JP4315913B2 - Wireless transmission system and data transmission apparatus - Google Patents

Description

The present invention, by the radio data, such as audio or video, data transmitter for transmitting to the data receiving device, such as headphones or a head mounted display (hereinafter abbreviated as HMD) and a wireless transmission using the data transmission equipment of this About the system.

  Headphones that can provide audio only to a specific user when using an audio device or a television set for enjoying music or video in an environment where quietness is required, for example, at night. It has been performed conventionally. In recent years, HMDs that can provide not only audio but also video to only a specific user have been put into practical use.

  A conventional headphone or HMD is connected to an audio device or a television with a cable, receives data via the cable, and outputs audio or video to a small speaker or display. In this configuration, the length of the cable is about 1 m to 2 m, and there is a disadvantage that the range in which the user can move is limited to within the length of the cable, and the fact that the user moves because the cable exists. There was a drawback that it was difficult.

  On the other hand, a wireless transmission system capable of wirelessly transmitting data such as audio or video has been put into practical use by eliminating a cable between a headphone or an HMD or the like and an audio device or a television or the like. In Japan, data is transmitted using radio waves or infrared rays. However, a headphone or HMD that receives data transmitted from a wireless transmission system requires a storage means such as a battery or a battery in order to operate a receiving circuit and a speaker, and the power stored in the storage means is exhausted. In such a case, the battery cannot be used unless the battery is replaced or the battery is charged.

In Patent Document 1, in a headphone that receives wireless data, when a headphone band is made of metal and a headphone that is not in use is placed, the headphone's metal band is placed on the battery. There has been proposed a headphone device with a charging device that includes a charging device that can perform charging and that can easily charge a battery simply by placing the headphone on the charging device.
Japanese Utility Model Publication No. 2-141140

  However, in the headphone device with a charging device described in Patent Document 1, since the battery cannot be charged when the headphone is used, the headphone is used when the battery power is exhausted during use. There is a problem that there is a limit to the continuous use time.

  On the other hand, wireless power transmission devices that can transmit power wirelessly without using cables have been put into practical use. The wireless power transmission device includes a set of coils and a resonance circuit that are electromagnetically coupled to the power transmission unit and the power reception unit, respectively, and transmits electromagnetic waves between the coils to receive power at the resonance circuit. It is possible to transmit power wirelessly.

  By adopting the same configuration as the wireless power transmission device for headphones, HMDs, etc., data is transmitted from the audio device or television, and the power is transmitted, and the received power is used to output audio or video. In addition, when a battery is provided, the battery can be charged.

  However, since a headphone or HMD that receives data and receives power wirelessly is worn and used by a user, a transmitter such as an audio device or a television and a receiver such as a headphone or HMD are used in advance. It is difficult to predict the distance between them, and in particular, in the case of a headset, the user may move while wearing it, and the distance between the transmitting device and the receiving device changes during use. When the amount of power to be transmitted is set small, depending on the distance between the transmission device and the reception device, the output of audio or video output from the reception device cannot be increased, and the distance that the user can move is There is a problem of narrowing. When the amount of power to be transmitted is set large, the power consumption of the transmission device increases, and when the distance between the transmission device and the reception device is short, the power is wasted and there is a problem that the power usage efficiency is poor. When excessively large electric power is transmitted, there is a concern that the human body may be adversely affected by electromagnetic waves.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a data transmission device and a data reception device that wirelessly transmit data and power, and to vary the amount of electric power to be transmitted. Thus, an object of the present invention is to provide a wireless transmission system applicable to a headphone, an HMD, or the like, which can perform power transmission optimal for the usage state of the data transmission device and the data reception device.

  Another object of the present invention is to provide detection means for detecting the presence / absence of data to be transmitted by the data transmission device so as to charge the battery of the data reception device when data transmission is not performed. Increase the amount of power to be transmitted, or if the data receiver does not have a battery, perform power transmission that is optimal for usage conditions, such as not transmitting power at all when not transmitting data An object of the present invention is to provide a wireless transmission system capable of

  Another object of the present invention is to provide a determination means for determining the amount of power required for output based on data transmitted by the data transmitting device, so that the data to be transmitted is voice or video in the data receiving device. In the case where a large amount of power is required in the case of outputting in a similar manner, it is an object to provide a wireless transmission system capable of transmitting a larger amount of power wirelessly.

  Another object of the present invention is to provide a measuring means for measuring the distance between the data transmitting device and the data receiving device, so that power can be transmitted with an amount of electric power that is optimum for the distance to transmit power. An object of the present invention is to provide a wireless transmission system that can be used.

  Another object of the present invention is to provide a wireless transmission system capable of reducing the amount of data transmitted wirelessly by providing a compression means for compressing data transmitted by a data transmitting apparatus. There is.

  Another object of the present invention is to provide a wireless transmission system capable of reducing the amount of data to be transmitted wirelessly by providing the data receiving device with decompression means for decompressing the compressed data. There is to do.

  Another object of the present invention is to allow a single data transmission device to transmit data and transmit power to a plurality of data reception devices, thereby enabling wireless use by a plurality of users. It is to provide a transmission system.

  Another object of the present invention is to provide a data receiving device by installing a data receiving antenna and a power receiving antenna in a mounting portion for a user to mount on the data receiving device. The object is to provide a wireless transmission system that can be miniaturized.

  Another object of the present invention is to provide a data receiving antenna and a power receiving antenna in the form of a pancake coil, and include a plurality of sets of data receiving antennas and power receiving antennas. An object of the present invention is to provide a wireless transmission system including a data receiving device that is small in size and has high sensitivity for data reception and power reception.

  Another object of the present invention is to provide power transmission means for transmitting power wirelessly so that power can be applied to the power receiving side device, and the amount of power to be transmitted. It is an object to provide a data transmission device that can perform transmission of electric power that is optimal for the usage situation.

The wireless transmission system according to the present invention includes a power transmission unit that wirelessly transmits power, a data transmission device that wirelessly transmits data, and a power reception unit that receives the power transmitted by the power transmission unit. And a data receiving device that receives data transmitted by the data transmitting device, wherein the data transmitting device includes a changing unit that changes an amount of power transmitted by the power transmitting unit, and the data The receiving device has output means for outputting received data, the data transmitting device has detection means for detecting the presence / absence of data to be transmitted, and the data transmitting device is configured to output data based on data to be transmitted. Determining means for determining the amount of electric power required when outputting the signal, and the changing means includes the detection result of the detecting means and the determination result of the determining means. Characterized in that you have to change the amount of power in accordance with the.
Wireless transmission system according to or the invention, the data receiving device has a rechargeable battery for storing electric power, electric energy when it is detected that there is no data to be transmitted by the detecting means, transmits The change means changes the amount of power so that the amount of power is greater than when it is detected that there is data to be performed.

In the present invention, the amount of electric power transmitted wirelessly by the power transmission means provided in the data transmission device is made variable in accordance with the usage status of the device to improve the power utilization efficiency. In addition, when the data transmission device includes detection means for detecting the presence or absence of data to be transmitted, the amount of power transmitted by the power transmission means is changed according to the detection result of the detection means, and data is not transmitted Increases the amount of power transmitted to charge the battery of the data receiving device, or if the data receiving device does not have a battery, it does not transmit power at all when data is not transmitted, etc. The power transmission that is most suitable for the use situation. In addition, a determination unit that determines the amount of power required for output based on data transmitted by the data transmission device is provided, and a large amount of power is required when the data to be transmitted is output as audio or video by the data reception device. If so, more power is transmitted wirelessly, and power transmission optimal for the amount of power consumed by the data receiving device is performed .

  The wireless transmission system according to the present invention is characterized in that the data transmission device has compression means for compressing data, and the data compressed by the compression means is transmitted wirelessly.

  In the present invention, a compression means for compressing data transmitted by the data transmitting apparatus is provided to reduce the amount of data transmitted from the data transmitting apparatus to the data receiving apparatus.

  Also, the wireless transmission system according to the present invention is characterized in that the data receiving device has expansion means for expanding the received compressed data.

  In the present invention, the data receiving device includes decompression means for decompressing the compressed data to reduce the amount of data transmitted from the data transmitting device to the data receiving device.

  The wireless transmission system according to the present invention includes a plurality of the data receiving devices, and the data transmitting device transmits data and power to the plurality of data receiving devices.

  In the present invention, one data transmitting apparatus can transmit data and transmit power to a plurality of data receiving apparatuses, and a plurality of users can simultaneously receive data and receive power.

  In the wireless transmission system according to the present invention, the data receiving device includes a mounting unit for a user to wear, and a data receiving antenna for receiving data and a power receiving antenna for receiving power. It equips with the said mounting part, It is characterized by the above-mentioned.

  According to the present invention, the data receiving device is miniaturized by providing the data receiving device and the power receiving antenna in the mounting portion that the user provided in the data receiving device wears.

  Further, in the wireless transmission system according to the present invention, the data receiving antenna and the power receiving antenna have a pancake coil shape, and the mounting portion includes a plurality of sets of the data receiving antenna and the power receiving antenna. Features.

  In this invention, the data receiving antenna and the power receiving antenna are in the form of a pancake coil, and a plurality of sets of data receiving antennas and power receiving antennas are provided. Increase the sensitivity of power reception.

Further, the data transmission device according to the present invention is a data transmission device that transmits data wirelessly, and a detection means that detects presence / absence of data to be transmitted and power required when transmitting data based on the data to be transmitted. A determination unit for determining the amount, a power transmission unit for transmitting power wirelessly, and a power amount of the power transmitted by the power transmission unit according to a detection result of the detection unit and a determination result of the determination unit And a changing unit .

  In the present invention, power transmission means for transmitting power wirelessly is provided, the amount of power to be transmitted is made variable, power transmission optimal for the usage situation is performed, and the device on the power receiving side is operated.

  In the case of the present invention, it is possible to improve the power use efficiency by changing the amount of power transmitted by the power transmission means provided in the data transmission device wirelessly according to the usage status of the device. Thus, an increase in power consumption of the data transmitting apparatus can be suppressed, and an output when the data received by the data receiving apparatus is output as audio or video can be increased.

  In addition, according to the present invention, the data transmission device includes detection means for detecting the presence or absence of data to be transmitted, and data transmission is performed by changing the amount of power transmitted according to the detection result of the detection means. If not, increase the strength of the power to be transmitted to charge the battery of the data receiving device, or if the data receiving device is not equipped with a battery, no power is transmitted when no data is transmitted Therefore, it is possible to improve the power use efficiency because it is possible to perform power transmission optimal for the usage conditions.

  Further, in the case of the present invention, when the data to be transmitted is output as audio or video in the data receiving device by including a determination unit that determines the amount of power required for output based on the data transmitted by the data transmitting device. When a large amount of power is required, more power can be transmitted wirelessly, so that the data receiving apparatus can output the received data as high-quality audio or video.

  In addition, according to the present invention, since a measurement unit that measures the distance between the data transmission device and the data reception device is provided, power can be transmitted with the optimum amount of power for the transmission distance. Can use the device while moving.

  Further, in the case of the present invention, the data amount of data transmitted between the data transmission device and the data reception device can be reduced by providing the compression means for compressing the data transmitted by the data transmission device. Can be transmitted at high speed.

  Further, according to the present invention, since the data receiving device includes decompression means for decompressing the compressed data, the amount of data transmitted between the data transmitting device and the data receiving device can be reduced. Data transmission can be performed at high speed.

  Also, according to the present invention, by enabling one data transmission device to transmit data and transmit power to a plurality of data reception devices, it is possible for a plurality of users to enjoy music or video simultaneously at the same time. it can.

  Further, according to the present invention, the data receiving device can be reduced in size by providing the data receiving device and the power receiving antenna in the mounting portion that the user provided in the data receiving device wears. Therefore, the data receiving device can be easily used.

  Further, according to the present invention, the data receiving antenna and the power receiving antenna are in the form of a pancake coil, and a plurality of sets of data receiving antennas and power receiving antennas are provided. The size can be reduced, and the sensitivity of data reception and power reception of the data reception device can be increased, so that the user can enjoy high-quality music or video.

  In the case of the present invention, since the power transmission device that wirelessly transmits power can be provided to operate the power receiving device, the battery of the power receiving device is automatically charged. It is possible to perform the operation even if the receiving apparatus is not equipped with a battery or a battery. In addition, since the power usage efficiency can be improved by changing the amount of power to be transmitted according to the usage status, an increase in power consumption of the data transmission device can be suppressed.

  Further, in the case of the present invention, the battery can be charged automatically or can be operated without being equipped with a battery by providing power receiving means for receiving the power transmitted wirelessly. , Making it easier for users to use.

  In the case of the present invention, the data receiving device can be downsized by providing a mounting portion for a user to mount with a plurality of pancake coil-shaped data receiving antennas and power receiving antennas. Therefore, the user can easily use it, and the sensitivity of data reception and power reception can be increased, so that the user can enjoy high-quality music or video.

Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof.
(Embodiment 1)
The first embodiment relates to an audio system, and includes an audio device that transmits data wirelessly and a headphone that receives the data transmitted wirelessly. FIG. 1 is a perspective view of a headphone according to Embodiment 1 of the present invention. In the figure, reference numerals 1 and 1 denote audio output units, and the audio output units 1 and 1 are fixed and supported at both ends of an inverted U-shaped mounting unit 2 for a user to mount on the head. The mounting unit 2 includes a plurality of data receiving antennas 3 for receiving wireless data and a plurality of power receiving antennas 4 for receiving power. The data receiving antenna 3 and the power receiving antenna 4 are both pancake coils. Shape.

  FIG. 2 is a block diagram showing the configuration of the audio apparatus according to Embodiment 1 of the present invention, and FIG. 3 is a block diagram showing the configuration of the headphones according to Embodiment 1 of the present invention. In the figure, reference numeral 10 denotes an audio device. The audio device 10 transmits audio data to the headphones 30 wirelessly and transmits power wirelessly. The headphone 30 receives the audio data transmitted from the audio device 10 by radio by the data receiving antenna 3, and receives the electric power transmitted by radio by the power receiving antenna 4.

  The audio device 10 includes a CD drive 17. The CD drive 17 reads audio data from a CD-ROM 20 that is a recording medium, and gives audio data to the compression unit 18 when a user listens to audio using the headphones 30. Otherwise, audio data is given to the D / A conversion circuit 21. The D / A conversion circuit 21 converts the digital audio data into an analog audio signal and applies the analog audio signal to the signal amplification circuit 22, and the signal amplification circuit 22 amplifies the applied audio signal and outputs it from the speaker 23. The compression unit 18 compresses the given audio data by a compression / expansion method such as WMA or MP3, and gives the compressed audio data to the data transmission circuit 19. The data transmission circuit 19 includes a data transmission antenna 25, converts received audio data into a high frequency signal, and transmits the high frequency signal from the data transmission antenna 25 to the data reception antenna 3 provided in the headphones 30.

  The control unit 15 provided in the audio device 10 controls the amount of power transmitted from the audio device 10 to the headphones 30, and the inter-musical distance and distance measuring unit 16 of the audio data detected by the inter-musical detection unit 14 The amount of power is determined from the distance between the audio device 10 to be measured and the headphones 30. The inter-song detecting unit 14 detects a silence state of the audio data from the audio data read by the CD drive 17, that is, a so-called inter-song between the songs recorded on the music CD or the music MD, and controls the detection result. To part 15. The distance measuring unit 16 receives the infrared light from the infrared light emitting unit 33 provided in the headphone 30, measures the distance between the audio device 10 and the headphone 30 from the intensity of the received infrared light, and is a distance as a measurement result. Information is given to the control unit 15.

  The control unit 15 controls the power amplifier circuit 12 and the power transmission circuit 13 to apply power to the headphones 30 wirelessly while changing the amount of power. The power amplifier circuit 12 amplifies the power supplied from the power supply circuit 11 to the amount of power determined by the control unit 15 and supplies the power to the power transmission circuit 13. The power transmission circuit 13 includes a power transmission antenna 24, generates a pulse signal from the power supplied from the power amplification circuit 12, and receives the pulse signal from the power transmission antenna 24 as an electromagnetic wave to the power receiving antenna provided in the headphones 30. Power is transmitted to 4.

  The headphone 30 includes a power receiving circuit 31 for receiving power transmitted from the audio device 10 wirelessly. The power receiving circuit 31 includes the power receiving antenna 4 and a resonance circuit (not shown). The power receiving antenna 4 receives an electromagnetic wave transmitted from the power transmitting antenna 24 of the audio device 10 and converts the electromagnetic wave into a pulse signal by the resonance circuit. The data is restored and given to the rectifier circuit 32. The rectifier circuit 32 converts the pulse signal into a DC voltage and supplies it to the power supply circuit 34.

  The power supply circuit 34 is supplied with power from the rectifier circuit 32 and the secondary battery 35, and the supplied power is converted into an infrared light emitting unit 33, a data receiving circuit 36, a data buffer 37, a decoder 38, a D / A conversion circuit 39, Each part is operated by giving it to the signal amplifier circuit 40 and the audio output unit 1. The power supply circuit 34 normally supplies the power from the rectifier circuit 32 to each unit, and when the power supply from the rectifier circuit 32 is interrupted, supplies the power from the secondary battery 35 to each unit. In addition, when the amount of power supplied from the rectifier circuit 32 is equal to or greater than the amount of power required to operate each unit, the secondary battery 35 can be charged with surplus power.

  The infrared light emitting unit 33 emits infrared light toward the distance measuring unit 16 of the audio device 10 in order to measure the distance between the audio device 10 and the headphone 30. The data reception circuit 36 includes a data reception antenna 3, receives compressed audio data transmitted from the data transmission circuit 19 of the audio device 10 from the data reception antenna 3, and stores the received audio data in the data buffer 37. The decoder 38 reads out the audio data stored in the data buffer 37, decodes the compressed audio data and applies it to the D / A conversion circuit 39. The D / A conversion circuit 39 converts the digital audio data into an analog audio signal. The signal is converted and applied to the signal amplifier circuit 40. The signal amplifying circuit 40 amplifies the given audio signal, gives it to the audio output unit 1, and outputs audio from a speaker (not shown) provided in the audio output unit 1.

  FIG. 4 is a flowchart showing power control processing performed by the control unit 15 of the audio apparatus 10 according to Embodiment 1 of the present invention. When the reproduction of the audio data is started, the control unit 15 acquires distance information indicating the distance between the audio device 10 and the headphone 30 from the distance measurement unit 16 (step S1), and the power of the electric power transmitted according to the distance An amount is set (step S2). Next, it is determined from the detection result of the inter-song detection unit 14 whether or not the audio data is between silent songs (step S3). If the audio data is between songs (S3: YES), the headphone 30 is determined. In order to charge the secondary battery 35, the power amount is set to a large value again (step S4). If the audio data is not between songs (S3: NO), the process proceeds to the next step S5.

  After the setting of the amount of power is completed, the amount of power set from the power transmission circuit 13 is transmitted (step S5). Next, it is checked from the detection result of the inter-song detection unit 14 whether or not there is a change in the state of the audio data, that is, whether it has changed from music to music or from music to music (step S6). If there is no change in the state of the audio data (S6: NO), the process returns to step S5 to transmit the set amount of power. If there is a change in the state of the audio data (S6: YES), it is checked whether or not the reproduction of the audio data has ended (step S7). If the reproduction has not ended (S7: NO), step S1 When the return power transmission is continued and the regeneration is completed (S7: YES), the power transmission is terminated.

  In the wireless transmission system having the above configuration, audio data can be transmitted from the audio device 10 to the headphone 30 and power can be transmitted, and the headphone 30 is provided between songs recorded on the music CD. The secondary battery 35 can be charged automatically. FIG. 5 is a timing chart showing a processing example of power transmission in the wireless transmission system according to Embodiment 1 of the present invention.

  In FIG. 5, (A) is audio data, and a1 section, a3 section, and a5 section indicate songs, a2 and a4 sections are between songs, and a6 section indicates a playback end state. (B) is the distance between the audio device 10 and the headphone 30, and shows that the distance is larger at the point b2 than at the point b1, for example. (C) shows the amount of power transmitted by the audio device 10.

  When the reproduction of the audio data is started, the distance measurement unit 16 acquires the distance information b1, sets the power amount c1 according to b1, and transmits power. When the music a1 ends and the audio data changes between the songs a2, the distance information b2 is acquired and set to a large amount of power c2 for charging according to b2, and power is transmitted. When the audio data changes from the song a2 to the song a3, the distance information b3 is acquired and set to the power amount c3 corresponding to b3, and the power is transmitted. The same processing is performed in the case of the song a4 and the song a5. In the reproduction end state a6, power transmission is stopped.

  In the present embodiment, the configuration in which audio data is transmitted by radio waves is shown. However, other means may be used, for example, a configuration in which infrared data is used for transmission. In addition, although the data to be transmitted is digital voice data, it may be analog voice data, and the digital voice data to be transmitted is compressed. However, the data may be not compressed. Further, the recording medium on which the audio data is recorded is the CD-ROM 20, but the recording medium is not limited to this, and may be an MD, a DVD, a semiconductor memory, or the like. Moreover, although the structure which measures the distance between the audio apparatus 10 and the headphones 30 using infrared rays was shown, not only this but the headphones 30 transmitted the ultrasonic wave, for example, and the audio apparatus 10 received Other configurations such as measuring the distance from the intensity of the ultrasonic wave may be used. Moreover, the structure which measures the distance from the infrared rays emitted from the user with which the headphones 30 were mounted | worn without the infrared light emission part 33 which light-emits infrared rays in the headphones 30 may be sufficient.

(Embodiment 2)
The second embodiment also relates to an audio system, and includes an audio device that transmits data wirelessly and a headset that receives the data transmitted wirelessly. FIG. 6 is a block diagram showing a configuration of a headphone according to Embodiment 2 of the present invention. In the figure, reference numeral 30a denotes a headphone, and the headphone 30a has a configuration in which the headphone 30 of the wireless transmission system according to the first embodiment does not include the secondary battery 35. Since the headphone 30a does not include a secondary battery, the power supply circuit 34a uses only the power supplied from the rectifier circuit 32 for the infrared light emitting unit 33, the data receiving circuit 36, the data buffer 37, the decoder 38, the D / A conversion circuit 39, Each part is operated by giving it to the signal amplifier circuit 40 and the audio output unit 1.

  In the wireless transmission system according to the present embodiment, the distance between the audio device 10 and the headphone 30a is always checked, and the amount of power transmitted is changed according to the change in the distance. FIG. 7 is a flowchart showing power control processing performed by the control unit 15 of the audio apparatus 10 according to Embodiment 2 of the present invention.

  When the reproduction of the audio data is started, the control unit 15 acquires distance information indicating the distance between the audio device 10 and the headphone 30a from the distance measurement unit 16 (step S21), and the power of the electric power transmitted according to the distance The amount is set (step S22). Next, it is determined from the detection result of the inter-song detection unit 14 whether or not the audio data is between silent songs (step S23). If the audio data is not between songs (S23: NO), the set power amount Is transmitted from the power transmission circuit 13 (step S24), and if the audio data is between songs (S23: YES), the process proceeds to step S25 without transmitting power. Next, it is checked whether or not the reproduction of the audio data has been completed (step S25). If the reproduction has not been completed (S25: NO), the process returns to step S21 to continue power transmission. When the reproduction is finished (S25: YES), the power transmission is finished.

  In the wireless transmission system according to the second embodiment having the above-described configuration, the distance between the audio device 10 and the headphone 30a is always checked, and the amount of power transmitted is changed in accordance with the change in distance. Therefore, the power utilization efficiency can be increased. FIG. 8 is a timing chart showing a processing example of power transmission in the wireless transmission system according to Embodiment 2 of the present invention.

  In FIG. 8, (A) is audio data, (B) is the distance between the audio device 10 and the headphones 30a, and (C) shows the amount of electric power transmitted by the audio device 10. In the a1 section, a3 section, and a5 section in which the audio data is song data, the electric energy changes according to the distance, the a2 section and a4 section in which the audio data is between songs, and the playback end state a6. No power is transmitted in the section.

  In addition, in this Embodiment, although the structure which does not provide a secondary battery in the headphones 30a was shown, it is good also as a structure provided with a secondary battery.

  The other configuration of the wireless transmission system according to Embodiment 2 is the same as that of the wireless transmission system according to Embodiment 1, and thus the same components are denoted by the same reference numerals and detailed description thereof is omitted.

(Embodiment 3)
The third embodiment is a wireless transmission system including a moving image reproducing apparatus that wirelessly transmits audio and video data, and an HMD that receives and outputs wirelessly transmitted audio and video data. FIG. 9 is a perspective view of an HMD according to Embodiment 3 of the present invention.

  In the figure, 50 and 50 are HMD audio output units, and 51 is a video output unit. The sound output units 50 and 50 are provided with a speaker (not shown) that outputs sound. Further, the video output unit 51 includes a display element (not shown) made of liquid crystal or organic EL, and a lens (not shown) for enlarging the video displayed on the display element, and displays images such as still images and moving images. Can be provided to the user. The audio output units 50 and 50 and the video output unit 51 are fixed and supported by an annular mounting unit 53 to be mounted on the user's head. Inside the mounting unit 53, pancake coil-shaped data is provided. A plurality of receiving antennas 54 and power receiving antennas 55 are provided.

  FIG. 10 is a block diagram showing the configuration of the moving image playback apparatus according to Embodiment 3 of the present invention, and FIG. 11 is a block diagram showing the configuration of the HMD according to Embodiment 3 of the present invention.

  In the figure, reference numeral 60 denotes a moving image reproducing device, and the moving image reproducing device 60 has a function of wirelessly transmitting moving image data and transmitting power to the HMD 80. A reading unit 64 provided in the moving image reproduction device 60 reads moving image data compressed by a compression / decompression method such as MPEG2, MPEG4, or motion JPG from a recording medium 65 such as a DVD, a Blu-ray disc, or an HDD. The reading unit 64 gives the read moving image data to the data transmission circuit 19 when the user views the moving image data using the HMD 80, and externally connected to the moving image reproducing device 60 without using the HMD 80. When viewing the moving image data using the display device 100, it is given to the decoder 66. The data transmission circuit 19 includes a data transmission antenna 25, converts the given moving image data into a high-frequency signal, and transmits the high-frequency signal to the HMD wirelessly. The decoder 66 decompresses the compressed moving image data and supplies the decompressed moving image data to the D / A conversion circuit 67, and the D / A conversion circuit 67 converts the digital moving image data into analog video signals and audio signals and supplies them to the output unit 68. An external display device 100 can be connected to the output unit 68, and a video signal and an audio signal are given to the display device 100 to display a moving image on the display device 100.

  The control unit 62 provided in the video playback device 60 controls the amount of power transmitted from the video playback device 60 to the HMD 80, and the brightness and distance measurement unit 63 of the video data determined by the brightness determination unit 61 measures the power. The amount of power is determined from the distance between the moving image playback device 60 and the HMD 80, and the power from the power supply circuit 11 is transmitted to the HMD 80 by the power amplifier circuit 12, the power transmission circuit 13, and the power transmission antenna 24.

  The brightness determination unit 61 determines the brightness of the video from the moving image data read by the reading unit 64, and provides the control unit 62 with the brightness information that is the determination result. The amount of power transmitted according to the brightness of the video is changed because the amount of power consumed by the video output unit 51 of the HMD 80 differs depending on the brightness of the video. For example, when transmitting dark video data with low brightness Sets a large amount of power.

  The distance measuring unit 63 receives the infrared light from the infrared light emitting unit 81 provided in the HMD 80, measures the distance between the moving image playback device 60 and the HMD 80 from the intensity of the received infrared light, and obtains distance information as a measurement result. This is given to the control unit 62. Further, the distance measuring unit 63 can receive and distinguish a plurality of infrared rays having different wavelengths, and can receive the infrared rays from the plurality of HMDs 80 and measure each distance. In this case, the distance of the farthest HMD 80 is given to the control unit 62 as distance information.

  The HMD 80 receives the power transmitted from the video playback device 60 by the power receiving circuit 31 and the power receiving antenna 55, and converts it into a DC voltage by the rectifier circuit 32. Power is supplied from the rectifier circuit 32 and the secondary battery 35 to the power supply circuit 82, and the supplied power is converted into an infrared light emitting unit 81, a data receiving circuit 36, a data buffer 83, a decoder 84, a D / A conversion circuit 85, Each unit is operated by giving it to the video output unit 51 and the audio output unit 50. The power supply circuit 82 normally supplies the power from the rectifier circuit 32 to each unit, and when the power supply from the rectified current is interrupted, supplies the power from the secondary battery 35 to each unit. In addition, when the amount of power supplied from the rectifier circuit 32 is equal to or greater than the amount of power required to operate each unit, the secondary battery 35 can be charged with surplus power.

  The infrared light emitting unit 81 emits infrared light for measuring the distance between the moving image playback device 60 and the HMD 80. In order to distinguish between the plurality of HMDs 80, the infrared light emitting unit 81 can change the frequency of infrared rays, and the frequency is changed by a user using a changeover switch (not shown).

  The data receiving circuit 36 includes a data receiving antenna 54, receives the moving image data transmitted from the moving image playback device 60, and stores it in the data buffer 83. The decoder 84 reads the moving image data from the data buffer 83, decodes the compressed moving image data, and supplies the decoded moving image data to the D / A conversion circuit 85. The D / A conversion circuit 85 converts the digital moving image data into an analog video signal and audio signal. Then, the video signal is supplied to the video output unit 51 and the audio signal is supplied to the audio output unit 50. The video is output by the video output unit 51 and the audio is output by the audio output unit 50, so that the user can enjoy the moving image.

  FIG. 12 is a flowchart showing power control processing performed by the control unit 62 of the video playback device 60 according to Embodiment 3 of the present invention. When the reproduction of the moving image data is started, the control unit 62 acquires distance information indicating the distance between the moving image recording apparatus 60 and the HMD 80 from the distance measuring unit 63 (step S41), and indicates the brightness of the video of the moving image data to be transmitted. Lightness information is acquired from the lightness determination unit 61 (step S42). Next, the amount of power to be transmitted is set according to the acquired distance information and lightness information (step S43), and the amount of power set by the power amplifier circuit 12 and the power transmission circuit 13 is transmitted (step S44). ). After the power is transmitted, it is checked whether or not the reproduction of the moving image data is finished (step S45). If the reproduction is not finished (S45: NO), the process returns to step S41 and the power transmission is continued. If regeneration is complete (S45: YES), power transmission is terminated.

  In the wireless transmission system according to the third embodiment having the above-described configuration, the power of the amount of power matched to the power consumed by the video output unit 51 of the HMD 80 is transmitted by determining the brightness of the moving image data to be transmitted. Therefore, the power use efficiency can be increased. FIG. 13 is a timing chart showing a processing example of power transmission in the wireless transmission system according to Embodiment 3 of the present invention.

  In FIG. 13, (A) is the brightness of the video of the moving image data. For example, the a11 section is lower in brightness than the a12 section, that is, a dark video. The moving image data is reproduced from the a11 section to the a18 section, and the a19 section indicates that the reproduction of the moving image data is finished. (B) is a distance between the moving image reproducing device 60 and the HMD 80, and shows a case where moving image data is transmitted to the two HMDs 80. The distance between the moving image playback device 60 and one HMD 80 is denoted by B1, and the distance between the other HMD 80 is denoted by B2. (C) shows the amount of electric power transmitted by the video playback device 60.

  Since the power consumed by the video output unit 51 of the HMD 80 is larger as the brightness of the video is lower, the amount of power to be transmitted is set higher when the brightness of the video is low. In addition, the amount of electric power is changed according to the distance between the moving image reproducing device 60 and the two HMDs 80, which is farther away. Power transmission is not performed in the a19 section when the reproduction of the moving image is completed.

  In the present embodiment, the power amount is determined according to the farthest distance when the power amount is determined from the distance between the video playback device 60 and the plurality of HMDs 80. However, the present invention is not limited to this. Instead, the amount of power may be determined according to the closest distance or the average value of the distances.

  Since the other configuration of the wireless transmission system according to Embodiment 3 is the same as that of the wireless transmission system according to Embodiment 2, the same components are denoted by the same reference numerals and detailed description thereof is omitted.

1 is a perspective view of a headphone according to Embodiment 1 of the present invention. It is a block diagram which shows the structure of the audio apparatus which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of the headset which concerns on Embodiment 1 of this invention. 5 is a flowchart showing power control processing performed by the control unit of the audio apparatus according to Embodiment 1 of the present invention. It is a timing chart which shows the process example of the electric power transmission of the wireless transmission system which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of the headphones which concern on Embodiment 2 of this invention. It is a flowchart which shows the process of the power control which the control part of the audio apparatus which concerns on Embodiment 2 of this invention performs. It is a timing chart which shows the process example of the electric power transmission of the wireless transmission system which concerns on Embodiment 2 of this invention. It is a perspective view of HMD which concerns on Embodiment 3 of this invention. It is a block diagram which shows the structure of the moving image reproduction apparatus which concerns on Embodiment 3 of this invention. It is a block diagram which shows the structure of HMD which concerns on Embodiment 3 of this invention. It is a flowchart which shows the process of the power control which the control part of the moving image reproduction apparatus which concerns on Embodiment 3 of this invention performs. It is a timing chart which shows the example of a process of the electric power transmission of the radio | wireless transmission system which concerns on Embodiment 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,50 Audio | voice output part 2,53 Mounting part 3,54 Data receiving antenna 4,55 Electric power receiving antenna 10 Audio apparatus 12 Power amplifier circuit 13 Electric power transmission circuit 14 Song detection part 15,62 Control part 16,63 Distance measuring part DESCRIPTION OF SYMBOLS 18 Compression part 19 Data transmission circuit 24 Electric power transmission antenna 25 Data transmission antenna 30, 30a Headphone 31 Electric power reception circuit 33 Infrared light emission part 36 Data reception circuit 38, 84 Decoder 51 Video output part 60 Movie reproducing apparatus 61 Brightness determination part 80 HMD

Claims (8)

A data transmission device having power transmission means for transmitting power wirelessly and transmitting data wirelessly;
In a wireless transmission system having a power receiving means for receiving power transmitted by the power transmitting means, and a data receiving apparatus for receiving data transmitted by the data transmitting apparatus,
The data transmission device has a changing means for changing the amount of power transmitted by the power transmitting means,
The data receiving device has output means for outputting received data,
The data transmission device has detection means for detecting the presence or absence of data to be transmitted,
The data transmission device includes a determination unit that determines an amount of power required when the output unit outputs data based on data to be transmitted;
The wireless transmission system according to claim 1, wherein the changing means changes the amount of electric power according to a detection result of the detection means and a determination result of the determination means. The data receiving device has a secondary battery for storing electric power,
The change means changes the power amount so that the power amount when the detection means detects that there is no data to be transmitted is larger than the power amount when it is detected that there is data to be transmitted. The wireless transmission system according to claim 1 . Wherein the data transmission device comprises a compression means for compressing the data, the wireless transmission system according to claim 1 or claim 2 are so as to transmit the data to the compression means is compressed by wireless. The wireless transmission system according to any one of claims 1 to 3 , wherein the data receiving device includes decompression means for decompressing the received compressed data. A plurality of the data receiving devices,
The wireless transmission system according to any one of claims 1 to 4 , wherein the data transmitting device transmits data and power to a plurality of the data receiving devices. The data receiving device has a mounting portion for a user to wear,
The wireless transmission system according to any one of claims 1 to 5 , wherein the mounting unit includes a data receiving antenna for receiving data and a power receiving antenna for receiving power. The data receiving antenna and the power receiving antenna have a pancake coil shape,
The wireless transmission system according to claim 6 , wherein the mounting unit includes a plurality of sets of the data receiving antenna and the power receiving antenna. In a data transmission device that transmits data wirelessly,
Detecting means for detecting the presence or absence of data to be transmitted;
Determining means for determining the amount of power required when transmitting data based on the data to be transmitted;
Power transmission means for transmitting power wirelessly;
A data transmission apparatus comprising: a changing unit that changes an amount of power transmitted by the power transmission unit according to a detection result of the detection unit and a determination result of the determination unit.

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