RU1771083C - Stereophonic sound reproduction device - Google Patents

Abstract

Application. The invention relates to electroacoustics and may find application in high-quality stereo sound systems. The essence of the invention is that two electro-acoustic transducers are installed in the same acoustic design and are deployed in different directions from each other, and the acoustic axes of both transducers make an angle of 2-45 ° with the axis of the base. 2 ill.

Description

The invention relates to the field of radio engineering, in particular to electroacoustics, and can be used for broadcasting and reproducing stereo sound recordings.

Known acoustic emitters containing broadband and high-frequency speakers,

The emitter consists of two independent loudspeaker systems located in a common acoustic volume. The loudspeakers of one of the systems are located frontally, the others are placed in the horn-horn.

The prototype is an installation method and a device for stereo playback, containing one or more pairs of emitters, reproducing units, spaced along the base.

The acoustic axes of the mid-frequency emitter are directed (converging with beams)

at an angle of 35-60 ° to the line perpendicular to the base (in t. AI, etc.).

The installation method of this device consists in placing emitters against each other (mainly with a base) (0.8-2: 4 m), usually in service rooms such as halls of clubs, palaces, etc. In this case, the distance of the stereo base to the reflector is not taken into account.

The known method and device have the following disadvantages: insufficient compactness and large size of the exploited (service) areas, caused by the need to increase the number of emitters to achieve the desired effect; insufficient stereo radiation efficiency; rather high cost of devices, due to the need to increase the number of emitters, the presence of lenses, etc.

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The aim of the invention is to remedy these drawbacks and increase stereo effects.

This goal is achieved in that the cost is reduced by increasing compactness and reducing installation areas, the acoustic axes of the emitters form an angle of 2 and 4-90 °. The device is equipped with a position lock. The position lock (speaker) is made in the form of a shaped gasket, the profile of which is made with a slope forming an installation plane. The position lock is made in the housing of the reproducing unit in the form of mounting pads (under the speaker), deployed at an angle to the frontal plane. The device is placed at a distance H from the reflector, defined by the ratio

u (Bi-B) ctga0

In FIG. 1 shows a General view of the device; in FIG. 2 - fragment of the device.

The device of the acoustic stereo emitter of the reproducing aggregate 1 contains emitters (speakers) 2 and 3, placed in the same plane in the housing 4. including side walls 5 and 6, the front surface 7, the stereo base line, the reflector 8 and the acoustic axis YI- YI and Y2-Y2. In room 9 there can be objects (furniture) 10-12. The listener (person) 13 is also (in the cavity) in room 9. In at least one

a pair of emitters installed with a turn

from acoustic axes (Yi-Yi and Y2-Y2) under

angle a ° to the base line towards the side walls of the reproducing unit (out), i.e. flow rate in different directions by axes. The acoustic axis of the front emitters form an angle of 2 "4-90 °. The device is provided with a position lock 14 of the emitter (speaker). The position lock 14 can be made in the form of protrusions and recesses in the housing 4, forming a slope (see Fig. 2), or in the form of a separate shaped gasket (flange with an end slope), the profile of which is made with a slope forming an installation plane under the emitter 2 or 3 (for speakers).

The position lock can be made in the form of installation pads, deployed at an angle / oo, determined from

ratio / e0 180 ° -2 a °.

A method of installing an acoustic stereo device includes placing it in a room cavity.

Determine the distance

0 5

0

fifty

5

"5 Q

e

(Bi-B) ctga0

where B is the distance between the acoustic axes of the emitters (from technical documentation - a stereo base or size);

W is the distance between the intersection points of the acoustic axes with the reflector (from the specific dimensions of the room where the device will be installed);

2a - angle of rotation of acoustic axes (determined from technical documentation or size).

Place the device at a distance H from the reflector.

An example of implementation. Accepted stereo stereo emitters with the following characteristics;

stereo base 2.4 m angle 2 it 4 ° angle 2 ai 90 ° angle 2 az 46 ° angle 2 ° 3 ° angle 2 05 15 °

They were installed in the room (room) with an area of 13, 18 and 25 m2 with the corresponding reflector width: 2.5, 3 and 5.5 m.

The distance Bi, respectively, is: 2; 2.8 and 5m.

Define the distance H: -l V m:, 6, 28N2 0.86

, 03, 9, 53

-l, 8 m:, 28, 3, 6

- For In m:, 5, 28, 4, 9.

Acoustic stereo speakers were alternately moved to all three rooms (rooms). Tested. As a result of the tests, the following was established. At angles of 2 and 4 °, the stereo effect is attenuated. At angles 2, a sharp decrease in frontal sound pressure is observed. The optimum value of H is the angle of rotation of the acoustic axes of the order of 4-90 °.

The device operates as follows.

The sound frequency signal is transmitted to the emitters (dynamic heads) and is converted into sound waves that propagate on the axis of the emitter. Reflecting from obstacles (room walls, furniture, stands, etc.), a reflected wave is generated, which is added to the front (in the listening area).

The use of the present invention allowed to reduce the cost (compared with the prototype), increase its compactness as a whole and increase the stereophonic effect of the unit, since the reflected wave has a greater stereo base compared to the direct wave. These features of the invention make it possible to use small-sized apartments with a sufficiently high level of stereo sound, as well as

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5

Claims (1)

a stereo radio device having one acoustic unit allows to achieve a good stereo effect. SUMMARY OF THE INVENTION A stereo sound reproducing apparatus comprising two electro-acoustic transducers placed in an acoustic design and spaced apart from one another in a base, characterized in that, in order to simplify the design and improve the stereo effect, both electro-acoustic transducers are placed in the same acoustic design at an equal distance from center and are turned in different directions from each other, and the acoustic axes of both transducers make an angle of 2-45 ° with the axis of the base. Shchig. 1 FIG. 2