US4315102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speaker cross-over networks
Assignee: Individual
•
Filing: 1979-03-21
•
Granted: 1982-02-09
•
Expires: 1999-03-21
Abstract
Abstract The invention comprises improved electroacoustic audio speaker cross-over networks. The improvements comprise both the addition of various passive elements and a novel inductively coupled circuit configuration. The improvements are applied to low pass and high pass networks and combinations thereof. In the preferred embodiments a separate electrical circuit is inductively coupled to the filter network. The physical configuration of the separate circuit can be easily adjusted to counter variations in individual speaker performance parameters. Thus, production variations in speakers from the same manufacturer or among the products of different manufacturers can be overcome and a better matching of speakers provided. In the simplest embodiment the separate inductively coupled circuit comprises a copper ring placed within an inductive coil of the filter. Adjustment is accomplished by adjusting the physical location within the coil or by small changes in the physical dimensions of the ring.
Inventors
- 👤 Steven J. Eberbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:19
CPC Classifications
H; H04; H04R; H04R3/00; H04R3/12; H04R3/14
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
100 words
In an electric loudspeaker circuit comprising at least one electroacoustic driver, an acoustic frequency filter connected to said driver, said filter including a first inductance and a resistance in series with each other and in series with said driver and a capacitance in parallel with said driver, the improvement characterized by, a second circuit comprising at least one inductance, said inductance in the second circuit positioned for magnetic coupling to the first inductance, said first inductance and second circuit being selected and adjusted for substantially linear phase response of the driver and filter combination within and beyond the pass band.
Claim 2
Dependent Claim
100 words
In an electric loudspeaker circuit comprising at least one electroacoustic driver, an acoustic frequency filter connected to said driver, said filter including a first inductance and a resistance in series with each other and in series with said driver and a capacitance in parallel with said driver, the improvement characterized by, a second circuit comprising at least one inductance, said inductance in the second circuit positioned for magnetic coupling to the first inductance, said first inductance and second circuit being selected and adjusted for substantially linear phase response of the driver and filter combination within and beyond the pass band.
Claim 3
Dependent Claim
15 words
The electric circuit of claim 1 wherein the second circuit inductance comprises a shorted coil.
Claim 4
Dependent Claim
20 words
The electric circuit of claim 1 wherein the second circuit inductance comprises a metal ring surrounded by the first inductance.
Claim 5
Dependent Claim
24 words
The electric circuit of claim 3 wherein the metal ring is physically positioned within the first inductance to provide the substantially linear phase response.
Claim 6
Dependent Claim
19 words
The electric circuit of claim 3 wherein the depth of the metal ring within the first inductance is adjustable.
Claim 7
Dependent Claim
14 words
The electric circuit of claim 1 wherein the second circuit includes a shorting switch.
Claim 8
Dependent Claim
37 words
The electric circuit of claim 1 including a second capacitance in series with a second driver and a pair of series resonant circuits each in parallel with the second driver and comprising an inductance and a capacitance.
Claim 9
Dependent Claim
25 words
The electric circuit of claim 7 wherein at least one second circuit is magnetically coupled to at least one of the series resonant circuit inductances.
Claim 10
Dependent Claim
14 words
The electric circuit of claim 8 wherein each second circuit comprises a metal ring.
Claim 11
Dependent Claim
155 words
In a crossover network comprising a high pass acoustic frequency filter and at least one high frequency electroacoustic driver, said high pass filter including a capacitance and a resistance in series with each other and in series with said high frequency driver and at least one inductance in parallel with said high frequency driver, and a low pass acoustic frequency filter and at least one low frequency electroacoustic driver, said low pass filter including an inductance and a resistance in series with each other and in series with said low frequency driver and a capacitance in parallel with said low frequency driver, the improvement characterized by, at least one second circuit comprising at least one electric component, said second circuit being inductively coupled to one of said inductances, and, said coupled inductance and second circuit electric component being selected and adjusted for substantially flat amplitude response through the crossover frequency between the filter pass bands.
Claim 12
Dependent Claim
155 words
In a crossover network comprising a high pass acoustic frequency filter and at least one high frequency electroacoustic driver, said high pass filter including a capacitance and a resistance in series with each other and in series with said high frequency driver and at least one inductance in parallel with said high frequency driver, and a low pass acoustic frequency filter and at least one low frequency electroacoustic driver, said low pass filter including an inductance and a resistance in series with each other and in series with said low frequency driver and a capacitance in parallel with said low frequency driver, the improvement characterized by, at least one second circuit comprising at least one electric component, said second circuit being inductively coupled to one of said inductances, and, said coupled inductance and second circuit electric component being selected and adjusted for substantially flat amplitude response through the crossover frequency between the filter pass bands.
Claim 13
Dependent Claim
18 words
The cross-over network of claim 10 including a plurality of second circuits each inductively coupled to individual inductances.
Claim 14
Dependent Claim
24 words
The crossover network of claim 10 wherein the second circuit comprises a shorted coil inductively coupled to said inductance in the low pass filter.
Claim 15
Dependent Claim
14 words
The cross-over network of claim 12 wherein the shorted coil comprises a copper ring.
Claim 16
Dependent Claim
19 words
The cross-over network of claims 12 or 13 wherein the high pass filter includes a plurality of resonant circuits.
Claim 17
Dependent Claim
38 words
The cross-over network of claim 10 wherein the high pass filter includes a plurality of resonant circuits, an inductance in at least one resonant circuit, and at least one second circuit inductively coupled to the resonant circuit inductance.
Claim 18
Dependent Claim
13 words
The cross-over network of claim 15 wherein the second circuits comprise shorted coils.
Claim 19
Dependent Claim
13 words
The cross-over network of claim 16 wherein the shorted coils comprise copper rings.
Claim 20
Dependent Claim
28 words
The cross-over network of claim 15 wherein the low pass filter includes at least one inductance and a second circuit inductively coupled to said low pass filter inductance.
Claim 21
Dependent Claim
31 words
The cross-over network of claim 10 wherein the high pass filter and the low pass filter each separately produce an approximately -6 db attenuation in acoustic output at the cross-over frequency.
Claim 22
Dependent Claim
109 words
In an electric loudspeaker circuit comprising at least one electroacoustic driver, an acoustic frequency filter connected to said driver, said filter including a resistance and a capacitance in series with the driver and in series with each other, the improvement characterized by, a plurality of separate series resonant circuits in parallel with the electroacoustic driver and in parallel with each other, said series resonant circuits located between at least a portion of said filter and said driver, and, said separate series resonant circuits being selected and adjusted to produce a smooth rolloff of amplitude response and a flat phase response within and beyond the pass band of the filter.
Claim 23
Dependent Claim
109 words
In an electric loudspeaker circuit comprising at least one electroacoustic driver, an acoustic frequency filter connected to said driver, said filter including a resistance and a capacitance in series with the driver and in series with each other, the improvement characterized by, a plurality of separate series resonant circuits in parallel with the electroacoustic driver and in parallel with each other, said series resonant circuits located between at least a portion of said filter and said driver, and, said separate series resonant circuits being selected and adjusted to produce a smooth rolloff of amplitude response and a flat phase response within and beyond the pass band of the filter.
Claim 24
Dependent Claim
28 words
The electric circuit of claim 20 wherein the resistance of at least one of the resonant circuits is substantially limited to that inherent in the capacitance and inductance.
Claim 25
Dependent Claim
34 words
The electric circuit of claim 20 wherein the inductance of a first series resonant circuit is substantially 0.7ths of the inductance of a second series resonant circuit in parallel with the first resonant circuit.
Claim 26
Dependent Claim
34 words
The electric circuit of claim 20 wherein the capacitance of a first series resonant circuit is substantially 0.7 of the capacitance of a second series resonant circuit in parallel with the first resonant circuit.
Claim 27
Dependent Claim
29 words
The electric circuit of claim 20 including at least one second circuit, said second circuit including an inductance and being inductively coupled to one of said series resonant circuits.
Claim 28
Independent Claim
77 words
The method of optimizing the performance of an electric loudspeaker circuit including an acoustic frequency filter comprising the steps of, applying a step or impulse signal to the input of the loudspeaker, analyzing the amplitude and phase spectrum of the acoustic output of the loudspeaker, and, adjusting the magnetic coupling between an inductance and second circuit in a filter in the loudspeaker to provide a linear phase response within and outside the pass band of the filter.
Claim 29
Independent Claim
77 words
The method of optimizing the performance of an electric loudspeaker circuit including an acoustic frequency filter comprising the steps of, applying a step or impulse signal to the input of the loudspeaker, analyzing the amplitude and phase spectrum of the acoustic output of the loudspeaker, and, adjusting the magnetic coupling between an inductance and second circuit in a filter in the loudspeaker to provide a linear phase response within and outside the pass band of the filter.
Claim 30
Independent Claim
120 words
The method of optimizing the performance of an electric loudspeaker circuit including an acoustic frequency filter comprising the steps of, applying a step or impulse signal to the input of the loudspeaker, analyzing the amplitude and phase spectrum of the acoustic output of the loudspeaker, adjusting the magnetic coupling between an inductance and second circuit in a filter in the loudspeaker to provide a linear phase response within and outside the pass band of the filter and smooth roll-off of the amplitude response from the pass band through the crossover frequency, and, repeating the above steps for a second filter in the loudspeaker until a substantially flat amplitude response through the crossover frequency between the filter pass bands is obtained.
Claim 31
Independent Claim
120 words
The method of optimizing the performance of an electric loudspeaker circuit including an acoustic frequency filter comprising the steps of, applying a step or impulse signal to the input of the loudspeaker, analyzing the amplitude and phase spectrum of the acoustic output of the loudspeaker, adjusting the magnetic coupling between an inductance and second circuit in a filter in the loudspeaker to provide a linear phase response within and outside the pass band of the filter and smooth roll-off of the amplitude response from the pass band through the crossover frequency, and, repeating the above steps for a second filter in the loudspeaker until a substantially flat amplitude response through the crossover frequency between the filter pass bands is obtained.
Claim 32
Dependent Claim
48 words
The method of claim 28 including the additional step of further adjusting at least one magnetic coupling to fine tune the flat amplitude and linear phase response for minimum energy input to the loudspeaker for a given level of sound intensity at the expected position of the listener.
Claim 33
Dependent Claim
100 words
In an electric loudspeaker circuit comprising at least one electroacoustic driver, an acoustic frequency filter connected to said driver, said filter including a capacitance and a resistance in series with each other and in series with said driver and a first inductance in parallel with said driver, the improvement characterized by, a second circuit comprising at least one inductance, said inductance in the second circuit positioned for magnetic coupling to the first inductance, said first inductance and second circuit being selected and adjusted for substantially linear phase response of the driver and filter combination within and beyond the pass band.
Claim 34
Dependent Claim
100 words
In an electric loudspeaker circuit comprising at least one electroacoustic driver, an acoustic frequency filter connected to said driver, said filter including a capacitance and a resistance in series with each other and in series with said driver and a first inductance in parallel with said driver, the improvement characterized by, a second circuit comprising at least one inductance, said inductance in the second circuit positioned for magnetic coupling to the first inductance, said first inductance and second circuit being selected and adjusted for substantially linear phase response of the driver and filter combination within and beyond the pass band.
Claim 35
Dependent Claim
15 words
The electric circuit of claim 28 wherein the second circuit inductance comprises a shorted coil.
Claim 36
Dependent Claim
20 words
The electric circuit of claim 28 wherein the second circuit inductance comprises a metal ring surrounded by the first inductance.
Claim 37
Dependent Claim
24 words
The electric circuit of claim 30 wherein the metal ring is physically positioned within the first inductance to provide the substantially linear phase response.
Claim 38
Dependent Claim
19 words
The electric circuit of claim 30 wherein the depth of the metal ring within the first inductance is adjustable.
Claim 39
Dependent Claim
14 words
The electric circuit of claim 28 wherein the second circuit includes a shorting switch.
References Cited (Backward Citations)
US1931235A
Cited
US1907723A
Cited
US2452560A
Cited
US2612558A
Cited
US2727949A
Cited
US2957124A
Cited
DE1108268B
Cited
US3239782A
Cited
US3457370A
Cited
US3684993A
Cited
US3838216A
Cited
US3838215A
Cited
US4031321A
Cited
US4015089A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-08 | 1985-08-10 | 1986-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-08 | 1989-08-10 | 1990-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-08 | 1993-08-10 | 1994-02-09 | $7700.00 | Window Closed / Lapsed |