JP4561709B2 - Audio system - Google Patents

Description

  The present invention relates to a speaker device capable of beaming and outputting an audio signal, and an audio system using the speaker device.

  In recent years, audio sources that realize multi-channel surround have become widespread due to an increase in media capacity and an improvement in communication speed. A home theater system that reproduces this is generally provided with a center speaker, a front L / R speaker, and a rear L / R speaker (and a low-frequency dedicated speaker).

  On the other hand, instead of a home theater system composed of a plurality of speakers, a speaker array formed by arranging a plurality of speaker units is used to form a plurality of sound beams having strong directivity in a predetermined direction and reflect them on the wall surface. An audio reproducing apparatus that reproduces sound with a sense of presence by forming a plurality of sound fields has been put into practical use (see, for example, Patent Document 1).

  In such a device, in order to realize an optimal sound field environment at the position of the listener (user), it is necessary to optimally set the volume and delay amount of each speaker and set the beam angle of the sound beam. In the conventional audio reproducing apparatus, the user changes the horizontal angle and the vertical angle of each sound beam using a remote controller.

  FIG. 1 is a diagram for explaining sound beam control. As shown in FIG. 1, the speaker array composed of a plurality of speaker units SP forms a virtual focus at a predetermined distance and angle in front from the center position of the array. Here, sound is output from each speaker unit SP with a wavefront that converges to the virtual focus. In other words, the sound is first output from the speaker unit SP farthest from the virtual focus, and is output sequentially with delay from the adjacent speaker unit SP, so that each speaker unit is arranged at an equal distance from the virtual focus. Delay so that audio can be output.

  This audio playback apparatus is provided with a remote control, and the angle and focus of the beam are changed with this remote control. FIG. 2 is a diagram for explaining an example in which an audio beam angle and focus change are instructed from the remote controller. As shown in FIG. 2A, when the user gives an instruction to change the angle of the sound beam in the array center axis direction using the remote controller, a command for changing the beam angle is transmitted from the remote controller. Upon receiving this command, the speaker device recalculates the delay amount of the audio signal supplied to each speaker unit SP so that the horizontal irradiation direction of the audio beam is changed.

Thereafter, as shown in FIG. 2B, when the user gives an instruction to move the focal point of the sound beam to the speaker array side (that is, to shorten the focal length) using the remote controller, the command to change the focal distance from the remote controller. Is sent. Upon receiving this command, the speaker device recalculates the delay amount of the audio signal supplied to each speaker unit SP so that the focal length of the audio beam is changed.
JP 2006-67218 A

  Conventionally, as shown in FIG. 2, each time a user gives an instruction to change the horizontal angle, vertical angle, and focal length, the delay amount of the audio signal supplied to each speaker unit is recalculated and set. It was.

  Conventionally, once the horizontal angle, vertical angle, and focal length of the sound beam are set so that each sound beam reaches (forms a focal point) directly or reflects on the user's position, the user can These settings were not changed as long as they were in position.

  However, in recent years, in home theater systems (or theater, stage, etc.), it has been desired that the sound changes more realistically according to the change of the image, and the angle and focus of the beam are continuously changed according to the change of the image. It is necessary to change the distance. In such a situation, as described above, it is seamless if the speaker device recalculates the delay amount of the audio signal supplied to each speaker unit each time it receives a command of horizontal angle, vertical angle, and focal length. The sound beam could not be changed. Further, if the delay amount is recalculated every time a command of the horizontal angle, vertical angle, and focal length is received, there is a problem that processing time is wasted.

  It is an object of the present invention to provide a speaker device and an audio system that can realize seamless change in the angle and focal length of a sound beam and reduce the calculation time of the delay amount.

  The speaker device according to the present invention provides a speaker array formed by arranging a plurality of speaker units, and a sound beam having strong directivity in a predetermined direction by giving a predetermined delay to an audio signal supplied to each speaker unit. A signal processing unit to be output to the speaker array, a command for instructing the horizontal irradiation direction of the sound beam, a command for instructing the vertical irradiation direction, and a command for instructing a focal distance from the speaker array from the outside, and Based on the command received by the receiving unit, the signal processing unit calculates a delay amount to be added to each audio signal, and setting the calculated delay amount in the signal processing unit, the irradiation direction of the audio beam, A speaker unit comprising: a control unit that controls a focal point; wherein the receiving unit is configured to receive one or more prior to receiving the command. Header information indicating a combination of commands is further received, and when the receiving unit receives the header information, the control unit receives all commands of the command combination indicated by the header information, and then receives all the received commands. The delay amount is calculated based on the command.

  In this configuration, the receiving unit indicates a command for instructing the horizontal angle, vertical angle, focal length (distance from the speaker array center position) of the sound beam from the outside, and a combination of commands prior to receiving these commands. Receive header information. When the control unit receives a command without receiving header information as in the prior art, the control unit calculates a delay amount to be added to the audio signal supplied to each speaker unit when each command is received (normal mode). Execute. On the other hand, when receiving the header information, the control unit receives each command of the combination of commands indicated by the header information (horizontal angle, vertical angle, part of or all of the focal length), and sends it to each speaker unit. A mode (sequencer mode) for calculating a delay amount to be added to the supplied audio signal is executed. For example, when receiving commands indicating changes in the horizontal angle and vertical angle, the sound beam irradiation angle is seamlessly calculated to calculate the delay amount of the audio signal supplied to each speaker unit after receiving both commands. Since there is no need to calculate the delay amount every time a command is received, the calculation time can be reduced. Note that if the combination of commands indicated by the header information indicates one command, the control unit calculates the delay amount at the time when the command is received, which is equivalent to executing the normal mode.

  In addition, the command combination may include other commands for instructing the sound volume level, the sound effect, and the like.

  An audio system according to the present invention is an audio system including the speaker device according to claim 1 and an external device connected to the speaker device, and the external device includes an irradiation direction and a focal point of an audio beam. A storage unit that stores sequence data representing information in time series, a sequencer that reads the sequence data from the storage unit and generates the one or more commands and header information, and one or more generated by the sequencer And a transmitter that transmits the header information to the receiver of the speaker device.

In this configuration, audio beam sequence data in which the horizontal angle, vertical angle, and focal length of an audio beam are represented in time series is stored in an external device (a content playback device incorporating a sequencer). The sequencer sequences the audio beam sequence data, and generates header information indicating a command indicating the horizontal angle, vertical angle, focal length (distance from the center position of the speaker array) of the audio beam, and a combination of the commands. When the control unit of the speaker device receives the header information, each control unit receives each command of the combination of commands indicated by the header information (horizontal angle, vertical angle, part of or all of the focal length). A mode (sequencer mode) for calculating a delay amount to be added to the supplied audio signal is executed. For example, when receiving a command indicating changes in the horizontal angle and vertical angle, the sound beam irradiation angle is seamlessly calculated to calculate the delay amount of the audio signal supplied to each speaker unit after receiving both commands. Since there is no need to calculate the delay amount every time a command is received, the calculation time can be reduced.
In addition, the command combination may include other commands for instructing the sound volume level, the sound effect, and the like.

  Further, the audio system of the present invention includes a command for instructing a horizontal irradiation direction of the sound beam, a command for instructing a vertical irradiation direction, and a command instructing a focal distance from a speaker array without adding the header information. A remote controller for transmitting to the speaker device is further provided.

  In this configuration, the remote controller transmits a command that indicates the horizontal angle, vertical angle, and focal length of the sound beam. In this case, the remote controller does not transmit header information. When receiving a command from the remote control without receiving header information, the control unit executes a mode (normal mode) that calculates the amount of delay added to the audio signal supplied to each speaker unit when each command is received. To do. As a result, the normal mode is executed when a command for changing the sound beam angle and focus is received from the remote controller, and the sequencer mode is executed when a command for changing the header information and the sound beam angle and focus is received from an external device. The normal mode and the sequencer mode can be switched.

  According to the present invention, the calculation time of the delay amount can be reduced, and seamless change in the angle and focal length of the sound beam is realized. In addition, the sound beam can be changed in real time in synchronization with video, sound, etc., and a sound field full of realism can be formed.

  An audio system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a block diagram showing the configuration of the audio system. This audio system includes a content reproduction device 1, a speaker device 2, a display device 3, and a remote controller 4.

  The content reproduction apparatus 1 reproduces content composed of video data and music data. The content reproduction apparatus 1 includes a control unit 11, a storage unit 12, a sequencer 13, a video processing unit 14, and an operation unit 15. A storage unit 12, a sequencer 13, and an operation unit 15 are connected to the control unit 11. A video processing unit 14 is connected to the sequencer 13.

  The storage unit 12 is composed of, for example, a hard disk, a ROM, or the like, and stores a program for operating the content reproduction apparatus 1 and data necessary for executing this program. The storage unit 12 stores a plurality of content data and sequence data associated with each content data. The sequence data includes video sequence data, music sequence data, and audio beam sequence data. The video sequence data is data representing time-series reproduction of video data (reading of images). The music sequence data is data representing the reproduction of music (generation of musical sound by a sound source) in time series. As will be described later, the sound beam sequence data is data representing the angle and focal length of the sound beam in time series.

  The sequencer 13 reads out the sequence data from the storage unit 12, reproduces video and music at a timing indicated by the sequence data, and outputs a video signal to the video processing unit 14 and an audio signal to the speaker device 2. In addition, change instruction data (audio beam control information) of the angle and focal length of the audio beam is transmitted to the speaker device 2 at the timing indicated by the audio beam sequence data. Thereby, the change of an image | video and an audio | voice and the change of an audio beam are synchronized.

The video processing unit 14 displays a video on the display device 3 including a liquid crystal display based on the video signal input from the sequencer 13.
The operation unit 15 includes an operation interface including a plurality of operation buttons, and receives an operation from a user.

  The control unit 11 performs various processes by reading the operation program from the storage unit 12 and developing it in a built-in RAM (not shown). The control unit 11 reproduces content data specified by the user via the operation unit 15. That is, the sequencer 13 is instructed to read out the sequence data, and a reproduction process for generating a video signal and an audio signal by inputting the sequence data is performed. The reproduced video signal of the content is supplied to the video processing unit 14, and the audio signal is supplied to the speaker device 2.

The speaker device 2 is connected to the content reproduction device 1, receives an audio signal from the content reproduction device 1, and emits sound based on the audio signal.
FIG. 4 is a front view of the speaker device 2. In the figure, the right side is described as X, the left side as -X, the upper side as Z, and the lower side as -Z. The speaker device 2 includes a speaker array 202 in which a plurality of speaker units SP are arranged in a honeycomb shape so that a sound emitting surface faces the front, and two woofers U1 disposed on both sides of the speaker array 202. , U2. The woofers U1 and U2 are large-diameter speakers and output only the low frequency range of the input audio signal.

  In the speaker array 202, three stages of speaker units SP are arranged at predetermined intervals in the Z to -Z directions, and 15 speaker units SP of speaker units SP11 to SP115 are arranged at predetermined intervals on the uppermost stage. It is arranged. In the middle stage, 14 speaker units SP of the speaker units SP21 to SP214 are arranged at a predetermined interval. Eleven speaker units SP of speaker units SP31 to SP311 are arranged at a predetermined interval at the lowermost stage. The number and arrangement of the speakers are not limited to this example. For example, it may be arranged densely at the center along the longitudinal direction of the apparatus main body and sparsely arranged toward both ends.

  The speaker device 2 can output a sound beam having strong directivity in a predetermined direction by configuring the speaker array 202 with a plurality of speaker units SP. Further, by giving a predetermined delay time to the audio data input to each speaker unit SP, the output direction of the audio beam is controlled to an arbitrary position in the XX direction and the ZZ direction (horizontal direction, vertical direction). The focus of the sound beam can be controlled to an arbitrary position. A plurality of sound beams can be set.

  As shown in FIG. 3, the speaker device 2 includes a control unit 21, a memory 22, an interface 23, a signal processing unit 24, and an infrared receiving unit 25 in addition to the speaker array 202 and the woofers U <b> 1 and U <b> 2. A memory 22, an interface 23, a signal processing unit 24, and an infrared receiving unit 25 are connected to the control unit 21. Note that illustration and description of signal processing for audio signals output to the woofers U1 and U2 are omitted here.

  The memory 22 is composed of, for example, a hard disk, a ROM, or the like, and stores a program for operating the speaker device 2 and data necessary for executing this program.

  The interface 23 is an interface circuit for inputting an audio signal and audio beam control information from the content reproduction apparatus 1. The interface 23 receives an audio signal from the content reproduction apparatus 1 and outputs it to the signal processing unit 24. The interface 23 receives the audio beam control information from the content reproduction apparatus 1 and outputs it to the control unit 21. Further, the interface 23 cuts the input audio signal for each channel (for example, center, front left / right, rear left / right) and outputs it to the signal processing unit 24.

  The signal processing unit 24 adjusts the level and delay of the input audio signal for each channel, and outputs this to the subsequent speaker unit SP. The signal processing unit 24 controls the output angle and focal length of the sound beam by individually controlling the level and delay amount of the sound signal supplied to each speaker unit SP. The level adjustment amount and the delay amount are set by the control unit 21.

  The control unit 21 is composed of, for example, a CPU, and calculates the level and delay amount of the audio signal supplied to each speaker unit SP based on the audio beam control information input from the content reproduction apparatus 1 via the interface 23. This is set in the signal processor 24 (sequencer mode). Further, the level and delay amount of the audio signal are calculated based on the audio beam control information (in this case, a command for changing the audio beam irradiation direction and focal length) input from the remote controller 4 via the infrared receiver 25. And set in the signal processing unit 24 (normal mode). That is, the control unit 21 executes the sequencer mode when the audio beam control information is input from the content reproduction apparatus 1 via the interface 23 and receives the audio beam control information from the remote control via the infrared reception unit 25. In normal mode.

  In the normal mode, the user can use the remote controller 4 to instruct changes in the sound beam angle, focal length, volume, and the like. The remote controller 4 includes an operation unit including a plurality of operation buttons, and includes an infrared transmission unit for transmitting user operation information input from the operation unit. The user instructs to change any one of the sound beam angle, the focal length, the volume, and the like using the operation unit, and the sound beam control information based on this instruction is transmitted from the infrared transmitting unit of the remote controller 4 to the infrared receiving unit of the speaker device 2. 25 to the control unit 21. When receiving the sound beam control information, the control unit 21 of the speaker device 2 recalculates the delay amount of the sound signal supplied to each speaker unit SP so that the sound beam is output at an angle instructed by the command. .

  Hereinafter, a specific operation of the audio system in the sequencer mode will be described. When the user instructs content playback using the operation unit 15, the control unit 11 sets the sequencer 13 to read sequence data associated with the content from the storage unit 12.

  As shown in FIG. 5, the sound beam sequence data is data representing the angle and the focal length of the sound beam in time series. FIG. 5 is a diagram showing the structure of the audio beam sequence data. The graph shown in FIG. 6A shows the sound beam sequence data on the time axis, and the table shown in FIG. 5B lists the sound beam sequence data at each time timing. The horizontal axis of the graph in FIG. 3A represents time, and the vertical axis represents beam angle and focal length. The beam angle means an angle of deviation from the center position of the speaker array to the front central axis. That is, the sound beam output to the front from the array center position of the speaker array has a beam angle of 0 degrees, the sound beam output to the right side (upward) is 90 degrees, and the sound beam to be output to the left side (down) is right. The beam angle is -90 degrees. The focal length means the distance from the center position of the speaker array to the focal point. Although not shown, the sound beam sequence data may describe volume and information indicating acoustic effects. The acoustic effect is an effect such as so-called reverb or chorus. The acoustic effect is given to each sound beam by the signal processing unit 24.

  The sequencer 13 sequences the audio beam sequence data shown in FIG. 9A and FIG. 10B, generates audio beam control information, and outputs it to the speaker device 2. For example, at the time T0, the audio beam sequence data indicates a horizontal angle of −60 degrees, a vertical angle of 75 degrees, and a focal length of 1 m. Therefore, the sequencer 13 connects the speaker device 2 to the horizontal angle of −60 degrees and the vertical angle. Information (sound beam control information) instructing to set the sound beam at 75 degrees and a focal length of 1 m is transmitted. Next, since the audio beam sequence data indicates a horizontal angle of −40 degrees, a vertical angle of −10 degrees, and a focal length of 3 m at the time T1, the sequencer 13 sends a horizontal angle of −40 degrees to the speaker device 2. Information for instructing to set the sound beam at a vertical angle of −10 degrees and a focal length of 3 m is transmitted.

  Here, the audio beam control information transmitted from the sequencer 13 to the speaker device 2 will be described. FIG. 6 is a diagram for explaining the sound beam control information. The sound beam control information is transmitted for each channel of a plurality of sound beams. The sound beam control information includes data indicating control of the transfer mode, channel, and sound beam, which are headers. The information indicating the control of the sound beam further includes one or a plurality of commands for instructing the horizontal angle, the vertical angle, the focal length, and the volume level.

  The transfer mode indicates the content of information indicating the control of the sound beam to be transmitted (that is, a combination of commands). If the transfer mode indicates “transfer mode 1” as shown in FIG. The transmitted data means that only one command for instructing the horizontal angle is transmitted as information indicating the control of the sound beam. Also, as shown in FIG. 5B, if the transfer mode indicates “transfer mode 2”, the horizontal angle and the vertical angle are designated as information indicating the control of the sound beam in the data to be transmitted thereafter. Means that two commands are transmitted. Further, as shown in FIG. 5C, if the transfer mode indicates “transfer mode 3”, the data transmitted thereafter includes horizontal angle, vertical angle, and focus as information indicating control of the sound beam. This means that three commands indicating the distance are transmitted. As shown in FIG. 4D, if the transfer mode indicates “transfer mode 4”, the data transmitted thereafter includes horizontal angle, vertical angle, and focal length as information indicating control of the sound beam. , And four commands indicating the volume level are transmitted. Although an example in which a command indicating a horizontal angle is transmitted as “transfer mode 1” is described here, a command indicating a vertical angle in addition to a horizontal angle, a command indicating a focal length, or a volume level is indicated. When only the command to be transmitted is transmitted, “transfer mode 1” is set. Similarly, “Transfer mode 2” includes a command for instructing a horizontal angle and a focal length, and “Transfer mode 3” also includes a horizontal angle, a vertical angle, and a volume level. This mode is also included in the case of sending a command to instruct.

  When the sound beam control information is received, the control unit 21 of the speaker device 2 determines “modes 1 to 4” indicated by the transfer mode. The control unit 21 calculates the delay amount of the audio signal supplied to the speaker unit SP according to each mode indicated by the transfer mode. That is, when receiving the sound beam control information indicating “transfer mode 1”, the control unit 21 starts calculating the delay amount at the time of receiving a command indicating the horizontal angle. This is equivalent to the case where audio beam control information (information not including the transfer mode) is received from the remote controller 4 as shown in FIG. 2, that is, the normal mode.

  When receiving the audio beam control information indicating “transfer mode 2”, the control unit 21 starts calculating the delay amount at the time of receiving a command indicating the horizontal angle and the vertical angle. When the control unit 21 receives the audio beam control information indicating “transfer mode 3”, the control unit 21 starts calculating the delay amount at the time of receiving the command indicating the horizontal angle, the vertical angle, and the focal length. Further, when receiving the sound beam control information indicating “transfer mode 4”, the control unit 21 starts calculating the delay amount at the time of receiving the command indicating the horizontal angle, the vertical angle, and the focal length.

  The sequencer 13 transmits the sound beam control information in any of the above modes. For example, at the timing of time T1 shown in FIG. 5, the sound beam is changed from the setting of the horizontal angle of −60 degrees, the vertical angle of 75 degrees, and the focal length of 1 m to the horizontal angle of −40 degrees, the vertical angle of −10 degrees, and the focal length of 3 m. Therefore, the sequencer 13 transmits audio beam control information indicating a horizontal angle of −40 degrees, a vertical angle of −10 degrees, and a focal length of 3 m to the speaker device 2 in the transfer mode 3. On the other hand, at the timing of time T4 shown in FIG. 5, since the sound beam is changed from the setting of the horizontal angle of 10 degrees, the vertical angle of -50 degrees, and the focal length of 5 m, the horizontal angle changes only to 40 degrees. The sound beam control information indicating the horizontal angle of 40 degrees is transmitted to the speaker device 2 in the transfer mode 1.

  Of course, the sequencer 13 can transmit audio beam control information indicating a horizontal angle of −40 degrees, a vertical angle of −10 degrees, and a focal length of 3 m to the speaker device 2 in the transfer mode 1. In this case, first, a command indicating a horizontal angle of −40 degrees is transmitted in the transfer mode 1, a command indicating a vertical angle of −10 degrees is transmitted in the transfer mode 1, and finally a focal length of 3 m is transmitted in the transfer mode 1. It is sufficient to send a command instructing.

  The sequencer 13 transmits the sound beam control information by properly using the transfer modes 1 to 4 as described above, and the control unit 21 changes the timing at which the calculation of the delay amount is started in the transfer modes 1 to 4, FIG. As shown, the calculation time of the delay amount can be reduced, and seamless change of the angle and focal length of the sound beam is realized. In addition, the sound beam can be changed in real time in synchronization with video and audio, and a sound field full of realism can be formed.

  FIG. 7 is a diagram comparing the calculation time of the delay amount and the change in the angle of the sound beam when the information for changing the horizontal angle and the vertical angle is transmitted in the transfer mode 1 and the transfer mode 2 as the sound beam control information. is there.

  FIG. 7A is a diagram comparing the calculation times of the delay amounts in the transfer mode 1 and the transfer mode 2. As shown in FIG. 6A, in the transfer mode 1, the control unit 21 starts calculation of the delay amount at the timing of receiving the command for instructing the horizontal angle. After setting the delay amount to, the delay amount is recalculated based on the command indicating the vertical angle. On the other hand, in the transfer mode 2, at the timing when both commands indicating the horizontal angle and the vertical angle are received, the calculation of the delay amount is started based on the angles specified by these two commands. Thereby, even when a command for instructing the same angle change is received, the calculation time is reduced in the case of calculating the delay amount in the transfer mode 2.

  FIG. 5B is a diagram for comparing the change in the angle of the sound beam in the transfer mode 1 and the transfer mode 2. As shown in FIG. 5B, in the transfer mode 1, the control unit 21 first starts calculating the delay amount at the timing when the command indicating the horizontal angle is received, and sets the delay amount in the signal processing unit 24. , Once change the angle of the sound beam. Thereafter, the delay amount is recalculated on the basis of the command for instructing the vertical angle, and is reset in the signal processing unit 24. On the other hand, in the transfer mode 2, at the timing when both the commands indicating the horizontal angle and the vertical angle are received, the calculation of the delay amount is started based on the angle indicated by these two commands, and the signal processing unit 24 is notified. In order to set the delay amount, the target sound beam angle is changed at a time. Therefore, in transfer mode 1, the vertical angle is changed after the horizontal angle of the audio beam is once changed. In transfer mode 2, the angle of the audio beam is changed seamlessly.

The figure explaining sound beam control The figure explaining the example which instruct | indicates the change of an audio beam angle and a focus Diagram showing the configuration of the audio system Front view of speaker device 2 Diagram showing the structure of audio beam sequence data The figure explaining sound beam control information The figure which compares the calculation time of the delay amount at the time of transmitting the information which changes a horizontal angle and a vertical angle as audio beam control information in transfer mode 1 and transfer mode 2, and the angle change of an audio beam

Explanation of symbols

1-content playback device 1
2-speaker device 10-remote control

Claims (4)

A speaker array in which a plurality of speaker units are arranged;
A signal processing unit that outputs a sound beam having strong directivity in a predetermined direction to the speaker array by giving a predetermined delay to the audio signal supplied to each speaker unit;
A receiving unit for receiving a command for instructing a horizontal irradiation direction of the sound beam, a command for instructing a vertical irradiation direction, and a command for instructing a focal length from the speaker array;
Based on a command received by the receiving unit, the signal processing unit calculates a delay amount to be added to each audio signal, and sets the calculated delay amount in the signal processing unit, thereby irradiating the sound beam. A control unit for controlling the focus;
An audio system comprising: a speaker device comprising: and an external device connected to the speaker device ,
The receiving unit further receives header information indicating a combination of one or more commands prior to receiving the command,
The control unit, when the receiving unit has received the header information, after receiving all commands of the combination of commands indicated by the header information, performs the calculation of the delay amount based on all received commands ,
The external system is an audio system including a transmission unit that transmits a command indicating an irradiation direction and a focal length of an audio beam synchronized with content.   2. The audio system according to claim 1, wherein, when the receiving unit receives a command without receiving the header information, the control unit calculates the delay amount when the command is received. A your audio system according to claim 1 or 2,
The external device includes a storage unit that stores sequence data that represents information including the irradiation direction and focus of the sound beam in time series;
A sequencer that reads the sequence data from the storage unit and generates the one or more commands and header information;
With
The transmission unit transmits one or more commands generated by the sequencer and a command indicating the irradiation direction and focal length of the sound beam synchronized with the content by transmitting header information to the reception unit of the speaker device. system. A remote control for transmitting a command for instructing a horizontal irradiation direction of the sound beam, a command for instructing a vertical irradiation direction, and a command instructing a focal length from a speaker array to the speaker device without adding the header information;
Further audio system according to claim 1 comprising a.

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