Electrical audio signal processing systems and devices – Monitoring/measuring of audio devices – Loudspeaker operation
Patent
1991-07-18
1993-02-09
Isen, Forester W.
Electrical audio signal processing systems and devices
Monitoring/measuring of audio devices
Loudspeaker operation
381 97, H04R 2900
Patent
active
051858010
ABSTRACT:
A circuit for improving the transient behavior of a two-way loudspeaker system includes a crossover circuit with high selectivity, amplitude and phase correction circuitry for separately correcting the amplitude and phase responses of the high and low frequency drivers in their mounting environment, and correction circuitry for correcting the composite amplitude and phase response of the overall loudspeaker system after insertion of the crossover. A further phase offset technique and circuit provides for introducing frequency dependent phase shift in the loudspeaker system's high or low frequency channels for offsetting the phase responses of the high and low frequency drivers within the crossover frequency range. According to the phase offset technique of the invention, phase shift is added, preferably in the high frequency channel, until composite amplitude response curves observed on-axis and at different vertical angles off-axis are forced to be consistent. After consistency is achieved the deterioration of the amplitude response resulting from the phase offset is corrected to a flat response by means of a forced series amplitude correction circuit inserted before the crossover. The result is improved transient response off-axis as well as on-axis.
REFERENCES:
patent: 4015089 (1977-03-01), Ishii et al.
patent: 4769848 (1988-09-01), Eberbach
Suzuki, On the Perception of Phase Distortion, Journal of the Audio Engineering Society, 1980 Sep., vol. 28, #9.
Leach, Jr., Loudspeaker Driver Phase Response: The Neglected Factor in Crossover Network Design, Journal of the Audio Engineering Society (Mar. 1980).
Fink, Time Offset and Crossover Design, Journal of the Audio Engineering Society, 1980 Sep. vol 28, #9.
Linkwitz, Active Crossover Networks for Noncoincident Drivers, Journal of the Audio Engineering Society, vol. 24, No. 1, Jan.-Feb. 1976.
Vanderkooy, Power Response to Loudspeaker with Noncoincident Drivers--The Influence of Crossover Design, Journal of the Audio Engineering Society, vol. 34, #4, Apr. 1986.
Kohut Paul
Meyer John D.
Beeson Donald L.
Isen Forester W.
Meyer Sound Laboratories Incorporated
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