Operator's, organizational, direct support, general support, and depot maintenance manual including repair parts and special tools list : headset-microphone kit MK-1039/G.

"December 1966."

Bob Ufer at WJR microphone

[crop marks removed from scanned image]

Radio - Microphone

Ty Tyson and Walter Hoffman

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Walter Hoffman and new microphone

Radio - Microphone

Walter Hoffman and new microphone

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Walter Hoffman and new microphone

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Microphone and loudspeaker arrays for room acoustic measurements

A multichannel spherical speaker array allows, together with a spherical microphones array, the measurement of the MIMO (Multiple Input Multiple Output) acoustic impulse response of an environment capturing meaningful information about propagation of sound between source an receiver. The mathematical framework for extracting arbitrary directivity virtual microphones from real microphones array signals is recalled and the application of the same method to the speakers array to generate arbitrary directivity source is presented. A convenient solutions for the construction and calibration of speakers spherical array for measurement purposes is illustrated. The postprocessing technique developed to compute and visualize acoustic path between source and receiver from measured MIMO impulse response is discussed. Real word results from measurement in a small theater are shown.