EP4302487A1

EP4302487A1 - Sound wave guide system for sound reproduction in speakers

Info

Publication number: EP4302487A1
Application number: EP22714106.6A
Authority: EP
Inventors: Rüdiger Lanz
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-03-01
Filing date: 2022-02-24
Publication date: 2024-01-10
Also published as: DE102021104822A1; DE102021104822B4; CN117178566A; WO2022184209A1

Abstract

The invention relates to a sound wave guide system for sound reproduction in speakers. The problem addressed by the invention is that of providing a sound wave guide system in the form of a horn for transmitting acoustic sound waves which works in combination with a sound source and which continuously conducts and deflects the sound waves. This is achieved according to the invention by means of a horn which emits the sound waves, proceeding from a horn neck opening having a smaller end area to a horn mouth having a larger end area, into the environment. The horn neck is divided into at least two sound channels by at least one vertical separating wall. The horn neck transitions into a horn funnel, which ends at the horn mouth and in which a sound-deflecting body is disposed. The sound-deflecting body proceeds, as an extension of the separating wall, from a lower edge, expands, and tapers again toward the horn mouth. The vertically extending cross-sectional area of the horn neck perpendicular to the longitudinal axis of the horn has at least 80% of the vertically extending cross-sectional area of the horn neck perpendicular to the longitudinal axis of the horn at the transition to the horn funnel. Guide channels for deflecting the acoustic sound waves are formed between the sound-deflecting body and the horn funnel. The horn funnel is divided, by horizontally extending segment walls, into a plurality of sound compartments extending one over the other in parallel.

Description

Sound wave guide system (wave guide) for sound reproduction in loudspeakers

The present invention relates to a sound wave guide system for sound reproduction in loudspeakers. In the professional field of loudspeaker applications, for example at concerts, at indoor sports events or the like, there are often poor acoustic conditions in the available hall-like rooms. It is therefore necessary here to use all possible techniques for the efficient control of loudspeakers and in particular the directing of wide sound frequency bands. One of the main improvement options here is the control of the direction of the radiation of sound waves over the entire audio spectrum in order to further improve the existing concepts of sound systems.

A distinction must be made here between an omnidirectional loudspeaker (also known as a radial radiator or all-round radiator) as a sound-generating system that ideally radiates evenly in a spherical shape, and loudspeakers that radiate multidirectionally, which is what is striven for in the field of stage technology.

It is a major challenge, particularly at indoor events such as concerts, to control and so that the entire area of the audience receives good quality sound, the difficulty being being able to place the audience close to the stage and therefore also close to the speaker systems. Ideally, the efficient control of the sound radiation and its alignment by the loudspeaker system does not change anything in the original signal reproduction. Indifferences or acoustically negative vibrations caused by reflections on surfaces in the environment lead to losses of sound energy, which is why directing the sound in the intended direction means a significant improvement in the utilization of the performance of a sound system.

A certain type of arrangement and housing in the form of loudspeaker columns, so-called vertical linear arrays, has prevailed, particularly in the case of sound reinforcement for concerts, since the possibility of a directional effect of the sound is given here. Supported by modern digital electronics, in particular Digital Signal Processing (DSP), it is currently possible to overcome or significantly improve the structural limits of the sound quality of line array systems by using these technologies. With these DSP units, it is possible to improve the emissions of sound sources arranged one above the other, such as those arranged in line arrays, by avoiding interference due to overlapping in the sound output by using controlled sound delays or phase shifts of the individual loudspeakers will.

But even the possibilities that result from DSP do not overcome all the acoustic problems and limitations of these speaker systems. In particular, correcting the sound quality at the expense of the required sound pressure is problematic. The goal is a linear frequency response of the sound with linear phase behavior without interference. Ideally, the entire room covered with sound should be supplied with the same signal at a sufficient level. When several loudspeakers are combined, however, there are areas of overlap in the form of interference, the bad ones Effect sound through cancellations in the frequency image. Depending on the phase position, this leads to these unwanted cancellations at certain frequencies of identical sound waves sent from at least two different loudspeakers, and to amplification at other phase positions. As a result, this leads to a deformed frequency response with unsatisfactory sound results as a result.

In this context, it is known, in addition to digital signal adjustment, to also structurally achieve the sound alignment and deflection by means of acoustic horns arranged in front of the loudspeakers. This is aimed at in particular in order to achieve the widest possible sound radiation and thus in particular to provide the front areas of a concert hall, for example, with better sound, since the deflection of the sound can now also provide the audience with better sound, which is close to the speakers.

When the sound of a loudspeaker device is radiated in a number of directions, it is known in the prior art to place horn-like constructions in front of a loudspeaker in order to correspondingly deflect the sound radiation. In particular, the vertical radiation behavior, to generate a flat and thus isophasic wave or wavefront, is much more difficult to implement. There are different approaches to this in the high-frequency range. What they all have in common is the use of sound wave guide systems or so-called wave guides. In terms of design, these are horns to which a conventional high-frequency driver is connected or which is arranged in front of it and whose sound exits the horn opening in phase.

The publication DE 4108 409 A1, for example, discloses such a deflected sound emission and sound pressure amplification. For this purpose, all conductive channels are disclosed, which widen like a horn, which is also referred to as a so-called ring horn. Another similar horn-like construction is disclosed in DE 19849 401 A1, the aim of which is large-area acoustic radiation from a loudspeaker device. A publication that discloses the basic principle of sound deflection is also GB 248061 A, in which a deflection device deflects the sound in various directions after the sound pressure generated by the device has been amplified by a horn. The publication DE 102007 019 450, which has a sound funnel that deflects the sound generated by a loudspeaker device, is also based on this technical principle. A horn neck leads in a funnel shape from the end of the loudspeaker to the sound deflection, with the sound exiting the device radially through a cone-like volume body.

An omnidirectional loudspeaker device is also disclosed from the publication GB 2459 338 A with a horn having an axial sound entry opening and a radial exit opening. In this case, a tweeter and a bass loudspeaker are arranged in opposite directions to one another, with a rotationally symmetrical arrangement relative to the longitudinal axis being provided.

A further sound deflection arrangement is known from the publication DE 410 8409 A1, in which a funnel-shaped structure causes a kind of ring horn, whereby, according to the invention, the sound should be evenly distributed in a room. For this purpose, the ring horn is placed in front of the membrane of a loudspeaker and continuously increases the space for sound expansion over the path of the sound length.

Another loudspeaker system is disclosed in GB 2302 231 A, which transmits the sound through a straight sound channel from the loudspeaker. Due to the widening of the canal over the length of the sound path, this pre- Direction also as a horn and causes an increase in sound pressure, whereby the omni-directional radiation of the sound is effected through the rear sound outlet openings.

Finally, publication EP 1635 606 B1 discloses a public address system with adjustable directivity, the system having a loudspeaker housing with an expansion guide with a movable flap which is displaced parallel to a plane by a predetermined movement. Another speaker cabinet forms a line source assembly with the first cabinet and includes a moveable door that is translated independently of the former door, with the line source assembly extending along a cross-plane direction.

Against this background, the object of the present invention is to create a sound waveguide system for sound reproduction in loudspeakers, which represents an improvement over existing waveguides. The sound should be optimally aligned or distributed in a multidirectional manner in front of the loudspeaker, with interference and sound distortions being avoided and the sound generated being radiated particularly evenly.

According to the invention, this is achieved by a novel sound wave guide system with the features of claim 1. The subclaims relate to advantageous refinements of the invention,

In contrast to the built-in waveguides in line arrays, the present sound waveguide system has a horn neck in front of the sound transducer, which makes up about half of the total length of the horn as a sound waveguide system and is therefore based on the classic designs of an EXPO horn or CD horn. It is essential here that this horn neck is placed directly on the sound transducer and has a horn neck entrance that absorbs the entire emitted sound of a sound transducer, i.e. completely covers it in terms of surface area.

The central task of the horn neck is to give the sound m generated by the sound transducer room to expand before the actual deflection process of the sound waveguide or waveguide begins. It has been shown here that the sound emitted by the tweeter can be radiated optimally through this extended horn neck due to the free expansion in the horn neck and can be expanded without distortion or distortion effects.

It is already provided according to the invention that this expansion in the horn neck is already supported by a first widening. This means that, starting from the diameter of the sound transducer or tweeter, there is a widening at least in the vertical course of the horn neck. This means that a trapezoidal widening of the horn neck would be visible in a lateral view of the horn neck. A widening in the horizontal axis is also possible here, but not mandatory in a basic design of the sound waveguide according to the invention.

This basically results in a constructive subdivision of the sound waveguide according to the invention in the form of a horn into the horn neck and the horn funnel, which causes the actual deflection and thus the multidirectional alignment of the sound.

In this case, the horn neck is also designed in such a way that it has at least two guide chambers, which are separated by a partition wall running vertically. This dividing wall is offset slightly forwards in the longitudinal direction of the horn neck in relation to the attachment surface to the sound transducer itself, so that there is not yet a vertical dividing wall directly in front of the sound transducer. In an expedient design of the invention, this is arranged, for example, at a distance of about 1 cm from the sound transducer. This means that from this point on the horn neck is divided into two equal halves by a vertical central partition so that there are two parallel, vertically aligned chambers in the horn neck invention consists of several sections, which cause the widening of the horn neck at a different angle to one another. This means that the horn neck widens in the shape of a flower transversely to the course of the horn neck and thus forms the shape of a "constant directivity" (CD) horn in cross section, with the angle of these successive sections relative to the longitudinal axis of the horn increasing is angled up to about 70° The surfaces of the horn, which run at several angles to the longitudinal axis of the horn, result in a gradual deflection of the sound components guided on the horn wall, which counteracts the sound that is to be guided along the wall being broken off deflect a relevant portion of the sound strongly to the side Alternatively, a design in the form of an expo would also be possible

Horns with a wall progression in the form of an exponential function makes technical sense, i.e. the widening of the funnel occurs in a curve and not through angled surfaces as previously described. However, the design in the form of a horn progression analogous to that of a CD Horns preferred.

In an expedient design of the invention, the widening of the horn, starting from the horn neck, is carried out in at least three mutually angled sections which flatten further in relation to the longitudinal axis of the horn and which can be of different lengths. It has proven to be expedient here to let the last section of this horn, which diverts the sound, run at an angle of approximately 70° to the longitudinal axis of the horn neck and make it the longest. The advantages according to the invention when aligning the sound from this sound waveguide according to the invention lies in a combination of a sound deflection body arranged in front of the horn neck exit with a sectioning of the sound exit surface from the horn funnel. This means, on the one hand, that the horn funnel has a vertically arranged sound deflection body, centrally over its entire height, which has a very specific shape in order to bring about a desired sound deflection effect. In cross-section, this sound deflection body can be described as approximately flame- or drop-shaped, with the sound deflection body widening as an extension from the contact line to the partition of the horn neck and converging again from its widest point to its tip. This means that the dividing wall of the horn neck transitions into the sound deflection body, with a widening from the flame-shaped sound separating body taking place in a roughly progressive curve, i.e. the widening towards the full width of the sound deflection body in its lower section emanating from the horn neck is not straight but rather first slightly angled relative to the longitudinal axis and then steadily increasing angled, in order to then gradually approach the longitudinal axis again until the widest point of the sound deflection body is reached.

After reaching the widest point of the sound deflection body, this body again converges to the droplet or flame tip, with the course of the cross section of this separating body following a tendentially straight or slightly curved curve course. This means that in the transition area to the dividing wall of the horn neck, the widening to the drop-shaped body takes place over a longer distance and rises more gently than when converging to the tip at the horn sound outlet, because here there is a shorter distance for the two flanks of the sound separating body to converge consists.

In contrast to the classic expo and CD horns, the concern with the present one is constructive

Solution that no or only very small sound components can escape directly through the horn. Therefore the sound Deflection body arranged in front of the horn neck in such a way that no or only very small proportions of the sound emitted by the transducer exit the horn without deflection.

On the one hand, this is caused by the design of the sound deflection body in front of the horn neck in the transition to the horn funnel, which forces the sound to be deflected around this sound deflection body. On the other hand, it is also due to the vertical partition wall in the neck of the horn, which counteracts sound escaping from the sound transducer past the sound deflection body without deflection. The aim is not to allow direct tweeter sound to reach the ears of the audience in a concert hall, for example, as this leads to negative sound changes or distortions.

In an advantageous design of the invention, it is therefore provided that the width of the sound deflection body in front of the horn neck is slightly larger than the exit width of the horn neck itself. A ratio of the horn neck exit opening to the width of the sound deflection body of, for example, 1:1.2 has been found to be advantageous. In this way, only to a very small extent can a diagonal sound emerge laterally around the deflection body and thus the majority of the direct sound waves just radiated can be deflected.

This has the advantage that a peak of the central sound output of the tweeter that normally occurs in the frequency band is now redistributed by an open horn into a deflected sound component, which leads to a significant sound improvement and better spatial distribution of the sound emitted by the tweeter. At this point, however, improvements in sound have also been achieved with designs in which the sound deflection body was approximately the width of the horn neck, since the combination of the elongated, divided horn neck with the sound deflection body placed in the bell has already had a clearly positive effect results. The dividing wall in the horn neck, which begins about one centimeter in front of the loudspeaker, thus advantageously prevents a person standing to the side in front of the loudspeaker sound system or line array from being exposed to a sound component radiated directly through the horn neck. The separation channel segments the horn neck and thus narrows the area in which sound can exit diagonally through the horn neck and thus also reduces this proportion of sound exiting diagonally past the sound deflection body. And even this part of the sound, which can still be emitted diagonally to a small extent, does not come straight out of the sound horn, but rather in a diagonal orientation, which reduces the negative impact on the overall sound image.

Even if a greater width of the sound deflection body of about 10 percent compared to the width of the horn neck is considered to be the ideal design, designs with a slightly smaller width or the same width as that of the horn neck should also be considered as the subject of the present invention.

In the state of the art there are often guide channels or a deflection body directly in front of the sound transducer, since in this way the sound channel is immediately narrowed, which leads to an increase in the dynamics or the sound pressure. This increase in dynamics is deliberately dispensed with in the present invention in favor of the free radiation of the tweeter into the open horn neck, which initially enables the sound to radiate freely. It has been shown that in this way, according to the invention, rattling noises and distortions can be greatly reduced or avoided, which is often used in a design that is built in front of the loudspeaker and partially covers it directly in order to increase the sound pressure.

Due to the central insertion of the sound deflection body in an approximately teardrop-shaped arrangement after the horn neck, the normally existing with Expo or CD horns Sound peak in the middle of the tweeter removed. It has been shown that around 50% of the sound is deflected to a lateral radiation. Other sound components wrap themselves around the roughly droplet- or flame-shaped wedge of the sound deflection body and thus emerge roughly centrally and frontally from the horn's bell.

Other sound components break off during the deflection around the central sound deflection body and are radiated as a sound component in an area between the frontal radiation and the laterally deflected radiation. This is the ideal goal of the present invention, that in addition to the laterally deflected sound components, sound components that are also emitted frontally and sound components that are scattered between these two areas also remain. This results in a flat and homogeneous release of the

tweeter sound over the area spectrum of the sound-deflecting tweeter horn.

The invention is explained in more detail below with reference to drawings. FIG. 1 shows the prior art in the form of a constant directivity horn;

FIG. 2 prior art in the form of an expo horn;

FIG. 3 prior art in the form of a slot radiator;

FIG. 4 prior art in the form of a multi-channel horn;

FIG. 5 shows a design of the horn according to the invention in a frontal view into the horn mouth;

FIG. 6 shows a design of the horn according to the invention in a laterally sectioned view; FIG. 7 shows a design of the horn according to the invention in a side view;

FIG. 8 shows a further design of the horn according to the invention in a frontal view into the horn mouth;

FIG. 9 shows a further design of the horn according to the invention in a laterally sectioned view;

FIG. 10 shows a further design of the horn according to the invention in a side view and

FIG. 11 shows a perspective view of the horn neck 7 of a design of the horn according to the invention.

Figure 1 shows a combination of a frontal view of a so-called CD horn, the abbreviation CD for "constant directivity", i.e. a constant directivity in relation to the emitted sound. This simplified illustration shows a transition from the horn neck to the horn funnel or the horn mouth designed in such a way that the funnel-shaped horn mouth consists of several flat side surfaces with different angles relative to the longitudinal axis of the

Horns is composed. The aim here is to focus evenly over the entire frequency range used and thus to change the sound character less in comparison to an exponential horn, for example. The exponential horn or expo horn, which is also shown as prior art, is shown frontally and in section in FIG. Here it can be seen that the cross-sectional area of the horn, starting from the neck, widens according to an exponential function. A hyperbolic funnel develops with increasing flattening towards the horn mouth. In the elongated and narrow neck of the horn, the wave fronts are more strongly curved and cancellation and reflection occur, which has a negative effect on the sound. FIG. 3 again shows a combination of a front view and a section through a so-called slit radiator. Here, a sound deflection body is placed directly in front of the sound transducer and causes an increase in the sound pressure and an alignment of the sound, deflected around this sound deflection body in narrowed channels towards the horn mouth or the sound outlet of the slot radiator. Disadvantages here are the uncontrolled radiation behavior and interference, particularly at high frequencies. Finally, to explain the status of

Technique Figure 4 shows another type of horn frontally and in section. This is a horn construction in which the sound, starting from the sound transducer, is guided directly into deflection channels which, when arranged one above the other, cause a multi-directional alignment. An example of this in the prior art is patent publication EP 1 358 651 A, in which such a loudspeaker horn system is disclosed.

FIGS. 5 to 7 now show different views of the sound waveguide system according to the invention in the form of a wave guide or horn, which is placed directly in front of a tweeter as a sound converter 9 . This is made up of a horn neck 7 that receives the sound, which merges into a horn funnel 1 with the sound outlet in the form of a horn mouth. Structurally, this solution builds up

"constant directivity" horns, since it is also provided in this exemplary design to use different flat expansions of the horn funnel 1, which are angled differently to the longitudinal axis of the horn, as horn funnel surfaces, as is clearly shown in FIG.

FIG. 6 shows a section A-A through the horn funnel, as shown as a front view in FIG.

FIG. 5 shows in the front view that a segmentation over the cross section of the sound funnel by segment walls 10 which are arranged parallel vertically one above the other. These segment walls 10 create sound fans 2, which segment the horn funnel 1 vertically one above the other up to the horn mouth and thus bring about a directional effect of the sound. It has been shown here that it is advantageous for the alignment of the sound, particularly with regard to the overlays when used in a line array, to close the sound fans 2% with the upper and lower horizontal housing walls by reducing the distances between the upper ones and lower horizontal housing wall to the segment walls 10 of these sound fans 2 'with a smaller width.

FIGS. 5 and 6 also show the sound deflection body 3 in a plan view and in section, which forms an extension of a central partition 5 in the horn neck 7 . In the design presented, the horn neck 7 has only one central partition 5, which causes the horn neck 7 to be segmented into two sound channels 6.1 and 6.2.

This central partition 5 leads to the sound deflection body 3, which widens in a gently widening curve to the roughly centrally located widest point of the sound deflection body, and then converges approximately in a straight line to the tip 11 of the sound deflection body 3. In the illustrated design, the sound deflection body 3 is drop-shaped or flame-shaped, with the upper and lower

Tip are formed similarly shaped. In an advantageous design that is not shown, the lower tip of the sound deflection body 3, which extends from the partition 5 of the horn neck 7, is significantly longer than the flatter tip that leads into the horn mouth of the horn funnel 1 an advantageous deflection of the sound around the sound deflection body 3.

This central sound deflection body 3 overcomes problems that classic horns, such as CD or expo horns, have by converting the central peak of the sound output of an open horn into deflected sound, the mul- is oriented bi-directionally. On the one hand, this leads to a deflection, to a lateral direction following the course of the horn funnel 1, but also to sound components that move along the sound deflection body 3 and thus emerge approximately centrally from the horn mouth of the horn funnel 1.

Finally, sound components are also present which move between these two areas of a central radiation and a laterally deflected radiation, in that they are either oriented in a detaching manner from the horn funnel surfaces 4 or are correspondingly deflected by the sound deflection body 3 . Here the directional arrows shown as examples in FIG. 6 represent different deflections of the sound in the horn funnel 1. In the sectional drawing of FIG

Looking at the segment wall 10 shown behind the sound deflection body 3, that it completely encloses the sound deflection body 3 in the present design of FIGS. This is also clear from FIG. 7 in the side view, since the sound deflection body 3 is shown here as a hatched area, which is subdivided into the present sound fans 2 by the segment walls 10 . This means that the sound fans 2 completely enclose the sound deflection body 3 .

In the present design, this also means that the upper edge of the segment walls in the sectional figure 6 is not formed as a straight horizontal line but rises slightly from the slightly lower side edges 12 of the horn funnel 1 to the tip 11 of the sound deflection body 3 .

This is the essential difference to the other design shown in FIGS. 8 to 11, since here, as is clear from FIG. This is also clear in the lateral representation 10, since now the over the side edge 12 of the horn funnel 1 protruding tip 11 of the sound deflection body 3 is shown as unseg- mented. The segment walls 10 only lead to the side edge 12 of the horn funnel 1.

This does not initially result in any changes in the representation of the course of the sound, since these continue to be deflected on the walls of the sound funnel 1 as well as around the sound deflection body 3 . The differences in the effect of the two designs are that the design shown in FIGS. 5-7 has segment walls that run to the tip of the sound deflection body compared to this somewhat simplified design in FIGS. This is advantageous because this lengthening has a positive effect on greater efficiency and a lower separation coupling frequency towards the midrange. The sound is also directed in a better controlled manner.

The further FIG. 11 shows a view into the entrance of the horn neck 7, which is designed round according to the sound transducer to be covered. For example, a tweeter on which the horn neck is placed can be completely covered and there is therefore no loss of sound emission.

In this design, the conversion of the circular receptacle of the horn neck 7 into the later quadrangular cross-section takes place in a relatively short distance. However, this representation is only to be understood as an example here, since this transition can be made shorter or longer and can therefore have a smoother transition from the round to the angular cross section. It is also important here that on the one hand the sound is completely absorbed and on the other hand an optimal possibility of a distortion-free unfolding of the sound in this horn neck transition is possible.

In principle, this horn-like redesign of a wave guide according to the invention can also be used in other loudspeaker applications in addition to the application mentioned in a line array. are used. In the line array, several loudspeakers are arranged with these wave guides one above the other in a slightly curved arrangement relative to one another. However, individual applications in loudspeakers in combination, in particular with bass sound transducers, or even with a correspondingly larger design in combination with only one sound transducer are also intended and expedient.

Claims

patent claims

1. Sound wave guide system (wave guide) in the form of a horn for the transmission of acoustic sound waves with a

Sound transducer interacts as a sound source and continuously transmits and deflects the sound waves, starting from a horn neck opening (13) with a smaller end surface, which forms the open end of the horn facing the sound transducer, to a horn mouth with a larger opposite a horn neck (7) widened end surface, which forms the opposite open end of the horn and emits the acoustic sound waves to the environment, characterized in that - the horn neck (7) is separated by at least one vertical partition (5) into at least two sound channels (6.1 and 6.2) is divided,

- the horn neck (7) merging into a horn funnel (1) ending in the horn mouth, - a sound deflection body (3) vertically dividing the horn funnel (1) and spaced from the horn neck (7) is arranged in the central rail,

- which, as an extension of the partition (5), extends from a lower edge (14), widens and tapers again towards the mouth of the horn, with the vertically running cross-sectional surface of the sound deflection body (3) at its widest widening (16) transverse to the longitudinal axis of the horn has at least 80% of the vertical cross-sectional area of the horn neck (7) transverse to the longitudinal axis of the horn at the transition to the horn funnel (1),

- guide channels (15) for deflecting the acoustic sound waves being formed between the sound deflection body (3) and the horn funnel (1),

- and the horn funnel (1) at least partially by horizontally running zontally and resting on the sound deflection body (3).

Segment walls (10) are divided into several parallel sound fans (2) one above the other.

2. Sound waveguide system according to claim 1, characterized in that the cross-sectional area of the sound deflection body (3) transverse to the longitudinal axis of the horn is greater than or equal to the cross-sectional area of the horn neck (7) transverse to the longitudinal axis of the horn, or these cross-sectional areas have a ratio of 1, 2:1.

3. Sound wave guide system according to claim 1 or 2, characterized in that

- the horizontal cross-sectional area of the sound deflection body (3) is designed in the shape of a flame or drop in the longitudinal axis of the horn, - the widening of the sound separating body (3) starting from the partition (5) of the horn neck (7) being approximately follows a progressive curve up to the full width of the sound deflection body (3) and, after the widest point, converges to a tip (11) of the sound separating body (3) at the mouth of the horn.

4. Sound waveguide system according to claim 3, characterized in that the length of the widening section starting from the partition (5) of the horn neck (7) up to the full width of the sound deflecting body (3), measured in the longitudinal direction of the horn, is 1.5 to 2.

5 times the length of the tapering section of the sound-insulating body (3) after its widest point up to its tip (11). b. Sound waveguide system according to one of the preceding claims, characterized in that - the horn funnel (1) is designed to be widened in several vertical horn funnel section surfaces (4) relative to the longitudinal axis of the horn,

- The angles of these successive sections relative to the longitudinal axis of the horn increase up to about 70° for the gradual deflection of the sound components guided on the horn funnel wall.

6. Sound waveguide system according to one of the preceding claims, characterized in that the horizontal segment walls (10) lying against the sound deflecting body (3) up to the tip (11) of the sound deflecting body (3) pointing towards the horn mouth and these are designed to enclose completely or the tip (11) of the sound deflection body (3) is designed to project beyond the upper edge of the segment walls (10) ending in the mouth of the horn.

7. Sound waveguide system according to one of the preceding claims, characterized in that the horn neck (7) widens in a trapezoidal manner in its vertical plane from the horn neck opening (13) starting to the horn funnel (1).

8. Sound waveguide system according to one of the preceding claims, characterized in that the at least partial subdivision of the horn funnel (1) by horizontally running segment walls (10) resting on the sound deflection body (3) produces a plurality of sound fans (2) running parallel one above the other, which due to varying distances between these segment walls (10) are designed with different widths,

9. Sound waveguide system according to claim 8, characterized in that the sound fans (2') terminating with the upper and lower horizontal housing wall have reduced distances between the upper and lower horizontal housing wall and the segment walls (10) delimiting these sound fans (2'). are formed smaller width.