JP5412663B2 - Hi-Vision transceiver - Google Patents

Description

The present invention relates to a technical field of a transceiver that performs high-definition transmission from a device having an HDMI output (high-definition video camera, high-definition player, PC, etc.) to a device having an HDMI input (high-definition display, PC projector, PC, etc.). It is.
(Note) HDMI is an abbreviation for High-Definition Multimedia Interface.

High-definition broadcasting begins with BS digital broadcasting, and terrestrial digital broadcasting begins in December 2003. At the end of 2006, it became available for reception at the prefectural government offices in Japan. It has spread all the way. Also, since 2006, small and lightweight high-definition cameras have become widespread, and it has become an era where high-quality high-definition images can be taken and viewed at home. A simple environment in which such high-definition video is transmitted to a remote place or a two-way video conference is desired. For example, the use of HDTV is expected for various applications such as telemedicine cyber hospitals and remote monitors for safety and security.
In the transmission of high-definition video, an attempt was first made to convert an i-link (IEEE 1394) MPEG2-TS signal from a high-definition camera to a remote place by converting the IP into a PC or a dedicated device. This method has a drawback that a time delay occurs due to conversion to i-link or software processing. However, such slight delay is a quality that can be used for broadcast-type applications. However, high-definition transmission without delay is expected in telemedicine such as interactive conferences and cyber hospitals. Recently, small and light high-definition cameras, DVD / BD players / recorders, game machines such as the pre-station 3 and the like equipped with an HDMI terminal have been widely used for interconnection. The HDMI cable used for connection between the HDMI terminals needs to be able to transmit a high-speed digital video signal while maintaining high quality, and is limited to the transmission over a short distance of about 5 m. An environment that can be fully satisfied for enjoying high-definition television in the home has been established, and it has become widespread from high-vision enthusiasts to ordinary households.
Broadcasting high-definition equipment is still quite expensive. Hi-vision cameras and high-definition BD recorders that are also sold at home appliance stores such as the above will cost around 100,000 yen, and the signals from the HDMI terminal can be used to transmit and use such high-definition signals bidirectionally. Expectations for long-distance transmission equipment are growing.

HDMI is becoming mainstream in the connection between high-definition video devices that have been spread in this way. The HDMI terminals are physically ± TMDS-clock, three uncompressed high-definition video signals and digital audio ± TMDS-0, ± TMDS-1, ± TMDS-2, 8 pins, ± CEC, ± SCL, ± SDA 6 It is composed of a total of 19 terminals in which a spare is added to a total of 18 lines, a DDC / CEC ground line, an HPD hot plug detection line, a power line, and a ground line. Normally, this 19-terminal connection is electrically connected by an HDMI cable. Therefore, the HDMI cable requires an HDMI cable that transmits an ultra-high-speed digital signal and a low-speed electric signal at the same time. The configuration of the cable is complicated, the transmission distance is limited, and transmission to a remote place is impossible. In the above description of the terminals, the description is made along the terminals of the actual HDMI connector, but in the following, the symbols of the differential signals are omitted.
CECs other than the above TMDS are display control signals connected via HDMI, SCL and SDA are display data channel (DDC) signals used to detect EDID-ROM signals for device recognition built in the display, and hot plug detection (HPD) There is a signal. This HPD is used to determine whether or not the EDID-ROM of the device can be read even during standby.
(Note) TMDS: Transition Minimized Differential Signaling, 10-bit TMDS signal (165 Mpixels / sec)
CEC: Consumer Electronics Control
SCL: Serial Clock for DDC
SDA: Serial Data for DDC
EDID: Extended Display Identification Data
DDC: Display Data Channel
HPD: Hot Plug Detector signal

In the conventional HDMI transmission, as shown in FIG. 1, electrical wiring is connected by HDMI cables 5 and 6.
Here, 1 and 4 are transmitting devices such as a video camera and a high-definition player, and 2 and 3 are receiving devices such as a display and a PC. The 5 and 6 HDMI cables are configured by electrical wiring, and it is difficult to transmit long distances while maintaining uncompressed high-definition transmission quality, and is usually limited to short-distance transmission up to about 5 m.
"High-Definition Multimedia Interface" Specification Version 1.3a November 10, 2006, HDMI Licensing, LLC

An object of the present invention is to provide a conventional method for transmitting an HDMI cable collectively signals 19 present HDMI terminals, high-definition transmission, high speed of approximately ^{6.6Gbps (~ 165Mbps x 10bits x (} 3channel + Clock)) Transmission was necessary, and long distance transmission was impossible with metal wiring. When this high-definition transmission is simply transmitted through an optical fiber, there is a problem that an electro-optical conversion device having a band of about 6.6 Gbps is required. Also, HDMI transmission requires communication between the transmission side (source) and the reception side (sink) of the HDMI device, and there is a problem that wiring for that is required separately. In the present invention, by using optical wavelength division multiplex transmission, the price of the apparatus by optical transmission in the band of 2.5 Gbps is reduced, and communication with the receiver of the HDMI standard is performed by communication with the receiving HDMI device on the transmission side. The device cost can be reduced by adopting a device configuration in which wiring between the transmission side (source) and the reception side (sink) can be omitted.

  FIG. 2 shows a first conventional configuration diagram. A transmission function that multiplexes (multiplexes) signals from the HDMI all terminals 1a of the high-definition transmission device 1 such as a video camera and converts the signals into optical signals, and converts the signals converted to light from the HDMI into electricity for demultiplexing. By interposing a transceiver having a receiving function for quessing into an HDMI signal, HDMI transmission over a long distance is enabled. In this case, there has been a problem that optical transmission requires 6.6 Gbps broadband transmission and requires expensive optical components.

FIG. 3 shows a first configuration diagram of the present invention. In the HDMI terminal 3a, four high-speed digital signals of TMDS are transmitted by the broadband optical fiber 7, and other low-speed inter-device recognition and control signal connection are performed by directly connecting the input unit and output unit inside the device. By introducing the wiring method 11 to perform, high-quality long-distance transmission of HDMI is realized. It has been confirmed that HDMI inter-device recognition and control signals can be transmitted if the display 3 connected as a receiving device is a HDMI standardized model similar to the display 2 of the transmission destination. Although it may not be recognized due to differences in device manufacturers, basically, any device to which the HDMI standard of Non-Patent Document 1 is applied can be transmitted. By separately handling broadband signal transmission and other signals, the transmission / reception circuit inside the device can be greatly simplified, enabling high quality, long-distance transmission as well as economy.
In HDMI, content protection by HDCP (High-Bandwidth Digital Content Protection) may be used. When performing encryption transmission by HDCP, first, HDCP license authentication and data encryption key sharing are performed between the source device and the sink device, and then encrypted communication of data is performed. When such mutual authentication between the HDCP source device and the sink device is required, there is a case where the HDTV cannot be transmitted / received by this apparatus. In this case, after the HDMI output of the source device, the HDMI standard reception circuit of the sink device is inserted and the HDMI device is devised to transmit HDMI again.
In FIG. 3 of the present invention, the optical transmission line 7 can be configured with one optical fiber by converting the four optical fiber transmission parts into four waves of light and combining them. On the contrary, if the optical receiving path 8 is similarly transmitted with four waves of light, it can be received by one.
A second block diagram of the present invention is shown in FIG. This is a configuration in which a single fiber 11 transmits the optical transmission path and the optical reception path by using four optical wavelengths different from the four optical wavelengths of the optical transmission path for the optical reception path.
The light received through the optical receiving path is demultiplexed and photoelectrically converted to be converted into an HDMI high-speed signal, and is received by being connected to an HDMI device connected to the HDMI output terminal.

  In the present invention, when a long-distance transmission is performed by converting an electrical signal in the conventional HDMI into an optical signal and transmitting it through an optical fiber, a broadband device of 6 Gbps or more is required as described above. On the other hand, by separately handling TDMS wideband digital signal transmission and other signals such as device recognition, the transmission / reception circuit inside the device can be simplified. Further, by transmitting a high-speed TMDS signal by optical wavelength multiplexing of four wavelengths, each wavelength optical signal can be transmitted in a band of 1.65 to 2.25 Gbps. Since an electro-optical conversion component having a bandwidth of 2.5 Gbps or less can be used, the manufacturing cost of the apparatus can be reduced.

In order to implement the present invention, a method of using two optical fibers (four-wavelength multiplexing) for each of an optical transmission path and an optical reception path and a method of realizing with a single optical fiber using eight-wavelength optical wavelength multiplexing There is.
The former has a characteristic that a configuration in which an output and an input are individually provided can deal with flexibility in terms of optical transmission control when transmitting through a complicated optical fiber network. For example, it is possible to cope with a case where the output destination is different from the input destination.
In the latter, in the transceivers 9 and 10, the HDMI high-speed electrical signal is converted into light of different wavelengths, and the optical transmission path to be transmitted by multiplexing the signals and the optical signal to be received are demultiplexed and photoelectrically converted to HDMI. Since the optical receiving paths for receiving the high-speed electrical signals are light of 8 wavelengths different from each other, the optical transmitting path and the optical receiving path can be configured with one optical fiber, and the optical fiber installation cost can be reduced.

  An embodiment of the cyber hospital of the present invention is shown in FIG. The optical network interface boxes ONIB 15 and 16 are devices corresponding to the transceivers 9 and 10 in the configuration diagram of the present invention shown in FIG. The ONIB has a built-in optical wavelength selection switch. In addition, it is necessary to devise an optical fiber network connection method in a network that enables transmission / reception between multiple points. In this embodiment, an optical hub device OHUB17 that enables multi-input, multi-output optical fiber connection is used. doing. By switching the optical wavelengths of the optical network interfaces ONIB 15 and 16, bidirectional high-definition transmission with a desired partner becomes possible. A specialist at a core hospital can treat patients at remote clinics while observing high-definition video. By using the HDMI optical transmission of the present invention, it is possible to realize advanced medical treatment using high-quality high-definition video without uncompressed delay.

    The present invention has a feature that a transmission distance by a short-distance HDMI cable used for high-definition transmission can be transmitted over a long distance while maintaining a high-quality image, and an uncompressed high-definition signal can be extended to a long-distance transmission. is there. Cyber hospitals such as telemedicine with high-quality images without delay using high-definition bidirectional transmission between remote locations can be realized. In addition, real-time high-definition transmissions such as vehicle driving conditions and horse quality can be transmitted to remote locations for effective car sales and horse racing sales.

It is a figure which shows the high-definition bidirectional transmission by the conventional HDMI. It is a figure which shows the structure of the high-definition transceiver by the conventional optical transmission. It is a figure which shows the structure of the 1st HDTV transceiver of this invention. It is a figure which shows the structure of the 2nd high-vision transceiver of this invention. It is a figure which shows the Example to the cyber hospital of this invention.

Explanation of symbols

1, 4 High-definition transmission equipment (HD video camera, HD player, PC, etc .: source equipment)
2, 3 Hi-Vision receiver (HD display, HD projector, PC, etc .: sink device)
1a, 2a, 3a, 4a HDMI terminal 1b, 2b, 3b, 4b HDMI terminal 5, 6 HDMI cable 7, 8, 13, 14 Optical fiber 9, 10 Transceiver (electro-optical conversion transceiver)
11, 12 Electrical wiring wires 15, 16 Optical network interface box ONIB (transceiver)
17 Multiple Input Multiple Output Optical Hub Device OHUB

Claims (4)

In order to connect between devices having HDMI electrical output or HDMI electrical input, the transmission side converts the HDMI electrical signal to an optical signal and transmits it, and the reception side converts the optical signal to an HDMI electrical signal. In a high-definition optical transceiver that receives signals, the high-speed digital electrical signals TMDS-0, TMDS-1, TMDS-2, and TMDS-3 of HDMI are converted into light of four different wavelengths, and the converted optical signal is converted into one light. The low-speed electrical signals of other CEC, SCL, SDA, and HPD that are transmitted by fiber are directly connected to the input terminals of the respective low-speed electrical signals and the respective low-speed electrical signals HDMI output terminals in the transceiver, so that HDMI high-speed digital electrical A high-definition transceiver characterized by transmitting a signal through an optical fiber. HDMI high-speed digital electrical signals TMDS-0, TMDS-1, TMDS-2, and TMDS-3 are received using optical signals transmitted using four different wavelengths, and converted into electrical signals, The low-speed electric signal of other signals CEC, SCL, SDA and HPD receives an HDMI signal using a signal connected to the HDMI output terminal of claim 1. 3. The transmission and reception of light using one fiber according to claim 1 and claim 2, wherein the four wavelengths of the optical signal transmitted by HDMI and the four wavelengths of the optical signal received by HDMI are different from each other. A high-definition transceiver characterized by In claim 1, claim 2, and claim 3, the device X for transmitting HDMI is connected to the HDMI input of the high-definition transceiver A to convert it to an optical signal, and the optical signal transmitted to a remote place by an optical fiber is received. In a configuration for transmitting HDTV by connecting to a device Y that receives HDMI from the HDTV transceiver B, a device Z receiving HDMI connected to the HDTV transceiver A, and a device Y receiving HDMI connected to the HDTV transceiver B; A high-definition transceiver characterized by connecting devices of the same HDMI standard.

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