TWI695632B - Audio control device and control method thereof - Google Patents

Abstract

An audio control device which is cooperated with an audio output device for outputting audio signal in a space, the audio control device comprises an image capturing device for obtaining a focal length and dimensional parameters associated with each one of a plurality target points in the space, and comprises a computing device electrically coupled to the image capturing device, for calculating an actual distance between each target point and the image capturing device based on the associated focal length, calculating a volume of the space based on the actual distances and dimensional parameters, and setting a magnitude for the audio signal from the audio output device based on the volume of the space.

Description

Audio control device and its control method

The invention relates to a control device and a control method thereof, in particular to a device and method for controlling the intensity of audio output.

In the traditional method, when adjusting the volume of the audio output device, such as the speaker of the audio, a manual adjustment method is often used. When it is turned on for the first time, or when the speaker is moved to other spaces of different sizes, it often encounters the problem of excessive or insufficient volume at the moment.

To solve the above problems, two conventional techniques have been proposed. Conventional technology one is to pre-establish a database of relevant scene information such as the size of buildings or internal spaces in various regions, and determine the location of the speakers by GPS positioning, and the database to find out the space size of the corresponding building And scene information to adjust the speaker volume. However, conventional technology 1 requires the establishment of a database of relevant scene information for all regions on the planet, and its feasibility is doubtful.

In the second conventional technique, an infrared sensor is used to measure the distance to calculate the size of the space where the speaker is located, and adjust the volume intensity of the speaker accordingly. However, the infrared sensor includes a transmitter and a receiver. If the placement of the receiver is not ideal, it will affect the quality of signal reception and reduce the accuracy of space size calculation. In addition, if a one-to-one receiver is used, to measure the size of the entire space, it must move the position of the single receiver multiple times, which is time-consuming. On the other hand, if one-to-many receivers are used and multiple receivers are placed in different positions, although time-saving can be saved, the hardware cost will be increased.

Therefore, how to provide an audio control device and a control method thereof, which can calculate the volume of the space to be measured in real time and dynamically according to a single device under the consideration of saving hardware costs, and adjust the volume accordingly, which is really Current weight One of the main topics.

In view of this, one object of the present invention is to provide an audio control device which is used in conjunction with an audio output device. The audio output device outputs audio in a space. The audio control device includes an image capturing unit and an arithmetic unit. The image capturing unit is used to obtain the focal length value and spatial parameter associated with each of the plurality of target points in the space. The computing unit is electrically connected to the image capturing unit, and is used to calculate the actual distance value between each of the target points and the image capturing unit according to the associated focal length value, according to the actual distance value and the spatial parameters The volume of the space is calculated, and the intensity of the audio output by the audio output device is set according to the volume of the space.

As described above, according to an audio control device of the present invention, the image capturing unit obtains the associated focal length value when adjusting the focal length of each of the target points to make the image in focus.

According to an audio control device of the present invention, the arithmetic unit further calculates the ratio of the volume of the space to a reference volume, and sets the intensity of the audio output by the audio output device according to the ratio.

According to an audio control device of the present invention, the arithmetic unit further compares the ratio value with a preset threshold value, and if the ratio value is greater than the preset threshold value, sets the audio output device according to the preset threshold value The intensity of the output audio.

According to an audio control device of the present invention, the arithmetic unit further divides the target points into a plurality of groups, and defines a cone with the target point of each group and the location of the image capturing unit, Calculate the volume of each cone, and add up the volume of all cones to get the volume of the space.

According to an audio control device of the present invention, the arithmetic unit further calculates the volume of each cone according to the actual distance value and spatial parameters of each of the target points.

According to an audio control device of the present invention, the spatial parameter is the coordinate value of the x-y-z rectangular coordinate system, or the coordinate value of the spherical polar coordinate system.

An audio control device according to the present invention further includes a control unit electrically connected to the image capturing unit and the arithmetic unit, for controlling the image capturing unit to rotate at various angle values to scan a predetermined trajectory, The preset trajectory covers all of the target points, so that the image capturing unit obtains the focal length value and spatial parameters associated with each of the target points.

According to an audio control device of the present invention, the preset track is an "S-shaped" track, a "Z-shaped" track, or a "spiral-shaped" track.

An object of the present invention is to provide an audio control method for controlling the intensity of output audio in a space, including aligning from a reference position to a target point on a predetermined trajectory in the space and obtaining the target The focal length value and space parameter associated with the point; calculate the actual distance value between the target point and the reference position based on the associated focal length value; adjust the angle value to align with another target on the preset trajectory in the space Point to obtain and calculate the focal length value, space parameter and actual distance value associated with the other target point; repeat the previous step to scan all target points on the preset trajectory in the space to obtain and calculate the The focal length value, space parameter and actual distance value associated with each target point; the volume of the space is calculated based on the actual distance value and the space parameter; and the intensity of the output audio is set according to the volume of the space.

As mentioned above, an audio control method according to the present invention further includes calculating the ratio of the volume of the space to a reference volume, and setting the intensity of the output audio according to the ratio.

According to an audio control method of the present invention, the method further includes comparing the ratio value with a preset threshold value, and if the ratio value is greater than the preset threshold value, setting the intensity of the output audio according to the preset threshold value.

According to an audio control method of the present invention, the target points are further divided into a plurality of groups, and a cone is defined by the position of the target point of each group and the reference position, and each cone is calculated The volume of the volume and the volume of all the cones are added to obtain the volume of the space.

An audio control method according to the present invention further includes calculating the volume of each cone according to the actual distance value and spatial parameters of each of the target points product.

According to an audio control method of the present invention, the spatial parameter is the coordinate value of the x-y-z rectangular coordinate system or the coordinate value of the spherical polar coordinate system.

1‧‧‧Audio control device

10‧‧‧Image capture unit

11‧‧‧Rotary head

20‧‧‧ arithmetic unit

30‧‧‧Control unit

31‧‧‧Motor drive circuit

32‧‧‧Motor

40‧‧‧Audio output device

41‧‧‧Amplifier

42‧‧‧speaker

o _i ‧‧‧ target

p ₀ ‧‧‧ reference position

QAD ₁ ‧‧‧ quadrilateral

QAD ₂ ‧‧‧ quadrilateral

PYR ₁ ‧‧‧Cone

PYR ₂ ‧‧‧ cone

SPC‧‧‧Partial space

S _T ‧‧‧ Audio intensity control signal

FIG. 1A is a block diagram of an audio control device 1 according to a preferred embodiment of the present invention.

FIG. 1B is a detailed block diagram of the audio control device 1 according to a preferred embodiment of the present invention.

FIGS. 2A to 2F are schematic diagrams of an image capturing device scanning a target according to a preferred embodiment of the present invention.

FIGS. 3A to 3D are schematic diagrams of defining a cone according to a preferred embodiment of the present invention.

4A to 4C are schematic diagrams of scanning trajectory forms according to other embodiments of the present invention.

FIGS. 4D to 4E are schematic diagrams of a method of defining a cone according to other embodiments of the present invention.

5A to 5B, 6 and 7 are flow charts of an audio control method according to a preferred embodiment of the present invention.

The following will explain the content of the present invention through the embodiments. The embodiments of the present invention are not intended to limit the invention to be implemented in any specific environment, application, or special manner as described in the embodiments. Therefore, the description of the embodiments is only for the purpose of explaining the present invention, not for limiting the present invention. It should be noted that, in the following embodiments and drawings, elements not directly related to the present invention have been omitted and not shown, and the dimensional relationship between the elements in the drawings is only for easy understanding and is not intended to limit the actual scale. In addition, in the following embodiments, the same elements will be described with the same element symbols.

FIG. 1A is a block diagram of an audio control device 1 according to a preferred embodiment of the present invention. Please refer to FIG. 1A. The audio control device 1 according to a preferred embodiment of the present invention includes an image capturing unit 10 , An arithmetic unit 20 and a control Unit 30. In addition, the audio control device 1 is electrically connected to an audio output device 40 and operates together with the audio output device 40.

The image capturing unit 10 can be any image capturing device with a photo or photography function and capable of autofocus, such as a digital camera or a network surveillance camera. Furthermore, FIG. 1B is a detailed block diagram of the audio control device 1 according to a preferred embodiment of the present invention, and please refer to FIG. 1B, in which the image capturing unit 10 can be disposed in a PTZ ( Pan-Tilt-Zoom) the pan-tilt head 11 can drive the image capture unit 10 to rotate in the x-direction (Pan) and y-direction (Tilt), respectively, to align a target o _{i in} space. The image capturing unit 10 captures an image of the target object o _i and obtains optical and spatial parameters related to the target object o _i , including: a focal length value f _i and a coordinate value of the target object o _i (x _i , y _i , z _i ), and the relative angle values (θ _xi , θ _yi ) of the target object o _i and the position of the image capturing unit 10. In this embodiment, the focal length value f _i can be obtained through the optical zoom adjustment process of the lens group of the image capturing unit 10 in the z direction (Zoom); or, the image included in the image capturing unit 10 can be used The digital zoom processing of the processing unit (not shown in the figure) obtains the focal length value f _i . In addition, during the rotation of the pan-tilt head 11 and the alignment of the target o _i , the coordinate values (x _i , y _i , z _i ) and relative angle values (θ _xi , θ _yi ) of the target o _i are calibrated. Then, the image capturing unit 10 transmits the parameters to the computing unit 20.

The computing unit 20 may be a central processing unit (CPU) in a personal computer, or a microprocessor (MCU) of an embedded system, or a higher-order digital signal processor (DSP). The computing unit 20 receives the parameters sent by the image capturing unit 10 and calculates them. Among them, the actual distance D _i of the target object o _i and the image capturing unit 10 is calculated according to the focal length value f _i according to the principle of optical imaging. After the calculation is completed, the arithmetic unit 20 transmits a control signal to the control unit 30, so that the control unit 30 performs a corresponding action.

Please continue to refer to FIG. 1B. The control unit 30 is mechanically connected to the pan-tilt head 11 to control the rotation of the pan-tilt head 11. In this embodiment, the control unit 30 may be a servo motor module, which includes a motor driving circuit 31 and a motor 32. In operation, in response to the control signal of the arithmetic unit 20, the motor driving circuit 31 generates a driving current to drive the motor 32, which causes the motor 32 to rotate the pan/tilt head 11 in the x direction or the y direction, so that the image capturing unit 10 is aligned with the space Another target in o _j .

Then, the image capturing unit 10 of the embodiment performs the same: to which the other object o _j captured image, and associated with the acquired object in focus value o _j f _j, coordinates (x _j, y _j, z _j ) and relative angle values (θ _xj , θ _yj ), and transfer them to the arithmetic unit 20. Next, the arithmetic unit 20 according to the focus value f _j calculated object distance D _{j j} o and the actual image capturing unit 10. After the calculation is completed, the arithmetic unit 20 sends a control signal to the control unit 30 again, causing the control unit 30 controls the rotation head 11 is rotated again, to drive the image capturing unit 10 is turned and aligned Another object space object o _k .

Then, the above steps are repeated until the image capturing unit 10 samples a sufficient number of target points in the space to be measured (the sampled target points are sufficiently meticulous and sufficient to cover the boundaries of the entire space). Then, the arithmetic unit 20 calculates the distance value {D _i }, the relative angle value {(θ _xi , θ _yi )} and the coordinate value {(x _i , y _i , z) according to all the sampled target points {o _i } _i )}, and calculate the total volume V _Total of the space to be measured. Then, the computing unit 20 calculates: a ratio R of the total volume V _Total of the space to be measured relative to a reference volume V _B (where the reference volume V _B corresponds to a reference audio intensity M _B ), and translates the ratio R A corresponding audio intensity control signal S _T (which means: audio intensity M _T ) is sent to the audio output device 40.

Please continue to refer to FIG. 1B. The audio output device 40 includes an amplifier 41 and a speaker 42. Audio amplifier 41 receives the intensity control signal S _T, and in response to the strength of the audio control signal S _T, and the output corresponding to the amplified signal to drive the speaker 42 to audio output intensity of M _T. With the above-mentioned embodiment, the intensity of the audio output from the speaker 42 can be controlled at M _T , and can be adapted to the space to be measured with the volume V _{Total to} avoid excessive or insufficient volume.

FIGS. 2A to 2F are schematic diagrams of an image capturing device scanning a target according to a preferred embodiment of the present invention. The following please refer to FIGS. 1A and 1B at the same time. First, refer to FIG. 2A. The unit 30 can control the rotation of the pan-tilt head 11 so that it drives the image capturing unit 10 to be aligned with the first target o _{1 in} the space to be measured at a starting position. Specifically, taking the origin of the xyz coordinates as a reference point, the image capturing unit 10 rotates clockwise in the x direction by an angle θ _x1 , and rotates upward in the y direction by an angle θ _y1 , thereby rotating the angle value (θ _x1 , Θ _y1 ) is the starting position, aiming at the target o ₁ , and at the same time, calibrating the coordinate value of the target o ₁ (x ₁ , y ₁ , z ₁ ). In addition, the focal length is adjusted in the z direction so that the image capturing unit 10 can capture a clear image of the target object o ₁ at a focal length value f ₁ . The image capturing unit 10 transmits the above focal length value f ₁ and coordinate value (x ₁ , y ₁ , z ₁ ) to the arithmetic unit 20.

Arithmetic unit 20 based on the focus value f _1, using the physical principle of optical imaging equation, calculated the object O ₁ with the image capture unit ₁ of the actual distance D 10. More specifically, in this embodiment, the target o ₁ is located in the direction of the rotation angle value (θ _x1 , θ _y1 ), and the image capturing unit 10 can capture the target at the furthest distance of the clearly focused image Thing. In other words, the actual distance D _{1 is} the longest distance that the image capturing unit 10 can capture in the direction of the rotation angle value (θ _x1 , θ _y1 ) to obtain a clearly focused image. The arithmetic unit 20 stores the coordinate values (x ₁ , y ₁ , z ₁ ) and the distance value D ₁ calculated above in a memory unit (not shown in the figure).

Next, as shown in FIGS. 2B to 2F, the control unit 30 can control the pan/tilt head 11 to drive the image capturing unit 10 to continue to rotate in the x direction and the y direction multiple times, so as to locate the space under test Image capture is performed on other targets o _i in the direction of different rotation angle values (θ _xi , θ _yi ). More specifically, in this embodiment, each object o _i is located in the direction of the rotation angle value (θ _xi , θ _yi ), and the image capturing unit 10 can capture the farthest distance of the focused image Target.

Wherein, as shown in FIG. 2B, the image capturing unit 10 rotates clockwise by a step angle Δθ in the x direction, and maintains the original angle in the y direction; at this time, the rotation angle value of the image capturing unit 10 (θ _x2 , Θ _y2 )=(θ _x1 +△θ, θ _y1 ). Next, as shown in FIG. 2C, the image capturing unit 10 rotates clockwise again by an angle Δθ in the x direction, and still maintains the original angle in the y direction; at this time, the rotation angle value of the image capturing unit 10 ( θ _x3 , θ _y3 )=(θ _x1 +2×Δθ, θ _y1 ).

Then, the image capturing unit 10 aligns the objects o ₂ and o ₃ at the farthest distances in the directions of the two rotation angle values, and calibrates their coordinate values (x ₂ , y ₂ , z ₂ ) and ( x ₃ ,y ₃ ,z ₃ ). In addition, the focal lengths are adjusted to focal length values f ₂ and f ₃ , respectively, to capture images of the clearly focused targets o ₂ and o _{3 respectively} . The image capturing unit 10 transmits the above focal length values f ₂ and f ₃ , and the coordinate values (x ₂ , y ₂ , z ₂ ) and (x ₃ , y ₃ , z ₃ ) to the arithmetic unit 20. The arithmetic unit 20 based on the focus value F ₂ and f _3, to calculate a target O _2, and o ₃ with the actual image capturing unit ₂ and the distance D 10 D _3, and the distance value and the coordinate value stored in the memory Body unit (not shown).

Next, as shown in FIGS. 2D to 2F, the control unit 30 controls the pan/tilt head 11 to drive the image capturing unit 10 to rotate downward in the y direction and counterclockwise to rotate in the x direction, respectively. Different rotation angle values (θ _x4 , θ _y4 ), (θ _x5 , θ _y5 ) and (θ _x6 , θ _y6 ) are taken for the objects at the longest distance o ₄ , o ₅ and o _{6 respectively} Focused image.

Among them, as shown in FIG. 2D, the image capturing unit 10 rotates downward by an angle Δθ in the y direction, and maintains the original angle in the x direction; at this time, the rotation angle value of the image capturing unit 10 (θ _x4 , θ _y4 )=(θ _x1 +2×Δθ, θ _{y1 -Δθ} ). Next, as shown in FIG. 2E, the image capturing unit 10 rotates counterclockwise by an angle Δθ in the x direction, and maintains the original angle in the y direction; at this time, the rotation angle value of the image capturing unit 10 (θ _x5 , Θ _y5 )=(θ _x1 +△θ, θ _y1 -△θ). Next, as shown in FIG. 2F, the image capturing unit 10 rotates again counterclockwise by an angle Δθ in the x direction, and still maintains the original angle in the y direction; at this time, the rotation angle value of the image capturing unit 10 ( θ _x6 , θ _y6 )=(θ _x1 , θ _y1 -△θ).

Then, the image capturing unit 10 captures images in focus for the objects o ₄ , o ₅ and o ₆ respectively, and the focal length values are f ₄ , f ₅ and f _{6 respectively} . And were calibrated out, the object o _4, o ₅ and o the coordinate value of _{6 (x 4, y 4, z} 4), (x 5, y 5, z 5) and _{(x 6, y 6, z} 6 ). The arithmetic unit 20 calculates the actual distances D ₄ , D ₅ and D ₆ of the target objects o ₄ , o ₅ and o ₆ from the image capturing unit 10 according to the above focal length values. Then, the above distance value and coordinate value are stored in the memory unit (not shown in the figure).

In particular, in another embodiment of the present invention, the coordinate value (x _i , y _i , z _i ) of the xyz rectangular coordinate system of the target object o _i can also be determined by the coordinate value of the spherical polar coordinate system (θ _xi , Θ _yi , D _i ).

According to the embodiments shown in FIGS. 2A to 2F above, and so on, the image capturing unit 10 scans along a predetermined trajectory from a starting position in the space to be measured, and targets the target on the trajectory Object o _i capture image. In this embodiment, the trajectory is a reverse "S shape"; and, in the embodiment shown in FIGS. 2A to 2F, a segment trajectory scanned by the image capturing unit 10 is the reverse The upper half of the "S shape" is shown in Figure 3A.

FIGS. 3A to 3D are schematic diagrams of defining a cone according to a preferred embodiment of the present invention, wherein, referring first to FIG. 3A, the arithmetic unit 20 is based on the six scanned The positions of the objects o ₁ to o ₆ and the position p _{0 of the} image capturing unit 10 define a plurality of cones (in this embodiment, two adjacent quadrangular pyramids may be defined). The arithmetic unit 20 can be based on the coordinate values (x ₁ , y ₁ , z ₁ ) to (x ₆ , y ₆ , z ₆ ) of each target, and its actual distance D ₁ to D ₆ from the image capturing unit 10, And the step rotation angle value Δθ of the image capturing unit 10 calculates the individual volumes of the cones.

As mentioned above, please refer to Figure 3B again, select four adjacent objects o ₁ , o ₂ , o ₅ and o ₆ , and use the quadrilateral QAD ₁ connected by their locations as the bottom surface, supplemented by Taking the position p ₀ of the image capturing unit 10 as the vertex, a quadrangular pyramid PYR ₁ can be defined. Further, the arithmetic unit 20 can calculate a quadrangle QAD length L ₁ of _a width W _1, and tetrapod PYR height H ₁ of _1, then calculate the volume V ₁ tetrapod PYR _1. among them:

H ₁ = D ₁ ×(cos△ θ ) ²

In another embodiment of the present invention, the length L ₁ and width W ₁ of the quadrilateral QAD ₁ can also be calculated using the coordinate values of the target. Where: L ₁ = y ₁ - y ₆

W ₁ = x ₂ - x ₁

Similarly, in Figure 3C, four adjacent objects o ₂ , o ₃ , o ₄ and o _{5 are selected} , and the quadrilateral QAD ₂ connected by their positions is used as the bottom surface, supplemented by image capture Taking the position p ₀ of the unit 10 as the vertex, a quadrangular pyramid PYR ₂ can be defined. Further, the arithmetic unit 20 can calculate the length L ₂ QAD quadrilateral with a width W _2, and _tetrapod-2 PYR height H _{2 2,} and then calculate the volume V ₂ PYR tetrapod _2. among them:

H ₂ = D ₂ ×(cos△ θ ) ²

In another embodiment of the invention, the length L ₂ and width W ₂ of the quadrilateral QAD ₂ can also be calculated using the coordinate values of the target. Where: L ₂ = y ₂ - y ₅

W ₂ = x ₃ - x ₂

Then, the arithmetic unit 20 adds the volumes V ₁ and V _{2 of} the two quadrangular pyramids, and the resulting total volume V _Total is equal to: as shown in FIG. 3D, the total volume of the partial space SPC. Wherein, the partial space SPC is defined by the scanned segment trajectory defining a bottom surface, supplemented by the position p ₀ where the image capturing unit 10 is located as a vertex.

FIGS. 4A to 4C are schematic diagrams of scanning trajectory forms according to other embodiments of the present invention. As described above, and referring first to FIG. 4A, in this embodiment, the control unit 30 can further control the rotating cloud The table 11 drives the image capturing unit 10 to further rotate, so that the trajectory scanned by the image capturing unit 10 can cover all boundaries of the entire space to be measured. (Among them, the image capturing unit 10 takes a rotation angle Δθ as the step diameter, and scans all the objects o _i on the track).

Similarly, then, select four adjacent objects o _i on the trajectory, connect them into a bottom surface, supplemented by the position p ₀ of the image capturing unit 10 as the vertex, and define a cone, and then calculate Unit 20 calculates the volume of the cone. Next, select four other adjacent objects in sequence to define another bottom surface, supplemented by p ₀ as a vertex, and define another cone. Repeat the above embodiment to define all the cones and calculate the volume V _{i of the} individual cones. Finally, the volumes V _{i of} all the cones are added, and the total volume V _Total obtained is the total volume of the entire space to be measured.

That is to say, in Figure 4A, when the scanning trajectory covers all boundaries of the entire space to be measured, the target o _i on the trajectory also spreads over all boundaries of the entire space to be measured. Therefore, all the defined cones fill up the entire space to be measured; in other words, the partial space SPC shown in FIG. 3D expands to the entire space to be measured. At this time, the total volume of all cones, V _Total , is the total volume of the entire space to be measured.

The present invention is not limited to scanning the space to be measured with "S-shaped"trajectories; the control unit 30 can also control the image capturing unit 10 to rotate in other ways so that it can scan with other types of trajectories, as long as these types of scanning trajectories are sufficient Covering all the boundaries of the entire space to be measured, and the scanning trajectory is sufficiently meticulous (the sampling density of the target object o _i on the trajectory is sufficient) can be used. As shown in FIG. 4B, in another embodiment of the present invention, the image capturing unit 10 may use a "Z-shaped" scanning trajectory. In addition, as shown in FIG. 4C, in still another embodiment of the present invention, the image capturing unit 10 may use a “spiral” scanning trajectory.

FIGS. 4D to 4E are schematic diagrams of a method of defining a cone according to other embodiments of the present invention. As shown in FIGS. 4D to 4E, the present invention is not limited to: selecting four adjacent objects o _i on the track to form a bottom surface, and defining a quadrangular pyramid as a unit. Among them, as shown in FIG. 4D, in another embodiment of the present invention, three adjacent objects o _i on the trajectory can also be selected, connected as a triangle as the bottom surface, and a triangular pyramid is defined as the volume calculation unit. In addition, in other embodiments of the present invention, adjacent N targets o _i on the trajectory can also be selected, connected as a polygon (where N>4) as the bottom surface, and a polygonal pyramid is defined as the volume calculation unit . For example, as shown in Fig. 4E, six adjacent objects o _i on the trajectory can be selected, the line is formed into a hexagon as the bottom surface, and a hexagonal cone is defined as a unit.

In addition, the volume of the volume to be measured by the present invention is not limited to a closed space with a boundary. In other embodiments of the present invention, the volume of the open space can also be calculated. Since the open space does not have a clear boundary, in this embodiment, the image capturing device does not scan the physical target on the boundary; in this embodiment, the image capturing unit 10 is in the direction of each rotation angle value On the above, adjust the focal length value f _i to achieve the maximum depth of field, and capture the clearest image at the farthest distance. In other words, the image capturing unit 10 does not capture an image of a solid target, but pulls the focal length value f _i to the maximum depth of field in the direction of the rotation angle value. Then, the arithmetic unit 20 based on this focus value f _i is calculated the maximum distance D _i, D _i and in that the distance a defined setpoint p _i, p _i and the anchor point is set to a virtual object o _i, for Embodiments shown in FIGS. 2A to 2F, FIGS. 3A to 3D, and FIGS. 4A to 4E.

After the computing unit 20 calculates the total volume V _Total of the space to be measured, the total volume V _{Total is} converted into a proportional value R based on a preset reference volume V _B , where:

Since the reference volume V _B corresponds to a reference audio intensity M _B ; therefore, according to the proportional value R, it can be translated (for example, by means of a lookup table) into a corresponding audio intensity control signal S _T , which represents the audio intensity M _T . Wherein, the audio intensity M _T corresponds to the total volume V _Total . Then, the arithmetic unit 20 controls the intensity of the audio signal s _T transmitted to the amplifier 41 of the audio output device 40, the amplification of the signal corresponding to the output of the amplifier 41 to drive the audio speaker 42 of the output intensity of M _T.

In another embodiment of the present invention, an intensity upper limit value may be set to limit the audio intensity output by the speaker 42 within the upper limit value, so as to protect the speaker 42 from damage due to excessive output intensity. In this embodiment, a predetermined threshold value R _{max is set} , which corresponds to the maximum audio intensity M _{max that the} speaker 42 can withstand. After calculating the total volume V _Total of the space to be measured and its proportional value R with respect to the preset reference volume V _B, the arithmetic unit 20 compares the proportional value R with the preset critical value R _max . If the ratio R is less than the predetermined threshold value R _max, it represents the intensity of the audio corresponding to the ratio value R M _T are within the scope of the speaker 42 can withstand; output from the speaker 42 the audio driver with audio intensity of M _T. Conversely, if the ratio value R is greater than or equal to a preset threshold value R _max, it indicates that the value of ratio R M _T corresponding to the audio strength able to withstand more than the range of the loudspeaker 42; in this case, corresponds to a preset threshold value R _max, to The speaker 42 is driven to output audio with an audio intensity M _max to protect the speaker 42 from damage.

5A to 5B, 6 and 7 are flow charts of an audio control method according to a preferred embodiment of the present invention. First, please refer to FIG. 5A. In step 501, the initial rotation angle value (θ _x1 , θ _y1 ) relative to the origin of the xyz coordinate is aligned from the reference position p _{0 in} the space to be measured. The first target o ₁ , and capture an image of the first target o ₁ . And adjust the focal length to the focal length value f ₁ to get a clear focus image. Wherein, the first target object o ₁ is located at the starting position of a predetermined scanning track.

Next, in step 502, the coordinate value (x ₁ , y ₁ , z ₁ ) of the first target object o _{1 is} calibrated. And, based on the focal length value f ₁ adjusted in step 501, the actual distance D _{1 of the} first target object o ₁ and the reference position p ₀ is calculated. In addition, the above coordinate values (x ₁ , y ₁ , z ₁ ) and the distance value D _{1 are} stored.

Next, in step 503, the step angle Δθ is incremented along the x direction to adjust the rotation angle value to (θ _x1 + Δθ, θ _y1 ), while aligning with another target in the space to be measured o ₂ . In addition, the focal length is adjusted to a focal length value f ₂ to obtain a clearly focused image of the target o ₂ . Wherein, the target object o ₂ is located at the second position of the preset scanning trajectory.

Next, in step 504, the coordinate value (x ₂ , y ₂ , z ₂ ) of the second target object o _{2 is} calibrated. And, based on the focal length value f ₂ adjusted in step 503, the actual distance D _{2 of the} second target object o ₂ and the reference position p ₀ is calculated. In addition, the above coordinate values (x ₂ , y ₂ , z ₂ ) and the distance value D _{2 are} stored.

Next, in step 505, it is determined whether the value of the rotation angle adjusted incrementally in the x direction has reached the maximum value of the right angle of rotation in the x direction.

If the maximum angle value that can be rotated to the right in the x direction is not reached, return to step 503 and continue to increase the step angle Δθ in the x direction to adjust the rotation angle value to (θ _x1 +2×Δθ, θ _y1 ) While aiming at another target o _{3 in} the space to be measured. In addition, the focal length is adjusted to a focal length value f ₃ to obtain a clearly focused image of the target o ₃ . Then, in step 504, the coordinate value (x ₃ , y ₃ , z ₃ ) of the target object o ₃ is calibrated, and the actual distance D _{3 of the} target object o ₃ is calculated.

If the maximum angle of rotation in the x direction to the right has been reached, in step 506, a step angle Δθ is increased (or decreased) along the other coordinate axis. For example: if the maximum angle value θ _x1 +N _max ×Δθ that can be rotated to the right in the x direction has been reached, then reduce the step angle Δθ in the y direction to adjust the rotation angle value to (θ _x1 +N _max × △θ, θ _y1 -△θ), and aim at the target in the direction of the rotation angle value in the space to be measured. Also, adjust the focal length to get a clear image of the target. Then, in step 507, the coordinate value of the target is calibrated, and the actual distance of the target is calculated.

After completing step 507, next, in step 508, reverse rotation is performed along the same coordinate axis as in step 503, with the step angle Δθ as the unit. For example: decrease the step angle Δθ in the x direction, adjust the rotation angle value to (θ _x1 +(N _max -1)×Δθ, θ _{y1 -Δθ} ), and align it in the space to be measured The target in the direction of the rotation angle value. Also, adjust the focal length to get a clear image of the target. Then, in step 509, the coordinate value of the target object is calibrated, and the actual distance of the target object is calculated.

Next, in step 510, it is determined whether the value of the rotation angle adjusted by decreasing in the x direction reaches the maximum value of the left angle of the x direction that can be rotated to the left.

If the maximum angle of rotation to the left in the x direction is not reached, return to step 508 and continue to decrease the step angle Δθ in the x direction to adjust the rotation angle value to (θ _x1 +(N _max -2)× △θ, θ _y1 -△θ), and aim at the target in the direction of the rotation angle value in the space to be measured. Also, adjust the focal length to get a clear image of the target. Then, in step 509, the coordinate value of the target object is calibrated, and the actual distance of the target object is calculated.

If the maximum angle of rotation to the left in the x direction has been reached, in step 511, a step angle Δθ is increased (or decreased) along the other coordinate axis. For example, if it has returned to the initial angle value θ _{x1 of the} x-axis, then reduce the step angle Δθ in the y direction to adjust the rotation angle value to (θ _x1 , θ _y1 -2×Δθ), and align The target in the direction of the rotation angle value in the space to be measured. Also, adjust the focal length to get a clear image of the target. Then, in step 512, the coordinate value of the target object is calibrated, and the actual distance of the target object is calculated according to the focal length value.

Next, in step 513, it is determined whether the value of the rotation angle adjusted by decreasing in the y direction reaches the maximum value of the angle of rotation downward in the y direction.

If it does not reach the maximum value of the downward rotatable angle in the y direction, return to step 503 and continue to increase the step angle Δθ in the x direction to adjust the rotation angle value to (θ _x1 +Δθ, θ _y1 -2 ×△θ). Then, repeat steps 504 to 512.

If the maximum angle value that can be rotated downward in the y direction has been reached (for example: θ _y1 -N _max ×Δθ), it means that the entire preset trajectory has been scanned.

In particular, in this embodiment, steps 501 to 513 scan the "S-shaped" trajectory, but the invention is not limited to this. In other embodiments of the present invention, other forms of scanning trajectories may also be used, for example, "Z-shaped" trajectories or "spiral-shaped" trajectories may be used.

After all the objects o _i on the preset trajectory are scanned, next, steps 601 to 605 are performed to further calculate the total volume of the space to be measured. Referring to FIG. 6, in step 601, all the objects {o _i } located on the trajectory scanned in steps 501 to 513 are divided into a plurality of groups. Each group contains four adjacent objects o _j . In particular, in this embodiment, all target objects {o _i } are divided equally, so that each group contains the same number of target objects o _j . However, the present invention is not limited thereto; In other embodiments of the present invention, the method can also be employed to distinguish between varying points, so that each object group contains the number o different from _j.

Next, in step 602, for each group, within the group, four included objects o _{j are} connected to form a quadrilateral, and the quadrilateral is used as the bottom surface, supplemented by the reference position p ₀ For the vertex, define a quadrangular pyramid.

Next, in step 603, according to the actual distance D _j and the coordinate value (x _j , y _j , z _j ) of each of the four target objects o _j , and in step 503, step 506, step 508, and step 511 The step angle value Δθ can calculate the length L and width W of the quadrilateral and the height H of the quadrangular pyramid. And then calculate the volume V of the pyramid.

Next, in step 604, it is determined whether all groups have been Performed, such as the actions in steps 602 and 603; defining the pyramid and calculating the volume V of the pyramid.

If all the groups have not been executed, return to step 602 to define a quadrangular pyramid for the target point of another group that has not been executed; and to step 603, calculate the volume V of the quadrangular pyramid.

If all groups have been executed, next, in step 605, the volume V of all the pyramids is added to obtain a total volume, which is the total volume V _{Total of} the space to be measured.

In particular, in this embodiment, each group includes four targets, and the line becomes a quadrilateral bottom. However, the present invention is not limited to this. In other embodiments of the present invention, each group may also include other numbers of targets. For example, each group may include three targets, and the line becomes the base of a triangle, which in turn defines a triangle cone. For another example, each group may include six targets, and the line becomes a hexagonal bottom surface, and then a hexagonal cone is defined.

After the calculation of the total volume of the space V _Total tested, Next, step 701 to 706 to output audio corresponding to the audio of the total volume V _Total intensity of M _T.

Please refer to FIG. 7, in step 701, first, a preset reference volume V _{B is set} , which corresponds to a reference audio intensity M _B.

Next, in step 702, a ratio R of the total volume V _{Total of} the space to be measured with respect to the preset reference volume V _B is calculated. Among them, R=V _Total /V _B

In this embodiment, a look-up table (LUT) can be created in advance, which includes the correspondence between different ratio values and audio intensity. In addition, the audio intensity M _T corresponding to the ratio R can be found by looking up the table.

Next, in step 703, a predetermined threshold value R _{max is set} , which corresponds to a maximum audio intensity M _max . Wherein, the maximum audio intensity M _max is the maximum intensity that the speaker can bear. Then, compare the ratio R with the preset threshold R _max .

Next, in step 704, the comparison result is determined. If the ratio R is greater than or equal to the predetermined threshold R _max , then in step 705, the audio with the audio intensity M _{max is} output to protect the speaker from damage.

If the proportional value R is less than the preset critical value R _max , then in step 706, the audio with the audio intensity M _{T is} output to be suitable for the space to be measured with the total volume V _Total .

This invention meets the requirements of the invention patent, and the patent application is filed in accordance with the law. However, the above are only the preferred embodiments of the present invention, and thus cannot limit the scope of patent application in this case. Anyone who is familiar with the skills of this case and equivalent modifications or changes made in accordance with the spirit of the invention of this case should be included in the scope of the following patent applications.

10‧‧‧Image capture unit

11‧‧‧Rotary head

20‧‧‧ arithmetic unit

30‧‧‧Control unit

31‧‧‧Motor drive circuit

32‧‧‧Motor

40‧‧‧Audio output device

41‧‧‧Amplifier

42‧‧‧speaker

o _i ‧‧‧ target

S _T ‧‧‧ Audio intensity control signal

Claims (15)

An audio control device is used in conjunction with an audio output device that outputs audio in a space. The audio control device includes: an image capture unit for obtaining a plurality of target points in the space A focal length value and a spatial parameter associated with one; and an arithmetic unit electrically connected to the image capturing unit for calculating each of the target points and the image capturing unit according to the associated focal length value The actual distance value, calculate the volume of the space based on the actual distance values and the space parameters, and set the intensity of the audio output by the audio output device according to the volume of the space; wherein the arithmetic unit defines the space as Plural cones, and the volume of each of the cones is added to obtain the volume of the space. As in the audio control device of claim 1, wherein the image capturing unit obtains its associated focal length value when adjusting the focal length of each of the target points to make the image in focus. As in the audio control device of claim 1, wherein the arithmetic unit further calculates the ratio of the volume of the space to a reference volume, and sets the intensity of the audio output by the audio output device according to the ratio. As in the audio control device of claim 3, wherein the arithmetic unit further compares the proportional value with a preset threshold value, if the proportional value is greater than the preset threshold value, the audio output device is set according to the preset threshold value The intensity of the output audio. Such as the audio control device of claim 3, wherein the arithmetic unit further divides the target points into a plurality of groups, and defines the target points of each group and the location of the image capturing unit as the cone-shaped For one of the volumes, calculate the volume of each of the cones, and add up the volume of all the cones to obtain the volume of the space. As in the audio control device of claim 5, wherein the arithmetic unit further calculates the volume of each cone according to the actual distance value and spatial parameters of each of the target points. As in the audio control device of claim 6, the spatial parameter is the coordinate value of the x-y-z rectangular coordinate system, or the coordinate value of the spherical polar coordinate system. The audio control device according to claim 1 further includes: a control unit electrically connected to the image capturing unit and the arithmetic unit, for controlling the image capturing unit to rotate at various angle values to scan a preset trajectory , The preset trajectory covers all of the target points, so that the image capturing unit obtains the focal length value and spatial parameters associated with each of the target points. The audio control device according to claim 8, wherein the preset trajectory is an S-shaped trajectory, a Z-shaped trajectory, or a spiral trajectory. An audio control method for controlling the intensity of output audio in a space, including: aligning a target point on a preset trajectory in the space from a reference position, and obtaining the focal length value associated with the target point and Spatial parameters; calculate the actual distance between the target point and the reference position according to the associated focal length value; adjust the angle value and align it with another target point on the preset trajectory in the space to obtain and calculate The focal length value, spatial parameter and actual distance value associated with the other target point; repeat the previous step to scan all target points on the preset trajectory in the space to obtain and calculate each of these target points The associated focal length value, spatial parameter and actual distance value; define the spatial division as a plurality of cones; calculate the volume of each of the cones based on the actual distance values and spatial parameters; The volume of each of the cones is added to obtain the volume of the space; and the intensity of the output audio is set according to the volume of the space. The audio control method of claim 10 further includes: calculating the ratio of the volume of the space to a reference volume, and setting the intensity of the output audio according to the ratio. For example, the audio control method of claim 11 further includes: comparing the ratio value with a preset threshold value, and if the ratio value is greater than the preset threshold value, setting the intensity of the output audio according to the preset threshold value. For example, the audio control method of claim 11 further includes: dividing the target points into a plurality of groups, and defining the position of the target point of each group and the reference position as one of the cones Then, calculate the volume of each of the cones, and add up the volume of all the cones to get the volume of the space. The audio control method according to claim 13 further includes: calculating the volume of each cone according to the actual distance value and spatial parameters of each of the target points. For example, the audio control method of claim 14, wherein the spatial parameter is the coordinate value of the x-y-z rectangular coordinate system, or the coordinate value of the spherical polar coordinate system.

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