Synchronized Swept-Sine: Theory, Application, and Implementation - October 2015
Effect of Microphone Number and Positioning on the Average of Frequency Responses in Cinema Calibration - October 2015
The Measurement and Calibration of Sound Reproducing Systems - July 2015
Four-Channel Phonograph Bi-Radial Point Playback Criteria
For accurate and wear free record player for CD-4 (discrete 4-channel) reproduction, true Bi-Radial point dimensions must be accurately maintained, such that the long radium shall be 3x10-3 inches and the short radium shall be 2x10-4 inches. Tracking, tracing, record bearing load and apparent record bearing surface stiffness establish those values critically. Scanning Electron microscope photos show actual radii of points in use. Frequency response curves show the need to maintain these radii to give acceptable performance at the innermost groove.
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