Phase polarity test instrument and method

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

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Details

307358, 328133, 381 12, H04H 500

Patent

active

049088688

ABSTRACT:
The relative phase polarity between two acoustic or electric signals is determined easily, quickly and conclusively with a hand-held instrument providing immediate visual polarity indication. Built-in dual-channel amplification enables a pair of microphones to be utilized as acoustic probes, of particular versatility and benefit in the audio sound field, enabling extremely efficient and virtually fool-proof verification of relative phase polarity between two loudspeakers in practically any sound system or environment during normal operation from almost any source, monophonic, stereophonic, music, speech or even noise, without any dismantling, trial-and-error experimentation, subjective guesswork or other uncertainties usually associated with speaker phasing. An OR-function detector selects the stronger of the two signals under test for comparison with a sum signal derived in an instantaneous summing circuit. In one embodiment, a pair of LED indicators, "IN-PHASE" (green), and "OUT-OF-PHASE" (red), are driven from a dual-comparitor discriminator circuit. A second pair of LEDs may be provided to check signal presence in each channel. In another embodiment, of extended utility as a combined stereo audio/sound field strength dB meter/monitor and phase polarity analyzer/monitor, three multi-element LED displays, of the logarithmic dot/bar graph type, monitor the dynamic levels of the left channel, sum and right channel, arranged in a side-by-side array for visual comparison. Potential uses include testing of speakers, microphones, amplifiers and the like. Among possible options, input potentiometers may be provided in each channel for gain control and balancing, shielded probes may be used for electrical point-to-point in-circuit testing, and the capabilities may be expanded to frequency-selective testing by utilizing a signal generator source.

REFERENCES:
patent: 3067297 (1962-12-01), Fink
patent: 3148287 (1964-09-01), Bauer et al.
patent: 3206550 (1965-09-01), Fink
patent: 3548321 (1970-12-01), Duquesne
patent: 3840817 (1974-10-01), Seki
patent: 4648113 (1987-03-01), Horn et al.
patent: 4691358 (1987-09-01), Bradford

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