CN115150709A

CN115150709A - Linear band-pass full-band sound box with function of offsetting redundant bass at rear

Info

Publication number: CN115150709A
Application number: CN202210794244.6A
Authority: CN
Inventors: 吴振强
Original assignee: Shandong Zuimeisheng Audio Co ltd
Current assignee: Shandong Zuimeisheng Audio Co ltd
Priority date: 2022-07-07
Filing date: 2022-07-07
Publication date: 2022-10-04

Abstract

The invention relates to a linear band-pass full-band sound box capable of offsetting rear redundant bass, which comprises a box shell, wherein the opposite corners of the rear side of the box shell are inwards bent, a high-pitch horn component is arranged on the inner side close to the front side plate of the box shell, front woofers are arranged on two sides of the high-pitch horn component, band-pass sound boxes which are symmetrically arranged are arranged at the opposite corners close to the rear side of the box shell, each band-pass sound box comprises a baffle which is parallel to the side wall of the box shell and extends backwards and a positioning plate arranged at the rear part of the box shell, mounting plates which are parallel to the baffle are arranged on the opposite inner sides of the baffle, rear woofers are arranged on the inner sides of the mounting plates, sound raising cavities are formed by the inner sides of the mounting plates, the inner sides of the positioning plates and the outer sides of the rear part of the box shell, and phase guide holes in opposite directions are formed in the two sound raising cavities. This have and offset the unnecessary bass's in rear linear band-pass full frequency channel audio amplifier realizes offsetting a plurality of sound shells of the unnecessary bass in audio amplifier rear, can be higher as the efficiency of acting on bass reflex housing, and the size of horn structure is littleer, applicable in the place that needs high sound pressure level.

Description

Linear band-pass full-band sound box with function of offsetting rear redundant bass

Technical Field

The invention relates to a linear band-pass full-band sound box with a function of offsetting rear redundant bass.

Background

A speaker refers to a device that can convert an audio signal into sound. Generally speaking, it is that a power amplifier is provided in the main cabinet or the bass cabinet of the sound box, and the sound is amplified and then emitted back by the sound box itself, so that the sound becomes louder. The loudspeaker box is a terminal of the whole sound system and is used for converting audio electric energy into corresponding sound energy and radiating the sound energy into a space. It is an extremely important component of an audio system and is responsible for the task of converting electrical signals into acoustic signals for direct listening by the human ear. The sound box is provided with a box body, which is mainly used for preventing sound wave signals on the front surface and the back surface of a loudspeaker diaphragm from directly forming a loop, so that only high-frequency and medium-frequency sound with small wavelength can be transmitted, and other sound signals are superposed and cancelled. The physical model of the sound box is that a hole is arranged on an infinite rigid baffle plate, and a loudspeaker is installed, so that sound signals on the front side and the back side of the loudspeaker can not form a loop to cause a sound wave loop. However, in practice, the sound box cannot be made infinitely large, so that a closed space is formed behind the loudspeaker by using the baffle plate, and the front transmission of sound waves is ensured. The problems that follow: because the problem of atmospheric pressure after the audio amplifier is airtight, the box of audio amplifier is that big more is favorable to the low frequency sound to restore, and the volume of general audio amplifier is the data of compromising according to the speaker size calculation of well bass unit, and many environment still do not allow too big box simultaneously, and the sound production department of audio amplifier inevitably can appear the frequency response and interfere, and the unnecessary bass that can appear of rear especially causes the interference, and consequently, it is very necessary to design a linear band-pass full frequency range audio amplifier with the unnecessary bass of offsetting the rear.

Disclosure of Invention

The invention aims to provide a linear band-pass full-band sound box with a function of offsetting rear redundant bass, which can offset a plurality of sound shells of the redundant bass behind the sound box, has higher efficiency when acting on a bass reflection shell, has smaller size as a horn structure, and is suitable for places requiring high sound pressure level.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a full frequency channel audio amplifier of linear band-pass with offset unnecessary bass in rear, its structural feature is including the case shell of rear side diagonal angle inwards buckling, is close to be equipped with high pitch horn subassembly on the inboard of curb plate before the case shell, the both sides of high pitch horn subassembly are equipped with the place ahead woofer, are close to case shell rear side diagonal angle department is equipped with the band-pass audio amplifier that the symmetry set up, the band-pass audio amplifier include with case shell lateral wall parallel and level and backward extend the locating plate at case shell rear portion, the relative inboard of baffle be equipped with baffle parallel arrangement's mounting panel, the inboard of mounting panel is equipped with rear woofer, the mounting panel is inboard the locating plate inboard with the case shell rear portion outside constitutes raises the sound chamber, two raise the leading looks hole of seting up the opposite direction on the sound chamber.

The beneficial effects of the invention are:

when the invention is used, the sound pressure level of the band-pass mode is obviously improved in the range of 50Hz-70Hz, and the comparison with the reverse mode shows that the band-pass mode is increased by about 1.5dB in the frequency range. In the frequency band 125Hz-500Hz range, the comparison with the reverse mode shows that the sound pressure level of the band-pass mode in the frequency band is improved by about 1.5-4 dB. Therefore, the change of the structure causes great change in sound between the band-pass sound box and the non-band-pass sound box. When the front loudspeaker and the rear loudspeaker sound together when the rear part of the sound box is tested, the waveform peak value of a frequency response curve is small when the frequency response curve is 50Hz-250Hz, which shows that the dryness of the audio-visual area at the rear part of the sound box is obviously improved when the front bass loudspeaker occurs compared with the front test. The whole frequency is obviously reduced by 3-6dB at 50Hz-250Hz, the sound production of the front low-frequency loudspeaker is counteracted, and the sound box with a band-pass structure is applied to a stage to counteract the redundant bass of the rear part, so that the sound on the stage is cleaner, and the performance of various musical instruments is easier to hear. The realization offsets a plurality of sound shells of unnecessary bass in audio amplifier rear, and the efficiency that can be higher when the effect is at bass reflex housing, and the size as the bugle structure is littleer, applicable in the place that needs high sound pressure level.

As a modified technical scheme, high pitch horn subassembly includes high pitch horn, set up the high pitch sound outlet that corresponds high pitch horn on the case shell, the upper end of high pitch horn is equipped with loudspeaker.

As an improved technical scheme, a high-pitch cover is covered on the outer portion of the high-pitch horn component, and a middle-pitch horn is arranged on the upper portion of the high-pitch cover.

As an improved technical scheme, the two sides of the high-pitch horn component are symmetrically provided with middle-pitch horns.

As an improved technical scheme, the mounting plate is arranged in an inverted L shape, and the upper part of the mounting plate and the lower part of the positioning plate, and the upper part of the baffle and the lower part of the positioning plate form a phase guide hole.

As an improved technical scheme, the upper part of the mounting plate is fixedly connected with the lower part of the positioning plate, and the positioning plate and the outer part of the rear part of the box shell form a phase guide hole.

Drawings

FIG. 1 is a schematic structural diagram according to a first embodiment;

FIG. 2 is a schematic structural diagram of the second embodiment;

FIG. 3 is a schematic structural view of the third embodiment;

FIG. 4 is a schematic structural view of the fourth embodiment;

FIG. 5 is a schematic diagram showing a comparison of the frequency response curve of the bandpass cover plate with the frequency response curve of the normal inverted structure;

FIG. 6 is a schematic diagram of the phase curves of the speakers after testing only the front speakers at the rear and after testing only the rear bandpass speaker adjustments at the rear;

FIG. 7 is a schematic diagram of the frequency response curves measured when testing only the front horn at the rear and testing the front and rear horns at the rear to sound together;

FIG. 8 is a graph illustrating the mid-low frequency response of an acoustic front side measurement when the rear bandpass speaker unit is not turned on;

fig. 9 is a measurement directly in front of the stereo: when the rear band-pass speaker unit is turned on, the curve diagram of the medium-low frequency response is shown;

illustration of the drawings: 1-box shell, 2-high pitch horn, 3-front woofer, 4-baffle, 5-positioning plate, 6-rear woofer, 7-sound cavity, 8-phase guide hole, 9-tweeter, 10-high cover, 11-middle horn.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Specific examples are given below, and for the sake of understanding, the up-down direction of fig. 1 is taken as the front-rear direction.

Example one

Referring to fig. 1, a linear band-pass full frequency channel audio amplifier with offset unnecessary bass in rear, including the case shell 1 of rear side diagonal inward bending, be close to be equipped with high pitch horn 2 subassembly on the inboard of case shell 1 preceding curb plate, the both sides of high pitch horn 2 subassembly are equipped with the place ahead woofer 3, are close to 1 rear side of case shell diagonal department is equipped with the band-pass audio amplifier that the symmetry set up, the band-pass audio amplifier include with 1 lateral wall parallel and the ranging back baffle 4 of case shell and locate locating plate 5 at 1 rear portion of case shell, the relative inboard of baffle 4 be equipped with 4 parallel arrangement's of baffle mounting panel, the inboard of mounting panel is equipped with rear woofer 6, the mounting panel inboard 5 inboard with 1 rear portion outside of case shell constitutes loudspeaker cavity 7, two set up the phase guide hole 8 of direction in opposite directions on the loudspeaker cavity 7, high pitch horn 2 subassembly includes high pitch horn 2, set up the sound outlet hole that corresponds high pitch horn 2 on the case shell 1, the upper end of high pitch horn 2 is equipped with loudspeaker 9. The outer cover of the high pitch horn 2 component is provided with a high pitch cover 10, and the upper part of the high pitch cover 10 is provided with a middle-pitch horn 11. The mounting plate is arranged in an inverted L shape, and the upper part of the mounting plate and the lower part of the positioning plate 5, and the upper part of the baffle plate 4 and the lower part of the positioning plate 5 form a phase guide hole 8.

Example two

The difference from the first embodiment is that:

referring to fig. 2, the high pitch cover 10 is established to the outside of high pitch subassembly not cover, high pitch horn 2 subassembly includes high pitch horn 2, set up the high pitch sound outlet that corresponds high pitch horn 2 on the case shell 1, the upper end of high pitch horn 2 is equipped with loudspeaker 9. The two sides of the high-pitch horn 2 component are symmetrically provided with a medium-pitch horn 11.

EXAMPLE III

The difference from the first embodiment is that:

referring to fig. 3, the upper portion of the mounting plate is fixedly connected with the lower portion of the positioning plate 5, and the positioning plate 5 and the outside of the rear portion of the cabinet 1 form a phase guide hole 8.

Example four

The difference from the first embodiment is that:

referring to fig. 4, the high pitch cover 10 is not established to the outside of high pitch subassembly, high pitch horn 2 subassembly includes high pitch horn 2, set up the high pitch sound outlet that corresponds high pitch horn 2 on the case shell 1, the upper end of high pitch horn 2 is equipped with loudspeaker 9. The upper portion of mounting panel with the lower part fixed connection of locating plate 5, locating plate 5 with the outside at case shell 1 rear portion constitutes leads looks hole 8.

When the invention is used, the sound pressure level of the band-pass mode is obviously improved in the range of 50Hz-70Hz, and the comparison with the reverse mode shows that the band-pass mode is increased by about 1.5dB in the frequency range. In the frequency band 125Hz-500Hz range, the comparison with the reverse mode shows that the sound pressure level of the band-pass mode in the frequency band is improved by about 1.5-4 dB. Therefore, the change of the structure causes great change in sound between the band-pass sound box and the non-band-pass sound box. When the front loudspeaker and the rear loudspeaker sound together when the rear part of the sound box is tested, the waveform peak value of a frequency response curve is small when the frequency response curve is 50Hz-250Hz, which shows that the dryness test of the audio-visual area at the rear part of the sound box by the front woofer 3 is obviously improved when the front woofer occurs compared with the front woofer. The whole frequency is obviously reduced by 3-6dB at 50Hz-250Hz, the sound production of the front low-frequency loudspeaker is counteracted, and the sound box with a band-pass structure is applied to a stage to counteract the redundant bass of the rear part, so that the sound on the stage is cleaner, and the performance of various musical instruments is easier to hear. The realization offsets a plurality of sound shells of unnecessary bass in audio amplifier rear, and the efficiency that can be higher when the effect is at bass reflex housing, and the size as the bugle structure is littleer, applicable in the place that needs high sound pressure level.

Specifically, referring to fig. 5, the frequency response curve (bandpass mode) after the bandpass cover is added is compared with the frequency response curve (reverse mode) of the normal reverse structure.

The sound pressure level of the band-pass mode is obviously improved in a frequency band 50Hz-70Hz range through the waveform change of the frequency response curve, and the band-pass mode is increased by about 1.5dB in the frequency band through the comparison with the backward mode. In the frequency band 125Hz-500Hz range, the comparison with the reverse mode shows that the sound pressure level of the band-pass mode in the frequency band is improved by about 1.5-4 dB. Therefore, the change of the structure causes great change in sound between the band-pass sound box and the non-band-pass sound box. The band-pass sound box has high efficiency in a certain frequency range, and the efficiency is mostly not more than one octave. The bandpass enclosure may be constructed in different ways. Typically the bandpass system provides two chambers. A chamber containing the loudspeaker, which may be closed or form a bass reflex enclosure. The bandpass effect is produced by a second chamber located in front of the speaker aperture. This additional chamber is provided with a bass reflex aperture. The combination of two bass reflex chambers may extend the transmission range. The advantage of the bandpass enclosure is that it will be more efficient when applied to a bass reflex enclosure, and smaller in size as a horn structure, the bandpass enclosure is suitable for use in locations where high sound pressure levels are required.

Referring to fig. 6, the phase curves of the front horn only and the rear horn only after the adjustment of the rear band-pass horn are tested at the rear. And only the front loudspeaker is turned on, other loudspeaker sound sources of the sound box are turned off, the testing microphone is placed behind the sound box, and the phase curve of the front loudspeaker is measured. And only the rear loudspeaker is turned on, other loudspeaker sound sources of the sound box are turned off, the testing microphone is placed behind the sound box, and the phase curve of the rear loudspeaker is measured.

After the test result is obtained, a horn phase line graph is measured through comparison, and the parameter setting of the rear band-pass horn is adjusted by using the electronic DSP processor, so that the phase of the rear band-pass horn is changed to be different from the phase of the front horn by 180 degrees. (as shown in the above diagram, two points on the two phase waveform diagrams in the diagram can adjust the phase by setting, one point is located at 60 degrees in the positive direction, the other point is located at 120 degrees in the negative direction, and the phase difference between the two points is just 180 degrees), so that the bandpass loudspeaker at the back of the sound box can greatly counteract the interference of the front loudspeaker to the back direction.

Referring to fig. 7, a frequency response curve is shown when only the front horn is tested in the rear and the front and rear horns are sounded together in the rear. The frequency response curve of only the front woofer is tested at the rear part of the sound box, and the waveform peak value of the frequency response curve is large at 50Hz-250Hz, which shows that the front woofer has great interference on the audio-visual area at the rear part of the sound box when in occurrence. When the front loudspeaker and the rear loudspeaker sound together when the rear part of the sound box is tested, the waveform peak value of a frequency response curve is small when the frequency response curve is 50Hz-250Hz, which shows that the dryness of the audio-visual area at the rear part of the sound box is obviously improved when the front bass loudspeaker occurs compared with the front test. The whole frequency is obviously reduced by 3-6dB at 50Hz-250Hz, the sound production of the front low-frequency loudspeaker is counteracted, and the sound box with a band-pass structure is applied to a stage to counteract the redundant bass of the rear part, so that the sound on the stage is cleaner, and the performance of various musical instruments is easier to hear.

Referring to fig. 8, acoustic straight ahead measurements: when the rear band-pass loudspeaker unit is not started, the medium-low frequency response curve is obtained; referring to fig. 9, acoustic straight ahead measurements: when the rear band-pass speaker unit is started, the whole medium and low frequency (100 Hz-200 Hz) is obviously improved;

when the sound box is measured in the front, the curve comparison between the two results in an obvious gain effect at the frequency range of 100Hz-200Hz, and the medium-low frequency is obviously improved.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. The utility model provides a full frequency channel audio amplifier of linear band-pass with offset unnecessary bass in rear, a serial communication port, including case (1) of rear side diagonal inward bending, be close to be equipped with high pitch horn (2) subassembly on the inboard of case (1) preceding curb plate, the both sides of high pitch horn (2) subassembly are equipped with place ahead woofer (3), are close to case (1) rear side diagonal department is equipped with the band-pass audio amplifier that the symmetry set up, the band-pass audio amplifier include with case (1) lateral wall parallel and level and backward extension baffle (4) and locate locating plate (5) at case (1) rear portion, the relative inboard of baffle (4) be equipped with baffle (4) parallel arrangement's mounting panel, the inboard of mounting panel is equipped with rear woofer (6), the mounting panel inboard locating plate (5) inboard with case (1) rear portion outside constitutes raises the sound chamber (7), two raise the looks hole (8) of seting up the opposite direction on the sound chamber (7).

2. The linear band-pass full band speaker with cancel unnecessary bass in rear according to claim 1, wherein the tweeter horn (2) assembly comprises a tweeter horn (2), the housing (1) is provided with a tweeter sound outlet corresponding to the tweeter horn (2), and the upper end of the tweeter horn (2) is provided with a tweeter (9).

3. The linear band-pass full band speaker with cancellation of unwanted rear bass sound according to claim 1, wherein the outer cover of the tweeter horn (2) assembly is provided with a tweeter (10), and the upper part of the tweeter (10) is provided with a midrange horn (11).

4. The linear band-pass full band loudspeaker with rear unwanted bass cancellation according to claim 1, wherein the tweeters (11) are symmetrically arranged on both sides of the tweeter horn (2) assembly.

5. The linear band-pass full band speaker with canceling rear unwanted bass according to claim 1, wherein the mounting plate is disposed in an inverted L shape, and the upper portion of the mounting plate and the lower portion of the positioning plate (5), and the upper portion of the baffle (4) and the lower portion of the positioning plate (5) form a phase guide hole (8).

6. The linear band-pass full band speaker with the function of canceling the excessive bass sound at the rear according to claim 1, wherein the upper portion of the mounting plate is fixedly connected with the lower portion of the positioning plate (5), and the positioning plate (5) and the outside of the rear portion of the cabinet (1) form a phase guide hole (8).