Time domain compensation for transducer mismatch

Details Time domain compensation for transducer mismatch Time domain compensation for transducer mismatch

1991-04-15

1993-06-29

Ng, Jin F.

Electrical audio signal processing systems and devices

Directive circuits for microphones

381 96, 381 97, 364553, 36472419, H04R 300

Patent

active

052241700

ABSTRACT:
A two channel real time octave analyzer is equipped with an adaptive time domain phase compensation filter whose poles and zeros are programmably selected to counteract phase error associated with any given pair of microphones. Precise matching of microphone phase characteristics is thereby achieved. In the preferred embodiment, the transfer function for the adaptive filter is determined using a pole/zero synthesis technique based on cross spectrum data acquired in an FFT spectral analysis of the probe microphones.

REFERENCES:
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patent: 4741038 (1988-04-01), Elko et al.
patent: 5058170 (1991-10-01), Kanamori et al.
Phan, T. M., "Sound Intensity Probe Calibration-State of the Art," Conference Proceedings, Inter-noise 88, pp. 119-122.
Ren, M. et al., "A Simple Technique for Improving the Performance of Intensity Probes," Noise Control Engineering Journal, vol. 38, No. 1, pp. 17-25.
Nielsen, T. G., "A Field Calibrated Real Time System For Intensity Measurements," Conference Proceedings, Inter-noise 88, vol. 38, No. 1, pp. 17-25.
Technical Review, A Bruel & Kjaer Publication, No. 4-1985, pp. 12-17.
Elliott, et al., "The Adaptive Equalisation of Microphone Responses," Test and Transducer Conference, Wembley, Oct. 28-30, 1986.

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