Perceptual Effects of Dynamic Range Compression in Popular Music Recordings - January 2014
New Measurement Techniques for Portable Listening Devices: Technical Report - October 2013
Automatic Assembly Line Testing of Cartridges
Several measurements are required to verify that the performance of every pickup cartridge assembled on a production line meets its published specifications. Automatic testing makes faster and more accurate measurements possible, and with stored program control, statistical distributions of performance parameters in a production series can be computed. In addition, hard copy of test results, to be enclosed with the cartridge, can be obtained. A minicomputer based production test system for stereo - and quadrophonic cartridges its described, where, by employing a specially designed test record as signal source, the following parameters, characterizing a cartridge are measured and compared against specifications, output voltage, channel difference, tracking ability, frequency response, and channel separation. With a reference cartridge calibrated by the two speed method, variations in test record frequency response are measured automatically, and accounted for in test results. The system incorporates a strip printer for printout of calibration data, and a level recorder to plot frequency response. The total time, including handling, is less than one minute, for the complete test of a cartridge.
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