Patent Translate Powered by EPO and Google Notice This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate, complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or financial decisions, should not be based on machine-translation output. DESCRIPTION JP2005079614 A mobile audio output device capable of reducing the consumption output of a mobile audio output device driven by a battery. A power supply unit (12) charges a battery (14) when power is supplied from a playback device, and drives the battery (14) when power is not supplied. When it is detected in the power supply unit 12 that power is not supplied from the playback device, the wireless interface unit 11 sets a radio channel with the playback device, and the playback device is set via the wireless channel. Receive audio data from On the other hand, when it is detected that power is being supplied, the wireless channel with the playback device is disconnected. [Selected figure] Figure 4 Mobile voice output apparatus, content reproduction apparatus, wireless channel control method and synchronization control method BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile audio output apparatus for reproducing content, a content reproduction apparatus, a radio channel control method, and a synchronization control method. [0002] As a system for reproducing video / audio content, for example, a device such as a player for decoding content and a device such as a TV for reproducing content are connected by a wired cable, Generally, video / audio contents recorded on a DVD disc are reproduced by a DVD player or the like, and the audio / image signal is sent to a TV or the like for reproduction. On the other hand, in recent years, with the progress of wireless systems, a system that can be used in a portable manner by trying to wirelessly communicate between a player etc. and a TV etc. is going to be put to practical use. In this case, generally, in order to perform wireless communication between the devices, it is necessary to establish a wireless channel during data transfer. With regard to channel construction, a system in which the user manually performs this, or a system in which a radio channel is always open when power is supplied (see, for example, Patent Document 1). 10-05-2019 1 Furthermore, with the miniaturization of the playback apparatus side and with the improvement of portability, there has been a demand for placing them at arbitrary places. For example, a wireless speaker having a wireless interface and a function of reproducing digital audio information is a typical example. In this case, in addition to the wireless communication function and the digital audio information reproduction function, the reproduction device such as the wireless speaker needs to be equipped with a battery or the like for driving them. Here, a wireless headphone is a typical conventional example of the playback device. The wireless headphone always secures a communication channel with a main unit such as a player and reproduces music information sent from the main unit, and power saving communication such as infrared rays is performed. So, with wireless headphones there were no problems such as power consumption. [0006] On the other hand, it is assumed that the system performs reproduction with a battery-powered wireless speaker, and uses a wireless communication by an RF signal to transmit AV data between the main unit and the wireless speaker. In this case, it is very difficult to always secure a communication channel between the main device and the wireless speaker, considering the power consumption. Next, when AV data is transmitted on a wireless system, not only the transmission delay but also data delay such as AV content reproduction delay in each device or fluctuation occurs. In general, the playback delay of the content can not be statically fixed to any content in advance, so when the video and audio are played back on a wirelessly connected device, the delay is corrected, A mechanism for synchronizing and playing back content is necessary, but such a mechanism has not been provided. Patent Document 1: Japanese Patent Application Laid-Open No. 2002-064896 SUMMARY OF THE INVENTION Conventionally, a battery-operated wirelessly connected speaker is operated in cooperation with the main body of the content reproduction apparatus , It was difficult to reduce the power consumption of the speaker. On the other hand, it has been difficult to synchronize and reproduce the audio reproduced by the speaker and the video reproduced by the content reproduction apparatus or its peripheral device with respect to the user. The present invention has been made in consideration of the above circumstances, and it is possible to reduce the consumption output of a mobile audio output device driven by a battery, a content reproduction device, and a radio channel control method. Intended to provide. Another object of the present invention is to provide a content reproduction apparatus and a synchronization control method capable of synchronizing a video and a plurality of audios. A mobile audio output apparatus according to the present invention controls the setting and disconnection of a wireless channel with a content reproduction apparatus, and the wireless channel from the content reproduction apparatus Wireless interface means for receiving audio data via the interface, a playback means for playing back the audio data, a battery for supplying power to the wireless interface means and the playback means, and connection to the content playback apparatus Connection interface means for receiving supply of power from the content reproduction device; and charging of the battery when supply of power from the content reproduction device is received via the connection interface means; By the battery when not 10-05-2019 2 receiving power supply The wireless interface means and a power supply means for supplying power to the reproduction means, wherein the power supply means is configured to receive the first notification including the effect when the power supply is not received from the content reproduction device When information is sent to the wireless interface means and power is supplied from the content reproduction apparatus, second notification information including the information is sent to the wireless interface means, and the wireless interface means The radio channel is set when the notification information of 1 is received, and the radio channel is disconnected when the second notification information is received. Further, the content reproduction apparatus according to the present invention controls setting and disconnection of a wireless channel between means for inputting content including audio data from the outside and the mobile audio output apparatus. Wireless interface means for transmitting the voice data to the mobile voice output device via a wireless channel, connection interface means to which the mobile voice output device can be connected, and the mobile voice connected to the connection interface means Power supply means for supplying power to the output device, the power supply means, when the power supply is not supplied to the mobile voice output device, the first notification information including the purport to that effect If the mobile voice output device is supplied with power, the second notification information including the fact is sent to the wireless interface means. The wireless interface means is configured to set the wireless channel upon receiving the first notification information, and to disconnect the wireless channel upon receiving the second notification information. Further, the content reproduction apparatus according to the present invention comprises means for inputting contents including video data and audio data from the outside, means for transmitting the audio data to a plurality of audio output devices, and a video display device. A means for transmitting the video data, a transmission delay when transmitting the audio data to each of the audio output devices, a transmission delay when transmitting the video data to the video display device, and the respective audio output devices A first processing means for obtaining a reproduction delay in reproducing the audio data and a reproduction delay in reproducing the video data in the video display device; and the audio output device based on the transmission delay and the reproduction delay. And an additional delay time provided in each of the video display devices is transmitted in all the audio output devices and the video display devices. Second processing means for determining the sum of delay, reproduction delay and additional delay time to be equal, means for notifying the audio output device of the additional delay time, and the video data to the video display device And means for providing a delay equal to the additional delay time in transmission. The present invention relating to an apparatus also holds true as an invention relating to a method. According to the present invention, when the wirelessly connected mobile audio output apparatus is operated in cooperation with the main body of the content reproduction apparatus, the radio channel is used only when necessary so as to achieve the minimum power consumption. Will be able to build. 10-05-2019 3 Further, according to the present invention, the audio reproduced by the mobile type audio output apparatus connected wirelessly and the video reproduced by the video display apparatus are reproduced and displayed in synchronization with the user. be able to. DETAILED DESCRIPTION OF THE INVENTION Embodiments of the invention will be described below with reference to the drawings. First Embodiment FIG. 1 shows a configuration example of a content reproduction system according to a first embodiment of the present invention. As shown in FIG. 1, in the present content reproduction system, a predetermined number of wireless speakers (parts of mobile audio output devices in the present content reproduction system) 1 and a main unit side device (which can be detached and attached) The content reproduction system includes a portion 2 of the content reproduction apparatus excluding the wireless speaker. Although content including video and audio is assumed as the content, the same applies to content including audio and not including video. The main device 2 basically has a function of supplying content to be reproduced to each output device such as the wireless speaker 1, but the display screen built in the main device 2 is A configuration including this and a configuration not including this are possible, and the same applies to a speaker built into the main body side device 2. More specifically, the main body side device 2 corresponds to, for example, a video reproduction device such as a DVD player. Although FIG. 1 exemplifies a case in which two wireless speakers 1 are provided on the assumption of a two-channel system, the present invention is of course not limited thereto, and one wireless speaker 1 may be used. It may be three or more. Also, for example, initially, two wireless speakers 1 may be provided, and in the future, expandability may be provided such that up to five can be added. FIG. 2A shows an example of the connection interface (231 in the figure) of the power supply unit of the wireless speaker 1, and FIG. 2B shows the connection interface of the power supply unit of the main unit 2. An example of a part (in the figure, 121) is shown. An image obtained by physically connecting the power supply units 12 of the wireless speakers 1 to the connection interface unit of the power supply unit 23 of the main unit 2 and integrating them is shown in FIG. Of course, the connection interface unit of FIG. 2 is an example, and various other variations are possible. In the present embodiment, when using the present content reproduction system, each wireless speaker 1 is separated from the main body side device 2 and installed and used at a desired place. At this time, each wireless speaker 1 is driven by a built-in battery. On the other hand, when the present content reproduction system is not used, each wireless speaker 1 is attached to the main apparatus 2 as shown in FIG. At this time, power can be supplied from the main unit 2 to each wireless speaker 1 so that the built-in battery of each wireless speaker 1 can be charged. Next, FIG. 3 shows a configuration example of the main body side device 2 of the present content reproduction system. As shown in FIG. 3, the main unit 2 includes a wireless interface unit 21, an AV decoding unit 22, and a power supply unit 23. The main device 2 has one or both of a function for acquiring AV content data from a recording medium and a function for acquiring data via a network. A content acquisition unit having this function is omitted in FIG. The AV 10-05-2019 4 decoding unit 22 decodes the acquired AV content to generate audio data and video data. Audio data generated by the AV decoding unit 22 is supplied to the wireless interface unit 21, and video data is directly supplied to the monitor 3 such as a TV. The wireless interface unit 21 reencodes audio data for wireless transfer, and then transfers the audio data to each wireless speaker 1. Here, each wireless speaker 1 has a unique address, and the wireless interface unit 21 uses the unique address of each wireless speaker 1 and the channel (for example, right voice, left voice, etc.) of the speaker. It is assumed that they are managed in a table in association with attribute information such as information indicating whether they correspond. Then, the wireless interface unit 21 transmits the audio data of each channel to the corresponding non-addressed wireless speaker 1 with reference to this table. Further, the monitor 3 displays video data. The monitor 3 may be included in the main device 2 or may be externally connected. When each wireless speaker 1 is not used, if the monitor 3 has an audio output function, audio data may be supplied to the monitor 3 together with video data and output, or the main body side If the device 2 has a built-in speaker, audio data may be output from the built-in speaker. On the other hand, the power supply unit 23 supplies power to each part in the main body side device 2 and also supplies power to the wireless speaker 1 attached to the own device as described above. The power supply to the wireless speaker 1 may be performed by AC or DC. Further, the power supply method to the power supply unit 23 may be any method such as a method using AC power or DC power or a method using a battery. Next, FIG. 4 shows a configuration example of the wireless speaker 1 of the present content reproduction system. As shown in FIG. 4, the wireless speaker 1 includes a wireless interface unit 11, a power supply unit 12, an audio reproduction unit 13, and a battery 14. The wireless interface unit 11 receives audio data sent from the main unit 2 to the own apparatus, decodes the received audio data, and transfers the data to the audio reproduction unit 13. The sound reproduction unit 13 reproduces and outputs the transferred sound data as a sound from the speaker. When the wireless speaker 1 is used separately from the main unit 2, the power supply unit 12 receives power from the battery 14 to supply power to each unit in the wireless speaker 1. Do. Further, at this time, it is determined that the power supply from the outside is cut off, and the wireless interface unit 11 is notified of first notification information including that effect. On the other hand, when the wireless speaker 1 is attached to the main device 2, the power supply unit 12 receives power from the main device 2 and supplies power to each part in the wireless speaker 1. And charge the battery 14. Further, at this time, it is determined that power is supplied from the outside, and the second notification information including that is notified to the wireless interface unit 11. At this time, the audio data at the time of attachment may be sent to the audio reproduction unit not by wireless but by wire. Here, the case of performing setting / disconnection of the wireless channel by the initiative of the wireless speaker 1 will be described. When the wireless speaker 1 is separated from the main device 2 (see FIG. 3) and the power supply from the main device 2 to the wireless speaker 1 is stopped, the power supply unit 12 of the wireless speaker 1 It detects and notifies the wireless interface unit 11 of first notification information including that effect. 10-05-2019 5 The wireless interface unit 11 that has received the first notification information attempts to establish a wireless connection with the main device 2 in order to establish a wireless channel with the main device 2. For example, when the wireless connection is performed by Bluetooth, the wireless interface unit 11 that has received the notification of the power supply disconnection establishes a Bluetooth HCI connection with the wireless interface unit 21 of the main device 2. After the HCI is established, the connection of the upper layer and the wireless channel are established, and finally, the communication preparation to the layer capable of transferring the digital voice signal is prepared. On the other hand, when the wireless speaker 1 is attached to the main device 2 (see FIG. 1) and the power supply from the main device 2 to the wireless speaker 1 is resumed while the wireless channel is established, the wireless In the speaker 1, the power supply unit 12 detects this and notifies the wireless interface unit 11 of second notification information including that effect. The wireless interface unit 11 that has received the second notification information disconnects the wireless channel with the main apparatus 2. When the wireless channel with the main unit 2 is disconnected, the wireless interface unit 11 notifies the power supply unit 12 to that effect, and shifts the wireless speaker 1 to the power saving mode. It is preferable to do so. In this case, when the wireless channel with the main device 2 is set, the wireless interface unit 11 notifies the power supply unit 12 to that effect and causes the wireless speaker 1 to transition to the normal power mode. Good. When Bluetooth is used as the wireless interface, the mode may be set to the Park mode or the Hold mode. Next, a case in which the wireless channel is set and disconnected by the operation of the main unit 2 will be described. First, when a certain wireless speaker 1 is separated from the main device 2 (see FIG. 3) and power supply from the main device 2 to the wireless speaker 1 is stopped, the main device 2 supplies power. In the unit 23, this is detected and information to that effect and information for identifying the wireless speaker 1 (in the case where there is only one wireless speaker 1, it is sufficient only to that effect. ) To the wireless interface unit 21. The wireless interface unit 21 that has received the first notification information attempts to establish a wireless connection with the main device 2 in order to establish a wireless channel with the wireless speaker 1. This procedure is performed for each wireless speaker 1 when there are a plurality of wireless speakers 1. On the other hand, when the wireless channel was established, a certain wireless speaker 1 was attached to the main unit 2 (see FIG. 1), and the power supply from the main unit 2 to the wireless speaker 1 was resumed. In the case of the main unit 2, the power supply unit 23 detects this and information to that effect and information for identifying the wireless speaker 1 (in the case where there is only one wireless speaker 1, it does not matter. ) Is notified to the wireless interface unit 21. The wireless interface unit 21 having received the second notification information disconnects the wireless channel with the wireless speaker 1. This procedure is performed for each wireless speaker 1 when there are a plurality of wireless 10-05-2019 6 speakers 1. In the above, the main unit 2 sets and disconnects the wireless channel with each wireless speaker 1 individually for each wireless speaker 1, but for example, all the wireless speakers 1 are separated. For the first time, the wireless channel is set with all the wireless speakers 1, and if at least one wireless speaker 1 is attached, the wireless channel is disconnected with all the wireless speakers 1. You may Further, for example, a group is set in advance by all or part of the wireless speakers 1 (for example, the speakers # 1 and # 2 are set to the group # 1, and the speakers # 1 to # 4 are set to the group # 2) Speakers # 1 to # 6 are group # 3), setting of wireless channels with all wireless speakers 1 belonging to a certain group only after all wireless speakers 1 belonging to the certain group are separated If, on the other hand, one of the wireless speakers 1 belonging to the certain group is attached, the wireless channel is cut off with all the wireless speakers 1 belonging to the certain group. Good. Alternatively, when one of the wireless speakers 1 belonging to the certain group is attached, if another group is formed by the wireless speakers 1 still separated, the wireless speakers 1 belonging to the other group The radio channel may be disconnected only for the other radio speakers 1. By the way, so far, the wireless speaker 1 has been described assuming that the wireless speaker 1 is not used when the wireless speaker 1 is attached to the main body side device 2. The wireless speaker 1 may be enabled even when attached. In the case of the present embodiment, for example, the audio data output of the AV decoding unit 22 of the main device 2 is simultaneously transmitted to the audio reproduction unit 13 of each wireless speaker 1 by the connection of the connection interface units 231 and 121 of FIG. It may be configured to be connected. As described above, according to the present embodiment, since the wireless channel between the wireless speaker and the apparatus on the main body side is constructed only when there is a possibility that audio is output, the power consumption of the wireless speaker can be reduced. It can be kept low. Second Embodiment Next, a second embodiment of the present invention will be described. In the first embodiment, the wireless channel between the wireless speaker and the main unit is constructed only when the battery of the wireless speaker is driven, but in the present embodiment, the reproduction control is performed when the battery of the wireless speaker is driven. Only when a specific event occurs, the setting and disconnection of the wireless channel between the wireless speaker and the device on the main body are performed. Here, a description will be given focusing on the setting / disconnection of radio channel different from the first embodiment. FIG. 5 shows a configuration example of the main body side device 2 of the content reproduction system according to the present embodiment. As shown in FIG. 5, the main body side device 2 of the present embodiment is obtained by adding an AV control unit 24 to the configuration example of FIG. 3. The wireless speaker 1 of this embodiment is the same as that of the first embodiment. In the present embodiment, it is assumed that the setting and disconnection of the wireless channel are performed by the main device 2. The AV control unit of the main unit 2 controls the reproduction of the AV content to be reproduced. For example, when the main unit 2 is a device corresponding to a DVD player, play , reverse play , stop , 10-05-2019 7 pause , n double speed forward play , n double speed direction speed It is conceivable that such events may occur when an input is made by pressing a button for designating play , next , front , first , last and the like. It is assumed that the radio channel is set in advance when any event occurs, and the radio channel is disconnected when any event occurs. Here, as an example, an event for reproducing contents such as "play" and "pause" is set as a first group of events, and when an event belonging to the first group occurs, a wireless channel is set, and "stop" , Etc. is regarded as a second group of events, and the radio channel is disconnected when an event belonging to the second group occurs. First, when a certain wireless speaker 1 is separated from the main device 2 (see FIG. 3) and power supply from the main device 2 to the wireless speaker 1 is stopped, the main device 2 supplies power. In the unit 23, this is detected and information to that effect and information for identifying the wireless speaker 1 (in the case where there is only one wireless speaker 1, it is sufficient only to that effect. ) To the wireless interface unit 21. On the other hand, when one of the events belonging to the first group occurs, for example, when the play button is pressed, the AV control unit 24 sends, to the wireless interface unit 21, the third notification information including that effect. Notice. The wireless interface unit 21 that has also received the third notification information in the state of receiving the first notification information wirelessly connects to the main device 2 to establish a wireless channel with the wireless speaker 1. Try. Then, after the wireless channel is established, voice data is transferred. This procedure is performed for each wireless speaker 1 when there are a plurality of wireless speakers 1. On the other hand, when the wireless channel was established, a certain wireless speaker 1 was attached to the main unit 2 (see FIG. 1), and the power supply from the main unit 2 to the wireless speaker 1 was resumed. In the case of the main unit 2, the power supply unit 23 detects this and information to that effect and information for identifying the wireless speaker 1 (in the case where there is only one wireless speaker 1, it does not matter. ) Is notified to the wireless interface unit 21. On the other hand, when any one of the events belonging to the second group occurs, for example, when the stop button is pressed, the AV control unit 24 sends, to the wireless interface unit 21, the fourth notification information including that effect. Notice. The wireless interface unit 21 that has also received the fourth notification information in the state of receiving the second notification information disconnects the wireless channel with the wireless speaker 1. This procedure is performed for each wireless speaker 1 when there are a plurality of wireless speakers 1. Here, the case has been described by way of example in which the main body side device 2 performs setting and setting of the wireless channel between each wireless speaker 1 and audio data transfer and disconnection individually for each wireless speaker 1. Of course, as described in the first embodiment, it is of course possible to uniformly carry out all the wireless speakers 1 or uniformly for each speaker group. In addition, various variations can be considered as to how to set an event. For example, an event causing transfer of audio data such as "play" and "1.5 double speed forward" is considered as a first group of events, "stop", "pause", "8 double speed forward" 10-05-2019 8 And the like may be set as the second group of events. Further, temporary stop may be regarded as the first group of events, and it may be regarded as occurrence of the second group of events when the temporary stop event continues for a certain period of time. In addition, when the content reproduction is changed from the silence state to the presence state, it is considered that the event of the first group is generated, and when the content reproduction is changed to the silence state, the second group It is also possible to consider that the event of has occurred. By the way, although the case where the wireless speaker 1 is not used when the wireless speaker 1 is attached to the main device 2 has been described above, the wireless speaker 1 is attached to the main device 2 The wireless speaker 1 may be made available even when it is being turned on. In the case of the present embodiment, for example, the audio data output of the AV decoding unit 22 of the main device 2 is simultaneously transmitted to the audio reproduction unit 13 of each wireless speaker 1 by the connection of the connection interface units 231 and 121 of FIG. It may be configured to be connected. Alternatively, in the above-described configuration, the wireless interface unit 21 may perform processing on the assumption that all the wireless speakers 1 are in the state of receiving the first notification information. As described above, according to the present embodiment, the wireless channel between the wireless speaker and the apparatus on the main body side is established only when the sound is output or only when the probability that the sound is output is high. The power consumption of the wireless speaker can be reduced. Third Embodiment Next, a third embodiment of the present invention will be described. In this embodiment, in the content reproduction system of the first embodiment or the second embodiment or the conventional content reproduction system having the same basic configuration, an image to be output on a display screen and an output from each wireless speaker Function to control voice and synchronization. FIG. 6 shows a configuration example of the wireless speaker 1 and the main body side device 2 of the content reproduction system according to the present embodiment. 6, only one wireless speaker 1 is illustrated, and the power supply unit 12, the audio reproduction unit 13, and the battery 14 are omitted. FIG. 6 exemplifies the case where the synchronous control of the present embodiment is applied to the first embodiment, and in the following, a description will be given focusing on the synchronous control that is different from the first embodiment. The same applies to the second embodiment and the conventional system. As shown in FIG. 6, the main body side device 2 of this embodiment is obtained by adding the synchronization control unit 25 to the configuration example of FIG. 3, and the wireless speaker 1 of this embodiment is shown in FIG. The reverse synchronization signal generation unit 15 is added to the configuration example. As the content, it is assumed that the synchronization between the video and one or more audios is controlled for the content including the video and the audio, but a plurality of the content is not for the video. It may control the synchronization 10-05-2019 9 between the voices of The AV decoding unit 22 of the main body side device 2 decodes the AV content and separates it into video data and audio data. Here, the synchronization control unit 25 of the main body side device 2 includes audio data wirelessly transmitted via the wireless interface portion 21 and reproduced by each wireless speaker 1 and the built-in internal body device 2 when the main body side device 2 incorporates a monitor. The synchronization information such as a time stamp for synchronizing with the video data to be displayed on the monitor or its peripheral device (for example, the monitor 3 as shown in FIG. 3 connected to the main body side device 2) is generated. The AV decoding unit 22 passes the audio data and the synchronization information to the wireless interface unit 21, and the wireless interface unit 21 superimposes the synchronization information on the audio data and transfers it to the wireless speaker 1. The reverse synchronization signal generation unit 15 of the wireless speaker 1 extracts synchronization information such as a time stamp from the audio data sent from the main body side device 2, and according to its own audio reproduction capability, the audio at which timing Can be reproduced, and as a result, the reverse synchronization signal generation unit 15 generates a control signal including information indicating the timing and feeds it back to the main body side device 2. For example, each wireless speaker 1 determines the timing at which the audio can be reproduced, taking into consideration the delay obtained by adding the transmission delay obtained from the time stamp and the delay due to the processing in the device stored beforehand. The main unit 2 receiving the reverse synchronization signal from each wireless speaker 1 passes them to the synchronization control unit 25, and the synchronization control unit 25 controls the display timing of the video content to be reproduced. Generally, on the side of reproducing the audio, a wireless transfer delay, a code, a delay of decoding, and the like are added, and a delay occurs from the reproduction of the video in the main apparatus 2 or its peripheral devices. There are many. Therefore, based on the reverse synchronization signal, the synchronization control unit 25 performs control to delay the reproduction timing of the video data in the main apparatus 2 or the peripheral device thereof. Next, referring to a specific example of FIG. 7, a case where all of the video and each audio are synchronized when the delays for the plurality of wireless speakers 1 are dispersed will be described. As illustrated in FIG. 7, it is assumed that one main unit 2 and four speakers 1 exist. Here, the transmission delay of the main device 2 is d0, and the transmission delays of the wireless speakers 1 of # 1 to # 4 are d1 to d4, respectively, and the reproduction delay of the video (mainly the delay due to the video decoding processing) is Let c1 to c4 be reproduction delays of audio in the wireless speakers 1 of c0 and # 1 to # 4 (mainly delays due to audio decoding processing). The following processing relating to synchronization control is performed by the synchronization control unit 25 of the main body side device 2, and the reverse synchronization signal generation unit 15 of the wireless speaker 1 may not be provided here. The AV decoding unit 22 of the main unit 2 decodes AV content (video source 8 in FIG. 7) and separates it into video data and audio data. Here, the synchronization control unit 25 of the main device 2 generates the synchronization information corresponding to each wireless speaker 1 by 10-05-2019 10 performing the following process. The synchronization control unit 25 passes synchronization information corresponding to each wireless speaker 1 to the wireless interface unit 21 prior to transfer of audio data, and the wireless interface unit 21 transfers corresponding synchronization information to each wireless speaker 1. . Then, after that, the AV decoding unit 22 passes the video data to the monitor, and transfers the audio data corresponding to each wireless speaker 1 to each wireless speaker 1 via the wireless interface unit 21. FIG. 8 shows an example of a processing procedure for generating and transferring synchronization information for synchronizing the video and each audio, by the synchronization control unit 25 of the main device 2. First, a delay DCi = di + ci (i is a number from 0 to the number of wireless speakers 1) relating to the own apparatus 2 and each wireless speaker 1 is obtained (step S1). In the specific example of FIG. 7, DC0 = d0 + c0 for own device 2, DC1 = d1 + c1 for wireless speaker 1 of # 1, DC2 = d2 + c2 for wireless speaker 1 of # 2, and wireless of # 3 DC3 = d3 + c3 is obtained for the speaker 1 and DC4 = d4 + c4 is obtained for the wireless speaker 1 of # 4. Here, the reproduction delay in the main device 2 and each wireless device 1 is measured in advance (for example, before shipment etc.), and each value is stored in the main device 2. Or stored in each device. In the former method, the stored reproduction delay value is read. In the case of the latter method, for the ones that have not yet received the transfer of the reproduction delay value from the wireless speaker 1 or those that have received the transfer but do not hold the value at this time, the corresponding wireless A request is issued to the speaker 1 to transfer the reproduction delay to the main device 2. The former method can be used, for example, when the main apparatus 2 and the wireless devices 1 are sold as a set. On the other hand, if the transmission delay from the main device 2 to each wireless device 1 can be grasped from the quality assurance mechanism in the communication system, it can be used, but if not so, It is possible to measure by transmitting and receiving control data (even when graspable). For example, a method of sending a packet for round tripping from the main device 2 to the wireless speaker 1, measuring the round trip time of the main body device 2, and setting the round trip time / 2 as the transmission delay, or With the wireless speaker 1, the clock is in the same state, and a packet describing the transmission time is transmitted from the main unit 2 to the wireless speaker 1, and the wireless speaker 1 transmits the transmission time described in the packet from the reception time of the packet. There is a method of subtracting the transmission delay and notifying it from the wireless speaker 1 to the main unit 2. Next, i (= n) satisfying the maximum delay Max (DCi) is obtained (step S2). In the case of the specific example of FIG. 7, an apparatus (usually, one of the wireless speakers 1) giving the maximum value among DC0 to DC4 is obtained. For example, it is assumed that the wireless speaker 1 of # 1 is determined to be a wireless speaker in which the maximum delay occurs (in this case, n = 1). Next, for each device, a difference value between the delay DCi and the delay DCn of the wireless speaker #n is determined (step S3). For example, in the case of n = 1, DC4-DCn are respectively determined from DC0-DCn. However, since the calculation result is 0 for the wireless speaker 1 of #n, the result may be set to 0 without performing this calculation. Then, the synchronization information 10-05-2019 11 indicating the above difference value is transferred to each wireless speaker 1 (step S4). Thus, the AV decoding unit 22 of the main device 2 passes the video data to the monitor, and transfers the audio data corresponding to each wireless speaker 1 to each wireless speaker 1 via the wireless interface unit 21. . Then, the AV decoding unit 22 of the main device 2 delays the time corresponding to the abovementioned difference value DC0 to DCn when reproducing the video, and the respective radios other than the wireless speaker 1 causing the maximum delay. The audio reproduction unit 13 of the speaker 1 operates to delay each time corresponding to the above difference value DCi-DCn when reproducing the audio, and the audio reproduction unit 13 of the wireless speaker 1 causing the maximum delay is immediately It operates to reproduce the audio, which allows the video and each audio to be synchronized. In step S 3, instead of obtaining DCi−DCn as the difference value, DCi− (DCn + α) may be obtained, and a fixed margin may be provided for the delay. In this case, the audio reproduction unit 13 of the wireless speaker 1 causing the maximum delay also operates to delay by an amount corresponding to the margin when reproducing the audio. Although the case has been described above in which the main apparatus 2 and the wireless speaker 1 are wirelessly connected, in the synchronization control of this embodiment, the main apparatus and the speaker are connected by wire ( The present invention is also applicable to the case where a speaker is incorporated in a device equivalent to the main device. In the first to third embodiments, the video reproduction apparatus has been described as the main apparatus, but the present invention is also applicable to an audio reproduction apparatus. The present invention is not limited to the above embodiment as it is, and at the implementation stage, the constituent elements can be modified and embodied without departing from the scope of the invention. In addition, various inventions can be formed by appropriate combinations of a plurality of constituent elements disclosed in the above embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, components in different embodiments may be combined as appropriate. According to the present invention, it is possible to reduce the consumption output of a mobile audio output device driven by a battery. Furthermore, according to the present invention, video and a plurality of audio can be synchronized. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a configuration example of a content reproduction system according to a first embodiment of the present invention. FIG. 2 is a wireless speaker and a power supply unit of a main body side device according to the same embodiment. FIG. 3 is a view showing an example of a connection interface unit. FIG. 3 is a view showing a configuration example of a main body side apparatus according to the embodiment. FIG. 4 is a view showing a configuration example of a wireless speaker according to the embodiment. FIG. 6 is a view showing a configuration example of a main body side device of a content reproduction system according to a second embodiment. FIG. 6 is a view showing a configuration example of a wireless speaker and a body side device according to a third embodiment of the present invention. FIG. 8 is a flowchart for explaining synchronization control in the embodiment; FIG. 8 is a flowchart showing an example of a 10-05-2019 12 processing procedure of a synchronization control unit of the main unit side apparatus according to the embodiment; Department , 12: power supply unit, 13: audio reproduction unit, 14: battery, 15: reverse synchronization signal generation unit, 2: main body device, 21: wireless interface unit, 22: AV decoding unit, 23: power supply unit, 24 ... AV control unit, 25 ... synchronization control unit, 3 ... monitor 10-05-2019 13
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