according to the input signal variations. In this context\nan adaptive rate filtering technique, based on the level crossing sampling\nis devised. It adapts the sampling frequency and the filter order\nby following the input signal local variations. Thus, it correlates the\nprocessing activity with the signal variations. Interpolation is required\nin the proposed technique. A drastic reduction in the interpolation\nerror is achieved by employing the symmetry during the interpolation\nprocess. Processing error of the proposed technique is\ncalculated. The computational complexity of the proposed filtering\ntechnique is deduced and compared to the classical one. Results\npromise a significant gain of the computational efficiency and hence\nof the power consumption.","references":"[1] J.W. Mark and T.D. Todd, \"A nonuniform sampling ap-proach to data\ncompression\", IEEE Transactions on Communica-tions, vol. COM-29,\npp. 24-32, January 1981.\n[2] E. Allier, G. Sicard, L. Fesquet and M. Renaudin, \"A new class of\nasyn-chronous A\/D converters based on time quantization\",\nASYNC'03, pp.197-205, May 2003.\n[3] F. Aeschlimann, E. Allier, L. Fesquet and M. Renaudin, \"Asynchronus\nFIR filters, towards a new digital processing chain\", ASYNC'04, pp.\n198-206, April 2004.\n[4] N. Sayiner, H.V. Sorensen and T.R. Viswanathan, \"A Level-Crossing\nSampling Scheme for A\/D Conversion\", IEEE Transactions on Circuits\nand Systems II, vol. 43, pp. 335-339, April 1996.\n[5] S.C. Sekhar and T.V. Sreenivas, \"Adaptive window zero-crossing\nbased instantaneous frequency estimation\", EURASIP Journal on Applied\nSignal Processing, pp.1791-1806, Volume 2004, Issue 1, January\n2004.\n[6] D.M. Klamer and E.Marsy, \"Polynomial interpolation of randomly\nsam-pled band-limited functions and processes\", SIAM Review,\nvol.42, No.5, pp. 1004-1019, October 1982.\n[7] F.J. Beutler, \"Error free recovery from irregularly spaced samples\",\nSIAM Review, vol. 8, pp. 328-335, 1996.\n[8] S.M. Qaisar, L. Fesquet and M. Renaudin \"Spectral Analysis of a signal\nDriven Sampling Scheme\", EUSIPCO-06, September 2006.\n[9] S. de Waele and P.M.T.Broersen, \"Time domain error measures for resampled\nirregular data\", IEEE Transactions on Instrumentation and\nMeas-urements, pp.751-756, May 1999.\n[10] S. de Waele and P.M.T. Broersen, \"Error measures for resampled irregu-\nlar data\", IEEE Transactions on Instrumentation and Measurements,\npp.216-222, April 2000.\n[11] S.M. Qaisar, L. Fesquet and M. Renaudin, \"Computationally efficient\nadaptive rate sampling and filtering\", EUSIPCO-07, pp.2139-2143,\nSeptem-ber 2007.\n[12] M. Gretains, \"Time-frequency representation based chirp like signal\nanalysis using multiple level crossings\", EUSIPCO-07, pp.2154-2158,\nSep-tember 2007.\n[13] S.M. Qaisar, L. Fesquet and M. Renaudin, \"Adaptive rate filtering for a\nsignal driven sampling scheme\", ICASSP-07, pp.1465-1468, April\n2007.\n[14] F. Marvasti, \"Nonuniform sampling theory and practice\", Kluwer academic\/\nPlenum Publisher, New York, 2001.\n[15] Martin Vetterli, \"A theory of multirate filter banks\", IEEE transaction\non Acoustic, Speeh and Signal Processing, vol. 35, pp.356-372, March\n1987.\n[16] S. Chu and C.S. Burrus, \"Multirate filter designs using comb filters\",\nIEEE transaction on Circuits and Systems, vol. 31, PP. 913-924, November\n1984.\n[17] K. M. Guan et al. \"Oppertunistic Sampling by Level-Crossing\",\nICASSP-07, pp.1513-1516, April 2007.\n[18] F. Akopyan et al. \"A level-crossing flash analog-to-digital converter\",\nASYNC-06, pp.12-22, March 2006.\n[19] S.M. Qaisar, L. Fesquet and M. Renaudin, \"An Adaptive resolution\ncomputationally efficient short time Fourier transform\", EURASIP,\nRLSP, April 2008.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 17, 2008"}