Sound output device, electronic whiteboard, sound output system, sound output control method, and program

Abstract

To appropriately change the volume of a plurality of acoustic devices in a sound output device to which the acoustic devices are connected.SOLUTION: In an electronic blackboard 2, a sound output device 20 comprises: a first control unit 301 to which a first speaker SP 1 being a first acoustic device is connected and outputs a sound based on sound output data 303 from the first speaker SP1 based on a first volume value SD1; and a second control unit 302 to which a second speaker SP2 being a second acoustic device is connected and has an amplifier that amplifies a sound output from the second speaker SP2, outputs a sound based on the sound output data 303 transmitted from the first control unit 301 from the second speaker SP2 based on the first volume value SD1 transmitted from the first control unit 301, and performs control of fixing a second volume value SD2 that is set to the amplifier.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a sound output device, an electronic whiteboard, a sound output system, a sound output control method, and a program. [Background technology]

[0002] 2. Description of the Related Art Conventionally, a configuration is known in which a speaker is connected to an electronic whiteboard or the like and sound output is controlled by a remote control or the like.

[0003] For example, in a configuration in which an audio device is connected to a host device via USB (Universal Serial Bus), a technique is known in which an instruction value from the host device is compared with a setting value set in a volume control unit, and volume synchronization processing is performed based on the comparison result (see, for example, Patent Document 1). Summary of the Invention [Problem to be solved by the invention]

[0004] However, in a sound output device to which multiple audio devices such as speakers or sound-related peripheral devices are connected, there are cases where it is not possible to appropriately change the volume of any of the audio devices because information exists regarding the volume of each audio device.

[0005] An aspect of the present invention aims to appropriately change the volume of a plurality of audio devices in a sound output device to which the plurality of audio devices are connected. [Means for solving the problem]

[0006] According to one embodiment of the present invention, a sound output device comprises: a first control unit to which a first audio device is connected and which outputs a sound based on sound output data from the first audio device in accordance with first volume data; a second control unit to which a second acoustic device is connected and which has an amplifier unit that amplifies sound output from the second acoustic device, outputs sound based on the sound output data transmitted from the first control unit from the second acoustic device based on the first volume data transmitted from the first control unit, and controls to fix the second volume data set for the amplifier unit; 、 an operation unit for changing the first volume data; Equipped with The second control unit is accepting an operation to change the first volume data by the operation unit; performing control to fix the second volume data; The first control unit is receiving an operation result from the operation via the second control unit; The first volume data is changed based on the operation result. [Effects of the Invention]

[0007] According to the embodiment of the present invention, in a sound output device to which a plurality of sound devices are connected, the volume of each sound device can be appropriately changed. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 10 is a diagram illustrating an example of use of an electronic whiteboard. [Figure 2] FIG. 2 is a diagram illustrating an example of a hardware configuration of an electronic whiteboard. [Figure 3] FIG. 2 is a diagram illustrating an example of a functional configuration. [Figure 4] FIG. 1 is a diagram illustrating a first connection configuration example. [Figure 5] FIG. 10 is a diagram illustrating a second connection configuration example. [Figure 6] FIG. 10 is a diagram illustrating an example of operation. [Figure 7] FIG. 10 is a diagram illustrating an example of overall processing. [Figure 8] FIG. [Figure 9] FIG. 10 is a diagram showing an example of operation in a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0009] The optimum and minimum mode for carrying out the invention will be described below with reference to the drawings. Note that in the drawings, when the same reference numerals are used, it indicates that the same configuration is present, and redundant explanations will be omitted. Furthermore, the specific examples shown in the drawings are merely examples, and the configuration may further include configurations other than those shown in the drawings.

[0010] First Embodiment The following description will be given taking an example of an electronic whiteboard having a sound output device.

[0011] 1 is a diagram showing an example of how to use an electronic whiteboard. To simplify the explanation, the following will be described using an example in which two electronic whiteboards, 2a and 2b, and accompanying electronic pens 4a and 4b, are used. Therefore, three or more electronic whiteboards or electronic pens may be used, or a single electronic whiteboard may be used.

[0012] The image processing system 1 includes information processing devices such as a plurality of electronic whiteboards 2a and 2b, a plurality of electronic pens 4a and 4b, USB memories 5a and 5b, notebook PCs (Personal Computers) 6a and 6b, video conference terminals 7a and 7b, a PC 8, and a server 11.

[0013] The electronic whiteboards 2a, 2b, PC 8, and server 11 are communicatively connected via a communication network 9. Furthermore, the electronic whiteboards 2a, 2b are provided with displays 3a, 3b, respectively.

[0014] In addition, the electronic whiteboard 2a displays on the display 3a an image drawn by an event caused by the electronic pen 4a (for example, an operation such as touching the display 3a with the tip or the butt of the electronic pen 4a).

[0015] The electronic whiteboard 2a changes the image displayed on the display 3a based on events (for example, gestures such as zooming in, zooming out, or turning a page) generated not only by the electronic pen 4a but also by the user's hand Ha or the like.

[0016] A USB memory 5a can be connected to the electronic whiteboard 2a, and the electronic whiteboard 2a can read electronic files such as PDF files from the USB memory 5a or store electronic files in the USB memory 5a.

[0017] The electronic whiteboard 2a has connectors conforming to standards such as DisplayPort, DVI (Digital Visual Interface), HDMI (High-Definition Multimedia Interface), and VGA (Video Graphics Array). Therefore, the notebook PC 6a is connected to the electronic whiteboard 2a via a cable 10a1.

[0018] When an event such as a touch on the display 3a occurs, the electronic whiteboard 2a transmits event information indicating the content of the event to the notebook PC 6a. Similarly, a video conference terminal 7a (sometimes called a "video conference terminal") is connected to the electronic whiteboard 2a via a cable 10a2 that enables communication according to a standard.

[0019] The notebook PC 6a and the video conference terminal 7a may communicate with the electronic whiteboard 2a via wireless communication conforming to a wireless communication protocol such as Bluetooth (registered trademark).

[0020] Meanwhile, at other locations where the electronic whiteboard 2b is installed, the electronic whiteboard 2b equipped with the display 3b, the electronic pen 4b, the USB memory 5b, the notebook PC 6b, the video conference terminal 7b, the cable 10b1, and the cable 10b2 are used, similar to the electronic whiteboard 2a. Furthermore, based on an event caused by the user's hand Hb or the like, the electronic whiteboard 2b changes the image displayed on the display 3b.

[0021] The server 11 manages the communication between the bases via the communication network 9 as described above. For example, the server 11 manages the connection between the electronic whiteboards 2a and 2b via the communication network 9. The management of the connection between the electronic whiteboards 2a and 2b may be initiated in response to a connection request to the server 11 from at least one of the electronic whiteboards 2a and 2b. By having the server 11 manage the communication between various devices connected to the communication network 9, for example, the server 11 can manage the communication between devices or between bases according to the devices, such as the multiple electronic whiteboards 2, connected to the communication network 9.

[0022] In this way, an image drawn on the display 3a of the electronic whiteboard 2a at one location is displayed on the display 3b of the electronic whiteboard 2b at another location. Conversely, an image drawn on the display 3b of the electronic whiteboard 2b at another location is displayed on the display 3a of the electronic whiteboard 2a at one location.

[0023] In this way, the image processing system 1 performs remote sharing processing for sharing the same image at remote locations, which is convenient when used for a conference or the like at remote locations.

[0024] <Terminology> In the following examples, any one of the multiple electronic whiteboards will be referred to as "electronic whiteboard 2."

[0025] When referring to any one of the multiple displays, it is referred to as "Display 3."

[0026] When referring to any one of the multiple electronic pens, it will be referred to as "electronic pen 4."

[0027] When referring to any one of multiple USB memory sticks, it is referred to as "USB memory stick 5."

[0028] When referring to any one of multiple notebook PCs, it is referred to as "notebook PC 6."

[0029] When referring to any one of the multiple video conference terminals, it is referred to as "video conference terminal 7."

[0030] When referring to any hand among multiple users' hands, it is referred to as "hand H."

[0031] When referring to an arbitrary cable among multiple cables, it will be referred to as "cable 10."

[0032] In the following description, an example in which an electronic whiteboard has a sound output device will be described, but the device having the sound output device may be other than an electronic whiteboard.

[0033] For example, the sound output device may be included in a telestrator used in electronic signage (digital signage), sports, or weather forecasts, or in a remote image (video) diagnostic device.

[0034] In the following description, an example will be given in which the information processing terminal is a notebook PC 6. However, the information processing terminal is not limited to this. For example, the information processing terminal may be a terminal capable of supplying image frames, such as a desktop PC, a tablet PC, a PDA, a digital video camera, a digital camera, or a game console.

[0035] The communication network 9 includes the Internet, a LAN (Local Area Network), a mobile phone communication network, etc. To enhance security, the communication network 9 may be connected to the Internet using a VPN (Virtual Private Network).

[0036] In the following description, an example will be described in which the recording medium is a USB memory. However, the recording medium is not limited to this. For example, the recording medium may be another type of recording medium, such as an SD (registered trademark) card.

[0037] An image showing characters, figures, numbers, symbols, lines, or a combination thereof that a user writes by hand on an electronic whiteboard is called a "stroke image."

[0038] <Example of hardware configuration for an electronic whiteboard> An example of the hardware configuration of the electronic whiteboard of this embodiment will be described below.

[0039] 2 is a diagram showing an example of the hardware configuration of an electronic whiteboard 2. For example, the electronic whiteboard 2 has hardware such as a controller 21, a control board 22, a power supply 23, and a touch panel 24.

[0040] The controller 21 has a configuration including a CPU (Central Processing Unit), which is an example of a control device and a calculation device, a storage device, etc. Also, the controller 21 is connected to a first speaker SP1, which is an example of a first acoustic device.

[0041] The control board 22 has an amplifier 221, a remote control receiver 222, and a main body key 223. In addition to the first speaker SP1, a second speaker SP2, which is an example of a second acoustic device, is connected to the control board 22.

[0042] The power supply 23 supplies power to the controller 21 and the control board 22 .

[0043] The touch panel 24 is an example of an output device that displays processing results to the user and an input device that accepts operations from the user.

[0044] The first speaker SP1 is, for example, an external speaker connected via a USB (Universal Serial Bus) Audio Class or the like. As shown in the figure, the first speaker SP1 is connected to the controller 21. Furthermore, an audio amplifier for the first speaker SP1 is, for example, built into the first speaker SP1.

[0045] The second speaker SP2 is a speaker connected via an audio output terminal of the interactive whiteboard 2. For example, if the second speaker SP2 is a passive speaker, it can be controlled by the amplifier 221 built into the interactive whiteboard 2. If the second speaker SP2 is an active speaker, an amplifier is also installed on the external speaker side. Therefore, the volume can be adjusted by adjusting the amplifier installed on the external speaker side. For example, if the second speaker SP2 is connected via Line Out, the volume value will be constant. On the other hand, if the second speaker SP2 is connected via HeadPhone Out, it can be controlled by the amplifier 221 built into the interactive whiteboard 2.

[0046] For example, the operation unit is realized by a remote control receiver 222 and a remote control 224. The operation unit may also be realized by main body keys 223, for example.

[0047] The remote control receiver 222 is a device that accepts operations from a remote control 224 .

[0048] The main body key 223 is a device that accepts operations by buttons or the like.

[0049] For example, the user performs various operations, including changing the volume value, using the remote control 224 or the main body keys 223.

[0050] <Example of functional configuration> Fig. 3 is a diagram showing an example of the functional configuration of the interactive whiteboard 2 shown in Fig. 2. The interactive whiteboard 2 has the function of an information processing device that executes information processing, as well as the function of a sound output device 20 that controls sound output. The interactive whiteboard 2, which has the information processing device and the sound output device 20, operates as a sound output system. For example, the sound output device 20 has a functional configuration including a first control unit 301 and a second control unit 302.

[0051] The first control unit 301 is realized by, for example, the controller 21. The second control unit 302 is realized by the control board 22.

[0052] The following description will be given on the case where the first control unit 301 manages the sound output data 303.

[0053] The sound output data 303 is, for example, electronic data that can be stored in a computer system and that can be used to play sound. The sound output data 303 may be sound data only, or may also include video information. Specifically, in the present invention, various file formats such as MP3 (MPEG Audio Layer-3), MP4 (MPEG Audio Layer-4), WAV (Waveform Audio Format), or AVI (Audio Video Interleave) can be applied to the sound output data 303.

[0054] An example of the first volume data managed by the first control unit 301 is referred to as a "first volume value SD1." On the other hand, an example of the second volume data managed by the second control unit 302 is referred to as a "second volume value SD2."

[0055] As shown in the figure, the first audio device and the second audio device have different connection destinations.

[0056] The sound device in the interactive whiteboard 2 has a connection configuration such as the first or second connection configuration example shown below.

[0057] <First connection configuration example> 4 is a diagram showing a first connection configuration example, in which the controller 21 and the control board 22 are connected by two control lines: a first control line LN1 and a second control line LN2.

[0058] The first control line LN1 is a control line through which the controller 21 transmits data used for control to the control board 22. As shown in the figure, on the first control line LN1, the flow of data, control, etc. is unidirectional from the controller 21 to the control board 22.

[0059] The second control line LN2 is constructed by connecting the controller 21 and the control board 22 with a USB device. With such a second control line LN2, the control board 22 can receive the operation results from an operation performed with the remote control 224 or the like and send the operation results to the controller 21.

[0060] The operation using the remote control 224 or the main body keys 223 is, for example, an operation to turn the volume up, turn the volume down, or switch mute "ON / OFF."

[0061] The second control line LN2 is realized by, for example, a USB HID (Human Interface Device) class.

[0062] The controller 21 has an OS (Operating System). That is, software for constructing the OS is pre-installed in the controller 21. Therefore, the OS can transmit sound output data 303 and a first volume value SD1 to the control board 22 via the first control line LN1. That is, the OS can control the second speaker SP2 to output sound based on the sound output data 303 via the first control line LN1. Furthermore, the volume value is controlled by the first volume value SD1.

[0063] On the other hand, when the control board 22 receives an operation result to change the volume value, it sends the operation result via the second control line LN2 to the controller 21. Therefore, the first volume value SD1 can be operated based on the operation result received by the control board 22.

[0064] Furthermore, the control board 22 fixes the second volume value SD2. The volume value of the second speaker SP2 is controlled by the first volume value SD1. The first volume value SD1 is also changed by an operation to change the volume value. With this configuration, when the volume value is changed by operating the remote control 224, etc., it is possible to control the change of the volume value of the sound output from both the first speaker SP1 and the second speaker SP2.

[0065] The OS may be installed on the control board 22. That is, not only the first control unit but also the second control unit may have an OS.

[0066] The first and second control units may have different types of OS. For example, the first control unit may have Windows (registered trademark), and the second control unit may have Android (registered trademark).

[0067] <Second connection configuration example> 5 is a diagram showing a second connection configuration example. Compared to the first connection configuration, this differs in that the controller 21 has a remote control receiver 222 and a main unit key 223. However, like the first connection configuration example, an OS is built into the controller 21. Therefore, in the second connection configuration example, when an operation to change the volume value is performed on the remote control 224, the first volume value SD1 is changed. On the other hand, the second volume value SD2 is fixed.

[0068] In this way, both the first speaker SP1 and the second speaker SP2 output sound based on the first volume value SD1. With this connection configuration, when the volume value is changed by operating the remote control 224, it is possible to control the volume value of the sound output from both the first speaker SP1 and the second speaker SP2.

[0069] As in the first connection configuration example, the control board 22 may have the remote control receiver 222 and the main body keys 223. In other words, it is sufficient that the configuration allows the operation results to be sent to the controller 21 no matter where they are received.

[0070] <Operation example> In a configuration such as the first or second connection configuration example, when an operation to change the volume value (hereinafter referred to as a "volume operation SC") is performed, the volume value is changed as follows.

[0071] 6 is a diagram showing an example of operation. As shown in the figure, when a volume operation SC is performed using the remote control 224 or the like, the first volume value SD1 is changed. In this way, control is performed so that sound is output from both the first speaker SP1 and the second speaker SP2 based on the operated first volume value SD1.

[0072] On the other hand, the second volume value SD2 is fixed, that is, the volume values for both the first speaker SP1 and the second speaker SP2 are changed by manipulating the first volume value SD1.

[0073] In this configuration, the sound source output by the first speaker SP1 and the second speaker SP2 is the sound output data 303. In this way, the sound output data 303 and the first volume value SD1 are used as the sound source, and the content and volume of the sound to be output are determined.

[0074] The external speaker and the USB speaker may be equipped with an amplifier. When the first volume value SD1 is changed, the volume value of the USB speaker can be changed synchronously. Also, the volume value of the external speaker can be changed when the first volume value SD1, which is the sound source, is changed. Therefore, both the first speaker SP1 and the second speaker SP2 in this example can be operated.

[0075] <Overall processing example> 7 is a diagram showing an example of the overall process. For example, when an operation is performed using the remote control 224 or the main body keys 223, the overall process is executed.

[0076] (Example of determining whether a controller is present) (Step S1) It is desirable that the controller 21 has a structure that allows it to be physically removed. Alternatively, it is desirable that the controller 21 has a configuration that allows it to be set to be enabled or disabled even when it is connected. The following describes an example in which the controller 21 has a removable configuration. The controller 21 complies with, for example, OPS (Open Pluggable Specification). Here, OPS is a standard for control modules and slots for digital signage. It is sufficient that the controller 21 has a CPU, memory, storage, various interfaces, etc.

[0077] The second control unit 302 determines whether or not the controller 21 is present. That is, in a configuration in which the controller 21 is removable, the controller 21 may be removed. Therefore, the second control unit 302 determines whether the controller 21 is connected (YES in step S1) or removed (NO in step S1). Whether or not the controller 21 is removed can be determined by checking whether or not a signal is being sent to or received from the controller 21. Also, whether or not the controller 21 is removed can be determined by a physical switch that detects the attachment or detachment of the controller 21 as an on / off state.

[0078] Next, if it is determined that the controller 21 is present (YES in step S1), the second control unit 302 proceeds to step S4. On the other hand, if it is determined that the controller 21 is not present (NO in step S1), the second control unit 302 proceeds to step S2.

[0079] (Example of reading stored values) (Step S2) The second control unit 302 reads a value that has been saved in advance from a memory or the like mounted on the control board 22. For example, the saved value is a value that has been updated in advance and set as the second volume value SD2, or a value that has been saved in advance in step S4 when the controller 21 is connected.

[0080] (Example of setting the second volume value) (Step S3) The second control unit 302 sets and updates the second volume value SD2.

[0081] (Example of saving the saved value) (Step S4) The first control unit 301 saves the saved value. Here, the first control unit 301 saves the current second volume value SD2 as the saved value in the memory of the control board 22 or the like. Step S4 is performed when the controller 21 is present. Then, from the subsequent step S5 onwards, the second volume value SD2 is fixed. Therefore, it is desirable that the value that becomes the second volume value SD2 be saved as the saved value.

[0082] In this way, with a configuration that saves the saved value, the previously used volume value can be secured even if the controller 21 is removed. Therefore, it is possible to prevent the initial value from becoming unstable due to removal or connection of the controller 21, and to prevent the volume value from suddenly increasing or decreasing.

[0083] (Example of fixing the second volume value) (Step S5) The second control unit 302 fixes the second volume value SD2. Thereafter, the second volume value SD2 becomes a fixed value that is fixed at a constant value even if an operation to change the volume is performed.

[0084] For example, it is desirable that the second volume value SD2 be fixed at the maximum value among the values that can be set (that is, the setting that allows the loudest sound to be output).

[0085] The second volume value SD2 is related to the degree to which sound is amplified by an amplifier or other amplifier, i.e., the volume of the output sound. Therefore, the second volume value SD2 determines the overall maximum volume value. And because the second volume value SD2 is fixed, if it is fixed to a small value, it will be impossible to set a large overall volume value thereafter.

[0086] On the other hand, if the second volume value SD2 is fixed to the maximum value, a high overall volume value can be set. Furthermore, if the overall volume value is high, the overall volume value can be reduced by changing the first volume value SD1 through operation, regardless of the second volume value SD2. Therefore, it is desirable to fix the second volume value SD2 at the maximum value.

[0087] (Example of setting the first volume value) (Step S6) The first control unit 301 sets a first volume value.

[0088] When an operation to change the volume value is accepted, the first control unit 301 changes the first volume value SD1 based on the operation result. In this way, when the first volume value SD1 is changed and the second volume value SD2 is fixed, the overall volume value can be changed.

[0089] (Example of determining whether or not there is a first speaker) (Step S7) The first control unit 301 determines whether or not the first speaker is connected.

[0090] Next, if the first speaker is connected (YES in step S7), the first control unit 301 proceeds to step S9. On the other hand, if the first speaker is not connected (NO in step S7), the first control unit 301 proceeds to step S8.

[0091] (Example of output from the second speaker) (Step S8) The second control unit 302 outputs the sound from the second speaker.

[0092] (Example of output from the first speaker) (Step S9) The first control unit 301 outputs sound from the first speaker. Note that sound may also be output from a built-in speaker.

[0093] 7, in the case where the configuration allows setting whether the controller 21 is enabled or disabled, the second control unit 302 determines in step S1 whether the controller 21 is enabled (YES in step S1) or disabled (NO in step S1), and if it is determined to be enabled (YES in step S1), the second control unit 302 proceeds to step S4. On the other hand, if it is determined to be disabled (NO in step S1), the second control unit 302 proceeds to step S2.

[0094] The second control unit 302 determines whether the operation is valid or invalid in step S1, for example, if the controller 21 is powered on, it is valid, and if the controller 21 is not powered on, it is invalid.

[0095] When the overall process described above is performed, the volume of the sound output from an external audio device such as a speaker can be controlled. Furthermore, when the overall process described above is performed, the controller 21 can be configured to be removable, enabled, or disabled.

[0096] <Comparative Example> 8 is a diagram showing a comparative example. Compared to the first connection configuration example, the comparative example differs in that it does not have the second control line LN2. Hereinafter, the same components will be assigned the same reference numerals and descriptions thereof will be omitted.

[0097] In the comparative example, since there is no second control line LN2, the operation results of the operation using the remote control 224 or the main body keys 223 cannot be sent to the controller 21. Therefore, when an operation is performed, the following results occur.

[0098] FIG. 9 is a diagram showing an example of operation in the comparative example. Compared with the first and second connection configuration examples, the comparative example differs in that the volume value changed by the volume operation SC is the second volume value SD2. The second volume value SD2 is for the amplifier 221 and does not affect the output of the first speaker SP1. That is, in a configuration like the comparative example, the volume value for the first speaker SP1 cannot be changed by operating the control board 22 and the amplifier 221. Furthermore, without the second control line LN2, the first volume value SD1 cannot be changed. In such a configuration, inconsistencies will occur unless processing is performed to synchronize the first volume value SD1 and the second volume value SD2.

[0099] Therefore, in the comparative example, when an external speaker such as the first speaker SP1 is used, the sound output from the external speaker may not be controllable.

[0100] <Other embodiments> Note that speakers other than those shown in the above example may also be used.

[0101] The sound output device may be applied to devices other than an electronic whiteboard. For example, the sound output device may be applied to a video conference system, a telephone conference room system, or a device that outputs music, etc. Furthermore, the sound output device may be applied to a television or projector used in a conference room, etc., or a television or projector used at home.

[0102] Each device does not have to be a single device. That is, each device may be a combination of multiple devices. Note that the configuration may further include devices other than those shown in the drawings.

[0103] All or part of the overall process may be written in a computer language and realized by a program for causing a computer to execute the sound output control method. That is, the program is a computer program for causing a computer, such as a sound output device, an electronic whiteboard, or a sound output system, to execute each process.

[0104] Therefore, when the sound output control method is executed based on the program, the arithmetic unit and the control unit of the computer perform calculations and control based on the program to execute each process, and the storage unit of the computer stores data used in the process based on the program to execute each process.

[0105] The program may also be distributed by being recorded on a computer-readable recording medium, such as a magnetic tape, flash memory, optical disk, magneto-optical disk, or magnetic disk. Furthermore, the program may be distributed via telecommunications lines.

[0106] Note that the embodiments of the present invention may be realized by a sound output system having a plurality of information processing devices. The sound output system may execute each process and data storage in a redundant, distributed, parallel, virtualized, or combination thereof.

[0107] Although one example of the embodiment has been described above, the present invention is not limited to the above embodiment, and various modifications and improvements are possible within the scope of the present invention. [Explanation of symbols]

[0108] 1. Image processing system 2. Electronic whiteboard 3. Display 20 Sound output device 21 Controller 22 Control board 221 Amplifier 222 Remote control receiver 223 Main unit key 224 Remote Control 301 First Control Section 302 Second Control Section 303 Sound Output Data LN1 First control line LN2 Second control line SC volume control SD1 1st volume value SD2 Second volume value SP1 1st speaker SP2 2nd speaker [Prior art documents] [Patent documents]

[0109] [Patent Document 1] Patent No. 6409512

Claims

1. a first control unit to which a first acoustic device is connected and which outputs a sound based on sound output data from the first acoustic device in accordance with first volume data; a second control unit to which a second acoustic device is connected and which has an amplifier unit that amplifies sound output from the second acoustic device, outputs sound based on the sound output data transmitted from the first control unit from the second acoustic device based on the first volume data transmitted from the first control unit, and controls to fix the second volume data set for the amplifier unit; an operation unit for changing the first volume data; Equipped with The second control unit is accepting an operation to change the first volume data by the operation unit; performing control to fix the second volume data; The first control unit receiving an operation result from the operation via the second control unit; Change the first volume data based on the operation result Sound output device.

2. The first control unit The first control unit can be removed or set to be enabled or disabled. The sound output device according to claim 1 .

3. a control line connecting the first control unit and the second control unit and transmitting the sound output data and the first volume data from the first control unit to the second control unit; The sound output device according to claim 1 or 2.

4. An electronic whiteboard comprising the sound output device according to any one of claims 1 to 3.

5. A sound output system having a sound output device and an information processing device, The sound output device is a first control unit to which a first acoustic device is connected and which outputs a sound based on sound output data from the first acoustic device in accordance with first volume data; a second control unit to which a second acoustic device is connected and which has an amplifier unit that amplifies sound output from the second acoustic device, outputs sound based on the sound output data transmitted from the first control unit from the second acoustic device based on the first volume data transmitted from the first control unit, and controls to fix the second volume data set for the amplifier unit; an operation unit for changing the first volume data; Equipped with The second control unit is accepting an operation to change the first volume data by the operation unit; performing control to fix the second volume data; The first control unit receiving an operation result from the operation via the second control unit; Change the first volume data based on the operation result Sound output system.

6. a first control unit to which a first acoustic device is connected; a second control unit to which a second acoustic device is connected and which has an amplifier unit that amplifies the sound output from the second acoustic device; An operation unit; A sound output control method performed by a sound output device having the first control unit outputs a sound based on sound output data from the first acoustic device based on first volume data; the second control unit outputs a sound based on the sound output data transmitted from the first control unit from the second acoustic device based on the first volume data transmitted from the first control unit, and controls to fix the second volume data set for the amplifier unit; the operation unit changes the first volume data, The second control unit is accepting an operation to change the first volume data by the operation unit; performing control to fix the second volume data; The first control unit receiving an operation result from the operation via the second control unit; Change the first volume data based on the operation result Sound output control method.

7. A program for causing a computer to execute the sound output control method according to claim 6.

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