CN116156368A

CN116156368A - Sound box, sound system and sound box calibration method

Info

Publication number: CN116156368A
Application number: CN202310343661.3A
Authority: CN
Inventors: 邬宁
Original assignee: Fengfan Suzhou Audio Techonology Co ltd; Jiangxi Feier Technology Co ltd
Current assignee: Fengfan Suzhou Audio Techonology Co ltd; Jiangxi Feier Technology Co ltd
Priority date: 2023-04-03
Filing date: 2023-04-03
Publication date: 2023-05-23
Anticipated expiration: 2043-04-03
Also published as: CN116156368B

Abstract

The invention provides a sound box, a sound system and a sound box calibration method, wherein the sound box comprises: a housing; a speaker disposed in the housing; the loudspeaker box calibration assembly is arranged in the shell and connected with the shell and the loudspeaker, the loudspeaker box calibration assembly comprises an electric universal shaft and at least two direction calibrators arranged on the electric universal shaft, and the loudspeaker is connected with the shell through the electric universal shaft. According to the invention, the sound box can automatically calibrate the sound outlet direction of the loudspeaker according to the direction calibration signal transmitted or received by the direction calibrator, so that the sound box can reach an optimal sound outlet direction wherever placed, thus the direct sound at the listening position can be increased, the room reflected sound is weakened, the mutual interference of the reflected sound and the sound wave of the direct sound at the listening position is greatly reduced, and the total space radiation efficiency and the playback effect are greatly improved.

Description

Sound box, sound system and sound box calibration method

Technical Field

The invention relates to the technical field of sound systems, in particular to a sound box, a sound system and a sound box calibration method.

Background

Home audio systems are generally referred to as home theater audio systems. Home audio systems are products of a highly perfect combination of today's digital and analog audio technologies that realistically reproduce audio effects that are enjoyed only in theatres in a home environment.

In a sound system such as a home sound system or a cinema sound system, there is a significant problem that: the specific frequency band of the sound box can be reflected by a room, generated reflected sound (including early high-energy reflected sound waves such as primary reflection and secondary reflection) can interfere with the direct sound at the listening position, and the following problems can occur after the interference of the sound waves:

1) The efficiency of the full space radiation is further reduced (cancellation of the acoustic energy of a specific frequency band);

2) The acoustic replay frequency response curve has peaks and valleys and is uneven (different interference effects of each frequency band), so that the acoustic replay frequency response curve cannot be truly restored;

thus, even expensive high-quality speaker units, sound boxes, and audio equipment cannot achieve very desirable playback effects due to the acoustic characteristics of the room itself or the placement position of the sound boxes.

Disclosure of Invention

Accordingly, the present invention is directed to a loudspeaker, a sound system and a loudspeaker calibration method, so as to solve at least one technical problem in the prior art.

According to an embodiment of the present invention, a sound box includes:

a shell provided with at least a sound output structure;

a speaker disposed in the housing, wherein audio generated by the speaker can be transmitted through the sound output structure;

the loudspeaker box calibration assembly is arranged in the shell and is connected with the shell and the loudspeaker, the loudspeaker box calibration assembly comprises an electric universal shaft and at least two direction calibrators arranged on the electric universal shaft, and the loudspeaker is connected with the shell through the electric universal shaft;

the loudspeaker is coaxially arranged with the electric universal shaft, the direction calibrators are sequentially arranged at intervals along the axial direction of the electric universal shaft, the direction calibrators are coaxially arranged with the electric universal shaft, and the direction calibrators are used for transmitting or receiving direction calibration signals so as to calibrate the sound emitting direction of the loudspeaker according to the direction calibration signals.

Preferably, the shell is provided with three planes which are perpendicular to each other and a sound outlet surface connected with the three planes, and the sound outlet structure is arranged on the sound outlet surface.

Preferably, the speaker is connected to the vertical intersection point position of the three planes of the housing through the electric cardan shaft.

Preferably, the direction calibrator is a TOF transmitter or a TOF receiver.

Preferably, the electric universal shaft comprises a rotating end and a free end far away from the rotating end, the loudspeaker is fixedly arranged at the free end, and the electric universal shaft and the loudspeaker rotate around the rotating end;

wherein at least one of the direction aligners is provided on the rotating end.

The invention also provides a sound system, which is applied to a sound room, and comprises two sound boxes, wherein the two sound boxes are respectively arranged at the top corner positions of the room at two sides right in front of the preset listening position in the sound room.

Preferably, the sound outlet surface of the sound box is perpendicular to a line connecting a center point of a speaker in the sound box and a center point of the predetermined listening position.

Preferably, the six surfaces in the sound room are provided with acoustic decoration structures, and the acoustic decoration structures comprise one or more of carpets, curtains, sound absorption structures, sound scattering decoration structures and diffuse reflection decoration structures.

The invention also provides a sound box calibration method, wherein the sound box is the sound box, and the sound box calibration method comprises the following steps:

arranging an adaptive calibrator at a predetermined listening position, wherein one of the directional calibrator and the adaptive calibrator is a signal transmitter and the other is a signal receiver;

controlling the signal transmitter to transmit a direction calibration signal, and acquiring the time when the signal receiver receives the direction calibration signal, so as to obtain at least two signal receiving times;

and calculating the receiving time difference of any two signal receiving times, and controlling the electric universal shaft to adjust the sound emitting direction of the loudspeaker according to the receiving time difference until the receiving time difference reaches a time threshold.

Preferably, the step of controlling the electric cardan shaft to adjust the sound emitting direction of the speaker according to the receiving time difference until the receiving time difference reaches a time threshold value comprises:

the azimuth direction and the elevation direction of the electric universal shaft are controlled to rotate at random once, and a reference direction calibrator and a dynamic direction calibrator on the electric universal shaft are determined according to the change of the receiving time difference before and after rotation;

determining an azimuth calibration direction and an elevation calibration direction according to the change of the corresponding signal receiving time before and after the dynamic direction calibrator rotates;

and controlling the electric universal shaft to rotate in a stepping way towards the azimuth angle calibration direction and the elevation angle calibration direction so as to adjust the sound emitting direction of the loudspeaker until the receiving time difference reaches a time threshold.

Compared with the prior art: the direction of the loudspeaker in the sound box is adjusted by coaxially arranging the electric universal shaft, and at least two direction calibrators are coaxially arranged on the electric universal shaft at intervals, so that the sound emitting direction of the loudspeaker can be automatically calibrated according to the direction calibration signals emitted or received by the direction calibrators, the sound box can reach an optimal sound emitting direction no matter where the sound box is arranged, the direct sound at the listening position can be increased, the room reflected sound is weakened, the mutual interference between the reflected sound and the sound wave of the direct sound at the listening position is greatly reduced, and the full-space radiation efficiency and the playback effect are greatly improved.

Drawings

Fig. 1 is a schematic perspective view of a sound box according to an embodiment of the present invention;

fig. 2 is a schematic front view of a sound box according to an embodiment of the invention;

FIG. 3 is a schematic cross-sectional view taken along line A-A in FIG. 2;

fig. 4 is an angular schematic diagram of a speaker according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a speaker direction calibration principle according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of an audio system according to a second embodiment of the present invention.

The invention will be further described in the following detailed description in conjunction with the above-described figures.

Detailed Description

In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Several embodiments of the invention are presented in the figures. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

In such sound systems as home sound systems and cinema sound systems, a specific frequency band of a sound box is reflected by a room, so that reflected sound is generated in the space, the generated reflected sound (including early high-energy reflected sound waves such as primary reflection and secondary reflection) and direct sound interfere with each other at a listening position, and the following problems occur after the interference of the sound waves:

thus, even expensive high-quality speaker units, sound boxes, and audio equipment cannot achieve very desirable playback effects due to the acoustic characteristics of the room itself or the placement position of the sound boxes. In order to solve the technical problem, the embodiment of the invention provides a sound box, a sound system and a sound box calibration method, wherein a brand new sound box structure capable of calibrating the sound outlet direction is provided by designing the internal structure of the sound box, so that the sound box can reach an optimal sound outlet direction wherever the sound box is placed, the influence of the acoustic characteristics of a room can be weakened, the direct sound at a listening position can be increased, the reflected sound of the room can be weakened, the interference between the reflected sound and the sound wave of the direct sound at the listening position can be greatly reduced, and meanwhile, a sound system and a sound box calibration method are adapted to the brand new sound box structure, and the specific scheme is specifically explained by the following embodiment.

Example 1

Referring to fig. 1-3, a loudspeaker box 10 according to an embodiment of the present invention includes a housing 11, a speaker 12 disposed in the housing 11, and a loudspeaker box calibration assembly 13 disposed in the housing 11 and connected to the housing 11 and the speaker 12, wherein:

the housing 11 is provided with at least a sound outlet structure, which may be, but not limited to, a sound outlet hole, a sound outlet net, etc., through which the audio generated by the speaker 12 can be transmitted. The speaker calibration assembly 13 includes an electric cardan shaft 131 and at least two direction calibrators 132 provided on the electric cardan shaft 131, and the speaker 12 is connected to the housing 11 through the electric cardan shaft 131. For better realizing the direction calibration, the speaker 12 is coaxially arranged with the electric universal shaft 131, and each direction calibrator 132 is sequentially arranged at intervals along the axial direction of the electric universal shaft 131, and each direction calibrator 132 is coaxially arranged with the electric universal shaft 131, and the direction calibrator 132 is used for transmitting or receiving a direction calibration signal to calibrate the sound emitting direction of the speaker 12 according to the direction calibration signal.

In the implementation of this embodiment, two direction aligners 132 are specifically disposed on the electric cardan shaft 131, and the direction aligners 132 are specifically TOF transmitters or TOF receivers, that is, each sound box 10 includes two TOF transmitters or TOF receivers that are uniquely disposed therein. Of course, the invention is not limited to this, and in other embodiments, more or other types of direction aligners may be provided according to actual needs. In some preferred embodiments, the electric cardan shaft 131 includes a rotating end 1311 and a free end 1312 remote from the rotating end 1311, the speaker 12 is fixed to the free end 1312, and the electric cardan shaft 131 and the speaker 12 rotate around the rotating end 1311, wherein at least one direction calibrator 132 is disposed on the rotating end 1311, and in this embodiment, one is disposed on the rotating end 1311 and the other is disposed on the free end 1312, so as to increase the distance between the direction calibrators 132, and facilitate subsequent direction calibrations. Since the electric cardan shaft 131 and the speaker 12 rotate around the rotation end 1311, the distance between the direction calibrator 132 disposed on the rotation end 1311 and the listening position is relatively fixed, so that the time for transmitting the direction calibration signal between the direction calibrator 132 and the listening position is relatively fixed or small in variation during the direction adjustment, that is, the corresponding signal receiving time is relatively fixed, so that the direction calibrator with the relatively fixed signal receiving time can be used as the reference direction calibrator, and the other direction calibrator can be used as the dynamic direction calibrator.

As shown in fig. 1 and 3, the housing 11 has three planes 111 perpendicular to each other and a sound outlet surface 112 connecting the three planes 111, that is, the loudspeaker 10 has a triangular pyramid shape, so that it is advantageous to arrange the sound outlet structure at the top corner of the room in the subsequent sound chamber, and the sound outlet structure is disposed on the sound outlet surface. As shown in fig. 2, the speaker 12 is connected to the positions of the vertical intersection points of the three planes 111 of the housing 11 through the electric universal shaft 131, so that the connection line between the center of the speaker 12 and the center of the listening position and the connection line between the top corner of the room where the sound box 10 is located and the center of the listening position are approximately collinear, which is more beneficial to ensuring the effect of subsequent direction adjustment.

Another aspect of the embodiment of the present invention further provides a method for calibrating a sound box in the first embodiment of the present invention, where the method for calibrating a sound box specifically includes steps S10 to S30. Wherein:

step S10, an adaptive calibrator adapted to the direction calibrator is arranged at the predetermined listening position, wherein one of the direction calibrator and the adaptive calibrator is a signal transmitter, and the other is a signal receiver.

In some alternatives of this embodiment, either of the following two schemes may be employed for the calibration arrangement: in the first scheme, the two direction calibrators in the sound box can be TOF receivers, and one TOF transmitter needs to be arranged at a preset listening position during calibration, and under the condition, a transmitting direction calibration signal of the TOF transmitter is received by the two TOF receivers; in the second scheme, the two direction calibrators inside the sound box can be TOF transmitters specifically, and a TOF receiver needs to be arranged at a preset listening position during calibration, and under the condition, the two TOF transmitters respectively transmit direction calibration signals which do not interfere with each other at the same time and are received by the TOF receiver. In the present embodiment, the first aspect is preferably adopted.

And step S20, controlling the signal transmitter to transmit a direction calibration signal, and acquiring the time when the signal receiver receives the direction calibration signal, so as to obtain at least two signal receiving times.

It should be appreciated that for the first solution, since both TOF receivers inside the loudspeaker respectively receive the direction calibration signal, two signal reception times are generated. For the second scheme, since the two TOF transmitters inside the sound box respectively and simultaneously transmit the direction calibration signals which do not interfere with each other, the direction calibration signal transmitted by each TOF transmitter is received by the TOF receiver, so that two signal receiving times are generated.

Step S30, calculating the receiving time difference of any two signal receiving times, and controlling the electric universal shaft to adjust the sound emitting direction of the loudspeaker according to the receiving time difference until the receiving time difference reaches a time threshold.

It should be noted that, the principle of automatic direction calibration in the embodiment of the present invention is as follows: firstly, the purpose of the direction calibration is to make the sound outlet surface of the sound box perpendicular to the connection line between the central point of the loudspeaker in the sound box and the central point of the preset listening position, namely, when the sound box is arranged at the top corner of a room, the sound outlet surface is as perpendicular to the connection line between the top corner of the room where the sound box is positioned and the central point of the preset listening position as possible, so that the optimal sound outlet direction can be achieved, the eighth space radiation theory is met, and when the sound outlet surface of the sound box is perpendicular to the connection line between the central point of the loudspeaker in the sound box and the central point of the preset listening position, the three points of the adaptive calibrator and the two direction calibrators are collinear, so that the three points of the two direction calibrators and the three points of the adaptive calibrator are collinear.

In this embodiment, as shown in fig. 5, before the calibration, three points of the TOF transmitter and the two TOF receivers form a triangle, for convenience of the following description, the two TOF receivers are respectively defined as a TOF receiver I and a TOF receiver II, the signal receiving time between the TOF receiver I and the TOF transmitter is T1, the signal receiving time between the TOF receiver II and the TOF transmitter is T2, the signal receiving time between the TOF receiver I and the TOF receiver II is regarded as d/v, where d is the distance between the TOF receiver I and the TOF receiver II, d is the length of the electric cardan shaft in this embodiment, v is the transmission speed of the TOF signal, and in the case of the calibration in the direction, |t1-t2| < d/v, in accordance with the triangle principle, |t1-t2|=d/v (representing that three points of the TOF transmitter and the two TOF receivers are collinear). That is, the time threshold is d/v.

Therefore, based on the above principle, the sound emitting direction of the speaker can be continuously adjusted through the electric universal shaft, for example, the TOF transmitter can be enabled to emit a signal once every time the direction is adjusted, so as to judge the receiving time difference in the current sound emitting direction until the receiving time difference of the two signal receiving times is equal to d/v. Referring to fig. 4, the sound emitting direction of the speaker mainly comprises an azimuth angle θ and an elevation angle Φ, so the direction calibration can be completed by continuously adjusting the azimuth angle and the elevation angle of the speaker in a mode of scanning from angle to angle.

Further, in some preferred embodiments of the present invention, since it is preferable to have two TOF receivers disposed on the rotating end of the electric cardan shaft and the other one disposed on the free end of the electric cardan shaft, the step of controlling the electric cardan shaft to adjust the sound emitting direction of the speaker according to the receiving time difference until the receiving time difference reaches the time threshold may specifically include:

step S31, the azimuth direction and the elevation direction of the electric universal shaft are controlled to rotate at will once, and a reference direction calibrator and a dynamic direction calibrator on the electric universal shaft are determined according to the change of the receiving time difference before and after rotation;

it should be understood that the TOF receiver disposed on the rotating end of the electric cardan shaft is a reference direction calibrator, and the dynamic direction calibrator disposed on the free end of the electric cardan shaft is a dynamic direction calibrator, and since the signal receiving time difference before and after the rotation of the reference direction calibrator is unchanged or changes little, and the signal receiving time difference before and after the rotation of the dynamic direction calibrator is more obvious, the reference direction calibrator and the dynamic direction calibrator on the electric cardan shaft can be determined according to the change of the receiving time difference before and after the rotation.

Step S32, determining an azimuth calibration direction and an elevation calibration direction according to the change of the corresponding signal receiving time before and after the rotation of the dynamic direction calibrator;

as shown in fig. 5, the TOF receiver I is a reference direction calibrator, and the TOF receiver II is a dynamic direction calibrator, when the electric cardan shaft rotates counterclockwise, the signal receiving time of the TOF receiver II gradually decreases and |t1—t2| tends to d/v, whereas when the electric cardan shaft rotates clockwise, the signal receiving time of the TOF receiver II gradually increases and |t1—t2| becomes smaller and smaller than d/v, and it is apparent that the counterclockwise rotation is the correct direction at this time, and thus the azimuth calibration direction and the elevation calibration direction are separately determined based on the above principle.

Step S33, controlling the electric cardan shaft to rotate step by step in the azimuth calibration direction and the elevation calibration direction (i.e. to rotate step by step in a preset angle range according to the calibration direction, for example, the elevation angle range is 0-180 °, the current 60 ° and the elevation calibration direction is the angle increasing direction, and then the step by step angle scanning can be performed in the elevation angle range of 60 ° -180 ° to complete the calibration), so as to adjust the sound emitting direction of the speaker until the receiving time difference reaches the time threshold.

It can be understood that under the condition of this embodiment, the two direction calibrators are set according to the characteristic positions, and the azimuth direction and the elevation direction of the electric universal shaft are rotated at any time during calibration, and the azimuth calibration direction and the elevation calibration direction are determined according to the corresponding change of the receiving time difference and the change of the signal receiving time before and after rotation, so that the calibration of the sounding direction of the loudspeaker can be completed directionally and rapidly. In addition, in some alternative embodiments, the adaptive calibrator may be built in the microphone, that is, when the direction calibration is specifically performed, the microphone may be placed at a predetermined listening position, and connected to the audio analysis instrument, and then the speaker may play audio while adjusting the direction, so that indexes such as an acoustic playback frequency response, a loudness balance, and the like of the speaker audio may be tested when the direction calibration is performed.

In summary, in this embodiment, the electric cardan shaft is coaxially arranged to adjust the direction of the speaker in the sound box, and at least two direction calibrators are coaxially arranged on the electric cardan shaft at intervals, so that the sound emitting direction of the speaker can be automatically calibrated according to the direction calibration signals transmitted or received by the direction calibrators, so that the sound box can reach an optimal sound emitting direction wherever being placed, the direct sound at the listening position can be increased, the room reflected sound is weakened, the mutual interference of the reflected sound and the sound wave of the direct sound at the listening position is greatly reduced, and the full-space radiation efficiency and the playback effect are greatly improved.

Example two

In another aspect, referring to fig. 6, an embodiment of the present invention is shown, where the sound system is applied to a sound room, and the sound system includes two sound boxes 10 described in the first embodiment, where the two sound boxes 10 are respectively disposed at the top corner positions of the room right in front of the predetermined listening position in the sound room, and the two sound boxes 10 are calibrated according to the method for calibrating the sound boxes described in the first embodiment in order before use, so that the connection line of the sound emitting surface of the sound box 10 (i.e., the sound emitting surface of the loudspeaker) to the center point of the loudspeaker in the sound box 10 and the center point of the predetermined listening position is also equivalent to the connection line of the sound emitting surface of the sound box 10 to the top corner of the room where the sound box 10 is located and the center point of the predetermined listening position. The sound system may be a home sound system or a cinema sound system, etc., and the predetermined listening position may specifically be an optimal listening position in the listening room. When the adapter for calibration is arranged, the adapter can be placed in the center position of the head of the user after sitting at the optimum listening position by using the bracket.

In order to further improve the effect of the sound system, acoustic decoration structures (not shown) can be arranged on six surfaces in the sound chamber to further weaken room reflection sound, control early sound reflection and proper room reverberation, and then an ideal straight and truly restored stereo sound curve which mainly consists of direct sound and is properly reverberated can be achieved after initial calibration, so that a listener can obtain stereo sound enjoyment with the most original taste. Wherein the acoustic finishing structure comprises one or more of a carpet, a curtain, a sound absorbing structure, a sound scattering decorative structure, and a diffuse reflective decorative structure.

In summary, in the sound system in the embodiment of the invention, through arranging a brand-new sound box structure capable of realizing automatic direction correction at the top corner positions of the room at the two sides right in front of the preset sound listening position, each sound box structure can always ensure that the sound outlet surface is perpendicular to the connecting line of the center of the loudspeaker and the center point of the preset sound listening position under the adaptive sound box calibration method, and the eighth space radiation theory is satisfied, so that the direct sound at the sound listening position can be increased, the room reflected sound is weakened, the mutual interference of sound waves of the reflected sound and the direct sound at the sound listening position is greatly reduced, and the total space radiation efficiency and the playback effect are greatly improved.

In addition, it should be noted that the above embodiments and the features thereof may be combined with each other according to actual needs without conflict.

The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. A sound box, characterized in that the sound box comprises:

a shell provided with at least a sound output structure;

2. The sound box according to claim 1, wherein the housing has three planes perpendicular to each other and a sound outlet surface connecting the three planes, and the sound outlet structure is disposed on the sound outlet surface.

3. The sound box of claim 2, wherein the speaker is connected to the vertical intersection of the three planes of the housing by the motorized cardan shaft.

4. The loudspeaker of claim 1, wherein the direction calibrator is a TOF transmitter or a TOF receiver.

5. The sound box according to claim 1, wherein the electric cardan shaft comprises a rotation end and a free end remote from the rotation end, the speaker is fixedly arranged at the free end, and the electric cardan shaft and the speaker rotate around the rotation end;

wherein at least one of the direction aligners is provided on the rotating end.

6. A sound system, wherein the sound system is applied in a sound room, the sound system comprising two sound boxes according to any one of claims 1 to 5, the two sound boxes being respectively arranged at the room apex angle positions on both sides of the right front of a predetermined listening position in the sound room.

7. The sound system of claim 6, wherein the sound output surface of the enclosure is perpendicular to a line connecting a center point of a speaker within the enclosure and a center point of the predetermined listening position.

8. The sound system of claim 7, wherein six sides of the sound chamber are provided with acoustic trim structures, the acoustic trim structures including one or more of carpeting, curtains, sound absorbing structures, sound scattering trim structures, and diffuse reflecting trim structures.

9. A method of calibrating a loudspeaker according to any of claims 1-5, the method comprising:

10. The method of calibrating a sound box according to claim 9, wherein the step of controlling the motorized cardan shaft to adjust the direction of the sound emission of the speaker according to the receiving time difference until the receiving time difference reaches a time threshold comprises: