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New Measurement Techniques for Portable Listening Devices: Technical Report - October 2013
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Loudspeaker Phase Characteristics and Time Delay Distortion: Part 1

A technique is described for measurement of the complete frequency response of a loudspeaker, including amplitude and phase. A concept of time delay is introduced which provides a physical description of the effect of phase and amplitude variations as a frequency-dependent spatial smearing of the effective acoustic position of a loudspeaker.

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JAES Volume 17 Issue 1 pp. 30-41; January 1969
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