A bus voltage open-loop control circuit

Abstract

The invention relates to the technical field of open-loop circuits, and discloses a bus voltage open-loop control circuit, comprising a bus, and also comprising: an audio main shell; an opening adjustment mechanism, wherein the opening adjustment mechanism is arranged inside the audio main shell, the opening adjustment mechanism comprises a circuit box fixedly connected inside the audio main shell, and an isolation mechanism, wherein the isolation mechanism is arranged inside the audio main shell, and the isolation mechanism comprises a motor fixedly connected to a side of the circuit box away from the bus. The bus voltage open-loop control circuit is connected with a noise detection device and an audio control module in the bus voltage open-loop control circuit, so that the audio control module can adjust the working state of the gas rod and the motor when the audio knob is rotated according to the result fed back by the noise detection device, thereby adding a feedback function to the open-loop control circuit which does not have a feedback function, and does not change the original open-loop control circuit, so that the audio can be adjusted in real time according to the real-time situation outside the audio.

Description

Technical Field

[0001] The invention relates to the technical field of open-loop circuits, in particular to a bus voltage open-loop control circuit. Background Art

[0002] A bus is a common path that connects multiple devices in the form of parallel branches. All connected devices can transmit data on the bus, but only one device can send data at the same time. Open-loop control refers to a control circuit method in which the open-loop control line and its controlled object have only a one-way effect without feedback. For example, in an audio system, the user controls the volume by adjusting the volume knob. The user's input directly controls the volume of the audio output without considering the state of the audio system itself.

[0003] When the external environment is noisy, if the sound of the speaker remains constant, the sound emitted by the speaker may not be able to spread effectively, thereby reducing the user's experience of the speaker. When the user needs to adjust the speaker, he needs to turn the knob of the speaker to adjust the volume of the speaker. However, due to the different environments in which the users are located, whether noisy or quiet, the amplitude of the knob rotation is also different. However, since the open-loop control circuit does not have a feedback function, when the user of the speaker adjusts the volume of the speaker through the knob, he cannot adjust the volume in real time according to the real-time external situation, thereby affecting the user's experience of the speaker. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a bus voltage open-loop control circuit, which solves the problems raised in the above background technology.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: A bus voltage open-loop control circuit includes a bus, and also includes:

[0008] Main speaker shell;

[0009] An opening adjustment mechanism, the opening adjustment mechanism is arranged inside the main housing of the speaker, the opening adjustment mechanism includes a circuit box fixedly connected inside the main housing of the speaker, and the opening adjustment mechanism is used to adjust the sound diffusion mode;

[0010] The isolating mechanism is arranged inside the main shell of the speaker, and comprises a motor fixedly connected to the side of the circuit box away from the busbar, and is used to isolate the sound from propagating backwards.

[0011] Preferably, the busbar is fixedly connected with a small circuit, the small circuit extends to the inside of the audio main shell and is fixedly connected to the circuit box, a dust cap is fixedly connected to the middle of the side of the circuit box away from the busbar, the dust cap extends to the outside of the audio main shell, a fixing rod is fixedly connected to the side of the circuit box close to the dust cap, a rotating shaft is fixedly connected to the side of the fixing rod away from the circuit box, a first rotating turntable and a second rotating turntable are rotatably connected at equidistant annular intervals on the outside of the rotating shaft, the diameter of the first rotating turntable is larger than the diameter of the second rotating turntable, the first rotating turntable is located between adjacent second rotating turntables, the second rotating turntable is located between adjacent first rotating turntables, the angle between adjacent first rotating turntables is 120°, and the angle between adjacent second rotating turntables is 120°.

[0012] Preferably, the circuit box is fixedly connected to a gas rod at the center of one side close to the rotating shaft, and a friction transmission rod is fixedly connected to one end of the gas rod close to the rotating shaft. The friction transmission rod extends into the rotating shaft, and the first rotating turntable and the second rotating turntable are both slidably connected to the friction transmission rod, so that the first arc plate and the second arc plate are driven to rotate by the movement of the friction transmission rod, thereby adjusting the opening size of the phase cone formed by the first arc plate and the second arc plate, and then adjusting the range and size of the sound emitted by the speaker.

[0013] Preferably, a fixing ring is fixedly connected to one side of the circuit box close to the dust cap, a rotating rod is rotatably connected inside the fixing ring, the rotating rods are equidistantly arranged at annular intervals on the outside of the fixing ring, and the rotating rod is transmission-connected to the first rotating turntable via a belt, a rotating long plate is fixedly connected to the outside of the rotating rod, an end of the rotating long plate away from the rotating rod is rotatably connected to a first arc plate, and the first arc plate is located on the outside of one end of the dust cap away from the circuit box.

[0014] Preferably, a side of the circuit box close to the dust cap is fixedly connected to a circular rotating shaft, a second arc plate is rotatably connected to the outer side of the circular rotating shaft, the second arc plates are equidistantly arranged at circular intervals on the outer side of the circular rotating shaft, and the side of the second arc plate close to the circular rotating shaft is transmission-connected to the second rotating turntable via a belt.

[0015] Preferably, the first arc plate and the second arc plate together form a phase cone when they are located at the same height, and a rubber limiting ring is clamped on one side of the first arc plate and the second arc plate away from the main housing of the speaker.

[0016] Preferably, noise detectors are fixedly connected to the inner walls on both sides of the main housing of the audio system. The noise detectors are connected to circuits, which extend to the outside of the main housing of the audio system and are fixedly connected to noise detection heads.

[0017] Preferably, the motor output end is fixedly connected to a gear, the upper side of the gear is meshedly connected to a first sound insulation arc plate, the lower side of the gear is meshedly connected to a second sound insulation arc plate, and the first sound insulation arc plate and the second sound insulation arc plate are both slidably connected to the main shell of the speaker.

[0018] Preferably, the first sound insulation arc plate and the second sound insulation arc plate are both provided with arc grooves on the side away from the motor, so that the first sound insulation arc plate and the second sound insulation arc plate can use the arc grooves to reflect sound waves during the left and right reciprocating motion, thereby preventing the sound of the speakers from affecting the detection of noise by the noise detection head.

[0019] Preferably, the busbar is connected to at least two circuit boxes through a small circuit, and the circuit box includes an audio control circuit and an audio control module, and the audio control module is connected to the output end of the noise detector;

[0020] The sound control module drives the gas rod and the motor respectively.

[0021] (III) Beneficial effects

[0022] The bus voltage open-loop control circuit provided by the present invention has the following beneficial effects:

[0023] 1. A bus voltage open-loop control circuit drives the first rotating turntable and the second rotating turntable to rotate by moving a friction transmission rod, and then drives the first arc plate and the second arc plate to rotate, so as to adjust the opening size of the phase cone composed of the first rotating turntable and the second rotating turntable, so that the sound emitted from the dust cap is reflected after contacting the inner wall of the phase cone, thereby expanding the reflection range of the sound and increasing the propagation area of ​​the sound. When the opening of the phase cone is small, the inner wall of the phase cone contacts the sound and causes the sound to be reflected, so that the propagation area of ​​the sound is reduced and the propagation distance is increased, which is more suitable for transmitting sound to a certain place in a noisy environment, thereby providing a variety of choices for audio users.

[0024] 2. This bus voltage open-loop control circuit, by driving the first sound insulation arc plate and the second sound insulation arc plate to reciprocate left and right under the drive of the motor, so that when the sound wave is emitted into the arc groove, the sound wave will contact the inner wall of the arc groove, and at the moment of contact, the first sound insulation arc plate doing reciprocating motion provides a left or right force for the sound wave in contact with itself, and because the inner wall of the arc groove is inclined, the directions of the sound wave after being reflected by the inner wall of the arc groove are different, and then cooperate with the initial velocity in the left and right directions provided to the sound wave by the inner wall of the arc groove, so that the area of ​​the sound reflected outward is also larger, thereby increasing the sound emission area of ​​the sound and improving the use effect of the sound.

[0025] 3. This bus voltage open-loop control circuit connects a noise detection device and an audio control module in the bus voltage open-loop control circuit, so that the audio control module can adjust the working state of the gas rod and the motor when the audio knob is rotated according to the feedback result of the noise detection device, thereby adding a feedback function to the open-loop control circuit that does not have a feedback function without changing the original open-loop control circuit, so that the audio can be adjusted in real time according to the real-time situation outside the audio.

[0026] 4. This bus voltage open-loop control circuit is located at the end of the first arc plate and the second arc plate away from the circuit box through a rubber limit ring, thereby integrating the first arc plate and the second arc plate away from the gas rod, preventing the second arc plate and the first arc plate from overlapping due to rotation to produce a large gap, thereby enhancing the sound amplification effect of the phase cone composed of the first arc plate and the second arc plate.

[0027] 5. This bus voltage open-loop control circuit controls multiple speakers to work simultaneously through the bus, thereby utilizing the advantages of the bus's safe operation, high reliability, and low heat generation, making the operation of the speakers controlled by the open-loop circuit more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the circuit of the present invention;

[0029] Figure 2 This is a schematic diagram of the connection structure between the busbar and the main housing of the audio system of the present invention;

[0030] Figure 3 This is a schematic diagram of the connection structure of the main housing of the sound system, the noise detector and the noise detection head of the present invention;

[0031] Figure 4 It is a schematic diagram of the circuit box, the dust cap, the first sound insulation arc plate and the connection structure of the first sound insulation arc plate of the present invention;

[0032] Figure 5 It is a schematic diagram of the overall structure of the opening adjustment mechanism of the present invention;

[0033] Figure 6 It is a schematic diagram of the connection structure of the fixed rod, the rotating shaft, the first rotating turntable and the second rotating turntable of the present invention;

[0034] Figure 7 It is a schematic diagram of the connection structure of the gas rod, the friction transmission rod, the rotating shaft, the first rotating turntable and the second rotating turntable of the present invention;

[0035] Figure 8 It is a schematic diagram of the connection structure between the circuit box and the dust cap of the present invention;

[0036] Fig. 9It is a schematic diagram of the connection structure of the fixing ring, the rotating rod, the rotating long plate, the first arc plate, the second arc plate, the annular rotating shaft and the rubber limiting ring of the present invention;

[0037] Fig.10 It is a schematic diagram of the connection structure of the gas rod, the fixed ring, the rotating long plate, the first arc plate and the second arc plate of the present invention;

[0038] Fig.11 It is a schematic diagram of the connection structure of the fixed rod, the first rotating turntable, the gas rod, the fixed ring, the rotating rod, the rotating long plate and the first arc plate of the present invention;

[0039] Fig.12 It is a schematic diagram of the side structure of the rotating rod, the rotating long plate and the first arc plate of the present invention;

[0040] Fig.13 It is a schematic diagram of the connection structure of the fixed rod, the second rotating turntable, the gas rod, the second arc plate and the annular rotating shaft of the present invention;

[0041] Fig.14 It is a schematic diagram of the structure of the motor, gear, first sound insulation arc plate and second sound insulation arc plate of the present invention;

[0042] Fig.15 It is a schematic diagram of the back structure of the motor, the first sound insulation arc plate and the second sound insulation arc plate of the present invention;

[0043] Fig.16 It is a schematic diagram of the connection structure of the first sound insulation arc plate and the arc groove of the present invention.

[0044] In the figure: 1. busbar;

[0045] 2. Main speaker shell;

[0046] Opening adjustment mechanism: 3, circuit box; 31, dust cap; 32, fixed rod; 321, rotating shaft; 322, first rotating turntable; 323, second rotating turntable; 33, gas rod; 331, friction transmission rod; 34, fixed ring; 341, rotating rod; 342, rotating long plate; 343, first arc plate; 35, second arc plate; 351, annular rotating shaft; 36, rubber limiting ring;

[0047] 4. Motor; 41. Gear; 42. First sound insulation arc plate; 43. Second sound insulation arc plate; 44. Noise detector; 441. Noise detection head; 45. Arc groove. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0049] refer to Figures 1 to 13 A bus voltage open-loop control circuit according to a preferred embodiment of the present invention will be described in detail below:

[0050] Bus 1;

[0051] Audio main shell 2;

[0052] An opening adjustment mechanism, the opening adjustment mechanism is arranged inside the main housing 2 of the speaker, the opening adjustment mechanism comprises a circuit box 3 fixedly connected inside the main housing 2 of the speaker, and the opening adjustment mechanism is used to adjust the sound diffusion mode;

[0053] The isolation mechanism is arranged inside the main housing 2 of the audio system. The isolation mechanism includes a motor 4 fixedly connected to a side of the circuit box 3 away from the busbar 1. The isolation mechanism is used to isolate the sound from propagating backwards.

[0054] The busbar 1 is fixedly connected with a small circuit, which extends to the inside of the audio main shell 2 and is fixedly connected to the circuit box 3. A dust cap 31 is fixedly connected to the middle of the side of the circuit box 3 away from the busbar 1, and the dust cap 31 extends to the outside of the audio main shell 2. A fixing rod 32 is fixedly connected to the side of the circuit box 3 close to the dust cap 31, and a rotating shaft 321 is fixedly connected to the side of the fixing rod 32 away from the circuit box 3. A first rotating turntable 322 and a second rotating turntable 323 are rotatably connected at equidistant annular intervals on the outside of the rotating shaft 321. The diameter of the first rotating turntable 322 is larger than that of the second rotating turntable 323. The first rotating turntable 322 is located between adjacent second rotating turntables 323, and the second rotating turntable 323 is located between adjacent first rotating turntables 322. The angle between adjacent first rotating turntables 322 is 120°, and the angle between adjacent second rotating turntables 323 is 120°.

[0055] A gas rod 33 is fixedly connected to the center of one side of the circuit box 3 near the rotating shaft 321, and a friction transmission rod 331 is fixedly connected to one end of the gas rod 33 near the rotating shaft 321. The friction transmission rod 331 extends into the rotating shaft 321. The first rotating turntable 322 and the second rotating turntable 323 are both slidably connected to the friction transmission rod 331, so that the movement of the friction transmission rod 331 drives the rotation of the first arc plate 343 and the second arc plate 35, thereby adjusting the opening size of the phase cone formed by the first arc plate 343 and the second arc plate 35, and then adjusting the range and size of the sound emitted by the speaker.

[0056] A fixing ring 34 is fixedly connected to one side of the circuit box 3 close to the dust cap 31, and a rotating rod 341 is rotatably connected inside the fixing ring 34. The rotating rods 341 are arranged at equidistant annular intervals on the outside of the fixing ring 34, and the rotating rods 341 are transmission-connected to the first rotating turntable 322 through a belt. A rotating long plate 342 is fixedly connected to the outside of the rotating rod 341, and the end of the rotating long plate 342 away from the rotating rod 341 is rotatably connected to the first arc plate 343. The first arc plate 343 is located on the outside of the dust cap 31 away from the circuit box 3.

[0057] A circular rotating shaft 351 is fixedly connected to one side of the circuit box 3 close to the dust cap 31, and a second arc plate 35 is rotatably connected to the outer side of the circular rotating shaft 351. The second arc plates 35 are arranged at equidistant annular intervals on the outer side of the circular rotating shaft 351, and the side of the second arc plate 35 close to the circular rotating shaft 351 is transmission connected to the second rotating turntable 323 through a belt.

[0058] The first arc plate 343 and the second arc plate 35 together form a phase cone when they are located at the same height. The first arc plate 343 and the second arc plate 35 are both clamped with a rubber limiting ring 36 on one side away from the main housing 2 of the speaker.

[0059] The following is the entire working process and working principle of the above embodiment:

[0060] Initial definition: the second arc plate 35 overlaps with the first arc plate 343 and the second arc plate 35 is inside the first arc plate 343, and the phase cone formed by the plurality of second arc plates 35 and the first arc plate 343 has a smaller opening amplitude. The gas rod 33 is in a retracted state, and the friction transmission rod 331 fixedly connected to the end away from the circuit box 3 does not contact the first rotating turntable 322 and the second rotating turntable 323.

[0061] When the user turns the knob in a relatively quiet environment, the audio control module retrieves the noise decibel level and duration detected by the noise detection device, and transmits the signal to the audio equipment circuit. At this time, the controller in the audio equipment circuit controls the extension of the gas rod 33 fixedly connected to the circuit box 3 based on the noise decibel level and duration. The extension of the gas rod 33 is proportional to the noise decibel level and duration.

[0062] When the gas rod 33 is extended:

[0063] like Figure 7As shown, after the air rod 33 is extended, the friction transmission rod 331 fixedly connected to one end of the air rod 33 away from the circuit box 3 moves toward the rotating shaft 321, and finally enters the inner side of the rotating shaft 321, and continues to move. When the friction transmission rod 331 enters the inner side of the rotating shaft 321, the friction transmission rod 331 contacts the first rotating turntable 322 on its outer side, so that the friction force generated by the contact with the first rotating turntable 322 drives the first rotating turntable 322 to rotate clockwise, as shown in FIG. Fig.11 As shown in FIG. 1 , when the first rotating turntable 322 rotates clockwise, the first rotating turntable 322 drives the rotating rod 341 to rotate clockwise through the belt transmission, and the rotating rod 341 drives the rotating long plate 342 fixedly connected to itself to rotate clockwise. Since the rotating long plate 342 is rotatably connected to the first arc plate 343, as shown in FIG. Fig.12 As shown, when the rotating long plate 342 rotates clockwise, the rotating long plate 342 provides an upward force for the first arc plate 343, so that the first arc plate 343 is pulled upward by the rotating long plate 342, thereby enlarging the opening of the phase cone-like structure composed of multiple first arc plates 343.

[0064] At the same time, when the friction transmission rod 331 enters the inner side of the rotating shaft 321 and continues to move forward, the friction transmission rod 331 also drives the second rotating turntable 323 to rotate clockwise through the friction force generated by the contact with the second rotating turntable 323. When the second rotating turntable 323 rotates, it drives the second arc plate 35 to rotate clockwise through the transmission of the belt, and because the second arc plate 35 is rotatably connected with the annular rotating shaft 351, the second arc plate 35 rotates clockwise around the annular rotating shaft 351, and when the second arc plate 35 rotates clockwise, the opening of the structure similar to the phase cone formed by it and other multiple second arc plates 35 becomes larger.

[0065] In summary, when the friction transmission rod 331 moves toward the dust cap 31 and enters the inner side of the rotating shaft 321, the friction transmission rod 331 can drive the multiple first rotating turntables 322 and the second rotating turntables 323 on the outer side to rotate clockwise at the same time, and then through a series of matching connections between the various components, the first arc plate 343 and the second arc plate 35 rotate clockwise, thereby expanding the sound phase cone opening composed of the multiple first arc plates 343 and the second arc plates 35. Since the sound phase cone opening is within a suitable range, when the sound diffuses from the inside of the phase cone to the outside, the sound is As the phase cone opening is enlarged, the sound emitted from the dust cap 31 contacts the inner wall of the phase cone and is reflected, which expands the reflection range of the sound and makes the sound scattered more widely, thereby increasing the propagation area of ​​the sound. When the phase cone opening is smaller, the inner wall of the phase cone contacts the sound and causes the sound to be reflected, so that the sound is restricted by the inner wall of the phase cone, and the direction of movement of the sound after reflection is also smaller, thereby reducing the propagation area of ​​the sound and increasing the propagation distance, which is more suitable for transmitting sound to a certain place in a noisy environment.

[0066] During the entire rotation process of the second arc plate 35 and the first arc plate 343, since the diameter of the first rotating turntable 322 is larger than the diameter of the second rotating turntable 323, the rotation amplitude, i.e., the angular velocity, of the first rotating turntable 322 is smaller than the rotation velocity, i.e., the angular velocity, of the second rotating turntable 323 through the transmission of the belt. As a result, under the transmission of the belt, the angular velocity of the first arc plate 343 connected to the first rotating turntable 322 is smaller than the angular velocity of the second arc plate 35 connected to the second rotating turntable 323. As a result, when the phase cone opening formed by the first arc plate 343 and the second arc plate 35 is at its largest, the first arc plate 343 and the second arc plate 35 are as follows: Figure 4 As shown, a standard phase cone shape is formed, and when the first arc plate 343 and the second arc plate 35 rotate toward the dust cap 31, the second arc plate 35 rotates faster than the first arc plate 343, so that the second arc plate 35 contracts inwardly to between two adjacent first arc plates 343, and then the second arc plate 35 overlaps with the first arc plate 343 to form a phase cone with a smaller opening. During this process, the opening of the phase cone gradually becomes smaller. If the opening of the phase cone is to be enlarged, the principle is the same and will not be repeated here. Example

[0067] refer to Figures 14 to 16 Noise detectors 44 are fixedly connected to the inner walls of both sides of the main housing 2 of the audio system. The noise detectors 44 are connected to a circuit. The circuit extends to the outside of the main housing 2 of the audio system and is fixedly connected to a noise detection head 441.

[0068] A gear 41 is fixedly connected to the output end of the motor 4, a first sound insulation arc plate 42 is meshedly connected to the upper side of the gear 41, and a second sound insulation arc plate 43 is meshedly connected to the lower side of the gear 41. Both the first sound insulation arc plate 42 and the second sound insulation arc plate 43 are slidably connected to the main housing 2 of the audio system.

[0069] The first sound insulation arc plate 42 and the second sound insulation arc plate 43 are both provided with an arc groove 45 on the side away from the motor 4, so that the first sound insulation arc plate 42 and the second sound insulation arc plate 43 can use the arc groove 45 to reflect sound waves during the left and right reciprocating movement, thereby preventing the sound of the speakers from affecting the detection of noise by the noise detection head 441.

[0070] The busbar 1 is connected to at least two circuit boxes 3 through a small circuit. The circuit box 3 includes an audio control circuit and an audio control module. The audio control module is connected to the output end of the noise detector 44.

[0071] The sound control module drives the gas rod 33 and the motor 4 respectively.

[0072] The following is the entire working process and working principle of the above embodiment:

[0073] Initial state: the noise detector 44 and the noise detection head 441 continuously and automatically detect the decibel level of the surrounding noise. Half of the volume of the first sound insulation arc plate 42 and the second sound insulation arc plate 43 slidingly connected on both sides of the audio main shell 2 is outside the audio main shell 2, blocking the sound emitted from the phase cone from transmitting to the rear, avoiding the sound from interfering with the noise detection of the noise detection head 441, and improving the accuracy of the noise detection head 441 in detecting the decibel level.

[0074] At the same time, the noise detector 44 transmits the decibel level of the noise detected by the noise detection head 441 to the circuit box 3, and the audio control module inside the circuit box 3 controls the motor 4 to start, and the motor 4 drives the gear 41 fixedly connected to its output end to rotate alternately clockwise and counterclockwise, and the rotation speed of the output end of the motor 4 is proportional to the decibel level of the noise detected by the noise detection head 441. When the motor 4 rotates alternately clockwise and counterclockwise, the first sound insulation arc plate 42 and the second sound insulation arc plate 43 meshing with the gear 41 also begin to reciprocate to the left and right. At this time, the sound waves emitted from the phase cone are reflected by the outside world and move toward the first sound insulation arc plate 42 and the second sound insulation arc plate 43. At this time, the first sound insulation arc plate 42 and the second sound insulation arc plate 43 continue to reciprocate to the left and right, so Fig.16As shown, when the sound waves are emitted into the arc groove 45 opened by the first sound insulation arc plate 42, the sound waves will contact the inner wall of the arc groove 45, and at the moment of contact, the first sound insulation arc plate 42 that makes reciprocating motion provides a left or right force for the sound waves that contact itself, and because the inner wall of the arc groove 45 is inclined, the directions of the sound waves after being reflected by the inner wall of the arc groove 45 are different, and then the initial velocity in the left and right directions provided to the sound waves by the inner wall of the arc groove 45 is combined, so that the area of ​​the sound reflected outward is also larger, thereby increasing the sound emission area of ​​the sound and improving the use effect of the sound. The principle of the second sound insulation arc plate 43 is the same as this, and will not be repeated here.

[0075] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bus voltage open-loop control circuit, comprising a bus (1), characterized in that: Also includes: Main speaker housing (2); An opening adjustment mechanism, the opening adjustment mechanism being arranged inside the main housing (2) of the speaker, the opening adjustment mechanism comprising a circuit box (3) fixedly connected inside the main housing (2) of the speaker, the opening adjustment mechanism being used to adjust a sound diffusion mode; An isolation mechanism, the isolation mechanism being arranged inside the main housing (2) of the speaker, the isolation mechanism comprising a motor (4) fixedly connected to a side of the circuit box (3) away from the busbar (1), the isolation mechanism being used to isolate sound from propagating backwards; The busbar (1) is fixedly connected to a small circuit, the small circuit extends into the interior of the speaker main housing (2) and is fixedly connected to a circuit box (3), a dust cap (31) is fixedly connected to the middle of a side of the circuit box (3) away from the busbar (1), the dust cap (31) extends to the outside of the speaker main housing (2), a fixing rod (32) is fixedly connected to a side of the circuit box (3) close to the dust cap (31), a rotating shaft (321) is fixedly connected to a side of the fixing rod (32) away from the circuit box (3), and the rotating shaft (321) is equidistant from the outside. A first rotating turntable (322) and a second rotating turntable (323) are rotatably connected in an annular manner, the diameter of the first rotating turntable (322) is larger than the diameter of the second rotating turntable (323), the first rotating turntable (322) is located between adjacent second rotating turntables (323), the second rotating turntable (323) is located between adjacent first rotating turntables (322), the angle between adjacent first rotating turntables (322) is 120°, and the angle between adjacent second rotating turntables (323) is 120°; A gas rod (33) is fixedly connected to the center of one side of the circuit box (3) close to the rotating shaft (321); a friction transmission rod (331) is fixedly connected to one end of the gas rod (33) close to the rotating shaft (321); the friction transmission rod (331) extends into the rotating shaft (321); and the first rotating turntable (322) and the second rotating turntable (323) are both slidably connected to the friction transmission rod (331); A fixing ring (34) is fixedly connected to a side of the circuit box (3) close to the dust cap (31); a rotating rod (341) is rotatably connected inside the fixing ring (34); the rotating rods (341) are arranged at equal intervals on the outside of the fixing ring (34) in an annular manner; the rotating rods (341) are transmission-connected to a first rotating turntable (322) via a belt; a rotating long plate (342) is fixedly connected to the outside of the rotating rod (341); an end of the rotating long plate (342) away from the rotating rod (341) is rotatably connected to a first arc plate (343); the first arc plate (343) is located outside the end of the dust cap (31) away from the circuit box (3); A side of the circuit box (3) close to the dust cap (31) is fixedly connected to a circular rotating shaft (351), and a second arc plate (35) is rotatably connected to the outside of the circular rotating shaft (351). The second arc plates (35) are arranged at equidistant annular intervals on the outside of the circular rotating shaft (351), and a side of the second arc plate (35) close to the circular rotating shaft (351) is transmission-connected to a second rotating turntable (323) via a belt; The first arc plate (343) and the second arc plate (35) together form a phase cone when they are located at the same height, and a rubber limiting ring (36) is clamped on the side of the first arc plate (343) and the second arc plate (35) away from the main housing (2) of the speaker.

2. A bus voltage open-loop control circuit according to claim 1, characterized in that: Noise detectors (44) are fixedly connected to the inner walls on both sides of the main housing (2) of the speaker, and the noise detector (44) is connected to a circuit, which extends to the outside of the main housing (2) of the speaker and is fixedly connected to a noise detection head (441).

3. A bus voltage open-loop control circuit according to claim 1, characterized in that: The output end of the motor (4) is fixedly connected to a gear (41), the upper side of the gear (41) is meshingly connected to a first sound insulation arc plate (42), the lower side of the gear (41) is meshingly connected to a second sound insulation arc plate (43), and the first sound insulation arc plate (42) and the second sound insulation arc plate (43) are both slidably connected to the main housing (2) of the sound system.

4. A bus voltage open-loop control circuit according to claim 3, characterized in that: The first sound insulation arc plate (42) and the second sound insulation arc plate (43) are both provided with an arc-shaped groove (45) on one side away from the motor (4).

5. A bus voltage open-loop control circuit according to claim 3, characterized in that: The busbar (1) is connected to at least two circuit boxes (3) via a small circuit, the circuit box (3) comprising an audio control circuit and an audio control module, and the audio control module is connected to an output end of a noise detector (44); The sound control module drives the gas rod (33) and the motor (4) respectively.

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