Driving apparatus

Details Driving apparatus Driving apparatus

1989-04-19

1990-07-24

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Transmitter systems

381 96, 333217, H04R 300

Patent

active

049439561

ABSTRACT:
A driving apparatus for electrically driving a vibrator constituting an acoustic apparatus, wherein the output impedance of the driving apparatus is negative at least one frequency associated with the output sound pressure of the acoustic apparatus among resonance frequencies when the acoustic apparatus is viewed from a terminal for driving the vibrator, and the ratio of the output impedance to the internal impedance inherent in the vibrator never becomes constant over all the acoustic reproduction range of the acoustic apparatus. Then, it is possible to eliminate mutual dependency between resonance systems having the resonance frequencies, design of the resonance systems become easy, and improved performance of sound radiation can be expected.

REFERENCES:
patent: 4220040 (1980-09-01), Noguchi et al.
"Loudspeakers in Vented Boxes: Part I", A. N. Thiele, Journal of the Audio Engineering Society, May 1971, vol. 19, No. 5, pp. 382-392.
"Loudspeakers in Vented Boxes: Part II", A. N. Thiele, Journal of the Audio Engineering Society, Jun. 1971, vol. 19, No. 6, pp. 471-483.

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