Electrical audio signal processing systems and devices – Including frequency control
Patent
1980-05-05
1983-12-20
Stellar, George G.
Electrical audio signal processing systems and devices
Including frequency control
1791751A, H04R 122, H04R 304, H04R 314, H04R 2900
Patent
active
044219490
ABSTRACT:
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 means to adjust the optimum listening window electrically rather than by changes in the physical construction of the speaker cabinet. Electro-acoustic 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 characteristic 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 means preventing 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.
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Reprint From Wireless World, May & Jun. 1978, "Loudspeaker System Design", S. Linkwitz, (3 Parts), (Date of 3rd Part Unknown-Possibly Oct.).
Deimen James M.
Stellar George G.
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