H - Electricity – 04 – R
Patent
H - Electricity
04
R
179/39
H04R 1/22 (2006.01) H04R 3/04 (2006.01) H04R 3/14 (2006.01)
Patent
CA 1223526
ELECTROACOUSTIC NETWORK ABSTRACT OF THE DISCLOSURE Disclosed is a passive delay network for insertion in the high frequency signal path of a crossover network in a high fidelity loudspeaker. The delay network provides a device to adjust the optimum listening window electrically rather than by changes in the physical construction of the speaker cabinet. Electroacoustic high frequency and low frequency drivers may be mounted in a planar baffle or mounted co-axially. The delay network retains a "flat" amplitude-frequency charac- teristic and minimizes time dispersion in the acoustic signal received by the listener. Correction for time delay is most important near the transition frequency of the crossover network because near the transition frequency substantially equal sound energy is radiated by both the high frequency and low frequency drivers. Also disclosed is a novel construction for a co-axial driver combination and a technique for adjusting both the delay in the electric delay line network and the air path delay of electroacoustic drivers. The co-axial drivers include sound absorbent material between the drivers to prevent direct sound radiation between the low and high frequency drivers. The adjustment technique comprises a method of experimentally testing and adjusting the mutual inductances in the electric delay line and the air path delay.
476715
Eberbach Steven J.
Gowling Lafleur Henderson Llp
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