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US 4,074,070 AGranted
Supersonic signal linearizes loudspeaker operation
AssigneeBraun GmbH
InventorHarry Gaus
Life of this patent
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Abstract
A loudspeaker driver system linearizes loudspeaker operation by superimposing a high frequency (supersonic) signal on the low frequency (audio) signal. Features include a special crossover network for a multispeaker system, and an acoustic filter formed of perforated discs.
Claims11
A process for minimizing audio distortions in electrodynamic loudspeaker apparatus having first, second, and third loudspeaker systems each having a driving system including a diaphragm connected to a coil moving in response to electrical signals, which comprises:
- superimposing a high frequency oscillation signal on a low frequency audio signal coupled to said movable coils;
- vibrating said diaphragms in response to said high frequency oscillation signal and said low frequency audio signal;
- and
- providing minimum damping of said high frequency signal coupled to said driving system of said first and second loudspeaker systems, and an increase in damping for signals at frequencies above an auditory frequency range coupled to said driving system of said third loudspeaker system.
1 more element
Loudspeaker apparatus comprising:
- first, second, and third electrodynamic loudspeaker systems each having a driving system means including a diaphragm connected to a coil moving in response to electrical signals;
- means for superimposing a high frequency oscillation signal on a low frequency audio signal coupled to said coils of said driving systems to vibrate said diaphragms in response to said high frequency oscillation signal and said low frequency audio signal;
- and
- frequency cross-over network means for said first, second, and third loudspeaker systems, said cross-over network means providing a minimum damping of said high frequency oscillation signal coupled to said driving system means of said first and second loudspeaker systems, and an increase in damping for signals at frequencies above an auditory frequency range coupled to said driving system means of said third loudspeaker system.
1 more element
Dependencies are inferred from the claim text.