Electrical audio signal processing systems and devices – Noise or distortion suppression – Hum or ground loop
Patent
1996-06-03
1998-10-13
Chang, Vivian
Electrical audio signal processing systems and devices
Noise or distortion suppression
Hum or ground loop
381 77, H04B 1500
Patent
active
058224416
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an improvement in the power amplifier/loudspeaker interface.
2. Description of the Prior Art
High fidelity loudspeakers comprise in general several channels to which are dedicated a certain frequency band to be reproduced. To do this, it is necessary to provide in the supply circuit of the loudspeaker, filters constituted by capacitances, inductances and resistances. Certain loudspeakers comprise only filtering components in series. Most of them, requiring a more complicated filtering, have them also in parallel. The diagram of Figure la shows such a filter on one channel of a multichannel speaker; this known mounting comprises a speaker Hp supplied by a circuit comprising two conductors 1 and 2, the conductor 1 being connected to the positive pole of the amplifier by means of the conductor LA and the conductor 2 to the negative pole by the conductor LR.
As is known, the conductor 1 comprises one or several filters F disposed upstream of the speaker Hp and, between the conductors 1 and 2, one or several filters Z such as Z1, Z2, Z3.
These filters are disposed in parallel such that they shunt the speaker Hp. The connection of these filters to the terminal E- of the loudspeaker is effected by the conductor 2.
A known variant of this wiring arrangement is shown in FIG. 1b.
It will be noted, and this is essential, that the different manners of wiring the loudspeakers all have this in common: the return from the terminal A of the amplifier is effected by one and only one common terminal E- of the loudspeaker, via a single conductor LR.
In the case of multi-amplifiers, there are as many terminals E+ and E- and of connection conductors LA and LR as of channels, but each channel is wired and connected to the amplifier or amplifiers according to a diagram of the type 1a or 1b.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a process for providing a high fidelity speaker comprising a speaker supplied by a first conductor connected to the positive pole of an amplifier and a second conductor connected to the negative pole and at least one passive filter mounted in parallel. The process includes the step of connecting the passive filter or filters to the negative pole of the amplifier by a return conductor or conductors independent of the second conductor connecting the speaker to the negative pole.
It is a further object of the present invention to provide a process for providing the aforementioned loudspeaker using as many return conductors as passive filters in parallel.
It is another object of the present invention to provide such a process for grouping certain passive filters on the return conductor or conductors.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1a is a schematic of a conventional multichannel speaker.
FIG. 1b is a schematic of another conventional multi-channel speaker,
FIG. 2 is a schematic of one embodiment of the present invention.
FIG. 2a is a schematic of a second embodiment of the present invention.
FIG. 2b is a schematic of a third embodiment of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The applicant has discovered that if, instead of connecting the elements Z1, Z2, Z3 in parallel to the single terminal E-, as is known and shown in FIGS. 1a and 1b, they are separately connected to the terminal A- of the amplifier by independent conductors L1, L2, L3, there is obtained a substantial improvement of the sound quality, as is shown in FIG. 2.
Thus, several professional musicians were listened to, principally violinists and cellists, whose recordings display their instruments, by using either a pair of loudspeakers mounted according to the diagram of FIG. 1a or 1b, or a pair of loudspeakers mounted according to the diagram of FIG. 2, the test being conducted blind, which is to say without knowing which was the pair of loudspeakers used. Each time, the difference was quickly and unambiguously noted.
The sounds produced by the loudspeakers modified by the prese
REFERENCES:
patent: 4031318 (1977-06-01), Pitre
patent: 4100380 (1978-07-01), Gosswiller
patent: 4229619 (1980-10-01), Takahashi et al.
Tremaine, Howard. "Audio Cyclopedia", Howard W. Sams & Co., Inc., pp. 1575-1578, Jan. 1979.
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