JP2020036135A - Video transmitting device, information processing method, and program - Google Patents

Abstract

To provide a video transmitting device that allows a video receiving device to reproduce video data without a user performing an operation such as a change in device settings is obtained even when an error occurs due to a problem on a communication path.SOLUTION: A video transmitting device includes a transmitting unit that transmits video data to a video receiving device, an error detection unit that detects occurrence of an error on the basis of information indicating a connection state of the video receiving device, a first storage unit that stores a plurality of formats in the video data to be transmitted to the video receiving device, and a second storage unit, and the transmitting unit transmits the video data to the video receiving device in which the error has been detected in a format having a smaller processing load than the format in which the error has occurred from among a plurality of formats, and the second storage unit stores identification information of the video receiving device in which the error has been detected and a format with a small processing load, which has been transmitted to the video receiving device in association with each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a video transmission device for transmitting video data, an information processing method, and a program for causing a computer to execute the method.

  A video transmission device of the conventional High-Definition Multimedia Interface (HDMI) (registered trademark, hereinafter abbreviated) standard has a reproducible resolution, a reproducible color depth, and a receivable frequency according to the capability of the video receiving device. Send data. However, the video receiving apparatus cannot automatically solve the problem when the received data cannot be normally reproduced due to a problem on the communication path. As a result, a problem may occur in the video reproduction performed by the video receiving device, and the convenience for the user may be impaired.

  To address this problem, there has been proposed a signal receiving apparatus that detects an error from a Transition Minimized Differential Signaling (TMDS) signal received from a signal transmitting apparatus (for example, see Patent Document 1). The signal receiving device disclosed in Patent Document 1 detects an error rate when receiving an HDMI signal. The signal receiving apparatus transmits signal information corresponding to the HDMI signal having the smallest error rate among the error rates detected in the past to the signal transmitting apparatus to perform signal correction.

  The signal receiving apparatus disclosed in Patent Literature 1 always performs an error check on the TMDS signal, thereby increasing the processing load and power consumption. Further, the error cannot be detected only on the signal transmission device side. Further, both the signal transmission device and the signal reception device need to have a signal adjustment function, and are not compatible with existing video reception devices.

  As another countermeasure, a method is disclosed in which resolution information desired by a user is fixed in advance (for example, see Patent Document 2). In the method disclosed in Patent Document 2, as a means for changing a plurality of pieces of resolution information stored in a television device, a plurality of resolution information that can be selected by a user of the television device is not recorded, and the resolution information is switched to a desired resolution information in advance. Is to be recorded. For example, when the transmitter reads the resolution information recorded on the television device side, it recognizes that only one resolution can be supported, thereby enabling resolution switching by a user operation on the television device side. .

JP 2014-17819 A JP 2007-158903 A

  In the method disclosed in Patent Literature 2, since the resolution of the television device is set in advance, video data may not be able to be reproduced due to a problem occurring in the communication path. Even if the user can recognize the occurrence of an error by using the technology disclosed in Patent Document 1, it is difficult for a user who is not familiar with the television device disclosed in Patent Document 2 to change the resolution, and it is difficult for the user to change the resolution. Can not respond to the problem.

  A video transmission device according to the present invention includes a transmission unit that transmits video data to a video reception device, and a transmission unit that transmits video data to the video reception device, based on information indicating a connection state of the video reception device. An error detection unit that detects the occurrence of an error, a first storage unit that stores a plurality of formats in the video data transmitted to the video reception device, and identification information of the video reception device in which the occurrence of the error is detected, A second storage unit that stores the format of the video data transmitted to the video receiving device in association with the video receiving device, wherein the transmitting unit transmits the video data to the video receiving device in which the error is detected. Transmitting the video data in a format having a smaller processing load than the format in which the error has occurred, among a plurality of formats stored in one storage unit;憶部 includes identification information of the video receiving apparatus the error is detected and transmitted to the video receiver, and stores in association with the small formats of the processing load.

  An information processing method according to the present invention is an information processing method by a video transmitting device for transmitting video data to a video receiving device, wherein the video receiving device stores a plurality of formats in the video data to be transmitted to the video receiving device, Based on information indicating the connection state of the video receiving device, which is transmitted from the device, detects the occurrence of an error in the video receiving device, and, for the video receiving device in which the occurrence of the error is detected, The video data is transmitted in a format having a smaller processing load than the format in which the error has occurred among the formats, the identification information of the video receiving device in which the error is detected, and the processing load transmitted to the video receiving device. Is stored in association with a small format.

  A program according to the present invention includes: a computer that transmits video data to a video receiving device; a unit that stores a plurality of formats in the video data to be transmitted to the video receiving device; and a video that is transmitted from the video receiving device. Means for detecting the occurrence of an error in the video receiving device based on the information indicating the connection state of the receiving device, and, for the video receiving device in which the occurrence of the error is detected, Means for transmitting the video data in a format having a smaller processing load than the format in which the error occurred, identification information of the video receiving device in which the error was detected, and a format in which the processing load was transmitted to the video receiving device, and Are made to function as a means for storing them in association with each other.

  According to the present invention, even if an error occurs in the video receiving device due to a problem on the communication path, the video format to be used is sequentially changed to a video format with a low processing load. Therefore, the video receiving device can normally reproduce the video data even if the user does not perform an operation such as a change in the setting of the device.

FIG. 1 is a diagram illustrating a configuration example of a video reproduction system including a video transmission device according to Embodiment 1 of the present invention. FIG. 2 is a block diagram illustrating a configuration example of an error detection unit illustrated in FIG. 1. FIG. 2 is a diagram illustrating an example of information held by a display information holding unit illustrated in FIG. 1. FIG. 2 is a diagram illustrating an example of an EDID stored in an EDID memory illustrated in FIG. 1. 3 is a flowchart illustrating an operation procedure of an information processing method executed by the video transmission device illustrated in FIG. 1. 5 is a flowchart illustrating an operation procedure of another information processing method executed by the video transmission device illustrated in FIG. 1. FIG. 2 is a sequence diagram illustrating an operation procedure of the video reproduction system illustrated in FIG. 1.

Embodiment 1 FIG.
A configuration of a video reproduction system including the video transmission device according to the first embodiment will be described. FIG. 1 is a diagram showing a configuration example of a video reproduction system including a video transmission device according to Embodiment 1 of the present invention. As shown in FIG. 1, the video reproduction system includes a video transmission device 10 and a video reception device 20. The video transmitting device 10 is connected to the video receiving device 20 via the HDMI cable 30.

  The HDMI cable 30 includes a TMDS (Transition Minimized Differential Signaling) channel 31, a display data channel (hereinafter referred to as DDC) 32, a CEC (Consumer Electronics Control) line 33, a Utility line 34, and an HPD (Hot). Plug detector) line 35.

  The TMDS channel 31 is used for transmitting a clock signal of one channel and TMDS data of three channels. For example, when the color format is RGB, out of the three channels of TMDS data, video data of B (blue), a vertical synchronization signal and a horizontal synchronization signal, and control data such as a packet header are allocated to TMDS channel 0. Have been. G (green) video data, audio data, and control data such as a preamble indicating a data break are allocated to the TMDS channel 1. The TMDS channel 2 is assigned R (red) video data, audio data, and control data such as a preamble. Here, the case where the color format is RGB has been described, but the color format may be YCbCr. When the color format is RGB, the color depth is not limited to 24 bits, and a deep color mode exceeding 24 bits may be used.

  The DDC 32 is used for transmitting EDID (Extended Display Identification Data) from the video receiving device 20 to the video transmitting device 10. The DDC 32 is used by the video transmission device 10 to authenticate the video reception device 20 and transmit an HDCP (High-bandwidth Digital Content Protection) key used for encrypting content such as video data. The EDID is a data set including display information such as a video format that the video receiving device 20 can support. In the DDC 32, data is transmitted and received between the video transmitting device 10 and the video receiving device 20 according to a determined communication protocol. When the EDID is transmitted from the video reception device 20 to the video transmission device 10 via the DDC 32, the slave address of the video reception device 20 is attached to the EDID in the transmission source header indicating the transmission source. The slave address is an example of identification information that is unique information for specifying the video receiving device 20.

  The CEC line 33 is used to transmit CEC commands for controlling peripheral devices such as power supply interlocking between devices and remote control control interlocking. The HPD line 35 is used to notify the video transmission device 10 whether or not the video reception device 20 can receive the TMDS data. When data communication is performed between the video transmitting apparatus 10 and the video receiving apparatus 20 using an Ethernet (registered trademark) communication channel (HEC: HDMI Ethernet (registered trademark) Channel) and an ARC (Audio Return Channel), the HEAC line is connected to the HDMI. The cable 30 is configured. In this case, the Utility line 34 plays the role of the HEAC + line, and the HPD line 35 plays the role of the HEAC- line.

  The configuration of the video transmission device 10 shown in FIG. 1 will be described. The video transmission device 10 includes a data transmission unit 11, a CEC processing unit 12, a HEAC processing unit 13, an HPD 14, an error detection unit 15, and a display information holding unit 16. The data transmitting unit 11 generates TMDS data obtained by encoding video data, audio data, control data, and the like based on the EDID received from the video receiving device 20, and transmits the TMDS data to the video receiving device 20. When receiving the error detection signal from the error detection unit 15, the data transmission unit 11 stops transmitting the TMDS data. Then, when the information of the video format is notified from the error detection unit 15, the data transmission unit 11 converts the video data into TMDS data according to the notified video format and transmits the TMDS data to the video reception device 20.

  The CEC processing unit 12 transmits and receives a CEC command to and from the video receiving device 20 via the CEC line 33. The HPD 14 determines whether the HPD signal transmitted from the video receiving device 20 via the HPD line 35 is on or off to determine whether the video receiving device 20 can receive TMDS data. Detect whether or not. The HEAC processing unit 13 transmits and receives data to and from the video receiving device 20 using the Utility line 34 and the HPD line 35.

  The error detection unit 15 monitors information indicating the connection state of the video receiving device 20 and detects occurrence of an error in the video receiving device 20. Specifically, the error detection unit 15 monitors the CEC command and the HPD signal, and detects a defect in transmission of TMDS data to the video reception device 20, reproduction of a video, and the like. When detecting the occurrence of an error in the video receiving device 20, the error detection unit 15 notifies the data transmission unit 11 of the occurrence of the error. Then, the error detection unit 15 reads, from the EDID, a video format having a lower priority than the video format of the video data currently transmitted by the data transmission unit 11 to the video reception device 20 and notifies the data transmission unit 11 of the read video format. When no error occurs in the video receiving device 20, the error detecting unit 15 writes the identification information of the video receiving device 20 and the video format notified to the data transmitting unit 11 in the display information holding unit 16.

  In addition, the error detection unit 15 refers to the information stored in the display information holding unit 16 when the video transmission device 10 is activated, and determines whether the connected video reception device 20 has been connected in the past. . If the connected video receiving device 20 has been connected in the past, the error detecting unit 15 does not perform the error detecting operation of the video receiving device 20. In this case, the error detection unit 15 reads the video format stored by the display information holding unit 16 in association with the identification information of the video reception device 20 and notifies the data transmission unit 11 of the read video format.

  FIG. 2 is a block diagram illustrating a configuration example of the error detection unit illustrated in FIG. The error detection unit 15 includes a control unit 51, a storage unit 52, a timer unit 53, a counter unit 54, a DDC command recognition unit 55, a CEC command recognition unit 56, and an HPD signal detection unit 57. The timer unit 53 has a CEC timer 131 and an HPD timer 132. The counter unit 54 has a CEC counter 141 and an HPD counter 142.

  The DDC command recognition unit 55 monitors communication in the DDC 32. The DDC command recognition unit 55 extracts the EDID from the data received from the video receiving device 20 via the DDC 32 and passes the EDID to the control unit 51. The DDC command recognition unit 55 functions as an acquisition unit that acquires a slave address as identification information of the video reception device 20 from a transmission source header attached to EDID. The DDC command recognition unit 55 notifies the control unit 51 of the identification information of the video receiving device 20.

  The CEC command recognition unit 56 monitors communication on the CEC line 33. The CEC command recognition unit 56 notifies the CEC counter 141 when detecting a specific command. The HPD signal detection unit 57 monitors communication on the HPD line 35. The HPD signal detection unit 57 notifies the HPD counter 142 when detecting the ON of the HPD signal transmitted via the HPD line 35.

  In the CEC timer 131, a timer expiration time Tcmax is set from the control unit 51. When the timer start signal is turned on, the CEC timer 131 starts the timer value from zero. When the timer value reaches the timer expiration time Tcmax, the CEC timer 131 notifies the CEC counter 141 of the timer expiration and clears the timer value to zero.

  In the HPD timer 132, the timer expiration time Tpmax is set by the control unit 51. When the timer start signal is turned on, the HPD timer 132 starts the timer value from zero. When the timer value reaches the timer expiration time Tpmax, the HPD timer 132 notifies the HPD counter 142 of the timer expiration and clears the timer value to zero.

  The CEC counter 141 is set with a count expiration value Vcmax from the control unit 51. The CEC counter 141 counts the number of detections of the CEC command recognition unit 56. When the count number matches the count end value Vcmax, the CEC counter 141 notifies the control unit 51 of the count end. When the CEC counter 141 receives the notification of the expiration of the timer from the CEC timer 131, the CEC counter 141 clears the count to zero.

  The HPD counter 142 is set with a count expiration value Vpmax from the control unit 51. The HPD counter 142 counts the number of detections by the HPD signal detection unit 57. When the count number matches the count expiration value Vpmax, the HPD counter 142 notifies the control unit 51 of the count expiration. Upon receiving the notification of the expiration of the count from the HPD timer 132, the HPD counter 142 clears the count to zero.

  The storage unit 52 stores a program executed by the control unit 51 and various data. Various data stored in the storage unit 52 include timer expiration times Tcmax and Tpmax set in the timer unit 53 and count expiration values Vcmax and Vpmax set in the counter unit 54. The storage unit 52 stores the EDID acquired from the EDID memory 25. The storage unit 52 corresponds to a first storage unit.

  The control unit 51 performs setting of each unit of the timer unit 53 and the counter unit 54, notification of error detection, and control of the storage unit 52. The control unit 51 is, for example, a CPU (Central Processing Unit). Specifically, the control unit 51 reads the timer expiration time Tcmax from the storage unit 52 and sets the timer expiration time Tpmax in the CEC timer 131, and reads the timer expiration time Tpmax from the storage unit 52 and sets it in the HPD timer 132. The control unit 51 reads the count expiration value Vcmax from the storage unit 52 and sets it in the CEC counter 141, and reads the count expiration value Vpmax from the storage unit 52 and sets it in the HPD counter 142. The control unit 51 specifies the command recognized by the CEC command recognition unit 56.

  When the count value of the HPD counter 142 becomes “1”, the control unit 51 recognizes that the video receiving device has been connected. When receiving the notification of the completion of the count from the counter unit 54, the control unit 51 transmits an error detection signal to the data transmission unit 11 to notify the video receiving device 20 that an error has occurred. For example, if the video receiving device 20 cannot normally reproduce the video data due to a problem on the communication path, the user tends to repeatedly plug and unplug the HDMI cable 30 in a short time. Each time the HDMI cable 30 is connected or disconnected, the HPD signal detection unit 57 notifies the HPD counter 142 that the HPD signal has been turned on. In this case, the count value of the HPD counter 142 matches the count expiration value Vpmax before the HPD timer 132 reaches the timer expiration time Tpmax. As a result, the control unit 51 receives a notification from the HPD counter 142 that the count has expired.

  Further, if the video receiving device 20 cannot normally reproduce the video data due to a problem on the communication path, the user may repeatedly switch the input signal port in the video receiving device 20 in a short time. In this case, a <Request Active Source> command is continuously transmitted from the video receiving device 20 to the video transmitting device 10 via the CEC line 33. Each time the <Request Active Source> command is detected, the CEC command recognition unit 56 notifies the CEC counter 141 that a specific command has been detected. Before the CEC timer 131 reaches the timer expiration time Tcmax, the count value of the CEC counter 141 matches the count expiration value Vcmax. As a result, the control unit 51 receives a notification from the CEC counter 141 that the count has expired.

  The control unit 51 stores the EDID received from the DDC command recognition unit 55 in the storage unit 52. The control unit 51 acquires the video format used by the data transmission unit 11 from the DDC command recognition unit 55 and writes the video format into the storage unit 52.

  The control unit 51 causes the display information holding unit 16 to store the video format in which no error occurs in the video receiving device 20 and the identification information of the video receiving device 20 in association with each other. The control unit 51 refers to the information stored in the storage unit 52 when the video transmission device 10 starts. Further, the control unit 51 refers to the information stored in the display information holding unit 16 when the video transmission device 10 is activated, and determines whether or not the connected video reception device 20 has been connected in the past. Functions as a unit. When the connected video receiving device 20 has been connected in the past, the control unit 51 reads out the video format associated with the identification information of the video receiving device 20 and notifies the data transmitting unit 11 of the read video format.

  When notified of the identification information of the video receiving device 20 and the information of the video format from the error detecting unit 15, the display information holding unit 16 stores the identification information of the video receiving device 20 and the video format in association with each other. Information including the identification information and the video format stored by the display information holding unit 16 for each video receiving device is referred to as priority display information. The display information holding unit 16 is, for example, a nonvolatile memory such as a flash memory, and can hold information without power supply. The display information holding unit 16 corresponds to a second storage unit.

  FIG. 3 is a diagram illustrating an example of information held by a display information holding unit illustrated in FIG. As shown in FIG. 3, the display information holding unit 16 stores the identification information of the video receiving device and the video format in association with each other as priority display information for each video receiving device. In FIG. 3, n is an arbitrary integer of 1 or more. FIG. 3 shows that, for example, when the video receiving device with the identification information Sinkid1 was last connected to the video transmitting device 10, the video data normally received the TMDS data generated according to the video format α1. . That is, it means that the video receiving device of the identification information Sinkid1 can receive and reproduce the video data without any error if it is the video data of the video format α1. From this, it can be seen that it is desirable for the video receiving apparatus of the identification information Sinkid1 to preferentially use the video format α1 in order to suppress the occurrence of the error.

  Next, the configuration of the video receiving device 20 shown in FIG. 1 will be described. The video receiving device 20 includes a data receiving unit 21, a CEC processing unit 22, a HEAC processing unit 23, a signal output unit 24, and an EDID memory 25. When receiving the TMDS data from the video transmitting device 10, the data receiving unit 21 converts the TMDS data into video data, audio data, control data, and the like.

  The CEC processing unit 22 transmits and receives a CEC command to and from the CEC processing unit 12 via the CEC line 33. The signal output unit 24 keeps the HPD signal in the off state when not connected to the video transmission device 10, and switches the HPD signal from the off state to the on state when connected to the video transmission device 10. The HEAC processing unit 23 transmits and receives data to and from the HEAC processing unit 13 using the Utility line 34 and the HPD line 35.

  The EDID memory 25 stores a list of information about a display such as a video format set in advance according to the capability of the video receiving device 20. The list of information regarding the display is, for example, EDID. FIG. 4 is a diagram illustrating an example of the EDID stored in the EDID memory illustrated in FIG.

  The EDID shown in FIG. 4 is composed of block 0 and block 1, and shows a case where the amount of information to be held is 256 bytes. However, the EDID may be extended every 128 bytes or may be composed only of block 0. . The EDID includes, as display information of the video receiving device 20, information on a video format that can be reproduced by the video receiving device 20, information on color characteristics, and the like. For example, in the “video format specification” area of block 0, for example, a video format of “640 dots × 480 lines” and a frame rate of “60 Hz” is set.

  When there are a plurality of reproducible video formats, the display information may include information on the video format and the priority indicating the priority of the video format. That is, when the video receiving device 20 can support a plurality of video formats, a plurality of selectable display information is set in the “video format specification” area. In the video format, the higher the resolution or the transmission frequency, the greater the processing load of transmission. In the first embodiment, it is assumed that the priority of the video format is set higher in the EDID as the resolution or the transmission frequency increases. In the EDID block 1 shown in FIG. 4, information such as a video format standardized by a CEA (Consumer Electronics Association) 861 is mainly set.

  In the configuration illustrated in FIG. 2, the storage unit 52 is provided in the error detection unit 15, but may not be provided in the error detection unit 15 as long as the storage unit 52 is in the video transmission device 10. Some of the plurality of functions included in the error detection unit 15 need not be provided in the error detection unit 15 as long as the functions are provided in the video transmission device 10. For example, the function of the acquisition unit for acquiring identification information from the video receiving device 20 in the DDC command recognition unit 55 does not have to be provided in the error detection unit 15. The function of a determination unit in the control unit 51 that determines whether or not the video receiving device 20 has been connected in the past with reference to the information stored in the display information holding unit 16 is provided in the error detection unit 15. You do not have to.

  Next, the operation of the video transmission device 10 shown in FIG. 1 will be described. FIG. 5 is a flowchart showing an operation procedure of the information processing method executed by the video transmitting apparatus shown in FIG. Here, the description of the information processing regarding the authentication between the devices is omitted.

  The HPD signal detection unit 57 determines whether the HPD signal is turned on (Step S101). When the HPD signal is turned on, the HPD counter 142 sets the count value to “1”. When the count value of the HPD counter 142 becomes “1”, the control unit 51 recognizes that the video receiver 20 has been connected to the video transmitter 10. The DDC command recognition unit 55 reads the EDID from the EDID memory 25 and passes it to the control unit 51. The control unit 51 stores the EDID received from the DDC command recognition unit 55 in the storage unit 52 (Step S102). Further, the control unit 51 acquires information on the video format used by the data transmission unit 11 from the DDC command recognition unit 55, and specifies the video format used (step S103).

  The error detection unit 15 monitors the CEC command and the HPD signal, and performs an error detection operation on the video receiving device 20 (step S104). When an error occurs in the video reception device 20, the control unit 51 transmits an error detection signal to the data transmission unit 11. Subsequently, the control unit 51 refers to the EDID stored in the storage unit 52 and reads a video format having a lower priority than the video format currently used by the data transmission unit 11. Then, the control unit 51 notifies the data transmission unit 11 of the read video format (Step S105). The data transmission unit 11 converts the video data into TMDS data using the video format notified from the error detection unit 15 and transmits the TMDS data to the video reception device 20.

  When no error occurs in the video receiving device 20 as a result of the error detection in step S104, the control unit 51 associates the video format used by the data transmitting unit 11 with the identification information of the video receiving device 20 to display information. It is stored in the holding unit 16 (step S106). The display information holding unit 16 stores priority display information in which the identification information of the video receiving device 20 is associated with the video format.

  According to the procedure shown in FIG. 5, even if an error occurs in the video receiving device 20 due to a problem on the TMDS data communication path, the video format is automatically changed to a video format with a low processing load. Even if the user is not familiar with the video transmission device 10 and the video reception device 20, there is no need to perform operations such as changing the settings of the device, and the video reception device 20 can normally reproduce the video data.

  Next, the operation of the video transmitting apparatus 10 when the display information holding unit 16 shown in FIG. 1 stores the priority display information will be described. Here, the description of the information processing regarding the authentication between the devices is omitted. FIG. 6 is a flowchart showing an operation procedure of another information processing method executed by the video transmitting apparatus shown in FIG.

  The HPD signal detection unit 57 determines whether the HPD signal is turned on (Step S201). Since the processing in step S201 is the same as that in step S101 shown in FIG. 5, a detailed description thereof will be omitted. When the control unit 51 recognizes that the video transmission device 10 has been connected to the video reception device 20, the DDC command recognition unit 55 receives the identification information acquired from the video reception device 20 from the DDC command recognition unit 55 (step S202). . Subsequently, the control unit 51 compares the acquired identification information with the information stored in the display information holding unit 16, and determines whether or not the acquired identification information is recorded in the display information holding unit 16 (Step S203). . When the acquired identification information is not recorded in the display information holding unit 16, the control unit 51 proceeds to the process of step S102 shown in FIG.

  On the other hand, when the obtained identification information is recorded in the display information holding unit 16 as a result of the determination in step S203, the control unit 51 indicates that the video receiving device 20 has been connected to the video transmitting device 10 in the past. Is determined. Then, the control unit 51 reads the video format stored in association with the acquired identification information from the information stored in the display information holding unit 16, and notifies the data transmission unit 11 of the read video format (Step S204). ). The data transmission unit 11 converts the video data into TMDS data using the video format notified from the error detection unit 15 and transmits the TMDS data to the video reception device 20.

  According to the procedure shown in FIG. 6, the error detection unit 15 can omit the error detection operation in step S104 shown in FIG. Further, since the video transmitting apparatus 10 can omit the process of specifying the video format that the video receiving apparatus 20 can support from the EDID, the video transmitting apparatus 10 can quickly transition to a state of transmitting video data. Furthermore, since the video format which does not cause an error in the video receiving device 20 and which has the highest priority is used, the video receiving device 20 suppresses the occurrence of the error while starting to output a video having a higher resolution. Can be played from.

  Next, the operation of the video reproduction system according to the first embodiment will be described. FIG. 7 is a sequence diagram showing an operation procedure of the video reproduction system shown in FIG. Here, a case will be described in which the video receiving device 20 is connected to the video transmitting device 10 in the past.

  The user connects the video transmitting device 10 and the video receiving device 20 with the HDMI cable 30 and turns on the power of the video transmitting device 10 and the video receiving device 20. When the video transmitting device 10 and the video receiving device 20 are activated (step S301), the HPD signal is turned on, and the HPD 14 detects that the video receiving device 20 is connected (step S302). The control unit 51 of the error detection unit 15 recognizes the connection of the video reception device 20 when the count value of the HPD counter 142 becomes “1” (Step S303). Subsequently, the video transmitting apparatus 10 performs HDMI authentication for authenticating the video receiving apparatus 20 via the DDC 32 (step S304). When the control unit 51 recognizes that the HDMI authentication is completed via the DDC command recognition unit 55 (step S305), the control unit 51 determines that the TMDS data can be transmitted to the video receiving device 20.

  After step S305, the control unit 51 refers to the information stored in the display information holding unit 16 and acquires the priority display information of the video receiving device 20. The control unit 51 reads out the video format from the acquired priority display information (Step S306). Then, the control unit 51 notifies the data transmitting unit 11 of the read video format to the video receiving device 20 as the last used video format at the time of the previous connection (Step S307). The data transmission unit 11 converts the video data into TMDS data according to the video format notified from the error detection unit 15 and transmits the TMDS data to the video reception device 20 (Step S308).

  The video transmission device 10 according to the first embodiment includes a data transmission unit 11, an error detection unit 15 that detects an error of the video reception device 20, a storage unit 52 that is a first storage unit, and a second storage unit. And a display information holding unit 16. The data transmitting unit 11 transmits the video data to the video receiving device 20 in which the error has been detected, in a format having a smaller processing load than the format in which the error has occurred among the plurality of formats stored in the storage unit 52. The display information holding unit 16 stores the identification information of the video receiving device in which the error is detected and the video format transmitted to the video receiving device in association with each other.

  According to the first embodiment, even if an error occurs in the video receiving device 20 due to a problem on the TMDS data communication path, the video format used for the video data is sequentially changed to a video format with a low processing load. Be changed. Therefore, even if the user is not familiar with the video transmission device 10 and the video reception device 20, there is no need to perform an operation such as a change in device settings, and the video reception device 20 can normally reproduce video data. it can.

  Further, in the first embodiment, when the video receiving device 20 has been connected to the video transmitting device 10 in the past, the error detecting unit 15 may not perform the error detecting operation. Further, the data transmitting unit 11 may transmit the video data to the video receiving device 20 using the video format stored by the display information holding unit 16 in association with the identification information of the video receiving device 20. In this case, the video transmitting device 10 does not need to read information of a video format that the video receiving device 20 can support from the EDID at the time of startup, and does not require an error detection operation. As a result, it is possible not only to quickly transition to a state of transmitting video data, but also to automatically suppress the occurrence of errors.

  In the first embodiment, a case has been described in which the number of the video receivers 20 connected to the video transmitter 10 is one, but a plurality of the video receivers 20 may be provided. Further, the case where the slave address is used as the identification information of the video receiving device 20 has been described, but the identification information is not limited to the address for specifying the communication partner. For example, device manufacturing information held by the EDID may be used as identification information of the video receiving device. This is because video formats compatible with reproduction are common between video receiving devices of the same model. In this case, the amount of information stored in the display information holding unit 16 can be suppressed.

  In the first embodiment, the error detection unit 15 of the video transmission device 10 monitors one of the CEC command and the HPD signal in step S104 of the flowchart illustrated in FIG. May be performed. In this case, in step S104, the error detection unit 15 validates the operation of one of the pair of the CEC counter 141 and the CEC timer 131 or the pair of the HPD counter 142 and the HPD timer 132, and activates the operation of the other pair. May be invalidated.

  In the first embodiment, the CEC command to be recognized by the CEC command recognition unit 56 may be a command other than the <Request Active Source> command described above. For example, as a user operation when the received video data cannot be correctly reproduced due to a problem on the communication path, there is a case where the power of the video receiving device 20 is repeatedly turned on and off. In this case, the <standby> command is continuously transmitted from the video receiving device 20 via the CEC line 33. Therefore, the control unit 51 of the error detection unit 15 may detect the occurrence of an error by counting the number of times the <standby> command is detected within a set time. In addition, a command such as <Routing Change> or <Routing Information> may be set as a target command.

  Further, in the first embodiment, the CEC commands to be recognized by the CEC command recognition unit 56 are commands for notifying the video transmission device 10 that an error has occurred in the video reception device 20 in addition to the above-described commands. You may. In this case, an error notification command is transmitted from the video receiving device 20 via the CEC line 33. Therefore, the control unit 51 of the error detection unit 15 may detect the occurrence of an error in the video receiving device 20 by detecting the error notification command one or more times.

  Further, the video transmission device 10 of the first embodiment may be various devices such as a recording / reproducing device such as a DVD recorder or a player, a digital camera, a PC (Personal Computer), a tablet terminal, a game device, and a smartphone. Good.

  Further, a program that records the procedure of the information processing method according to the first embodiment may be installed in a computer, and the computer may execute the information processing method according to the first embodiment. Further, in the first embodiment, the case has been described where TMDS data is used as the data format of the video data and an HDMI cable is used as the data transmission means. However, the data format is not limited to the TMDS data, and the data transmission means uses the HDMI cable. Not limited to cables.

Reference Signs List 10 video transmission device 11 data transmission unit 12 CEC processing unit 13 HEAC processing unit 14 HPD
Reference Signs List 15 error detecting unit 16 display information holding unit 20 video receiving device 21 data receiving unit 22 CEC processing unit 23 HEAC processing unit 24 signal output unit 25 EDID memory 30 HDMI cable 31 TMDS channel 32 DDC
33 CEC line 34 Utility line 35 HPD line 51 Control unit 52 Storage unit 53 Timer unit 54 Counter unit 55 DDC command recognition unit 56 CEC command recognition unit 57 HPD signal detection unit 131 CEC timer 132 HPD timer 141 CEC counter 142 HPD counter

Claims (5)

A transmitting unit that transmits video data to the video receiving device;
An error detection unit that detects the occurrence of an error in the video receiving device based on information indicating a connection state of the video receiving device, which is transmitted from the video receiving device,
A first storage unit that stores a plurality of formats in the video data to be transmitted to the video receiving device,
Identification information of the video receiving device where the occurrence of the error is detected, and a second storage unit that stores the format of the video data transmitted to the video receiving device in association with each other,
Has,
The transmitting unit, for a video receiving device in which the error is detected, of the plurality of formats stored in the first storage unit, the video data in a format having a smaller processing load than the format in which the error occurred, Send,
The second storage unit stores the identification information of the video receiving device in which the error is detected and the format of the processing load transmitted to the video receiving device in association with each other,
Video transmission device. When connected to the video receiving device, an obtaining unit that obtains identification information from the video receiving device,
A determination unit that compares the identification information of the video receiving device obtained by the obtaining unit and the information stored in the second storage unit, and determines whether the video receiving device has been connected in the past. ,
Further having
The error detection unit, as a result of the determination of the determination unit, if the video receiving device is connected in the past, without performing the error detection operation,
The transmitting unit, the second storage unit stores, transmits the video data in a format associated with the identification information of the video receiving device to the video receiving device,
The video transmission device according to claim 1. The transmitting unit transmits the video data to the video receiving device via an HDMI (High-Definition Multimedia Interface) cable,
3. The error detection unit according to claim 1, wherein the error detection unit detects the occurrence of the error based on an HPD (Hot plug detector) signal or a CEC (Consumer Electronics Control) command as information indicating a connection state of the video receiving device. 4. The video transmission device as described in the above. An information processing method by a video transmitting device that transmits video data to a video receiving device,
Store a plurality of formats in the video data to be transmitted to the video receiving device,
Based on the information transmitted from the video receiving device and indicating the connection state of the video receiving device, detecting the occurrence of an error in the video receiving device,
For the video receiving device in which the occurrence of the error is detected, of the plurality of formats, the video data is transmitted in a format having a smaller processing load than the format in which the error has occurred,
The identification information of the video receiving device in which the error is detected and the format transmitted with the processing load transmitted to the video receiving device are stored in association with each other,
Information processing method. To a computer that transmits video data to the video receiving device,
Means for storing a plurality of formats in the video data to be transmitted to the video receiving device,
Means for detecting the occurrence of an error in the video receiving device, based on information indicating the connection state of the video receiving device, transmitted from the video receiving device,
Means for transmitting the video data in a format having a smaller processing load than the format in which the error has occurred, among the plurality of formats,
A program for functioning as a means for storing identification information of a video receiving device in which the error is detected and a format with a small processing load transmitted to the video receiving device in association with each other.

Images