DE2224950A1 - Loudspeaker system for an acoustic pulsato arrangement - Google Patents

Description

Wpl..Phye. W. Kilko "

Patent attorney

Dr. phil. G.B. HAGEN 2224950

Patent attorney

MUNICH 71 (Solin)

Franz-Hals-Strasse 21
Telephone 796213

GBS 3049 Munich, May 21, 1972

NS

Columbia Broadcasting System, Ine, 51 West 52nd Street

New York, NY '10019, V. St. A.

Loudspeaker system for an acoustic pulsato arrangement

Priority; May 26, 1971; V. St. A .;

147 022

The invention "relates to loudspeaker systems and, more particularly, to high-performance loudspeaker systems which are used as acoustic pulsato arrangements are formed.

Many acoustic instruments, such as B. Trumpets and trombones can produce extremely loud sounds. A electronic instrument such as B. an organ or an electric guitar, which at a concert together with a wind instrument how a trumpet is played requires a high degree of amplification. It achieves high levels of performance that a plurality of loudspeakers are driven by a common high-power amplifier. Up to ten loudspeakers can be arranged more or less crowded in a common box.

Musicians insist on the use of acoustic pulsato arrangements. Such an arrangement is not so compact. For example, each loudspeaker must have one assigned to it

209851/104 2

Bayerische Vereinsbank Munich 820993

Have rotary tone channel. Such rotary tone channels are not efficient in terms of generating high sound levels, since the sound radiation characteristic is inevitably rotated by 360 °; as a result, the sound becomes over the distributed throughout the room.

The main object of the invention is to provide a relatively compact pulsato loudspeaker that is more effective Way can produce high sound levels.

A reflector is provided to solve the aforementioned problem. While a conventional reflector generates a beam from a stationary source, the reflector generates according to FIG of the invention a beam from a moving source, the distance between the reflector wall and the source changes in such a way that it creates a cyclic Doppler or pulsato effect. That way the reflector has the extraordinary double effect that sound energy is directed in a certain direction and a fully vibrating one Pulsato effect is created.

In one embodiment of the invention, the reflector has two wing plates on opposite sides of a loudspeaker mounting plate on, wherein the wing plates extend at an angle of 45 ° to the mounting plate. the Pulsato runners are mounted in front of the common mounting plate, and for each runner is behind the mounting plate a stationary loudspeaker is provided. In another embodiment of the invention, a plurality of Pulsato drums stacked coaxially along the reflector axis. In this case, each drum carries a loudspeaker rotating with it. In both embodiments Not only is the acoustic performance maximized, but the pulsato effect is also extraordinary reinforced.

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The invention is described below on the basis of an exemplary embodiment with reference to the figures. Of the figures show:

Figure 1 is a pictorial representation of a loudspeaker system according to the invention;

Figure 2 is an enlarged cross section along a Plane corresponding to line 2-2 of Figure 1;

Figure 3 is a vertical section along line 3-3 of Figure 2;

FIG. 4 is a partial elevation of the speaker system of FIG at the front, showing the runners arranged one above the other;

FIG. 5 is an enlarged partial sectional view taken along line 5-5 of FIG. 2;

FIG. 6 shows a dimensional representation of a modified embodiment of the invention;

Figure 7 is a plan view of the speaker system of Figure 6;

Figure 8 is a plan view from the front, with part of the

Box structure is broken away and shown in section; and

FIG. 9 shows a section along the line 9-9 of FIG.

Four speakers 10, 12, 14 and 16 are on the rear. a mounting plate 18 supported one above the other. The mounting plate 18 is enclosed in a box having a top 20, a bottom 22 and side walls 24 and (cf. also FIG. 2) and a rear wall 28. The speaker mounting plate 18 is in the front opening of the box, with the top and bottom edges on the inner surfaces of the top wall 20 and the bottom wall, respectively issue.

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A pair of reflector panels or walls 30 and 32 complete the speaker cabinet. The one Reflector wall 30 (Figure 2) extends inwardly below from the front vertical side edge of the box opening at an angle of approximately 45 ° to the corresponding side of the speaker mounting plate 18. In the same way, the other reflector wall 32 extends from the vertical side edge the box opening to the corresponding side of the mounting plate 18. As a result, the sound is emitted from the front, so that the acoustic performance is maximized.

The speakers are all powered by the electrical power output a musical instrument, for example an electric organ, an electric guitar or the like. Amplifiers can advantageously be placed behind in the lower part of the housing the reflectors 30 and 32 are arranged.

The axes a, b, c, and d of the loudspeakers 10, 12, 14 and 16 run horizontally and are spaced apart in the vertical direction arranged one above the other, with the loudspeakers facing the front of the box opening. It's like the sounds To conduct outside, four openings are provided in the plate 18, of which the opening 34 is shown in FIG. Every Opening is an opening composed of a large number of smaller openings. Together they form smaller openings a circular arrangement, so that a central hub 36 carrying spider is formed. The speaker 10 is mounted on a U-shaped bracket 38, the is mounted behind the opening 34 on the mounting plate 18. A cylindrical attached to the inside of the bracket 38 Section 39 conducts the sound from the loudspeaker 10 to the area adjacent to the composite opening 34.

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The sounds passing through the opening 34 are acted upon by a pulsato runner 40 attached to the front of the mounting plate 18 ". In this example, the pulsato runner 40 is of the type described in US Pat . No. 3,315,760.

The pulsato runner 40 is mounted coaxially with respect to the corresponding loudspeaker 10. To this end is a Pair of bearings are provided for opposite ends of the rotor, with one of the bearings (not shown) on a TJ-shaped Bracket 42 (Figure 1) is mounted, which spans the rotor, and the other bearing 43 (Figure 5) on the hub 36 of the composite aperture 34 is mounted. A shaft 44 carried by the bearings in turn carries the pulsato rotor 40. An inner shoulder of the shaft 44 has a pulley 46 in order to transmit a rotary movement to the rotor on. A motor 48 (Figure 2) provided on the inside of the plate 18 drives the pulley 46 via a belt 50 at.

For creating characteristic vibrato and tremolo the runner 40 rotates the sound characteristic in such a way that the same at a speed of five to eight Periods per second is repeated. For this purpose, the runner 40 guides the sound to a circumferential opening.

The pulsato runner 40 has a channel with a narrowing area 52 (FIG. 5) at the one in alignment with the plate opening 34 Runner side on. The channel has a lateral mouth opening 54 (see. Also Figures 1, 2 and 4), the one Describes circular path.

Identically designed pulsato runners 56, 58 and 60 are provided for the other three loudspeakers 12, 14 and 16. Everyone Pulsato runner is provided with its own motor drive, which is arranged on the inside of the mounting plate.

209851/1042

The runners do not need to be synchronized.

The orbits of the runner openings are made to be horizontal Axes described. If the listener is not quite far to the side relative to the rotor axes, only one can very little Doppler effect can be expected as the distance increases between the listener and the mouths of the channels changes only slightly during the rotation. Because of this, will a pulsato runner is usually arranged to be around a horizontal axis rotates, whereby the distance between the mouth of the sound channel and the listener changes periodically changed by an amount that corresponds to the diameter of the rotor. The easy assembly of the speakers and runners however, on the mounting plate is highly desirable. A good common rear baffle is provided; the components of the arrangement are accessible for repair purposes.

The side reflector plates 30 and 32 act with the Pulsato runners work together to produce a considerable range deviation even for one immediately in front of them the receiver located in the box. In this way, the distance between the orifice opening 54 and each of the two changes Reflector plates periodically by an amount that corresponds to the diameter of the Pulsato runner. Consequently a full, rich pulsato effect is achieved even though the runners themselves are crowded and arranged in a simple manner are.

In the modified embodiment of the invention according to FIGS. 6-9, a plurality of pulsato drums 80, 82, 84 and 86 arranged rotatably with the aid of a shaft 88, inter alia, a common vertical axis. Located in each drum a loudspeaker that opens radially outwards

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forming sound channel. The shaft 88 is powered by a motor 90, pulleys 92 and 94 and a flexible belt 96 rotated, all below a horizontal partition 98 are arranged in a box 100.

The box has a reflector 102 that has a simple generally parabolic curvature. Like the plates 30 and 32 of the previously described embodiment, the domed reflector 102 not only emits the sound with maximum output but also interacts with the speaker channels and increases the pulsato effect due to the fact that the distance between the reflector 102 and the opening of the sound channel changes periodically. The sound intensity for a given power unit is maximized,

Claims : 209851/1042

Claims (9)

Patent entitlements ( IJ loudspeaker system for an acoustic pulsato arrangement, characterized by a) a loudspeaker box having a front opening, which has on opposite sides (24, 26) of the opening Eeflektorplatten (30, 32), which in relation are angled towards each other and emit sound waves, b) a sound channel with a utd rotatable axis Sound output opening (54) from said axis one Has a distance and describes a circular path, c) means (44) for arranging said channel within the reflector plates (30, 32) so that the sound output opening (54) moves towards and away from the reflector plates (30, 32) when the channel rotates, whereby a Doppler effect is generated, d) motor drive means (48) for rotating said sound channel at such a speed that the Sound radiation pattern repeated at a desired rate witfd, and e) means for acoustically driving the sound channel. 2. speaker system "according to claim 1, characterized by a) one or more sound channels, each of which can be rotated around an axis and each has a sound output opening, which is arranged at a distance from the axis and describes an orbit, b) Means for arranging the one or more sound channels adjacent to and within the first-mentioned sound channel the reflector plates (30, 32), so that the Klangabgäbeöffnungen of the other sound channels during rotation move the further sound channels towards the reflector plates (30, 32) and away from them, thereby producing Doppler effects will, 209851/1042 c) means for rotating the other sound channels, so that the sound radiation characteristics of each with a desired Rate to be repeated, and d) Means for acoustically driving the further sound channels. 3. Loudspeaker system according to claim 2, characterized in that the former as well the further sound channels are formed by loudspeaker cones carried on drums (80, 82, 84, 86), the aforesaid Drums are arranged one above the other in a stack and are rotatable about a common axis which is parallel is provided at a focal point of the reflector means (102) and adjacent thereto. 4 · Loudspeaker system according to claim 2, characterized in that the former as well as the other sound channels through on the front side of a mounting plate (18) arranged runners are formed, wherein the axes of the runners are arranged at a distance from one another are and directed frontally with respect to the loudspeaker box are, and that the drive means are a plurality of speakers (10, 12, 14, 16) are. 5. Loudspeaker system according to claim 4, characterized characterized in that said reflector means is made up of a pair of angled mounds (30, 32), which connect to the sides of the speaker mounting plate (18). 6. Loudspeaker system according to claim 4, characterized characterized in that the reflector means consists of the loudspeaker mounting plate (18) and the Plate adjoining reflector plates (30, 32) exist that the runners (18) with their respective loudspeakers (10, 12, 14, 16) are coaxial and that the runners have radially outwardly directed sound openings that are laterally of 2 0 9 8 5 1/1 Q 4 2 30 + 9 - »- P224950 the runners are directed towards the lateral reflector plates (30, 32). 7. speaker system according to claim 6, characterized in that said box is a Has rear wall (28) and together with the mounting plate (18) a loudspeaker housing is formed. 8. loudspeaker system according to claim 6, characterized in that the motor drive means (48) are arranged behind the mounting plate (18). 9. speaker system according to claim 6, characterized in that each runner his has its own motor, which is provided behind the mounting plate (18). 209851/1042