JP4940652B2 - Optical transmission system, signal transmission device, optical transmission method, signal transmission device control method, control program - Google Patents

Description

  The present invention relates to an optical transmission system, a signal transmission device, an optical transmission method, an optical transmission control method, and a control program that realize power saving in a startup standby state and perform startup control thereof.

  As a transmission standard for transmitting digital video signals between video signal output devices that output video signals such as TV tuners and hard disk recorders, and video signal input devices that receive and display video signals such as CRT and LCD, There are DVI (Digital Visual Interface) and HDMI (High Definition Multimedia Interface).

  Here, as shown in FIG. 17, the electric signal transmission system 200 includes a source device 201 that outputs a video signal, a monitor device 202 that receives and displays the video signal, and a source device 201 and a monitor device 202. The electric signal cable 203 is connected through the interface. The source device 201 and the monitor device 202 include RGB I / Fs 201a and 202a for inputting and outputting video signals, respectively. Further, the source device 201 and the monitor device 202 include control signals I / F 201b and 202b for inputting and outputting control signals for transmitting and receiving operation commands between the devices. The electric signal cable 203 requires a plurality of electric signal lines in the cable in order to transmit a plurality of signals of the video signal and the control signal. In other words, the electric signal cable 203 is a video signal composed of differential electric signals using two signal lines for one channel called TMDS (Transition Minimized Differential Signaling), and is an RGB signal of three channels of RGB. And four signal lines for transmitting a total of four signals including a synchronization signal for synchronizing the RGB signals.

  In such an electric signal transmission system 200, for example, when transmitting a digital video signal of a standard called Full HD, the pixel rate of the video signal is 148.5 Mbps, and when the digital signal is transmitted according to the TMDS transmission standard, 1 The transmission band per channel is 1.485 Gbps. As described above, when a high bit rate video signal is transmitted according to a transmission standard such as TMDS, when the signal is simply transmitted in an electric signal format via an electric cable, the transmission distance is limited to about several meters. End up.

  Therefore, in order to enable long-distance signal transmission, optical transmission using an optical fiber or the like, in which the transmission attenuation rate of a signal in a high frequency band is much smaller than that of an electrical signal, is used. As a transmission system for optically transmitting a video signal, as shown in Patent Document 1, an RGB signal and a synchronization signal that constitute a video signal are converted into optical signals, respectively, or as disclosed in Patent Document 2. As described above, there is one in which one optical signal line is divided into different wavelength regions, and an RGB signal and a synchronization signal are allocated and transmitted for each divided wavelength region. However, when converting RGB signals and synchronization signals into optical signals as shown in Patent Document 1, an electrical / optical signal conversion unit that converts an electrical signal format into an optical signal format, and an optical signal format, respectively. A plurality of optical / electrical signal converters for converting the signal into the electric signal format are required.

  In the case of so-called WDM (Wavelength Division Multiplexing) transmission in which RGB signals and synchronization signals are each assigned to a wavelength band divided in an optical signal and transmitted as shown in Patent Document 2, a plurality of wavelength regions are used. Accordingly, a conversion unit that multiplexes optical signals and a conversion unit that separates optical signals are required, and a plurality of optical / electrical signal conversion units that convert the separated optical signals into electric signals are required. The circuit scale becomes larger and more complicated, and the power consumption increases accordingly.

  By the way, in the electric signal transmission system in which the video signal output device and the video signal input device are connected via an electric cable, when the standby video signal input device is activated by an activation command from the video signal output device. A predetermined activation control signal is transmitted from the video signal output device to the video signal input device via an electric cable.

  In contrast, in an optical transmission system that transmits a video signal using an optical signal, when the video signal output device activates a standby video signal input device, the video signal output device converts the electrical signal into an optical signal. / Because it is necessary to always supply power to the optical signal conversion unit and its peripheral circuits, the power consumption of such a conversion unit is large even in a standby state, and power saving cannot be realized. On the other hand, the video signal input device is an optical signal format transmitted from the video signal output device when power is not supplied to the optical / electrical signal conversion unit that converts an optical signal into an electrical signal for power saving. The activation control signal could not be received and could not be activated.

  Therefore, in order to shift the optical transmission system from the power-saving standby state to the normal operation state, the video signal output device converts the activation control signal in the electrical signal format into the optical signal format with the power consumption reduced. In addition, the video signal input device needs to convert the start control signal in the optical signal format into the electrical signal format and receive it with the power consumption reduced. Here, by using an activation control signal having a frequency component as low as possible, it is possible to reduce power consumption in these signal conversion units. However, when a user inputs an activation command to a standby apparatus using an infrared remote controller that is generally used as a user interface, the apparatus side receives the signal because the frequency band of the infrared remote control signal is high. If the transmitted signal is optically transmitted through the electrical / optical signal conversion unit as it is, the power consumption of the electrical / optical signal conversion unit of the video signal output device and the optical / electrical signal conversion unit of the video signal input device can be suppressed. The power saving state could not be realized.

JP 2002-366340 A JP 2003-273434 A

  The present invention has been proposed in view of such a conventional situation, and is an optical transmission system that converts an electrical signal into an optical signal and transmits the optical signal. To provide an optical transmission system, a signal transmission device, an optical transmission method, a control method for a signal transmission device, and a control program for performing activation control in a signal transmission device in a standby state even when using a startup control signal transmitted by a remote controller With the goal.

In order to achieve the above-described object, an optical transmission system according to the present invention includes a first signal transmission device and a second signal transmission device connected via an optical transmission cable for transmitting a predetermined transmission signal. In the optical transmission system, the first signal transmission device includes a first electrical / optical signal conversion unit that converts a transmission signal in an electrical signal format into an optical signal format, and an optical transmission cable from the second signal transmission device. A first optical / electrical signal conversion unit that converts a transmission signal in an optical signal format transmitted via a signal into an electrical signal format, and a first activation control unit that performs control to shift from a standby state to a normal operation state A second signal transmission device comprising: a second electrical / optical signal converter for converting a transmission signal in electrical signal format into an optical signal format; and a transmission signal in optical signal format transmitted from the first signal transmission device. second optical / electrical signal for converting the electric signal form A conversion unit, a second start control section for controlling the transition from the standby state to the normal operation state, an infrared light receiving section for converting into an electrical signal format by receiving the oscillation signal from the infrared remote controller that transmits an infrared signal the provided, the second signal transmission device, into an electrical signal format with the infrared light receiving section for receiving the activation control signal of an infrared signal standard for controlling the transition from the wait state that will be transmitted from the infrared remote controller to the normal operation state and converting transmitted to the second activation control unit activates the second electrical / optical signal conversion unit in response to the activation control signal of an infrared signal standard to be transmitted second activation control unit from the infrared light receiving unit, start control signal was transmitted to a second electrical / optical signal conversion unit converts the transmission frequency band from the infrared signal standard low transmission signal standard, a second electrical / optical signal conversion unit of the electrical signal format Converts the activation control signal of transmission signal standard to the optical signal format and transmitted via the optical cable to the first signal transmission device in the standby state, the first signal transmission device, the light from the second signal transmission device The first optical / electrical signal conversion unit converts the optical signal format activation control signal transmitted via the transmission cable into the electric signal format and transmits the electric signal format to the first activation control unit, and the first activation control unit The start control signal is converted from the transmission signal standard to the infrared signal standard, the start control information is read, the standby state is changed to the normal operation state according to the start control information , and the second signal transmission device and the first signal transmission device The transmission signal is transmitted through the optical transmission cable.

The signal transmission device according to the present invention is a signal transmission device connected to another signal transmission device via an optical transmission cable in an optical transmission system for transmitting a predetermined transmission signal, and the transmission in the form of an electric signal. Light for converting the transmission signal in the optical signal format transmitted from the other signal transmission apparatus connected via the optical transmission cable to the electrical signal format and the electrical / optical signal conversion unit for converting the signal into the optical signal format / Electric signal conversion unit, an activation control unit that performs control to shift from the standby state to the normal operation state, and an infrared signal that receives an infrared signal transmitted from an infrared remote controller that transmits an infrared signal standard infrared signal and converts it into an electrical signal format e Bei a light receiving portion, infrared receiver is, that are sent from an infrared remote controller, activation system of the infrared signal standard for controlling the transition from the standby state to the normal operation state The signal is received and converted into an electric signal format and transmitted to the activation control unit. The activation control unit activates the electric / optical signal conversion unit in response to the activation control signal of the infrared signal standard transmitted from the infrared light receiving unit. , transmitted to the electrical / optical signal conversion unit converts the start control signal to the transmission frequency band from the infrared signal standard low transmission signal standards, electrical / optical signal conversion unit, the transmission signal standard of the start control signal of the electrical signal format Is converted to an optical signal format and transmitted to the other signal transmission device in the standby state via the optical transmission cable, and the other signal transmission device is shifted from the standby state to the normal operation state by the start control signal, and other signals are transmitted. Transmission signals are transmitted to and from the transmission device via an optical transmission cable.

The signal transmission device according to the present invention is a signal transmission device connected to another signal transmission device via an optical transmission cable in an optical transmission system for transmitting a predetermined transmission signal, and is a transmission signal in the form of an electric signal. An optical / electrical signal for converting an optical signal format transmission signal transmitted from another signal transmission device connected via an optical transmission cable to an electrical signal format. A signal having a lower transmission frequency band than an infrared signal standard received by an infrared light receiving unit included in another signal transmission device, including a conversion unit and an activation control unit that performs control to shift from a standby state to a normal operation state. is transmitted through an optical transmission cable from another signal transmission device, a start control signal of the optical signal format for performing control to shift from the standby state to the normal operation state, the optical / electrical signal converter electric signal Send to the start control unit converts the format, the start control unit reads the startup control information by converting the activation control signal of the transmission signal standard to the infrared signal standard, the standby state activation control unit in response to the activation control information Then, the normal operation state is entered, and transmission signals are transmitted to and from other signal transmission apparatuses via optical transmission cables.

The optical transmission method according to the present invention also provides optical transmission in an optical transmission system that transmits a predetermined transmission signal and includes a first signal transmission device and a second signal transmission device connected via an optical transmission cable. a method, a second signal transmission device, into an electric signal format by receiving the activation control signal of an infrared signal standard for controlling the transition from the wait state that will be transmitted from the infrared remote controller to the normal operation state In response to the activation control signal of the infrared signal standard, the standby state is shifted to the normal operation state, the activation control signal is converted into a transmission signal standard whose transmission frequency band is lower than that of the infrared signal standard , and the activation control signal in the electrical signal format is optical It is converted to a signal format and transmitted via the optical cable to the first signal transmission device in the standby state, the first signal transmission device via the optical transmission cable from the second signal transmission device Den Converting a start control signal of the optical signal format that is in electrical signal form, reads the startup control information is converted into an infrared signal standard to the activation control signal of the electric signal form the transmission signal standards, a standby state in response to the activation control information From the first signal transmission device to the normal operation state, and transmission signals are transmitted between the second signal transmission device and the first signal transmission device via the optical transmission cable.

The signal transmission device control method according to the present invention is a method for controlling a signal transmission device connected to another signal transmission device via an optical transmission cable in an optical transmission system for transmitting a predetermined transmission signal, infrared that are sent from the remote controller, and converted into an electrical signal format by receiving the activation control signal of an infrared signal standard for controlling the transition from the standby state to the normal operating state, a standby state in response to the activation control signal of an infrared signal standards To the normal operating state, convert the infrared signal standard activation control signal to a transmission signal standard whose transmission frequency band is lower than the infrared signal standard , convert the electrical signal format activation control signal to the optical signal format, and transmit the optical transmission cable The other signal transmission device is transferred from the standby state to the normal operation state by the start control signal, and the normal operation is performed. Among other signal transmission device shifts to state, through the optical cable, to transmit the transmission signal.

The signal transmission device control method according to the present invention is a method for controlling a signal transmission device connected to another signal transmission device via an optical transmission cable in an optical transmission system for transmitting a predetermined transmission signal, It is a transmission signal standard whose transmission frequency band is lower than the infrared signal standard received by the infrared light receiving unit of another signal transmission device, and is transmitted from the other signal transmission device via an optical transmission cable. converting a start control signal of the optical signal format for performing control to shift to the operating state into an electrical signal format, it reads the startup control information is converted into an infrared signal standard to the activation control signal of the electric signal form the transmission signal standards, startup control The unit shifts from the standby state to the normal operation state according to the activation control information, and transmits signals to and from other signal transmission devices that have shifted to the normal operation state via the optical transmission cable. Carry out the transmission.

The control program according to the present invention is a control program executed by a computer installed in a signal transmission apparatus connected to another signal transmission apparatus via an optical transmission cable in an optical transmission system that transmits a predetermined transmission signal. An infrared signal standard transmitted from an infrared remote controller, which receives a start control signal for performing control to shift from a standby state to a normal operation state, converts it into an electrical signal format, and starts control of the infrared signal standard Transition from standby state to normal operation state according to the signal , convert the infrared signal standard activation control signal to the transmission signal standard whose transmission frequency band is lower than the infrared signal standard, and convert the activation control signal of the electrical signal format transmission signal standard Convert to optical signal format and transmit to the other signal transmission device in the standby state via the optical transmission cable. No. transmission device shifts from the standby state to the normal operation state, among other signal transmission device shifts to the normal operation state, through the optical cable, performs control to transmit a transmission signal.

The control program according to the present invention is a control method of a signal transmission apparatus connected to another signal transmission apparatus through the optical cable in an optical transmission system for transmitting a predetermined transmission signal, another signal transmission A transmission signal standard whose transmission frequency band is lower than that of the infrared signal standard received by the infrared light receiving unit of the device, which is transmitted from another signal transmission device via an optical transmission cable, and shifts from a standby state to a normal operation state. a start control signal of the optical signal format that performs control to convert into an electrical signal format, converts the start control signal of the electric signal form the transmission signal standard to infrared signal standard read activation control information, activation control unit startup control Depending on the information, the standby state is changed to the normal operation state, and the transmission signal is transmitted via the optical transmission cable to other signal transmission devices that have changed to the normal operation state. It performs control.

In the present invention, one signal transmission device receives an infrared signal standard activation control signal in the form of an infrared signal transmitted from an infrared remote controller, and converts the activation control signal to a transmission signal standard whose transmission frequency band is lower than the infrared signal standard. The signal is converted and transmitted to the other signal transmission device in the standby state via the optical transmission cable, and the other signal transmission device converts the activation control signal from the transmission signal standard to the infrared signal standard and reads the activation control information. Then, control for shifting from the standby state to the normal operation state is performed according to the activation control information.

  As a result, the present invention reduces the power consumed by the electrical / optical signal processing for converting an electrical signal into an optical signal and the optical / electrical signal processing for converting an optical signal into an electrical signal in the standby state. Thus, it is possible to realize power saving at the time of standby for startup and to perform startup control of the optical transmission system according to a startup control signal transmitted by the infrared remote controller at the time of startup standby.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. The present embodiment is applied to an optical transmission system 1 that transmits a video signal.

  As shown in FIG. 1, the optical transmission system 1 connects a source device 10 that outputs a video signal, a monitor device 20 that displays a video signal output from the source device 10, and the source device 10 and the monitor device 20. The optical signal cable 30 transmits a transmission signal such as a video signal in the optical signal format, and the infrared remote controller 40 transmits a remote control command to the monitor device 20 using the infrared signal.

  As shown in FIG. 1, the source device 10 includes a source main body 11 that reads video data from a video recording medium, and a video signal I / F unit that outputs a video signal generated by the source main body 11 to the outside. 12 and the control signal I / F unit 13 that outputs a control signal for communication between the monitor device 20 connected via the optical signal cable 30 and the video signal and the control signal are the same optical signal. And a source transmission processing unit 14 for performing signal processing for transmission.

  The source main body 11 generates video signals by reading video data from a video recording medium or receiving broadcast video signals. Here, the video signal is specifically composed of an RGB signal composed of three primary color signals and a clock signal for synchronizing the RGB signal, and is output from the video signal I / F unit 12 to the outside. Further, as shown in FIG. 1, the source main body 11 further includes an infrared signal decoder 11 a that converts a SIRCS signal that is a transmission signal standard of the infrared remote controller 40 and reads control information. The infrared signal decoder 11 a reads control data from a control signal of the SIRCS signal standard transmitted from the monitor device 20 via the control signal I / F unit 13.

  The control signal I / F unit 13 converts a control signal for communication with the monitor device 20 connected via the optical signal cable 30 into a predetermined transmission standard. Here, the control signal is a command signal transmitted / received to / from the connected monitor device 20.

  As shown in FIG. 1, the monitor device 20 includes a monitor main unit 21 that displays a video signal transmitted from the source device 10, a video signal I / F unit 22 that inputs the video signal to the monitor main unit 21, A control signal I / F unit 23 that outputs a control signal for communication with the source device 10 connected via the signal cable 30 and a signal for transmitting the video signal and the control signal as the same optical signal And a monitor transmission processing unit 24 that performs processing.

  The monitor main body 21 displays a video signal transmitted from the source device 10. Here, the video signal is specifically composed of an RGB signal composed of three primary color signals and a clock signal for synchronizing the RGB signal, and is input from the video signal I / F unit 22. As shown in FIG. 1, the monitor main body 21 includes a light receiving module 21 a that receives an infrared signal transmitted from the infrared remote controller 40 and converts it into an electric signal format.

  The control signal I / F unit 23 converts a control signal for communication with the source device 10 connected via the optical signal cable 30 into a predetermined transmission standard. Here, the control signal is a command signal transmitted / received to / from the connected source device 10.

  The optical signal cable 30 is composed of a total of two optical fibers, a signal line for transmitting a video signal and a control signal from the source device 10 to the monitor device 20, and a signal line for transmitting a control signal from the monitor device 20 to the source device 10. Has been. Here, each signal line transmits a serial signal.

  Infrared remote controller 40, as shown in FIG. 2, in response to a predetermined control command, SIRCS (Serial Infrared Remote System) signal standard that expresses a signal of 0 and 1 by the difference in time interval of Low / High signal. Send a control signal.

  Next, the configuration of the source transmission processing unit 14 of the source device 10 will be described in detail with reference to FIG. As shown in FIG. 3, the source transmission processing unit 14 multiplexes or separates the video signal and the control signal, respectively, to convert the signal into an electrical signal suitable for optical transmission, and an electrical signal processing unit. 141, an E / O converter 142 that converts the electrical signal converted by the optical signal 141 into an optical signal, an O / E converter 143 that converts an optical signal transmitted from the monitor device 20 through the optical signal cable 30 into an electrical signal, It is comprised from the starting control part 144 which performs control which transfers to the normal operation state from the standby state between monitor devices 20.

  The electrical signal processing unit 141 multiplexes or separates the video signal and the control signal, respectively. As shown in FIG. 3, the RGB I / F device unit 141a, the logic unit 141b, and the SERDES conversion unit 141c It is configured.

  The RGB I / F device unit 141a extracts a video signal and a clock for transmission to another device from the video signal based on a predetermined digital video signal transmission standard output from the video signal I / F unit 12. Specific digital video signal transmission standards include DVI (Digital Visual Interface) and HDMI (High Definition Multimedia Interface).

  The logic unit 141b time-divisions the video signal and clock extracted by the RGB I / F device unit 141a and the control signal output from the control signal I / F unit 13, and multiplexes them into one signal. In addition, a control signal that is an optical signal sent from the monitor device 20 via the optical signal cable 30 and converted into an electrical signal by the O / E conversion unit 143 is provided to the logic unit 141b. Here, since the control signal input to the logic unit 141b is multiplexed into one signal, the logic unit 141b performs separation processing and converts it into a predetermined digital signal transmission standard.

  The SERDES conversion unit 141c converts the signal multiplexed by the logic unit 141b into a serial signal by performing code conversion suitable for optical transmission. Here, the optical signal cable 30 includes two optical signal lines for transmission and reception. The transmission format of each optical signal line is a serial transmission format. Therefore, the SERDES conversion unit 141c converts the signal multiplexed by the logic unit 141b into an electric signal in a serial signal format suitable for an optical signal transmitted in the serial transmission format.

  The E / O conversion unit 142 converts the electrical signal multiplexed and serialized by the electrical signal processing unit 141 into an optical signal. Further, the E / O conversion unit 142 changes the transmission frequency band of the optical signal according to the amount of information to be transmitted. Here, the E / O conversion unit 142 can reduce power consumption by transmitting in the low frequency band. Specifically, the E / O conversion unit 142 includes a normal conversion mode for transmitting a signal having a large amount of information such as a video signal and a power saving conversion mode for transmitting a signal corresponding to a small amount of information compared to the video signal. It has at least two modes, and switches between these two modes in accordance with a control command from the activation control unit 144 to convert an electrical signal into an optical signal.

  The O / E converter 143 detects an optical signal transmitted from the monitor device 20 via the optical cable 30 and converts it into an electrical signal. Further, the O / E converter 143 changes the frequency band for detecting the optical signal according to the amount of information transmitted from the optical signal cable 30. Here, the O / E conversion unit 143 can reduce power consumption by lowering the detection frequency band. Specifically, the O / E conversion unit 143 includes at least two of a normal conversion mode for detecting a signal with a large amount of information such as a video signal and a power saving conversion mode for detecting a signal with a small amount of information compared to the video signal. There are two modes, and conversion is performed by switching between these two modes in accordance with a control command from the activation control unit 144.

  The activation control unit 144 performs communication of an activation control signal for shifting from the standby state to the normal operation state. The activation control unit 144 uses an arithmetic processing device that can operate with low power consumption. Specifically, the arithmetic processing apparatus incorporates a start control program for receiving a start control signal from the monitor device 20 and controlling the source device 10 to shift from the standby state to the normal operation state. Therefore, the activation control unit 144 controls the power supplied to the E / O conversion unit 142 and the O / E conversion unit 143 according to the activation control program.

  The activation control unit 144 receives the activation control signal in the serial signal format and reads the activation control data based on the UART signal standard described later, and the activation control data read by the UART reception unit 144a by infrared remote control The SIRCS transmission unit 144b converts the SIRCS signal, which is a signal transmission standard of the controller 40, into a SIRCS signal.

  The UART reception unit 144a receives an activation control signal in the form of a serial signal, which is an electrical signal, from the O / E conversion unit 143, and changes the signal to Low / High at regular time intervals as shown in FIG. The activation control data is read based on the UART (Universal Asynchronous Receiver Transmitter) signal standard that expresses the signals 0 and 1 according to the change, and the activation control data is output to the SIRCS transmission unit 144b.

  The SIRCS transmission unit 144 b generates an activation control signal of the SIRCS signal standard corresponding to the activation control data output from the UART reception unit 144 a and outputs the activation control signal to the control signal I / F unit 13.

  Next, the configuration of the monitor transmission processing unit 24 of the monitor device 20 will be described in detail with reference to FIG. As shown in FIG. 5, the monitor transmission processing unit 24 includes an electric signal processing unit 241 that performs signal processing of an optical signal of the optical signal cable 30 to a predetermined digital video signal transmission standard I / F of the monitor device 20. An E / O converter 242 that converts the electrical signal processed in the electrical signal processor 241 into an optical signal, and an O that converts an optical signal transmitted from the source device 10 through the optical signal cable 30 into an electrical signal. It is comprised from the starting control part 244 which performs control which transfers to / normal operation | movement state between the / E conversion part 243 and the source device 10. FIG.

  As shown in FIG. 5, the electric signal processing unit 241 includes a SERDES conversion unit 241a, a logic unit 241b, and an RGB I / F device unit 241c.

  The SERDES conversion unit 241a converts an optical signal that is transmitted from the source device 10 via the optical signal cable 30 and converted by the O / E conversion unit 243 into a parallel signal. Here, since the optical signal transmitted via the optical signal cable 30 is in the serial signal format, an electrical signal in the serial signal format is output from the O / E converter 243.

  Since the signal converted into the parallel signal format by the SERDES conversion unit 241a is multiplexed in a time division manner, the logic unit 241b separates the multiplexed signal into a video signal and a control signal.

  The RGB I / F device unit 241c converts the video signal subjected to the separation processing by the logic unit 241b into a video signal format based on a predetermined digital video signal transmission standard, and outputs the video signal to the video signal I / F unit 22. .

  The E / O conversion unit 242 converts the electrical signal multiplexed in the electrical signal processing unit 241 into an optical signal. Here, like the E / O conversion unit 142 of the source device 10, the E / O conversion unit 242 has two modes of a normal conversion mode and a power saving conversion mode. In response to a control command, these two modes are switched to convert an electrical signal into an optical signal.

  The O / E conversion unit 243 converts an optical signal transmitted from the source device 10 via the optical cable 30 into an electrical signal. Here, like the O / E conversion unit 143 of the source device 10, the O / E conversion unit 243 has at least two modes of a normal conversion mode and a power saving conversion mode. In response to the control command, the optical signal is converted into an electrical signal by switching between these two modes.

  The activation control unit 244 communicates an activation control signal for shifting from the standby state to the normal operation state. The activation control unit 244 uses an arithmetic processing unit that can operate with low power consumption. Specifically, the arithmetic processing device incorporates a start control program for transmitting a start control signal for shifting the source device 10 from the standby state to the normal operation state. The activation control unit 244 controls the power supplied to the E / O conversion unit 242 and the O / E conversion unit 243 according to the activation control program.

  In addition, the activation control unit 244 reads the activation control signal output from the control signal I / F unit 23 based on the SIRCS signal standard, the SIRCS reception unit 244a, and the activation read by the SIRCS reception unit 244a. The UART transmission unit 244b converts the control data into a serial signal of the UART signal standard.

  The SIRCS receiving unit 244a reads activation control data from the control signal transmitted from the control signal I / F unit 23 based on the SIRCS signal standard. Further, the SIRCS receiver 244a outputs the read activation control data to the UART transmitter 244b.

  The UART transmission unit 244b generates an activation control signal of the UART signal standard corresponding to the activation control data output from the SIRCS reception unit 244a and transmits it to the E / O conversion unit 242.

  Next, an activation control process for shifting from the standby state to the normal operation state using the activation control units 144 and 244 provided in the source device 10 and the monitor device 20 will be described with reference to FIG.

  In the present embodiment, the source device 10 and the monitor device 20 that are in the standby state are treated with attention to the activation control process for shifting to the normal operation state. Therefore, in the present embodiment, the description regarding the transmission of the video signal performed by the optical transmission system 1 after shifting to the normal operation state is omitted. In addition, this activation control process is executed according to activation control programs written in the activation control units 144 and 244, respectively.

  First, the processing steps of the activation control unit 244 in the monitor device 20 from the power supply shown in steps S1 to S5 in FIG. 6 until the standby state is set will be described.

  In step S <b> 1, the activation control unit 244 is supplied with power from the monitor main body unit 21. Here, the monitor main unit 21 is in a standby state, and when a start command is input from a predetermined user interface such as the infrared remote controller 40, the monitor main unit 21 shifts to a normal operation state, and via the control signal I / F unit 23. Then, power is supplied to the activation control unit 244.

  In step S2, when power is supplied to the activation control unit 244, the activation control unit 244 performs predetermined initial settings according to the activation control program.

  In step S3, when the initial setting is completed, the activation control unit 244 performs activation I / O interrupt setting according to the activation control program. Here, the activation I / O interrupt setting is a control signal I connected to the activation control unit 244 by limiting the power supplied to each block of the monitor transmission processing unit 24 to enter a power-saving standby state. In accordance with detection of a change in the control signal input from the / F unit 23, the setting shifts from the standby state to the normal activation state to release the restricted operation.

  In step S4, when the start I / O interrupt setting is completed, the start control unit 244 shifts the monitor transmission processing unit 24 to the standby state according to the start control program. Specifically, the monitor transmission processing unit 24 shifts to a standby state in which power is supplied only to the activation control unit 244. Here, the activation control unit 244 performs an interrupt process according to a simple High / Low voltage level output from the O / E conversion unit 243 via the control signal I / F unit 23 and the optical signal cable 30. Set to standby state with limited processing capacity.

  In step S5, when the monitor transmission processing unit 24 shifts to the standby state, the activation control unit 244 responds to the High / Low voltage level from the control signal I / F unit 23 or the O / E conversion unit 243 according to the activation control program. It is determined whether there is an interrupt activation instruction. Here, if there is an interrupt activation instruction, the activation control program proceeds to step S6, and if there is no interrupt activation instruction, this process is repeatedly executed.

  On the other hand, the activation control unit 144 in the source device 10 is also supplied with power in the same manner as the activation control unit 244 in the monitor device 20 and is set in a standby state in steps S21 to S25. Here, in step S4 of the activation control process of the monitor device 20, the activation control unit 244 performs interrupt processing for the High / Low voltage level from the control signal I / F unit 23, whereas the source device 10 In step S <b> 24, the activation control unit 144 is in a state of waiting for an interrupt process according to the High / Low voltage level output from the O / E conversion unit 243 via the optical signal cable 30.

  Next, a description will be given of an activation process in which an interrupt process for canceling the standby state is performed on the source device 10 and the monitor device 20 in the standby state, and the two devices shift to the normal operation state in which the video signal is optically transmitted. .

  In step S6, the activation control unit 244 in the monitor main body unit 21 receives an interrupt activation command corresponding to the High / Low signal from the control signal I / F unit 23, and shifts from the standby state to the normal operation state according to the activation control program. To do. Here, the monitor body 21 receives the activation control signal of the SIRCS signal standard transmitted from the infrared remote controller 40 by the light receiving module 21a, shifts from the standby state to the normal operation state, and controls the received SIRCS signal standard. The signal is transmitted to the activation control unit 244 via the control signal I / F unit 23. In addition, the activation control unit 244 recognizes the control signal transmitted from the control signal I / E unit 23 as an interrupt activation command corresponding to the High / Low signal, and performs activation control.

  In step S7, the activation control unit 244 reads activation control data from the activation control signal output from the control signal I / F unit 23 according to the activation control program. Specifically, the activation control unit 244 causes the SIRCS reception unit 244a to read activation control data from the activation control signal of the SIRCS signal standard transmitted from the control signal I / F unit 23 according to the activation control program. . The SIRCS receiver 244a outputs the read activation control data to the UART transmitter 244b. Here, the activation control data is data read based on a predetermined signal transmission standard in the activation control signal, and is not an interrupt activation command corresponding to a simple High / Low signal, but specific to the source device 10. It is treated as a control command.

  In step S8, the activation control unit 244 causes the E / O conversion unit 242 to supply power according to the activation control program and activate the power saving mode.

  In step S9, the activation control unit 244 confirms that the E / O conversion unit 242 has been activated in the power saving mode according to the activation control program, and receives the activation control signal output from the control signal I / F unit 23. The data is output to the E / O conversion unit 242. Specifically, the activation control unit 244 generates an activation control signal of the UART signal standard in accordance with the activation control data read by the SIRCS reception unit 244a with respect to the UART transmission unit 244b according to the activation control program. The data is transmitted to the O conversion unit 242. Here, since the activation control signal is a UART signal standard, it can be transmitted to the E / O converter 242 at a low transmission rate, and the operation of the E / O converter 242 can be saved. Specifically, the video signal is transmitted at a speed of Gbps or Mbps, whereas the activation control signal is transmitted at a low speed of Kbps. Further, the activation control unit 244 causes the E / O conversion unit 242 to convert the activation control signal into an optical signal and transmit it to the optical signal cable 30 according to the activation control program.

  In step S10, when the E / O conversion unit 242 transmits a start control signal to the source device 10 via the optical signal cable 30, the start control unit 244 performs each processing unit of the electrical signal processing unit 241 according to the start control program. To prepare for a video signal transmitted from the source device 10 via the optical signal cable 30.

  In step S11, the activation control unit 244 determines whether or not to shift to a standby state according to the activation control program. If it is determined that the activation control unit 244 does not shift to the standby state, the operation of step S11 is repeated. If it is determined that the activation control unit 244 shifts to the standby state, the activation control process is returned to step S4.

  Next, after the activation control signal transmitted from the monitor device 20 to the optical signal cable 30 reaches the source transmission processing unit 14, the activation control unit 144 performs source processing according to the activation control program according to the processing steps of steps S 25 to 29. The transmission processing unit 14 is shifted from the standby state to the normal operation state.

  First, the activation control signal is input to the O / E conversion unit 143 via the optical signal cable 30. Subsequently, the O / E conversion unit 143 converts the activation control signal in the optical signal format into an electrical signal format, and outputs it to the activation control unit 144.

  In step S26, when the activation control signal is input from the O / E conversion unit 143 to the activation control unit 144, the activation control unit 144 interrupts according to the voltage change caused by the input of the activation control signal according to the activation control program. Processing is performed, and a transition is made from the standby state to the operating state.

  In step S27, when the activation control unit 144 shifts to the operation state, the activation control unit 144 reads the activation control data from the activation control signal optically transmitted from the monitor device 20 according to the activation control program. Specifically, the activation control unit 144 causes the UART reception unit 144a to read the activation control data based on the UART signal format from the O / E conversion unit 143 according to the activation control program. The UART receiver 144a outputs the read activation control data to the SIRCS transmitter 144b.

  In step S28, the activation control unit 144 outputs the activation control data read from the activation control signal to the control signal I / F unit 13 according to the activation control program. Specifically, the activation control unit 144 converts the SIRCS transmission unit 144b into an activation control signal of the SIRCS signal standard corresponding to the activation control data transmitted from the UART reception unit 144a according to the activation control program. Further, the SIRCS transmission unit 144 b transmits the activation control signal of the SIRCS signal standard to the SIRCS decoder unit 11 a provided in the source main body unit 11 via the control signal I / F unit 13.

  Thereafter, the source body unit 11 receives the activation control signal of the SIRCS signal standard via the control signal I / F unit 13 and inputs the activation control signal to the SIRCS decoder unit 11a, and the activation control data is read by the SIRCS decoder unit 11a. By the I / O interrupt processing corresponding to the data, the standby state is shifted to the normal operation state. Specifically, the source main body 11 performs operations such as outputting a video signal in accordance with the input activation control data.

  In step S29, when the activation control signal is output to the control signal I / F unit 13, the activation control unit 144 supplies power to each block of the source transmission processing unit 14 according to the activation control program, and the source body unit. 11 is prepared for the signal processing for the video signal output from 11.

  In step S30, the activation control unit 144 determines whether or not to shift to a standby state according to the activation control program. If it is determined that the activation control unit 144 does not shift to the standby state, the operation of step S30 is repeated. If it is determined that the activation control unit 144 shifts to the standby state, the activation control process returns to step S24.

  Through the above processing steps, the source device 10 and the monitor device 20 shift from a standby state to an operation state in which a video signal is optically transmitted.

  As described above, the activation control units 144 and 244 execute the activation control process in accordance with the activation control program incorporated in these arithmetic processing devices. Therefore, the activation control units 144 and 244 perform complicated activation control that turns off the power of the portions that do not require operation in the power saving state and supplies only the necessary power to the portions that require operation in the standby state. be able to. Furthermore, since such complicated start-up control is executed by software, it is not necessary to design complex hardware, and design specifications can be easily rewritten according to the purpose.

  In addition, the activation control units 144 and 244 realize power saving in a standby state by using an arithmetic processing device with low power consumption. In addition to the normal operation state, such an arithmetic processing unit with low power consumption can perform a standby state or an interrupt activation process that can be shifted from the standby state to the normal operation state by an external input. The power consumption in can be reduced.

  Further, in the optical transmission system 1, the monitor device 20 is activated according to the activation control signal of the SIRCS signal standard transmitted from the infrared remote controller 40, and the SIRCS signal standard is converted into the activation control signal of the UART signal standard to generate an optical signal. Transmission of the source device 10 is also performed via the transmission cable 30.

  Further, when transmitting equivalent information per unit time, the transmission signal frequency of the UART signal standard can be reduced to about ½ to ３ compared to the SIRCS signal standard. In the activation control process, the E / O conversion unit 242 of the monitor device 20 converts the control signal in the electrical signal format into the optical signal format according to the UART signal standard and transmits the converted signal, and the O / E conversion unit 143 of the source device 10. Similarly, the control signal in the optical signal format is converted into the electrical signal format and transmitted in accordance with the UART signal standard. Accordingly, the O / E conversion unit 143 of the source device 10 and the E / O conversion unit 242 of the monitor device 20 perform signal conversion of the UART signal standard having a lower frequency component than the SIRCS signal standard. Power consumption can be reduced, and power saving can be achieved.

  Here, in order for the signal of the UART signal standard to make the frequency band of the signal slower than the signal of the SIRCS signal standard, the activation control data read by the SIRCS reception unit 244a is temporarily stored and transmitted from the UART transmission unit. The transmission time of the UART signal standard signal to be adjusted must be adjusted. Therefore, in order to convert the SIRCS signal standard activation control signal from the infrared remote controller 40 to a UART signal standard signal and perform optical transmission via the optical transmission cable 30, the signal standard is converted. The activation control units 144 and 244 need a buffer unit for temporarily storing control data. Therefore, processing steps of the activation control units 144 and 244 provided with a buffer unit for temporarily storing activation control data will be described.

  As shown in FIG. 7, the activation control unit 244 of the monitor device 20 includes a buffer unit 244c for temporarily storing activation control data read by the SIRCS reception unit 244a in addition to the SIRCS reception unit 244a and the UART transmission unit 244b. Prepare.

  The SIRCS receiver 244a includes a SIRCS decoder 244a-1 and a data register 244a-2. The SIRCS decoder unit 244a-1 reads out the activation control data based on the SIRCS signal standard from the output signal from the control signal I / F unit 23 and outputs it to the data register 244a-2 and is stored in the data register 244a-2. An input request command for inputting the startup control data to the buffer unit 244c is output to the buffer unit 244c. The data register 244a-2 stores the activation control data output from the SIRCS decoder unit 244a-1, and also stores the activation control data in response to an input request command from the SIRCS decoder unit 244a-1 to the buffer unit 244c. To 244c.

  The UART transmission unit 244b includes a UART encoder unit 244b-1 and a data register 244b-2. The UART encoder unit 244b-1 outputs, to the buffer unit 244c, an output request command for outputting the activation control data stored in the buffer unit 244c to the data register 244b-2. The UART encoder unit 244b-1 reads the activation control data stored in the data register 244b-2 and transmits an activation control signal based on the UART signal standard corresponding to the activation control data to the E / O conversion unit 242. . The data register 244b-2 stores activation control data output from the buffer unit 244c.

  The buffer unit 244c stores activation control data according to the input request command from the SIRCS reception unit 244a, and outputs the activation control data according to the output request command from the UART transmission unit 244b.

  As shown in FIG. 8, the activation control unit 144 of the source device 10 includes a buffer unit 144c that temporarily stores the activation control data read by the UART reception unit 144a in addition to the UART reception unit 144a and the SIRCS transmission unit 144b. Prepare.

  The UART receiving unit 144a includes a UART decoder unit 144a-1 and a data register 144a-2. The UART decoder unit 144a-1 reads activation control data based on the UART signal standard from the activation control signal in the electrical signal format output from the O / E conversion unit 143, and outputs the activation control data to the data register 144a-2. Further, the UART decoder unit 144a-1 outputs an input request command for inputting the activation control data temporarily stored in the data register 144a-2 to the buffer unit 144c, to the buffer unit 144c. The data register 144a-2 stores the activation control data output from the UART decoder unit 144a-1, and also stores the activation control data in response to an input request command from the UART decoder unit 144a-1 to the buffer unit 144c. To 144c.

  The SIRCS transmission unit 144b includes a SIRCS encoder unit 144b-1 and a data register 144b-2. The SIRCS encoder unit 144b-1 outputs an output request command for outputting the activation control data stored in the buffer unit 144c to the data register 144b-2, to the buffer unit 144c. The SIRCS encoder unit 144b-1 receives the activation control data stored in the data register 144b-2, generates an activation control signal based on the SIRCS signal standard according to the activation control data, and generates the control signal I / The data is transmitted to the SIRCS decoder unit 11 a of the source body unit 11 via the F unit 23. The data register 144b-2 stores activation control data output from the buffer unit 144c.

  The buffer unit 144c stores activation control data in response to an input request command from the UART reception unit 144a, and outputs activation control data in response to an output request command from the SIRCS transmission unit 144b.

  Here, the buffer units 144c and 244c similarly input / output activation control data in accordance with the activation control programs incorporated in the arithmetic processing units of the activation control units 144 and 244, respectively. In the buffer units 144c and 244c, the activation control data is realized by storing the activation control data in a memory provided in a microcomputer constituting the activation control units 144 and 244, respectively. Therefore, it is not necessary to provide a dedicated memory for realizing the functions of the buffer units 144c and 244c, and the cost is excellent.

  Next, the input / output processing process of the activation control data performed by the buffer units 144c and 244c will be described. Here, since the buffer units 144c and 244c perform the same input / output processing of activation control data between predetermined data registers, the processing of the buffer unit 244c of the monitor device 20 will be described below with reference to FIG. This will be described in detail with reference to FIG.

  First, the activation control data input / output process in the activation control program executed in the buffer unit 244c on the monitor device 20 side has a memory area corresponding to the 1st to Mth addresses as shown in FIG. It consists of three parameters: a write buffer position (WB), a read buffer position (RB), and a buffering number (NB).

  Here, M is an integer of 1 or more and represents the number of the maximum value of the data storage area in the memory area.

  The write buffer position (WB) indicates the position of the memory area that stores the activation control data read by the SIRCS receiver 244a. The read buffer position (RB) indicates the position of the memory area to be read to the data register 244b-2 of the UART transmission unit 244b. Further, the buffering number (NB) indicates the amount of data stored in the memory area. In the buffer unit 244c, in the initial setting state, as shown in FIG. 9A, the write buffer position (WB) and the read buffer position (RB) are the first addresses in the memory area, and the buffering number (NB) is set to 0. Further, specific examples of each parameter when the input / output processing is performed in the buffer unit 244c are as follows. As shown in FIG. 9B, the write buffer position (WB) is the eighth in the memory area. The read buffer position (RB) is fifth. In this case, the buffering number that is the number of data stored in the memory area is 3, which is the difference between the write buffer position (WB) and the read buffer position (RB).

  Next, the activation control data input / output process executed by the buffer unit 244c will be described in detail with reference to FIG.

  First, the activation control unit 244 is in a standby state, recognizes the activation control signal transmitted from the control signal I / F unit 23 as a simple High / Low signal, and activates the input / output processing steps described below. The buffer unit 244c is assumed to execute.

  In step S <b> 51, the buffer unit 244 c is activated by being supplied with power from the activation control unit 244 according to a command from the activation control unit 244.

  In step S52, the buffer unit 244c performs initial setting of the parameters WB, RB, and NB as shown in FIG. 9A in accordance with an instruction from the activation control unit 244. That is, each parameter is set to WB = 1, RB = 1, and NB = 0 as shown in FIG.

  In step S <b> 53, the buffer unit 244 c determines whether an activation control signal input request command is input from the SIRCS reception unit 244 a according to the command from the activation control unit 244. When the input request command is input from the SIRCS receiving unit 244a, the buffer unit 244c proceeds to step S54. Further, when the input request command from the SIRCS receiving unit 244a is not input, the buffer unit 244c proceeds to Step S61.

  In step S54, the buffer unit 244c determines whether the buffering number (NB) is larger than M, which is the maximum value of the memory area, according to the buffering program. If the buffering number (NB) is equal to or smaller than M, the input / output processing step proceeds to step S55. If the buffering number (NB) is larger than M, the process proceeds to step S56.

  In step S55, the buffer unit 244c reads the activation control data stored in the data register 244a-2 by an instruction from the activation control unit 244, writes the activation control data in the memory area corresponding to the write buffer position, and The present input / output processing step proceeds to step S57.

  In step S56, the buffer unit 244c has a buffering number greater than M and cannot newly write activation control data into the memory area, so that it cannot be written into the memory area by an instruction from the activation control unit 244. The overflow information is output to the SIRCS receiver 244a, and the input / output process is advanced to step 60.

  In step S57, the buffer unit 244c determines whether or not the buffering number (NB) is M based on an instruction from the activation control unit 244. In this input / output processing step, when the buffering number (NB) is determined to be M, the process proceeds to step S58, and when it is determined that the buffering number (NB) is not M, the process proceeds to step S59. move on. In consideration of the fact that the buffering number (NB) is determined to be M or less in step S54, the buffering number (NB) is less than M when the process proceeds to step S59. This is the case.

  In step S58, the buffer unit 244c sets the write buffer position (WB) to 0 in accordance with an instruction from the activation control unit 244, and advances the processing process to step S60.

  In step S59, the buffer unit 244c increments the write buffer position (WB) according to the command from the activation control unit 244, sets it to the WB + 1th position, and advances the input / output processing step to step S60.

  In step S60, the buffer unit 244c receives a command from the activation control unit 244, and in response to the activation control data newly written in step S55 and stored in the memory area by one, the buffer unit 244c The number of rings (NB) is incremented and set to the NB + 1st position, and this input / output processing step is returned to step S53.

  In step S <b> 61, the buffer unit 244 c determines whether or not an activation request signal output request command is input from the UART encoder unit 244 b-1 according to the command from the activation control unit 244. When the output request command is input from the UART encoder unit 244b-1, the buffer unit 244c advances the input / output processing step to step S62. If the output request command from the UART encoder unit 244b-1 is not input to the buffer unit 244c, the input / output processing step is returned to step S53, and the process of step S61 is repeated until the output request command is input.

  In step S62, the buffer unit 244c determines whether or not the buffering number (NB) is 1 or more, that is, activation control data is stored in the memory area, according to an instruction from the activation control unit 244. Here, this input / output processing step proceeds to step S63 when the buffering number (NB) is 1 or more, and returns to step S53 when the buffering number (NB) is less than 1, that is, 0.

  In step S63, the buffer unit 244c refers to the activation control data in the memory area stored in the read buffer position (RB) according to the instruction from the activation control unit 244, and stores it in the data register 244b-2 of the UART transmission unit 244b. On the other hand, the activation control data is output.

  In step S <b> 64, the buffer unit 244 c determines whether the read buffer position (RB) is the Mth in accordance with an instruction from the activation control unit 244. This input / output processing step proceeds to step S65 when the read buffer position (RB) is Mth, and proceeds to step S66 when the read buffer position (RB) is not Mth, that is, 0th to (M-1) th. move on.

  In step S65, the buffer unit 244c initializes the read buffer position (RB) to 0 in accordance with an instruction from the activation control unit 244, and advances the input / output processing step to step S67.

  In step S66, the buffer unit 244c increments the read buffer position (RB) by the command from the activation control unit 244, sets it to RB + 1, and proceeds to step S67.

  In step S67, the buffer unit 244c outputs the activation control data to the UART transmission unit 244b in step S63 according to an instruction from the activation control unit 244, and the activation control data stored in the memory area has decreased by one. Accordingly, the buffering number (NB) is decremented and set to NB-1st. Further, the present input / output processing step returns to step S53.

  As described above, the buffer unit 244c is activated by using an instruction from the activation control unit 244 using the M memory storage areas and the three parameters WB, RB, and NB that refer to the usage status of the memory storage areas. Performs control data input / output processing. Note that the buffer unit 144c included in the activation control unit 144 of the source device 10 also performs activation control data input / output processing in the same manner as the buffer unit 244c described above.

  Next, in the activation control unit 244 of the monitor device 20, an activation control process including the input / output processing process of the buffer unit 244 c will be described in detail with reference to FIGS. 11 and 12. First, the operation of the SIRCS reception unit 244a that reads the activation control data output from the control signal I / F unit 23 based on the SIRCS signal standard will be described with reference to FIG.

  In step S101, the SIRCS receiving unit 244a is supplied with power from the activation control unit 244 according to the activation control program, and shifts to a normal operation state. Here, the activation control unit 244 determines a high / low change in the activation control signal output from the control signal I / F unit 23, shifts from the standby state to the normal operation state, and operates the SIRCS reception unit 244a in the normal operation. Transition to the state.

  In step S102, the SIRCS receiver 244a initializes the memory storage area of the data register 244a-2 according to the activation control program.

  In step S103, the SIRCS receiver 244a determines whether an activation control signal of the SIRCS signal standard is transmitted according to the activation control program. Here, when it is determined that the activation control signal of the SIRCS signal standard is transmitted to the SIRCS receiver 244a, the process proceeds to step S104, and when it is determined that the activation control signal of the SIRCS signal standard is not transmitted. Step S103 is repeated.

  In step S104, the SIRCS receiver 244a reads activation control data from the transmitted activation control signal of the SIRCS signal standard in accordance with the activation control program. Specifically, the SIRCS decoding unit 244a-1 provided in the SIRCS receiving unit 244a reads the activation control data transmitted based on the SIRCS signal standard.

  In step S105, the SIRCS receiving unit 244a causes the SIRCS decoding unit 244a-1 to transmit the read activation control data to the data register 244a-2 according to the activation control program. The data register 244a-2 stores the activation control data transmitted from the SIRCS decoder unit 244a-1 in the memory storage area.

  In step S106, the SIRCS receiving unit 244a causes the SIRCS decoding unit 244a-1 to output an input request instruction for inputting activation control data to the buffer unit 244c to the buffer unit 244c in accordance with the activation control program. Specifically, the input request command is a control command that causes the SIRCS decoder unit 244a-1 to output the activation control data stored in the data register 244a-2 to the buffer unit 244c and that is output to the buffer unit 244c.

  In step S107, the SIRCS receiving unit 244a stores the activation control data stored in the data register 244a-2 in the buffer unit 244c in response to the input request command in step S106, in accordance with the activation control program. Store in the memory area.

  In step S108, the SIRCS reception unit 244a determines whether the activation control data stored in the memory area of the data register 244a-2 has been read by the buffer unit 244c for the data register 244a-2 according to the activation control program. Determine whether. Here, in the activation control program, when all the activation control data stored in the data register 244a-2 are read out to the buffer unit 244c, the process returns to step S102. If all the activation control data stored in the data register 244a-2 has not been read out to the buffer unit 244c, the process of step S108 is repeated.

  As described above, the SIRCS receiving unit 244a reads the activation control data based on the SIRCS signal standard, and causes the buffer unit 244c to store the activation control data.

  Next, the UART transmission unit 244b that transmits the activation control signal of the UART signal standard according to the activation control data stored in the buffer unit 244c will be described with reference to FIG.

  In step S111, the UART transmission unit 244b is supplied with power from the activation control unit 244 according to the activation control program, and shifts to a normal operation state. Here, the activation control unit 244 determines a High / Low change in the activation control signal output from the control signal I / F unit 23 and shifts from the standby state to the normal operation state, and the SIRCS reception unit 244a is normally connected. Transition to the operating state.

  In step S112, the UART transmission unit 244b initializes the memory storage area of the data register 244b-2 according to the activation control program.

  In step S113, the UART transmission unit 244b transmits, to the buffer unit 244c, an output request command for requesting the buffer unit 244c from the UART encoder unit 244b-1 to the UART encoder unit 244b-1 according to the activation control program. Let

  In step S114, the UART transmission unit 244b causes the buffer unit 244c to transmit activation control data to the data register 244b-2 according to the output request command in accordance with the activation control program.

  In step S115, the UART transmission unit 244b causes the buffer unit 244c to determine whether transmission of the activation control data to the data register 244b-2 is completed according to the output request command in accordance with the activation control program. Here, the activation control program proceeds to step S116 when it is determined that the transmission of the activation control data is completed in response to the output request command, and proceeds to step S115 when it is determined that the transmission process is not completed. Repeat.

  In step S116, the UART transmission unit 244b causes the buffer unit 244c to stop the output request command in accordance with the activation control program. That is, the buffer unit 244c stops transmission of the activation control data to the data register 244b-2.

  In step S117, the UART transmission unit 244b causes the data register 244b-2 to output the activation control information stored in the memory storage area of the register to the UART encoder unit 244b-1 according to the activation control program.

  In step S118, the UART transmission unit 244b converts the activation control data output from the data register 244b-2 to the activation control signal based on the UART signal standard to the UART encoder unit 244b-1 according to the activation control program. Let

  In step S119, the UART transmission unit 244b causes the UART encoder unit 244b-1 to transmit the activation control signal converted into the UART signal standard to the E / O conversion unit 242 according to the activation control program.

  In step S120, the UART transmission unit 244b determines whether or not the UART encoder unit 244b-1 has completed transmission of the activation control signal based on the UART signal standard according to the activation control program. Here, when it is determined that the transmission of the activation control signal by the UART encoder unit 244b-1 is completed, the activation control program returns to step S112, and when it is determined that the transmission process is not completed, step S120. Repeat the process.

  Next, the activation control process to which the buffering process is added in the activation control unit 144 of the source device 10 will be described with reference to FIGS. 13 and 14.

  The UART receiving unit 144a of the source device 10 performs the same processing steps as the SIRCS receiving unit 244a of the monitor device 20 described above. Specifically, the processing steps shown in steps S101 to S108 in FIG. 11 for reading the startup control signal from the startup control signal of the SIRCS signal standard correspond to the processing steps shown in steps S201 to S208 in FIG. 13, and the UART receiver 144a. Then, the activation control signal is read from the activation control signal of the UART signal standard.

  The SIRCS transmission unit 144b of the source device 10 performs the same processing steps as the UART transmission unit 244b of the monitor device 20 described above. Specifically, each of the processing steps shown in steps S111 to S120 in FIG. 12 for converting the startup control data stored in the buffer unit 244c into a startup control signal of the UART signal standard, and the processing steps shown in steps S211 to S220 in FIG. And the SIRCS transmission unit 144b converts the activation control data stored in the buffer unit 144c into an activation control signal of the SIRCS signal standard.

  In this manner, the activation control unit 244 in the monitor device 20 adjusts the time for sending the activation signal of the UART signal standard by temporarily storing the activation control data in the buffer unit 244c. As a result, the activation control unit 244 converts the frequency component of the signal into an activation control signal of a lower UART signal standard with respect to the activation control signal of the SIRCS signal standard, as shown in FIG. Can be sent to. In addition, the activation control unit 144 in the source device 10 temporarily stores the activation control data in the buffer unit 144c so that the activation control signal of the UART signal standard transmitted from the monitor device 20 via the optical transmission cable 30 is received. It can be converted into the SIRCS signal standard and transmitted to the source body 11.

  Further, as shown in FIG. 16, the activation control unit 244 transmits an activation control signal in which a space is inserted between each bit data of the activation control data read from the buffer unit 244c to the E / O conversion unit 242, and the unit An optical signal with a shortened light emission time per time is generated and transmitted through the optical transmission cable 30. By such signal processing, highly safe optical transmission that does not damage human eyes can be performed.

  The activation control process shown in the present embodiment includes a transmission activation command process for outputting an activation control signal to the E / O converter and transmitting it to the other device via the optical signal cable 30 and the activation to be transmitted. Activation control programs that perform two processes, a reception activation control process that activates in response to a control signal, are incorporated in the activation control units 144 and 244, respectively. Further, in the present embodiment, an activation processing step is illustrated in which the activation control unit 244 of the monitor device 20 performs transmission activation instruction processing, and the activation control unit 144 of the source device 10 performs reception activation control processing. However, the activation control unit 144 of the source device 10 performs the transmission activation command process and the activation control unit 244 of the monitor device 20 performs the reception activation control process without being limited to such an activation process step. Each processing block may be configured to set a program. Further, each processing block in the activation control unit may be configured to set a program so that the activation control units 144 and 244 perform both the transmitter path command process and the reception activation control process.

  Furthermore, the present invention is not limited to the video signal of the embodiment described above that is transmitted as an optical signal, but may be an audio signal or information data other than a video signal as long as the startup control is performed via an optical transmission cable. May be applied to a transmission system that transmits an optical signal.

It is the schematic diagram which showed the structure of the optical transmission system. It is the wave form diagram which showed an example of the signal waveform of a SIRCS (Serial Infrared Remote Control System) signal standard. It is the schematic diagram which showed the structure of the source device. It is the wave form diagram which showed an example of the signal waveform of a UART (Universal Asynchronous Receiver Transmitter) signal specification. It is the schematic diagram which showed the structure of the monitor apparatus. It is the flowchart which showed the starting control process in an optical transmission system. It is the schematic diagram which showed the structure of the starting control part of a monitor apparatus. It is the schematic diagram which showed the structure of the starting control part of a source device. It is the schematic diagram which showed the structure of the memory area of a buffer part. It is the flowchart which showed the input / output processing process of the starting control data in a buffer part. It is the flowchart which showed the input / output processing process of the starting control data in the SIRCS receiving part of the starting control part of a monitor apparatus. It is the flowchart which showed the input / output processing process of the starting control data in the UART transmission part of the starting control part of a monitor apparatus. It is the flowchart which showed the input / output processing process of the starting control data in the UART receiving part of the starting control part of a source device. It is the flowchart which showed the input / output processing process of the starting control data in the SIRCS transmission part of the starting control part of a source device. It is the wave form diagram which compared the signal waveform of SIRCS signal standard and UART signal standard. It is the wave form diagram which showed the transmission signal of the UART signal specification which inserted the space between bit data. It is the schematic diagram which showed the structure of the transmission system with which a video signal is transmitted with an electrical signal.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Optical transmission system, 10 source apparatus, 11 source main-body part, 20 monitor apparatus, 21 monitor main-body part, 12, 22 video signal I / F, 13, 23 control signal I / F, 14 source transmission processing part, 24 monitor transmission Processing unit, 141, 241 Electrical signal processing unit, 142, 242 E / O conversion unit, 143, 243 O / E conversion unit, 144, 244 Start control unit, 30 Optical signal cable, 40 Infrared remote controller

Claims (24)

In an optical transmission system comprising a first signal transmission device and a second signal transmission device connected via an optical transmission cable for transmitting a predetermined transmission signal,
The first signal transmission device includes a first electrical / optical signal conversion unit that converts the transmission signal in an electrical signal format into an optical signal format, and a transmission from the second signal transmission device via the optical transmission cable. A first optical / electrical signal conversion unit that converts the transmission signal in the optical signal format to an electrical signal format, and a first activation control unit that performs control to shift from the standby state to the normal operation state,
The second signal transmission device includes a second electric / optical signal converter that converts the transmission signal in the electric signal format into an optical signal format, and transmits the signal from the first signal transmission device via the optical transmission cable. A second optical / electrical signal conversion unit that converts the transmission signal in the optical signal format to an electrical signal format, a second activation control unit that performs control to shift from the standby state to the normal operation state, and an infrared signal An infrared light receiving unit that receives a transmission signal from an infrared remote controller to transmit and converts it into an electrical signal format ,
The second signal transmission device, into an electrical signal format with the infrared receiver of the activation control signal of an infrared signal standard for controlling the transition from the wait state that will be transmitted from the infrared remote controller to the normal operation state is received converted and transmitted to the second activation control unit, the second activation control unit is the second electrical / optical signal converter in response to the start control signal of the infrared signal standard that is transmitted from the infrared receiving section part start, the start control signal is converted into the infrared signal standard than the transmission frequency band is lower transmission signal standard and transmitted to the second electrical / optical signal conversion unit, said second electrical / optical signal converter The unit converts the activation control signal of the transmission signal standard in the electrical signal format into an optical signal format and transmits the optical signal format to the first signal transmission device in a standby state,
In the first signal transmission device, the start control signal in the optical signal format transmitted from the second signal transmission device via the optical transmission cable is transmitted to the first optical / electrical signal conversion unit in the electrical signal format. is converted into and transmitted to the first activation control unit reads the startup control information the first activation control unit converts the start control signal from the transmission signal standard to the infrared signal standard, upper Symbol start According to the control information, it shifts from the standby state to the normal operation state,
An optical transmission system for transmitting the transmission signal between the second signal transmission device and the first signal transmission device via the optical transmission cable. The transmission signal is a video signal,
The first signal transmission device includes a video signal transmission unit that transmits a video signal,
The second signal transmission device includes a video signal receiving unit that receives the video signal,
It said first signal transmission device, the said video signal from the video signal transmission unit transmits to said first electrical / optical signal conversion unit, said first electric / optical signal conversion section is an optical signal to the video signal Converted into a format and transmitted to the second signal transmission device via the optical signal cable,
The second signal transmission device converts the video signal transmitted via the optical signal cable into an electrical signal format by the second optical / electrical signal conversion unit, and the video signal receiving unit converts the video signal to the video signal. The optical transmission system according to claim 1, wherein: The transmission signal is a video signal,
  The second signal transmission device includes a video signal transmission unit that transmits a video signal,
  The first signal transmission device includes a video signal receiving unit that receives the video signal,
  The second signal transmission device transmits the video signal from the video signal transmitter to the second electrical / optical signal converter, and the second electrical / optical signal converter transmits the video signal to an optical signal. Converted into a format and transmitted to the first signal transmission device via the optical signal cable,
  The first signal transmission device converts the video signal transmitted via the optical signal cable into an electrical signal format by the first optical / electrical signal conversion unit, and the video signal reception unit converts the video signal to the video signal. The optical transmission system according to claim 1, wherein: A signal transmission device connected to another signal transmission device via an optical transmission cable in an optical transmission system for transmitting a predetermined transmission signal,
An electrical / optical signal converter for converting the transmission signal in electrical signal format into an optical signal format;
An optical / electrical signal converter that converts the transmission signal in the optical signal format transmitted from another signal transmission device connected via the optical transmission cable into an electrical signal format;
An activation control unit that performs control to shift from the standby state to the normal operation state ;
Infrared light receiving unit that receives the transmission signal of the infrared remote controller that transmits the infrared signal of the infrared signal standard and converts it into an electrical signal format,
The infrared light receiving portion, that are sent from the infrared remote controller performs control to shift from the standby state to the normal operating state into an electric signal format as well as receiving a start control signal of the infrared signal standards the start control unit To
The activation control unit activates the electrical / optical signal conversion unit in response to the activation control signal of the infrared signal standard transmitted from the infrared light receiving unit,
The activation control signal is converted into a transmission signal standard whose transmission frequency band is lower than the infrared signal standard and transmitted to the electrical / optical signal conversion unit,
The electrical / optical signal conversion unit converts the activation control signal of the transmission signal standard in electrical signal format into an optical signal format and transmits the optical signal format to the other signal transmission device in a standby state via the optical transmission cable;
In response to the activation control signal, the other signal transmission device is shifted from the standby state to the normal operation state,
A signal transmission device that transmits the transmission signal to and from the other signal transmission device via the optical transmission cable. The transmission signal is a video signal,
A video signal transmitter for transmitting the video signal in electrical signal format;
The video signal transmission unit transmits the video signal in the electrical signal format to the electrical / optical signal conversion unit,
5. The signal transmission device according to claim 4, wherein the electrical / optical signal conversion unit converts the video signal in the electrical signal format into an optical signal format and transmits the optical signal format to the other signal transmission device via the optical transmission cable. The transmission signal is a video signal,
A video signal receiving unit for receiving the video signal in electrical signal format;
The optical / electrical signal converter converts the video signal in the optical signal format transmitted from the other signal transmission device via the optical transmission cable into an electrical signal format,
The signal transmission apparatus according to claim 4, wherein the video signal receiving unit receives the video signal in an electrical signal format. A signal transmission device connected to another signal transmission device via an optical transmission cable in an optical transmission system for transmitting a predetermined transmission signal,
An electrical / optical signal converter for converting the transmission signal in electrical signal format into an optical signal format;
An optical / electrical signal converter that converts the transmission signal in the optical signal format transmitted from another signal transmission device connected via the optical transmission cable into an electrical signal format;
An activation control unit that performs control to shift from the standby state to the normal operation state,
A standby signal transmission standard whose transmission frequency band is lower than that of the infrared signal standard received by the infrared light receiving unit of the other signal transmission device and transmitted from the other signal transmission device via the optical transmission cable. The optical / electrical signal conversion unit converts an optical signal format activation control signal for performing control to shift from a state to a normal operation state, and transmits the electric signal format to the activation control unit,
The activation control unit, a start control signal of the transmission signal standards reads a start control information is converted into the infrared signal standard,
The activation control unit shifts from a standby state to a normal operation state according to the activation control information,
A signal transmission device that transmits the transmission signal to and from the other signal transmission device via the optical transmission cable. The transmission signal is a video signal,
A video signal transmitter for transmitting the video signal in electrical signal format;
The video signal transmission unit transmits the video signal in the electrical signal format to the electrical / optical signal conversion unit,
8. The signal transmission device according to claim 7, wherein the electrical / optical signal conversion unit converts the video signal in an electrical signal format into an optical signal format and transmits the optical signal format to the other signal transmission device via the optical transmission cable. The transmission signal is a video signal,
A video signal receiving unit for receiving the video signal in electrical signal format;
The video signal in the optical signal format transmitted from the other signal transmission device via the optical transmission cable is converted into an electrical signal format by the optical / electrical signal converter,
The signal transmission device according to claim 7, wherein the video signal receiving unit receives the video signal in an electrical signal format. An optical transmission method in an optical transmission system comprising a first signal transmission device and a second signal transmission device connected via an optical transmission cable for transmitting a predetermined transmission signal,
Second signal transmission device, into an electric signal format by receiving the activation control signal of an infrared signal standard for controlling the transition from the wait state that will be transmitted from the infrared remote controller to the normal operation state, the infrared signal standard In response to the activation control signal, a transition is made from a standby state to a normal operation state, the activation control signal is converted to a transmission signal standard having a transmission frequency band lower than the infrared signal standard , and the activation control signal in the form of an electric signal is optically transmitted. Converted into a signal format and transmitted to the first signal transmission device in a standby state via the optical transmission cable,
The first signal transmission device converts the activation control signal in the optical signal format transmitted from the second signal transmission device through the optical transmission cable into an electrical signal format, and the activation control in the electrical signal format. The signal is converted from the transmission signal standard to the infrared signal standard to read the activation control information, and the standby state is changed to the normal operation state according to the activation control information.
An optical transmission method for transmitting the transmission signal between the second signal transmission apparatus and the first signal transmission apparatus via the optical transmission cable. The transmission signal is a video signal,
The first signal transmission device outputs the video signal in the electrical signal format, converts the output video signal in the electrical signal format into an optical signal format, and transmits the second signal via the optical signal cable. Transmitted to the device,
11. The optical signal according to claim 10, wherein the second signal transmission device converts the video signal in the optical signal format transmitted through the optical signal cable into an electrical signal format and receives the video signal in the electrical signal format. Transmission method. The transmission signal is a video signal,
  The second signal transmission device outputs the video signal in the electrical signal format, converts the output video signal in the electrical signal format into an optical signal format, and transmits the first signal via the optical signal cable. Transmitted to the device,
  11. The optical signal according to claim 10, wherein the first signal transmission device converts the video signal in the optical signal format transmitted through the optical signal cable into an electrical signal format and receives the video signal in the electrical signal format. Transmission method. A method for controlling a signal transmission device connected to another signal transmission device via an optical transmission cable in an optical transmission system for transmitting a predetermined transmission signal,
Infrared that are sent from the remote controller, and converted into an electrical signal format by receiving the activation control signal of an infrared signal standard for controlling the transition from the standby state to the normal operation state,
Transition from the standby state to the normal operation state in accordance with the start control signal of the infrared signal standard,
The activation control signal of the infrared signal standard is converted into a transmission signal standard whose transmission frequency band is lower than the infrared signal standard ,
The start control signal in electrical signal format is converted to optical signal format and transmitted to the other signal transmission device in the standby state via the optical transmission cable,
In response to the activation control signal, the other signal transmission device is shifted from the standby state to the normal operation state,
A control method for a signal transmission apparatus that transmits the transmission signal to and from the other signal transmission apparatus shifted to a normal operation state via the optical transmission cable. The transmission signal is a video signal,
Output the above video signal in electrical signal format,
The output video signal in the electrical signal format is converted to the optical signal format,
Transmit the converted optical signal format to the other signal transmission device via the optical transmission cable,
14. The signal according to claim 13, wherein the other signal transmission device converts the video signal in the optical signal format transmitted through the optical transmission cable into an electrical signal format and receives the video signal in the electrical signal format. A method for controlling a transmission apparatus. The transmission signal is a video signal,
The video signal in the optical signal format transmitted from the other signal transmission device via the optical transmission cable is converted into an electrical signal format,
14. The method of controlling a signal transmission device according to claim 13, wherein the video signal in the electrical signal format is received. A method for controlling a signal transmission device connected to another signal transmission device via an optical transmission cable in an optical transmission system for transmitting a predetermined transmission signal,
A standby signal transmission standard whose transmission frequency band is lower than that of the infrared signal standard received by the infrared light receiving unit of the other signal transmission device and transmitted from the other signal transmission device via the optical transmission cable. Convert the start control signal in the optical signal format that controls the transition from the normal state to the normal operation state into the electrical signal format,
The activation control signal of the electrical signal format read a start control information is converted into the infrared signal standard from the transmission signal standard,
The activation control unit shifts from a standby state to a normal operation state according to the activation control information,
A control method of a signal transmission device that transmits the transmission signal via the optical transmission cable to and from the other signal transmission device shifted to a normal operation state. The transmission signal is a video signal,
Send the above video signal in electrical signal format,
17. The signal transmission device control method according to claim 16, wherein the video signal in the electric signal format is converted into an optical signal format and transmitted to the other signal transmission device via the optical transmission cable. The transmission signal is a video signal,
The video signal in the optical signal format transmitted from the other signal transmission device via the optical transmission cable is converted into an electrical signal format,
17. The method of controlling a signal transmission apparatus according to claim 16, wherein the video signal in electrical signal format is received. A control program executed by a computer mounted on a signal transmission device connected to another signal transmission device via an optical transmission cable in an optical transmission system for transmitting a predetermined transmission signal,
It is an infrared signal standard transmitted from an infrared remote controller, receives a start control signal for performing control to shift from a standby state to a normal operation state, converts it into an electrical signal format,
Transition from the standby state to the normal operation state in accordance with the start control signal of the infrared signal standard,
The activation control signal of the infrared signal standard is converted into a transmission signal standard whose transmission frequency band is lower than the infrared signal standard ,
The activation control signal of the transmission signal standard in the electrical signal format is converted into an optical signal format and transmitted to the other signal transmission device in the standby state via the optical transmission cable,
In response to the activation control signal, the other signal transmission device is shifted from the standby state to the normal operation state,
A control program for performing control of transmitting the transmission signal via the optical transmission cable to and from the other signal transmission apparatus that has shifted to a normal operation state. The transmission signal is a video signal,
Output the above video signal in electrical signal format,
The output video signal in the electrical signal format is converted to the optical signal format,
Transmit the converted optical signal format to the other signal transmission device via the optical transmission cable,
It said other signal transmission device converts the video signal of the optical signal format which is transmitted through the optical transmission cable to an electrical signal format, claim 19 for performing control for receiving said video signal of an electrical signal format The described control program. The transmission signal is a video signal,
The video signal in the optical signal format transmitted from the other signal transmission device via the optical transmission cable is converted into an electrical signal format,
The control program according to claim 19, wherein control for receiving the video signal in electrical signal format is performed. A method for controlling a signal transmission device connected to another signal transmission device via an optical transmission cable in an optical transmission system for transmitting a predetermined transmission signal,
A standby signal transmission standard whose transmission frequency band is lower than that of the infrared signal standard received by the infrared light receiving unit of the other signal transmission device and transmitted from the other signal transmission device via the optical transmission cable. Convert the start control signal in the optical signal format that controls the transition from the normal state to the normal operation state into the electrical signal format,
The activation control signal of the electrical signal format read a start control information is converted into the infrared signal standard from the transmission signal standard,
The activation control unit shifts from a standby state to a normal operation state according to the activation control information,
A control program for performing control to transmit the transmission signal via the optical transmission cable to and from the other signal transmission apparatus that has shifted to a normal operation state. The transmission signal is a video signal,
Send the above video signal in electrical signal format,
The control program according to claim 22, wherein control is performed to convert the video signal in the electrical signal format into an optical signal format and transmit the converted video signal to the other signal transmission device via the optical transmission cable. The transmission signal is a video signal,
The video signal in the optical signal format transmitted from the other signal transmission device via the optical transmission cable is converted into an electrical signal format,
The control program according to claim 22, wherein control for receiving the video signal in the electric signal format is performed.

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