CN111294698A - A small sound column type full-range speaker for classrooms - Google Patents

Abstract

The invention relates to a small sound column type full-frequency speaker for classrooms, which belongs to the field of electro-acoustic equipment and can be used in standard classroom sound reinforcement systems, multimedia teaching systems and the like. The purpose of the invention is to propose a small sound column type full-range speaker for classrooms, which improves its frequency response characteristics and directivity characteristics through the combination of tweeters of different specifications and full-frequency high-pitched units. The high-frequency and high-frequency unit is installed in the center of the panel, and the two tweeters are installed above and below the panel to form a sound column. .

Description

A small sound column type full-range speaker for classrooms

technical field

The invention relates to a small acoustic column type full-frequency speaker for classrooms, which belongs to the field of electro-acoustic equipment and can be used in standard classroom sound reinforcement systems, classroom broadcasting systems or multimedia teaching systems in middle and primary schools, and can also be used in middle and large classrooms or Other usage environments or occasions.

Background technique

Classroom sound reinforcement system, classroom broadcasting system or multimedia teaching system all need small speakers, but there is a lack of such small speakers for classrooms in the market. Since the transmission is mainly high-pitched (human voice), small full-range speakers are generally used. or small column speakers.

The prior art of such a small full-range speaker is that its structure is generally an ordinary small two-unit (speaker) speaker, including a tweeter unit with a unit diameter of 1.5 or 2.5 inches, and a mid-high frequency unit with a unit diameter of 4 inches or 5 inches. inch, and the adapted frequency division circuit (frequency divider). The advantage of this type of speaker is that the frequency response is better, and the high-pitched (human voice) is clearer; the disadvantage is that its directional characteristics are poor, so the sound intensity in the classroom is not uniform and will produce strong in a small space such as the classroom. The reverberation makes the sound (human voice) muddy.

There are also small sound column-type speakers. The prior art is that the structure is basically three-unit or five-unit, and the specifications of each unit are the same, and the diameter is generally 3 inches. The characteristic of this kind of speaker is that it has good directivity (directivity) in space. ), the required directional characteristics are formed due to the interference of sound waves when it is installed and used in the classroom. The sound intensity is gradually attenuated (the side lobes in the directional diagram are lower), so the advantage of this type of speaker is that the sound intensity in the classroom can be uniform and reduced by using its directional characteristics to transmit the sound to a far rear position. Small reverberation, and thus can make the sound of each position in the classroom clearer and the acoustic effect (such as presence, etc.) better; but the shortcomings are also obvious. Because there is no tweeter, the frequency response characteristics of the high and middle frequencies are poor, which makes the high The voice (human voice) is muddy and unclear.

There are other similar loudspeaker systems in the prior art, such as larger so-called full-range sound columns. It has a large number of units and a large unit diameter. The key is that it generally adopts a so-called full-frequency unit with a coaxial structure of a mid-range loudspeaker (this unit is mostly used in car audio systems due to its compact structure), so it has better frequency response characteristics and directivity. characteristic. Due to its good reproducibility (reproducibility or high fidelity (HiFi) performance), it is mostly used in high-end application environments such as concert halls, theaters, and conference halls. However, due to the high cost and large size, it is not suitable for general classroom use.

The reason why the above-mentioned existing technologies have these defects is mainly due to the prejudice in the design and understanding of classroom speakers, ignoring the importance of the frequency response characteristics and directional characteristics of the high-midrange (human voice) frequency band, especially the ability to display sound details (human voice). The frequency response characteristics and directivity characteristics of the high frequency band of the sound clarity) are not good.

SUMMARY OF THE INVENTION

The purpose of the present invention is to propose a small acoustic column type full-range speaker for classrooms, which can improve its frequency response characteristics and directivity characteristics through the combination of tweeters of different specifications and full-frequency high-frequency units, especially to improve its high-frequency frequency Acoustic characteristics and directivity characteristics, in order to improve the restoration of the high-pitched (human voice) frequency band in a classroom environment.

The present invention is realized by the following technical scheme: the present invention consists of a panel, a full-frequency high-midrange unit, a tweeter unit, a side panel, a back panel and a frequency divider (circuit), and is characterized in that the panel, the side panel and the back panel To form a speaker box, 1 full-range mid-range unit and 2 tweeters are installed on the panel, of which the full-range mid-range unit is installed in the center of the panel, 2 tweeters are installed above and below the panel, and the side panels are curved , the back panel is slanted so that the panel of the speaker is slanted down when the speaker is mounted on the wall.

The full-frequency high-frequency unit adopts the full-frequency unit with the coaxial structure of the high-frequency loudspeaker.

The tweeter adopts a dome tweeter.

The full-range mid-range unit (the tweeter) and 2 tweeters form a sound column in the vertical direction.

The panels and side panels are made in one piece using a plastic injection molding process.

The principle of the present invention is:

The present invention is installed above both sides of the classroom blackboard and is installed by the method of hanging on the wall. The panel, side panel and back panel constitute the speaker box, 1 full-range mid-range unit and 2 tweeter units are installed on the panel, of which the full-range mid-range unit is installed in the center of the panel, and 2 tweeters are installed above the panel. Therefore, the speaker box constitutes a sound barrier so that the present invention has the structure and function of a speaker; the side plate is a curved surface and has better rigidity than ordinary flat plates, which can reduce vibration and improve the sound barrier effect; the back plate is inclined When the speaker is installed on the wall, the panel is inclined downward, so that the main lobe in the directional diagram faces the students in the back row to make the sound intensity in the classroom uniform and avoid facing the back wall of the classroom to reduce reverberation; full-frequency high school The mid-range unit in the sound unit can improve the sound power of the mid-frequency sound, and the tweeter and two tweeters in the full-frequency high-frequency unit can improve the sound power of the high-frequency sound, so as to ensure and improve the high-frequency sound characteristics of the speaker of the present invention. and vocal restoration; the tweeter and 2 tweeters in the full-frequency high-pitched unit form a sound column, so as to ensure and improve the directional characteristics of the speaker of the present invention; Therefore, the use of only one full-frequency high-midrange unit has little effect on the directivity characteristics of the speaker of the present invention; the frequency divider (frequency division circuit) plays the role of frequency division; the curved side plate is more suitable for the injection molding process. The molding process is more suitable for directly making the front panel and the side panel into one piece.

The beneficial effects that the present invention can produce are: 1. Improve the frequency response characteristics and directional characteristics of classroom speakers, and improve the clarity and acoustic effect (especially the sense of presence) of the high-pitched (human voice) frequency band in the classroom environment; 2. . The box body is manufactured by injection molding process, which is simple in process, low in cost and good in quality; 3. It is easy to install (no need for additional mounting brackets), and can avoid the negative effects caused by improper adjustment of the installation direction (angle).

Description of drawings

FIG. 1 is a schematic view of the structure of the present invention (viewed from the front panel), and FIG. 2 is a right side view of FIG. 1 .

The names of the labels in the accompanying drawings are: 1, panel, 2, full-frequency high-pitched unit, 3, tweeter unit, 4, side panel, 5, back panel.

Detailed ways

The specific embodiments and embodiments of the present invention will be described below with reference to the accompanying drawings.

As can be seen from the attached drawings, the panel (1), the side panel (4) and the back panel (5) constitute a speaker box, and one full-frequency midrange unit (2) and two tweeters (3) are installed on the panel (1) The high-frequency unit (2) is installed in the center of the panel (1), the two tweeters (3) are installed above and below the panel (1), and the side panels (4) are curved (can be two The directions are all curved surfaces, and only one curved surface is drawn in the drawing for simplicity), and the back plate (5) is inclined so that the front panel (1) is inclined downward when installed on the wall.

The present invention adopts the commonly used electro-acoustic unit, the full-frequency high-pitched unit (2) adopts the full-frequency unit with the coaxial structure of the high-pitched loudspeaker, and the tweeter unit (3) adopts the dome tweeter unit. It can be seen from the accompanying drawings that the full-frequency high-frequency unit (2) (the tweeter) and the two tweeters form a sound column in the vertical direction.

Figures 1 and 2 also illustrate one embodiment of the tool of the present invention.

In this embodiment, the curved surface of the side panel is elliptical, the panel is inclined downward by about 7 degrees, the full-frequency high-frequency unit (2) adopts a 3-inch high-mid frequency coaxial structure, and the two tweeters (3) use a 1.5-inch high-frequency unit. Dome tweeter, the spacing between the 3 units is 65mm, and an adapted first-order filter circuit is designed and used in the 4-way unit (speaker) (or only in the full-frequency high-frequency unit (2)). An adapted low-pass filter is used in the midrange unit (speaker). In this embodiment, a sound-transmitting shield for protection is added in front of the panel. When assembling, a gasket (vibration damping pad) is added between each unit and the panel; in addition, the wiring of each unit should be correct to ensure that the sound phase is consistent.

This embodiment is installed in standard classrooms of primary and secondary schools, and the restoration and acoustic effect of the high-pitched (human voice) frequency band are improved, especially the sense of presence and the sound intensity and sound clarity of the rear row are significantly improved.

This embodiment verifies the practicability and beneficial effects of the present invention, and achieves the purpose of the invention and design.

Claims (5)

1. A small-sized sound column type full-frequency speaker for classrooms is composed of a panel, a full-frequency midrange unit, a tweeter, a side panel, a back panel and a frequency divider (circuit), and is characterized in that the panel, the side panel and the The back panel constitutes the speaker box, 1 full-range mid-range unit and 2 tweeters are installed on the panel, of which the full-range mid-range unit is installed in the center of the panel, and 2 tweeters are installed above and below the panel. Curved, the back panel is slanted so that the panel is sloping down when the speaker is wall mounted. 2 . The small sound column type full-frequency speaker for classrooms according to claim 1 , wherein the full-frequency high-frequency unit adopts a full-frequency unit with a coaxial structure of the high-frequency loudspeaker. 3 . 3 . The small acoustic column type full-frequency speaker for classrooms according to claim 1 , wherein the tweeter adopts a dome tweeter. 4 . 4. the small-sized sound column type full-frequency loudspeaker that a kind of classroom uses according to claim 1,2 or 3, it is characterized in that, full-frequency high-pitched unit (the tweeter) and 2 tweeters are formed in the vertical direction sound column. 5 . The small acoustic column type full-frequency speaker for classrooms according to claim 1 , wherein the front panel and the side panel are integrally manufactured by plastic injection molding process. 6 .

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