RU2493616C1 - Acoustic horn system - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: acoustic horn system consists of at least two groups of high-, medium- and low-frequency speakers. The low-frequency speakers are placed in the central section of the housing such that a low-frequency acoustic signal comes out through the front wall of the housing. Each of the groups of high- and middle-frequency speakers is placed in the right-side and left-side sections of the housing, respectively. All speakers have their own horns. Low-frequency and high-frequency acoustic signals are combined on static reflecting panels and, after reflection therefrom, come out through the top cover of the housing.

EFFECT: broader functional capabilities of the acoustic horn system and high quality and power of reproducing sound.

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Description

The invention relates to the field of electroacoustics, namely, to mobile (transported) sound reproducing devices that can be used for scoring, mainly car interiors, as well as rooms and open areas.

The car speaker industry has a long history and has many manufacturing companies, such as Alpine, JBL, Kenwood, Pioneer, etc. All of them are united by the traditional approach to solving the problem. For high-quality sounding of the car interior, high-frequency radiators on the dashboard, broadband speakers in the doors and a subwoofer in the trunk are used. Designs and capacities can be different, but the principle of operation is the same - direct radiation from the surface of the speaker into the interior of the car [Electronic resource "Car Audio". The access mode to the resource http://sale.tomsk.ru/avtoakustika-osnovy-vybora./page/20 - free, accessed 11.29.2011; Electronic resource “Selection and installation of car audio. Publisher: Avtsound, 2009. " Access mode for the resource http://tormaza.net/load/samouchiteli/vybor_i_ustanovka_avtoakustiki_skachat_b esplatno_i_bez_registracii / 25-1-0-342 - free].

All well-known car speakers do not allow to achieve high quality and sound power in the passenger compartment.

The use of acoustic horn systems can significantly improve sound quality, create a "presence effect" of the listener at a concert or in the studio. This is because the horn not only increases the distance over which the sound wave propagates, but also increases its density and gives it a characteristic sound.

Various technical solutions are known for acoustic horn systems. Thus, for example, an acoustic horn system is known, comprising at least one loudspeaker mounted on the front wall of the housing, the inner volume of which forms a main waveguide having an outlet in the outer space, at least one additional waveguide mounted on the rear side loudspeaker, characterized in that the additional waveguide is made in the form of a Laval nozzle, inside which reflective lenses are placed (patent RU No. 2237981, IPC H04R 1/28, H04R 1/02, publ. 10.10.2004).

Also known acoustic horn system (patent RU No. 101884, IPC H04R 1/34, publ. 01/27/2011) containing a low-frequency speaker placed in the housing, mid-frequency and high-frequency speakers, each placed in its corresponding housing and equipped with a speaker.

The invention is also known (patent RU No. 2201044, IPC H05K 5/00, H04R 1/02, H04R 1/28, publ. March 20, 2003), which is an acoustic horn system containing a loudspeaker and an acoustic horn in the form of a symmetrical volumetric, continuously expanding and having, for example, the shape of a truncated pyramid through which passes the acoustic signal of the speaker. In this case, a loudspeaker is installed in the smaller hole of the horn, and the opening of the horn is docked to the outside of the housing. As a result, the amplitude-frequency characteristic in terms of sound pressure is improved, surround sound is given, the design is simplified, the dimensions and weight of the speaker system are reduced.

All of the above speaker horn systems are stationary, take up a lot of space, are not intended for transportation and installation in the car, and also do not allow to achieve high-quality sound reproduction in the entire range of reproduced frequencies.

The closest set of essential features to the proposed system is an acoustic horn system (US patent No. 6118883, IPC H04R 25/00, publ. 09/12/2000), which is selected as a prototype. The system described in this patent includes two low-frequency speakers, two mid-frequency speakers, and six high-frequency speakers. The known system has a horn with a narrow input radiation pattern and a wide output pattern. Tweeters are built in at the beginning of the speaker, and work on its entire length. Mid-range speakers are installed on the inner surfaces of the horn in places of its maximum expansion, and direct the middle frequency through special holes on its surface into the horn. A complex acoustic signal exits the common speaker. The woofers are located on the sides of the speaker horn system and operate perpendicular to the medium and high frequency sound waves.

The disadvantages of the prototype are:

- insufficient low-frequency power, since the low-frequency speakers do not have their own horn, they are located on the sides of the speaker, they do not work on a common front with high-frequency and mid-frequency emitters;

- incomplete sound of medium frequencies, the sound passes through the holes in the walls of the horn of high frequencies and does not correspond due to its location the acoustic wave loaded on the horn;

- insufficient peak power;

- 220 W power is required, an additional power source is required in the car;

- you need to install two mono speakers to get a stereo effect;

- The system is not intended for use in the vehicle interior.

The aim of the invention is the creation of a portable acoustic horn system, which could be used both for sounding the interior of the car, and other rooms and open areas, while providing high-quality sound, sufficient sound power and stereo effect.

The technical result consists in expanding the functionality of the acoustic horn system and improving the quality and power of sound reproduction.

This goal is achieved due to the fact that the acoustic horn system, which includes speakers of low, medium and high frequencies, placed in a single housing, it is proposed to perform as follows:

- the case is divided into three sections isolated by partitions;

- equip each speaker with its own speaker;

- enter into the system at least two groups of mid and high frequency speakers and two static reflective panels located in the right and left sections of the housing, respectively, with the axis of symmetry of both speakers of each group being placed on the same vertical plane, but at different heights from the bottom of the case, while the distance from the speakers to the static reflective panel and the angle of its inclination should be chosen so that the acoustic signals of medium and high frequencies are added to the static reflective panel and, reflected from her, went out through the holes in the top cover of the case;

- enter into the system at least two low-frequency speakers located in the central section of the housing, so that the acoustic signal of the low frequency exits through the front wall of the housing.

Additional features of the proposed system are:

- the angle between the axis of symmetry of the high-frequency speaker and the static reflecting panel is 66 ° 52 ';

- the angle between the axis of symmetry of the mid-range speaker and the static reflective panel is 57 ° 41 ';

- has a reflective panel for directing the sound wave in the opposite direction from the main direction;

- has triangular-shaped slots in the side walls of the body;

- has a built-in router that provides wireless control from any iPhone, iPod, iPad.

The invention is illustrated by the following figures:

figure 1 (a-g) shows the design of an acoustic horn system, where:

1 - high-frequency (tweeter) speaker;

2 - mid-frequency (MF) speaker;

3 - low-frequency (woofer) speaker;

4 - horn part of the acoustic horn system;

5 - a set of equipment receiving a signal from a sound source and amplifying it;

6 - fixed acoustic reflector;

7 - section midrange, treble;

8 - bass section;

9 - static reflective panel.

On figa - top view.

On figb - front view.

On figv is a view in section along A.

In Fig.1d is a view in section along B.

Figure 2 shows a static reflective acoustic panel for synchronous reflection of the MF / HF with a change in direction to the passenger compartment.

Figure 3 shows a removable reflective acoustic panel for synchronous reflection of the midrange / treble with a change of direction from the passenger compartment,

where 10 is a removable reflective acoustic panel.

The principle of operation of the proposed acoustic horn system is as follows. The movement of sound waves is similar to the movement of light rays. In accordance with the laws of geometric optics, when reflected from mirror surfaces, the angle of reflection is equal to the angle of incidence. Sound waves from the mid-range speaker 2 and the tweeter 1 fall on the static reflecting panel 9 and change direction, either rushing into the car or, when installing the removable reflecting panels 10, onto the street in the opposite direction. The woofer 3 with its horn always works towards the trunk lid (not shown in the drawing).

The music signal is received wirelessly via WI-FI at a distance of up to 100 meters from any i - device (iPhone, iPod, iPad, computer with iTunes installed) and is transmitted from the router built into the system with support for streaming analog signal to amplifiers. If necessary, the signal can be sent using wires.

In one example of an acoustic horn system, the acoustic horn system has dimensions of 1060/765/300 mm (width / length / height) and a weight of 70 kilograms, it houses two class AB power amplifiers, two ten-inch speakers in a hybrid-horn compartment for low-frequency reproduction, two five-inch speakers loaded on a speaker for reproducing medium frequencies and two inch tweeters on the horns with a wide radiation pattern. Also, an Apple AirPort module is built into the speaker horn system, which works as a router with support for streaming analog signal via WI-FI to amplifiers at a distance of up to 100 meters. If necessary, the signal can be sent using wires. The power of the acoustic horn system is 1300 watts, which allows you to easily connect to the regular 12-volt network of the car without an additional increase in the power of its generator. At the same time, the average sound pressure in the driver's seat is 128 db, which feels like 5 kW of ordinary sound, only more detailed and assembled.

Additionally, the speaker horn system is equipped with a wireless radio button, for turning it on and off at a distance of up to 250 meters.

Thus, the proposed acoustic horn system has the following advantages over known devices:

1. has a true horn sound in the entire frequency range (A horn sound feature is a high distinctiveness and sound pressure level of the reproduced material. The average sound pressure level in the driver's seat is 128 dB, while the power of the proposed acoustic horn system is only 1300 W, such parameters are unattainable when other design solutions in the range from 25 Hz to 20 kHz, with unevenness of not more than 3 dB);

2. works on two sides (the acoustic horn system is designed in such a way that a high-quality sound is obtained not only inside the car, but also outward when opening the trunk lid);

3. does not require interior alteration when installing an acoustic horn system;

4. does not require an increase in the power of the electric network of the car;

5. does not require reworking the car’s full-time speaker system, which can be used by the car owner at any time;

6. control is carried out from any i - device via WI-FI wireless network (iPhone, iPod, iPad, from any computer with iTunes installed, at a distance of up to 100 meters);

7. It is quickly installed (the necessary time for installing the speaker horn system in the car, which includes pulling the power wires from the battery into the luggage compartment, is about two hours);

8. can operate from the battery in any place where there is a need for loud and high-quality sound (on a fully charged battery 55 ampere / hour, you can work at least 4 hours, depending on the volume level);

9. It is easily rearranged in a new automobile vehicle.

Claims (6)

1. An acoustic horn system, including low, medium and high frequencies, placed in a single enclosure, characterized in that the enclosure is divided into three insulated partition walls, each speaker is equipped with its own speaker, the system has at least two groups of mid speakers and high frequencies and two static reflective panels located in the right and left sections of the housing, respectively, and the axis of symmetry of both speakers of each group are located on the same vertical plane, but at different heights from the bottom case, while the distance from the speakers to the static reflective panel and the angle of its inclination are selected so that the acoustic signals of medium and high frequencies are added to the static reflective panel and, reflected from it, go out through the openings in the upper case cover, at least two low-frequency speakers are located in the center section of the cabinet so that the low-frequency acoustic signal exits through the front wall of the cabinet. 2. The acoustic horn system according to claim 1, characterized in that the angle between the axis of symmetry of the high-frequency speaker and the static reflective panel is 66 ° 52 '. 3. The acoustic horn system according to claim 1, characterized in that the angle between the axis of symmetry of the mid-range speaker and the static reflective panel is 57 ° 41 '. 4. The acoustic horn system according to claim 2, characterized in that it has a reflective panel for directing the sound wave in the opposite direction from the main direction. 5. The acoustic horn system according to claim 3, characterized in that it has triangular-shaped slots in the side walls of the housing. 6. The acoustic horn system according to claim 4, characterized in that it has a built-in router that provides wireless control from any iPhone, iPod, iPad.

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