Loudspeaker systems
First Claim
1. A loudspeaker system comprising a first and a second main driver connected to common signal input terminals through crossover network means designed so as to pass signals of frequencies lower than a predetermined crossover frequency to said first driver and signals of frequencies higher than said crossover frequency to the second driver, while in a crossover frequency range the signals are passed to both drivers with an amplitude which for increasing frequencies is decreasing for said first driver and increasing for said second driver in such a manner that the transfer function of the loudspeaker system is approximated to a constant function inside and is substantially constant outside said crossover frequency range, characterized in that in addition to said two drivers there is provided at least one auxiliary compensation driver adapted to work in said crossover frequency range and being operable to reproduce an acoustic signal with a frequency-amplitude characteristic which, combined with the corresponding characteristics of the two main drivers, results in the total transfer function of the loudspeaker system being substantially constant inside and outside the crossover frequency range.
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Accused Products
Abstract
A loud speaker system comprising a first and a second main driver connected to common signal input terminals through crossover network means designed so as to pass signals of frequencies lower than a predetermined crossover frequency to said first driver and signals of frequencies higher than said crossover frequency to the said second driver, while in a crossover frequency range the signals are passed to both drivers with an amplitude which for increasing frequencies is decreasing for said first driver and increasing for said second driver in such a manner that the transfer function of the loud speaker system is approximated to a constant function inside and outside said crossover frequency range, and further comprising an auxiliary driver designed to work in said crossover frequency range and fed through filter means so as to have a transfer function which is substantially complementary of the deviation of the combined transfer function of the two main drivers from the constant function outside the crossover frequency range, whereby the auxiliary driver will compensate for the said deviation in an acoustic manner and thus cause the total transfer function of the system to be as constant as desired for a good quality of the sound reproduction. Moreover, even the phase distortion problems in loudspeaker systems are reduced or eliminated in a system according to the invention.
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Citations
13 Claims
- 1. A loudspeaker system comprising a first and a second main driver connected to common signal input terminals through crossover network means designed so as to pass signals of frequencies lower than a predetermined crossover frequency to said first driver and signals of frequencies higher than said crossover frequency to the second driver, while in a crossover frequency range the signals are passed to both drivers with an amplitude which for increasing frequencies is decreasing for said first driver and increasing for said second driver in such a manner that the transfer function of the loudspeaker system is approximated to a constant function inside and is substantially constant outside said crossover frequency range, characterized in that in addition to said two drivers there is provided at least one auxiliary compensation driver adapted to work in said crossover frequency range and being operable to reproduce an acoustic signal with a frequency-amplitude characteristic which, combined with the corresponding characteristics of the two main drivers, results in the total transfer function of the loudspeaker system being substantially constant inside and outside the crossover frequency range.
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6. A loudspeaker system having a plurality of main drivers for reproducing individual frequency ranges, which ranges when combined represent the entire audio frequency spectrum, comprising:
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first and second main drivers covering respective adjacent frequency ranges and connected to common input terminals through passive crossover network means of at least second order designed so as to pass signals of frequencies lower than a predetermined crossover frequency to said first main driver and signals of frequencies higher than said crossover frequency to said second main driver, while in a crossover frequency range the signals are passed to both main drivers with an amplitude which for increasing frequencies is decreasing for said first driver and increasing for said second driver, said first and second main drivers cooperating with said passive crossover network means for individually reproducing an acoustic signal with a frequency-amplitude characteristic which is the same frequency-amplitude characteristic of the respective individual speakers of a conventional multiple driver loudspeaker system covering respectively adjacent frequency ranges and said first and second main drivers being connected substantially in phase with each other; and at least one auxiliary compensation driver adapted to work in said crossover frequency range and being operable to reproduce an acoustic signal with a frequency-amplitude characteristic which when combined with the corresponding characteristics of said first and second main drivers, results in the total transfer function of the loudspeaker system being substantially constant inside and outside the crossover frequency range. - View Dependent Claims (7, 8, 9)
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10. A loudspeaker system comprising:
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first and second main drivers connected substantially in phase to common input terminals through passive crossover network means designed so as to pass signals of frequencies lower than a predetermined crossover frequency to said first driver and signals of frequencies higher than said crossover frequency to said second driver, while in a crossover frequency range the signals are passed to both drivers with an amplitude which for increasing frequencies is decreasing for said first driver and increasing for said second driver, said first and second drivers individually reproducing an acoustic signal with a frequency-amplitude characteristic which is the same frequency-amplitude characteristic of the respective individual speakers of a conventional two-driver loudspeaker system; and at least one auxiliary compensation driver adapted to work in said crossover frequency range and being operable to reproduce an acoustic signal with a frequency-amplitude characteristic which combined with the corresponding characteristics of said first and second main drivers, results in the total transfer function of the loudspeaker system being substantially constant inside and outside the crossover frequency range. - View Dependent Claims (11, 12, 13)
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Specification