Audio phase polarity test system

Electrical audio signal processing systems and devices – Monitoring/measuring of audio devices – Loudspeaker operation

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381 96, H04R 2900

Patent

active

053197143

ABSTRACT:
Instrumentation for determining audio phase polarity is directed particularly to avoiding errors commonly encountered in pulsed acoustic polarity testing due to waveform distortions such as overshoot and ringing typically introduced by loudspeaker cone resonances, etc. The acoustic signal is sensed by a test microphone, amplified and processed to provide a non-inverted and an inverted waveform which are envelope-detected and their leading edges analyzed in real time at three key levels. One of pair of latching comparators triggers at a designated level to determine the phase polarity. The result is held in register while the signal amplitude is checked. If the amplitude is found to be within a suitable working dynamic range then the registered phase polarity is indicated by a timed indication on either a red or a green LED; otherwise indication is inhibited to avoid error. Thus a user sensitivity control is not required. A special test signal generator provides a fast-rising impulse waveform repeating at one second intervals, available at a line level output port for driving amplifier inputs, and at a loudspeaker output port for direct polarity testing of loudspeakers from special battery-power-efficient drive circuitry. Options include provisions for polarity testing of microphones and for using an external test microphone on a boom to reach inaccessible speaker locations.

REFERENCES:
patent: 4908868 (1990-03-01), McTaggart
Tremaine, Howard M.,Audio Cyclopedia, Howard W. Sams, 1979.

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