Contains reports on one research project.Clarence J. LeBel Fun

Cuddy, David R.

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Prof. A. G. BoseProf. J. D. BruceL. G. BahlerJ. R. BoddieD. R. CuddyXI. SIGNAL PROCESSINGAcademic and Research StaffProf. C. L. SearleProf. H. J. ZimmermannGraduate StudentsM. F. DavisJ. T. DohertyDr. M. V. CerrilloZ. BaratJ. M. KatesD. B. PaulD. G. RichardsonA. SPECTRUM SCANNERClarence J. LeBel FundD. R. CuddyA device to display an audio spectrum has been designed and constructed. The scan-ner is used in conjunction with a General Radio multifilter which contains 30 adjacentthird-octave bandpass filters. The filter outputs are fed to a bank of 30 signal aver-agers, which produce dc levels proportional to the rms value of the narrow-band audiosignals. These dc levels are then sampled sequentially by COS/MOS switch multi-plexers. The sampled spectrum is processed by a logarithmic amplifier, and log ampli-tude vs frequency is displayed on an oscilloscope. The display covers the frequencyrange 20-20 kHz with a dynamic range of more than 45 dB.QPR No. 109 189

Signal Processing

http://dspace.mit.edu/bitstream/1721.1/56387/1/RLE_QPR_109_XI.pdf

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