Abstract
The system referred to in the preceding paper involves measurement of acoustic pressure, both in amplitude and in phase, on two concentric spheres of known radii. Among possible sources of error are: the finite number of measurements; inaccuracy in microphone positioning; scattering by the moving boom system; electrical and acoustical noise in the microphone system; spurious phase shifts and gain inequalities in the microphone and amplifier channels; timing errors and overtone sensitivity of the phase‐sensitive detectors; offsets and quantizing errors in the analog‐to‐digital converter; and numerical computation errors. Effects due to the nonideal nature of the anechoic chamber are in a different category, since our system measures the reflected wave directory. [Work supported by NSF.]
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