JP4725113B2 - Video signal output device - Google Patents

Description

  The present invention relates to a video signal output apparatus capable of switching and outputting a plurality of video formats.

  In recent years, the demand for DVDs has greatly increased, and accordingly, the demand for video signal output devices such as DVD players and DVD recorders has also increased rapidly. There are also a wide variety of video display devices and AV amplifier devices connected to video output devices such as DVD players. Conventionally, video output devices output video as analog signals. In recent years, analog signals have deteriorated video, and there is a growing demand for viewing digital images without deterioration, and development of video signal output devices capable of digital transmission is progressing. In particular, many devices that perform digital transmission in conformity with the IEEE 1394 standard have been developed, and when devices are connected by IEEE 1394, the devices can recognize each other.

  If the device is connected to the IEEE 1394 network, by analyzing the keyword character string held in the keyword leaf of the Configuration ROM, what type of device is the device (printer, personal computer, digital camera) Etc.) can be determined. Further, by analyzing the character string written in the feature directory, it is possible to obtain information on what kind of device is the display device. For this reason, for example, the printer can specify the type of the partner device that has instructed printing, and can know what display device displays the image based on the image displayed on the display device. Therefore, it is possible to perform printing more desired by the user according to the partner apparatus.

As described above, in a device conforming to the IEEE 1394 standard, it is possible to specify a device to be connected and change processing by using information in the configuration ROM. (For example, refer to Patent Document 1.)
On the other hand, devices that perform digital transmission in conformity with the HIGH DEFINITION MULTITIMEDIA INTERFACE (hereinafter abbreviated as HDMI) standard have also been developed. There was no change.

The operation of the digital transmission device compliant with the HDMI standard will be described with reference to FIGS. 3, 4, and 5. FIG. FIG. 3 is a block diagram of a video signal output device compliant with the HDMI standard, FIG. 4 is an explanatory diagram showing the HDMI authentication operation of the device, and FIG. 5 is an explanation showing the HDMI authentication operation when the device fails authentication. FIG. As shown in FIG. 3, the video signal output device 31 receives a hot plug signal used for the purpose of confirming the HDMI connection. The input hot plug signal is converted into 1/0 information by the hot plug determining means 9 and input to the HDMI data processing means 32. EXTENDED DISPLAY IDENTIFICATION DATA (hereinafter abbreviated as EDID) data is also input to the HDMI data processing means 12. Here, the EDID data includes information related to video that can be displayed or input by the video display device, information related to audio that can be input, maker information, product information, and the like. This data is based on the (EDID) standard and is stored in a data format defined by the EIA / CEA-861B standard.
As shown in FIG. 4, when the hot plug signal becomes High, authentication is started and an HDMI signal is output. Next, a description will be given of a case where authentication fails because no means for specifying a device to be connected is provided. As shown in FIG. 5, there is a specific video display device that starts authentication when the hot plug signal becomes High, but detects interruption of the HDMI output signal due to format switching and makes the hot plug signal Low. When such a video display apparatus is HDMI-connected, authentication fails because the authentication is interrupted when the hot plug signal becomes Low during the authentication operation.
Japanese Patent Application Laid-Open No. 2001-257685

  The problem to be solved is that HDMI authentication fails when connecting with multiple video display devices or AV amplifier devices with normal software running when HDMI connection is established, and the video is output correctly It may not be possible.

  The video signal output device of the present invention reads EDID information from the connected device when the connected video display device or AV amplifier device is turned on, detects product information / manufacturer information / video format information, and stores it in the memory. Compared with the stored information, if the information matches, the activation content of the software is changed.

  For example, when a video display device or AV amplifier device to be connected is identified based on EDID information and connected to a specific video display device or AV amplifier device, even if the hot plug signal is set to Low during the authentication operation. The hot plug detection is not performed for 3 seconds when the video signal output apparatus performs the authentication operation.

  The video signal output device of the present invention can detect a device that fails HDMI authentication when starting normal software, and can change the startup content of the software to make HDMI authentication successful.

  For example, when it is detected that the hot plug signal is low, HDMI re-authentication is performed. Therefore, in the previous video signal output apparatus, if the hot plug becomes low during authentication due to a mismatch in the processing sequence, the hot plug “ HDMI authentication may fail due to the repetition (output NG) of “High” → authentication operation → “Low” → “High” → re-authentication operation (from the beginning of authentication) → “Low”. However, according to the present invention, the operation of hot plug “High” ⇒ authentication operation ⇒ “Low” (ignore) ⇒ “High” ⇒ authentication operation (continued) ⇒ authentication completion (output OK) establishes HDMI authentication and video Is output normally.

(Embodiment 1)
FIG. 1 is a block diagram of a video signal output apparatus for carrying out the present invention. In FIG. 1, 1 represents the entire video signal output apparatus, and 2 represents input from a connected video display apparatus or AV amplifier apparatus. EDID product information detecting means for detecting EDID product information from the EDID input data, 3 for EDID manufacturer information detecting means for detecting EDID manufacturer information, 4 for EDID video format information detecting means for detecting EDID video format information, 5 Memory having product information, manufacturer information and video format information, 6 is a memory input / output means for outputting information read from the memory, 7 is EDID product information from the video display device and AV amplifier device, EDID manufacturer information, and EDID video Comparing means for comparing format information and memory output information, 8 Program switching means for switching a program in accordance with the comparison result of the compare means 12 is a HDMI data processing means.

The operation of the video signal output apparatus configured as described above will be described below.
The hot plug information is normally switched at the timing of “High” → “Low” → “High” → authentication operation. When the state of “Low” → “High” is recognized, the authentication operation is started.

  When a specific video signal output device and a video display device or an AV amplifier device are HDMI-connected, there are combinations in which the communication timing does not match and HDMI authentication fails. For this reason, the video signal output device detects a specific video display device in which authentication fails and switches from a normal program to a special program that changes the communication timing so that the authentication is successful. EDID product information is ID information assigned to each product, EDID manufacturer information is ID information assigned to each manufacturer, and EDID video format information is video format information that can be displayed by the video display device, and is described in the EDID data. The combination of these information enables detection of a specific video display device. The video signal output device stores in advance various information described in the video display device that fails authentication, and detects the device when the stored information matches the information of the EDID data input from the connected device To do.

  In the present invention, EDID information is read from a connected receiver, and EDID product information detection means 2, EDID manufacturer information detection means 3, and EDID video format information detection means 4 detect EDID information of the currently connected device. . Each detected EDID information is compared with product information, maker information, and video format information read from the memory 5 by the memory input / output means 6 by the memory input / output means 6 by the comparison means 7, and the program switching means determines whether or not they match. Tell 8 The program switching means 8 switches the program according to the comparison result of the comparison means 9 depending on the case of matching or not.

  Next, a configuration example of the program switching means 8 will be described. The hot plug determining means 9 converts the input hot plug signal into 1/0 information. According to the comparison result of the comparison means 7, the hot plug information creation means 11 outputs 1 only to the time set by the time setting means 10 to the HDMI data processing means 12 when the information compared by the comparison means 7 matches, and does not match. At this time, the information obtained from the hot plug discrimination means 9 is output.

  FIG. 2 is an explanatory diagram showing the HDMI authentication operation of the video signal output apparatus of the present invention that avoids authentication failure. The hot plug information creation means 11 outputs 1 as hot plug information data for 3 seconds set by the time setting means 10 from the start of authentication when the information compared by the comparison means 7 matches according to the comparison result of the comparison means 7. To do. Therefore, even if the input hot plug signal falls to Low, it is not recognized. After 3 seconds, the information obtained from the hot plug determining means 9 is output as hot plug information data. Also, when it is detected by this algorithm that another video display device is connected, the information obtained from the hot plug determining means 9 is output as hot plug information data.

  Note that it is not necessary to use all three of EDID product information, EDID manufacturer information, and EDID video format information for detection of a specific video display device. At least one or more may be used. Further, all the means constituting the program switching means do not need to be constituted by hardware. It may consist of software.

  The video signal output apparatus according to the present invention can smoothly perform an authentication operation using EDID data obtained from a connected video display apparatus, AV amplifier apparatus, or the like. It is possible to prevent authentication failure on a specific model.

The figure which showed the structure of the video signal output device in embodiment of this invention Explanatory drawing which showed the operation | movement of HDMI authentication of the video signal output device in embodiment of this invention The figure which showed the structure of the video signal output device based on HDMI specification Explanatory drawing which showed the operation | movement of the HDMI certification | authentication of the video signal output device based on HDMI specification Explanatory drawing which showed the operation | movement of HDMI authentication when the video signal output device based on HDMI specification fails in authentication

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Video signal output device 2 EDID product information detection means 3 EDID maker information detection means 4 EDID video format information detection means 5 Memory 6 Memory input / output means 7 Comparison means 8 Program switching means 9 Hot plug discrimination means 10 Time setting means 11 Hot plug Information creation means 12 HDMI data processing means

Claims (4)

  A video signal output device connected to an external device,
  Detecting means for detecting predetermined information from the external device;
  Storage means for storing predetermined information in advance;
  A comparison means for comparing the detected information and the stored information;
  Obtaining means for obtaining hot plug information indicating High or Low from the external device;
  Conversion means for converting the hot plug information into a setting signal according to the comparison result;
  When the setting signal is Low, the connection authentication with the external device is disconnected. When the setting signal changes from Low to High, connection authentication is started for the external device, and the setting signal continues. Authentication means for continuing connection authentication with the external device;
With
The converting means includes
  When the comparison result indicates coincidence, hot plug information indicating Low is converted into a High setting signal.
Video signal output device.   The predetermined information includes at least one of manufacturer information, product information, or format information.
The video signal output device according to claim 1.   Detection means for detecting predetermined information from data input from a connected device, memory input / output means for reading and outputting predetermined information from a memory, information obtained from the detection means, and memory input / output means Comparing means for determining whether or not the obtained information matches, program switching means for switching programs according to the matching information inputted from the comparing means, and the connection by the information inputted from the program switching means Data processing means for authenticating the device to be
  When the program switching means is matched according to the matching information inputted from the comparing means and the judging means for converting the hot plug signal indicating High or Low input from the connected device into information indicating 1 or 0 Has information generating means for outputting 1 instead of 0 inputted from the discrimination means,
  When the information input from the information creation unit is 0, the data processing unit disconnects the connection authentication with the connected device, and the information input from the information creation unit is changed from 0 to 1. If the information input from the information creating means is 1, the connection authentication with the connected device is continued.
Video signal output device. The predetermined information includes at least one of product information, manufacturer information, or format information.
The video signal output device according to claim 3.

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