RU2786503C1 - Combined sound emitter - Google Patents

Abstract

FIELD: electroacoustics.

SUBSTANCE: invention relates to electroacoustics. The combined sound emitter contains a system of waveguides, the cross-sectional area of ​​which increases uniformly from the throat to the mouth of the waveguide, forming a horn. The design of the waveguides is such that the time of arrival of the sound wave from the compression drivers is the same for all rectangular holes in the mouths of the waveguides. A compression driver is attached to the throat of each waveguide, the mouth of each waveguide is formed by two adjacent rectangular holes, the distance between which does not exceed half the wavelength of the upper reproducible frequency. In this case, a cylindrical or toroidal wave front is formed at the cut of each rectangular hole.

EFFECT: increase in sound pressure level, control of such system parameters as frequency range, radiation pattern, radiator dimensions.

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Description

The field of technology to which the invention belongs

The invention relates to electroacoustics, in particular to audio systems, and in particular to a radiator device obtained by combining two or more compression electrodynamic heads (compression drivers) having a single sound field with specified characteristics.

State of the art

Some examples of acoustic systems and emitter devices are known from the prior art, however, they use compression drivers in conjunction with waveguides, which make it possible to obtain a cylindrical or toroidal wave front by folding them into arrays by sequentially arranging them along a cylinder or torus with short sides of the mouths to each other.

Patent US9204212 "MULTIPLE APERTURE SPEAKER ASSEMBLY" (IPC H04R1/32, priority: 05/05/2014) proposes methods and devices for waveguide structures and loudspeaker assemblies. In one embodiment, the waveguide may include an entrance aperture configured to receive an audio signal from a sound source and a plurality of isolated sound paths having substantially the same path length. Each isolated sound path may be formed within the waveguide body and have a curved path to reduce the depth of the waveguide. The waveguide may include a plurality of stubs, where each stub divides the output of one of the isolated sound paths into a plurality of output sound paths and defines a plurality of waveguide outlets. Each audio output path is characterized by a reduced width compared to the isolated audio output path, with the plurality of output ports configured to output a combined audio signal based at least in part on the plurality of audio signals.

Patent KR102097891 "Three-Dimensional Sound Guide for Speaker and Speaker Having the Same" (IPC H04R1 / 34; H04R9 / 06, priority 02/01/2019) discloses a stereo guide for a speaker and a speaker that includes it. In accordance with the present invention, a stereo guide for a speaker comprises a sound guide module which is formed in the form of a round or square cone to prevent mutual interference of sounds generated by the speaker and propagate sounds at different angles through a plurality of independent sound guide paths, and a plurality of guides spaced apart by at equal intervals to form sound guide paths within the sound guide module. According to the present invention, the guide is formed to form a plurality of independent sound guide paths inside the sound guide module and directs the sound generated by the speaker to the outside of the sound guide module with the sound guide paths and the guide. Therefore, it is possible to direct the sound at different angles while preventing mutual interference in the process of directing the sound, so that the sound can propagate far and clearly in a wide space.

Patent RU2617724 "ACOUSTIC SYSTEM WITH A SET OF INTERCHANGEABLE ACOUSTIC LENSES" (MPK G10K11/30, priority: 12/09/2015) describes an acoustic system with a set of replaceable acoustic lenses. an acoustic lens from a set of a plurality of acoustic lenses by means of quick-release fasteners made on the front walls of the acoustic system housing, each of which is made in the form of a trapezoidal prism with open oppositely located parallel side faces with the formation of the input and output holes of the sound channel, the side face from the side of the inlet passes into the waveguide, the shape of which corresponds to the shape of the output channel of the line array, the sound channel of the lens is divided into tracks by trapezoidal blades, horizontally or vertically located between the side walls of the lens, while each lens has horizontal opening angles and verticals different from other lenses.

Known patent document US7177437 "Multiple aperture diffraction device" (IPK H04R25/00, priority: 10/18/2002), which discloses a horn assembly for high-frequency acoustic speakers. In a speaker array, the distance between adjacent speakers must be less than the wavelength of the emitted sound for effective merging. For high-frequency sound, the relatively short wavelength limits this distance. Such restrictions are sometimes physically difficult to implement. The horn assembly enlarges the outlet of a small speaker to the desired dimensions by using one or more plugs that divide the large horn cavity into smaller horn cavities and create identical paths to them. Similar path lengths and smaller horn cavities having the desired dimensions allow efficient combination of the output sound. The output portion of the horn assembly can be sized to fit larger woofers, allowing for better tweeter placement compared to other larger woofers.

From the patent RU2760383 "SOUND BROADCASTING SYSTEM" (MPK G10K11/26, H04R1/24, priority 01/24/2017), a sound broadcasting device is known, containing a high-frequency section containing at least one source (S _HF ) of high-frequency sound, and a mid-frequency section containing at least two medium-frequency sound sources (S _MF ), the sound sources (S _HF , S _MF ) being superimposed vertically, in which the mid-frequency section contains a lower sub-section located below the high-frequency section and containing at least one medium frequency sound source (S _MF ), and an upper subsection located above the high frequency section and containing at least one medium frequency sound source (S _MF ), in which the directionality in the vertical plane of the high frequency section is tilted relative to the horizontal (H), which is approximately equal to the slope (θ _MF ) directivity in the vertical plane of the midrange section relative to the horizontal, so that about The general directivity in the vertical plane of the device has a non-zero slope (θ _Dir ) relative to the horizontal (Н).

Patent RU2638081 "ACOUSTIC SYSTEM WITH IMPROVED ADJUSTABLE DIRECTION" (MPK H04R1/32, priority 10/30/2013) discloses an acoustic system that contains a high-frequency acoustic transducer and a mid-frequency acoustic transducer, adjustable shutters acting on the sound radiation of a high-frequency acoustic transducer to obtain directivity sound radiation of a high-frequency acoustic transducer in a selected angular sector, while the mid-frequency acoustic transducer and high-frequency acoustic transducer radiate in a common frequency range, and contains a digital signal processor that acts on the signal intended for the high-frequency acoustic transducer and on the signal intended for the mid-frequency acoustic transducer in such a way that the amplitude as well as the phase change in a common frequency range in order to obtain directivity of sound radiation for a pair, consisting consisting of a high-frequency acoustic transducer and a mid-frequency acoustic transducer in the same selected angular sector as the directivity provided by the adjustable doors.

The prototype of the claimed technical solution is the device described in the patent EP0331566 "Cylindrical acoustic wave guide" (IPC G10K11 / 22; G10K11 / 26; H04R1 / 34, priority 29.02.1988) - an emitter (waveguide) for the output side of the loudspeaker, in front of the diaphragm or before entering the compression chamber, lying on the axis of the transducer under consideration and containing a channel, the cross section of which increases from the inlet to the outlet, a hole, the waveguide of which is characterized in that the outlet mouth is flat and elongated, in that its channel contains a passage (between the inlet mouth and an outlet capable of guiding waves in a general sheet-like shape, and the fact that the shortest paths allowed in the passage(s) are substantially the same in length from the inlet to the outlet mouth of the channel, the device is intended for use in large area sound systems.

The disadvantage of the prototype and the known analogues of devices for combining two or more compression drivers into a single sound field with desired characteristics is that they do not allow high sound pressure levels to be reached.

Thus, the technical problem of the proposed technical solution is to create a device that will allow you to combine two or more compression drivers into a single emitter in order to obtain a homogeneous sound field of the maximum pressure level with the ability to control the following characteristics:

- the upper limit of the reproducible frequency range;

- the lower limit of the reproducible frequency range;

- horizontal radiation pattern;

- vertical radiation pattern;

- compactness (dimensions) of the emitter;

- the possibility of attaching additional similar emitters to increase the system.

Disclosure of the essence of the invention

The technical result of the invention is the elimination or reduction of at least one of the disadvantages of known devices, or at least the creation of a device alternative to known devices, which makes it possible to combine the sound fields emitted by two or more compression drivers and effectively combine these fields into a single uniform field in order to achieve high levels sound pressure, and provides the ability to control the system parameters:

- the upper limit of the reproducible frequency range;

- the lower limit of the reproducible frequency range;

- horizontal radiation pattern;

- vertical radiation pattern;

- compactness (dimensions) of the emitter;

- the possibility of attaching additional similar emitters to increase the system.

The technical result of the proposed technical solution is achieved due to the technical design of the device, which is a combined sound emitter containing a system of waveguides (2), the cross-sectional area of which evenly increases from the throat (3) to the mouth (4) of the waveguide (2), forming a horn, design (9) waveguides (2) is such that the time of arrival of a sound wave from compression drivers (1) is the same for all rectangular holes (5) in the mouths of the waveguides (2), a compression driver (1) is attached to the throat (3) of each waveguide (2), the mouth (4) of each waveguide (2) is formed by one or two adjacent holes (5) of a rectangular shape, the distance between which does not exceed half the wavelength of the upper reproducible frequency, while at the cut of each rectangular hole (5) a cylindrical or toroidal wave front is formed ( 6).

A variant of the combined sound emitter is a waveguide system (10), which is used in conjunction with other similar waveguide systems (11). The combined sound emitter may additionally contain a horn (8), the throat of which is connected to the combined mouths of the waveguides, which are rectangular holes (5).

Another version of the combined sound emitter is a device in which the rectangular holes (5) are offset relative to each other, for example, the rectangular holes (5) are staggered.

The main difference of the proposed technical solution from the prototype is that in the claimed technical solution the fields are added both along the short and long sides of the mouths of the waveguides, in contrast to the prototype and other analogues, where compression drivers are used in conjunction with waveguides, which make it possible to obtain a cylindrical or toroidal wave front, folding them into arrays, by arranging their short sides of the mouths to each other.

Brief description of the drawings

The essence of the invention is illustrated by the following drawings.

On FIG. 1 shows a device that combines two compression drivers into one radiator using an additional horn, while the wave fronts are shown for the upper frequency reproduced by the radiator.

On FIG. 2 shows a device that combines six compression drivers into one emitter using an additional horn.

On FIG. 3 shows a device that combines twenty-four compression drivers into one emitter using an additional horn.

On FIG. 4 shows how in analogues, due to the use of compression drivers in conjunction with waveguides, a cylindrical or toroidal wave front is obtained by folding them into arrays by arranging their short sides of the mouths to each other.

The numbers in the drawings indicate:

1 - compression driver

2 - waveguide

3 - throat

4 - mouth

5 - hole

6 - wave front

7 - distance between the centers of adjacent holes

8 - additional horn

9 - design of waveguides

10 – system of waveguides I

11 – system of waveguides II

Implementation of the invention

The device is a combination of compression drivers (1) through a system of waveguides (2). Each waveguide (2) of the system has a throat (3) and a mouth (4). From the throat to the mouth, the cross-sectional area of each waveguide is constantly increasing, being a mouthpiece. A driver is attached to the throat of each waveguide. The mouth of each waveguide is one or two adjacent rectangular holes (5). Depending on the required vertical radiation pattern of the radiator, the design of each waveguide ensures the formation of a cylindrical or toroidal wave front on the cut of each rectangular hole (6). The addition of two or more cylindrical wave fronts occurs if the distance (7) between the centers of neighboring rectangular holes does not exceed half the wavelength of the upper frequency reproduced by the emitter, and the design (9) of the waveguides is such that the time of arrival of the sound wave from the drivers is the same for all rectangular holes in the mouths of the waveguides. The waveguide system (10) can be used in conjunction with other similar waveguide systems (11), as well as with an additional horn (8), the throat of which is connected to the combined mouths of the waveguides (rectangular holes).

By the same principle, compression drivers that reproduce different frequency ranges can be combined into a single system. Rectangular holes can be offset relative to each other, for example, in a checkerboard pattern.

An example of combining two compression drivers into one radiator using an additional horn is shown in Fig. 1. Wave fronts in FIG. 1 are shown for the upper frequency reproduced by the emitter.

An example of combining six compression drivers into one radiator using an additional horn is shown in Fig. 2. In the design (9) of the waveguides, there are additional bends of the channels to compensate for the difference in the time of arrival of the sound wave from the drivers to the rectangular holes in the mouths of the waveguides.

A variant of combining twenty-four compression drivers into one radiator using an additional horn is shown in Fig. 3.

Thus, a technical solution is claimed, which is a device of a combined emitter intended for use in acoustic systems, which makes it possible to achieve a uniform sound field of the maximum pressure level with the possibility of controlling its parameters.

Claims (2)

1. Combined sound emitter containing a system of waveguides (2), the cross-sectional area of which increases uniformly from the throat (3) to the mouth (4) of the waveguide (2), forming a horn, the design (9) of the waveguides (2) is such that the time of arrival of the sound waves from compression drivers (1) are the same for all rectangular holes (5) in the mouths of the waveguides (2), a compression driver (1) is attached to the throat (3) of each waveguide (2), the mouth (4) of each waveguide (2) is formed by two adjacent holes (5) of rectangular shape, the distance between which does not exceed half the wavelength of the upper reproducible frequency, while at the cut of each rectangular hole (5) a cylindrical or toroidal wave front (6) is formed. 2. Combined sound emitter according to claim 1, characterized in that the rectangular holes (5) are offset relative to each other, in particular in a checkerboard pattern.

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