JP2014017850A5

JP2014017850A5 -

Info

Publication number: JP2014017850A5
Application number: JP2013186873A
Authority: JP
Filing date: 2013-09-10
Publication date: 2014-07-17
Anticipated expiration: 2027-12-07

Description

機器間のデジタル映像インタフェースとして、非特許文献２記載のＨＤＭＩ（High-Definition multimedia Interface）がある。このＨＤＭＩにおいて、ＨＤＭＩケーブル内の線を使って機器間の通信仕様として、ＣＥＣ（Consumer Electronics Control）が決められている。ＣＥＣ仕様の中で、接続機器の制御情報や機器情報を伝えるＣＥＣメッセージを利用して、機器間の制御を行う例が特許文献２に記載されている。 As a digital video interface between equipment, there is a non-patent literature 2 described HDMI (High-Definition multimedia Interface) . In this HDMI, CEC (Consumer Electronics Control) is determined as a communication specification between devices using a line in an HDMI cable. In the CEC specification, Patent Document 2 describes an example in which control between devices is performed using a control information of connected devices and a CEC message that conveys device information.

図１は、本発明に係る映像表示システム１の構成を示すブロック図である。図１におい
て、映像伝送装置１５は、無線送信ユニット１２と無線受信ユニット１３から構成され、映像信号源１１が出力する映像信号を、映像表示装置１４へ伝送する。 FIG. 1 is a block diagram showing a configuration of a video display system 1 according to the present invention. In FIG. 1, the video transmission device 15 includes a wireless transmission unit 12 and a wireless reception unit 13, and transmits a video signal output from the video signal source 11 to the video display device 14.

まず、映像信号の流れを説明する。映像信号源１１は、映像音声信号生成部１１６で生成された映像信号に映像信号処理部１１５で所定のスケーリング処理や画質向上信号処理を施した後、ＴＭＤＳ送信部１１４から無線送信ユニット１２のＴＭＤＳ受信部１２４へ線路１０３を経由して伝送される。ＴＭＤＳ受信部１２４の出力は映像圧縮部１２６で符号化されて映像データ量を圧縮した後、無線送信部１２７から無線受信ユニット１３の無線受信部１３６へ電波１０４で伝送される。 First, the flow of the video signal will be described. The video signal source 11 performs predetermined scaling processing and image quality improvement signal processing on the video signal generated by the video / audio signal generation unit 116 by the video signal processing unit 115, and then performs TMDS transmission from the TMDS transmission unit 114 to the TMDS of the wireless transmission unit 12. The signal is transmitted to the receiving unit 124 via the line 103. The output of the TMDS reception unit 124 is encoded by the video compression unit 126 and the amount of video data is compressed, and then transmitted from the wireless transmission unit 127 to the wireless reception unit 136 of the wireless reception unit 13 by the radio wave 104.

ＥＤＩＤ読込部１１３と１３３は、それぞれ、無線送信ユニット１２と映像表示装置１４の仕様を示すデータが保存されているＥＤＩＤ格納部１２３と１４３のデータを、線路１０２と１０６を介して読み出すものである。この仕組みにより、映像信号源１１と無線受信ユニット１３は、それぞれ所定の無線送信部１２と映像表示装置１４が直接接続されていることがわかる。この後、映像信号源１１と無線受信ユニット１３がそれぞれ、線路１０１と１０５を通じ、ＣＥＣメッセージ交換機能１１１と１２１、１３１、１４１を用いて無線送信部１２や映像表示装置１４に、所定の映像信号源１１と無線受信ユニット１３が接続されていることを知らせ、所定の映像信号源１１と映像伝送装置１５、映像表示装置１４が直接接続された、特別なシステム接続構成であることを認識する。この認識が成立すると、映像信号源１１の映像処理部１１５は映像圧縮効率が上がる様な前処理を担当し、映像表示装置１４の映像処理部１４５が映像圧縮に特有な、例えばモスキートノイズなどの抑圧を行い、総合的な高画質を提供することができる。 The EDID reading units 113 and 133 read data of the EDID storage units 123 and 143 storing data indicating the specifications of the wireless transmission unit 12 and the video display device 14 via the lines 102 and 106, respectively. . With this mechanism, it is understood that the video signal source 11 and the wireless reception unit 13 are directly connected to a predetermined wireless transmission unit 12 and a video display device 14, respectively. After that, the video signal source 11 and the wireless reception unit 13 respectively send predetermined video signals to the wireless transmission unit 12 and the video display device 14 using the CEC message exchange functions 111, 121, 131, and 141 through the lines 101 and 105, respectively. It is informed that the source 11 and the wireless receiving unit 13 are connected, and recognizes a special system connection configuration in which a predetermined video signal source 11, the video transmission device 15, and the video display device 14 are directly connected. When this recognition is established, the video processing unit 115 of the video signal source 11 takes charge of pre-processing for increasing the video compression efficiency, and the video processing unit 145 of the video display device 14 is specific to video compression, such as mosquito noise. It can suppress and provide comprehensive high image quality.

図２は、上記実施形態における、映像信号源１１と無線送信ユニット１２、無線受信ユニット１３．映像表示装置１４の間の制御シーケンスを示した図である。図３は左側に無線送信ユニット１２（図３ではＴｘと略表示する）の状態遷移を、右側に無線受信ユニット１３（図３ではＲｘと略表記する）の状態遷移を示した図である。 FIG. 2 shows the video signal source 11, the wireless transmission unit 12, the wireless reception unit 13. It is the figure which showed the control sequence between the video display apparatuses. FIG. 3 is a diagram showing the state transition of the wireless transmission unit 12 (abbreviated as Tx in FIG. 3) on the left side and the state transition of the wireless reception unit 13 (abbreviated as Rx in FIG. 3) on the right side.

以下、図１の実施形態における特別なシステム接続構成の把握動作を、図２の制御シーケンス図と図３の状態遷移図を併用して以下に説明する。 Hereinafter, the grasping operation of the special system connection configuration in the embodiment of FIG. 1 will be described below using the control sequence diagram of FIG. 2 and the state transition diagram of FIG.

無線受信ユニット１３は、電源オン直後は第二のレジスタ１３８をリセットし（図３の３２１）、ＤＤＣ＋５Ｖを映像表示装置１４へ供給する（図２の２２１、図３の３２２）。映像表示装置１４が示すＨＰＤ＝“Ｈ”への変化を検知して、ＥＤＩＤ読込部１３３は映像表示装置１４のＥＤＩＤ格納部１４３からデータを読込み（図２の２２３、図３の３２３）、所定の映像表示装置と判断されると第二のレジスタ１３８をセットする（図３の３２４）。 The wireless reception unit 13 resets the second register 138 immediately after the power is turned on (321 in FIG. 3), and supplies DDC + 5V to the video display device 14 (221 in FIG. 2, 322 in FIG. 3). Upon detecting a change to HPD = “H” indicated by the video display device 14, the EDID reading unit 133 reads data from the EDID storage unit 143 of the video display device 14 (223 in FIG. 2, 323 in FIG. 3), and a predetermined value. If it is determined that the second image display device is selected, the second register 138 is set (324 in FIG. 3).

尚、映像伝送装置１５が電源ＯＮされた時に、映像信号源１１の電源が入っていない場合は、ＤＤＣ＋５Ｖは供給されず、接続形態は不明状態が続く。これを避けるために、電源オフ直前のレジスタ１２８の状態を記憶するよう、不揮発性メモリを使っている。 If the video signal source 11 is not turned on when the video transmission device 15 is turned on, DDC + 5V is not supplied, and the connection state remains unknown. In order to avoid this, a nonvolatile memory is used to store the state of the register 128 immediately before the power is turned off.

以上、述べたように、所定の映像信号源と映像伝送装置、映像表示装置の組合せの場合にのみＣＥＣ命令を転送する映像伝送装置が、余分なＣＥＣメッセージを誤って送信するケースを抑えることができる。 Thus, as mentioned, suppress the case in which a predetermined video signal source, video transmitting apparatus, video transmission device for transferring the CEC command only when the combination of Film image Display apparatus transmits erroneously extra CEC message be able to.

本発明の第三の実施例によるシステムブロック図を図５に示す。図１と同じ構成物には同じ番号を付与しており、１６は音声処理機能付映像伝送装置である。音声処理機能付映像伝送装置１６には、音声処理１６７や、スピーカ１６８等が接続されている。所定の映像信号源と映像伝送装置、映像表示装置の直接接続を検出した上で、あらかじめ決められた操作手順に基づき、直接接続装置間の連係動作を実現するものである。 A system block diagram according to the third embodiment of the present invention is shown in FIG. The same components as those in FIG. 1 are given the same numbers, and 16 is a video transmission device with an audio processing function. An audio processing 167, a speaker 168, and the like are connected to the video transmission device 16 with an audio processing function . A direct connection between a predetermined video signal source, a video transmission device, and a video display device is detected, and a linked operation between the direct connection devices is realized based on a predetermined operation procedure.

Claims

In a video transmission system in which a transmission device, a video signal source, and a video reception device are connected via HDMI (High-Definition Multimedia Interface) that transmits an uncompressed video signal,
An apparatus having the function of checking whether or not the video signal source and the video receiving apparatus have a function of transmitting and receiving a message, and the video signal source and the video receiving apparatus both transmitting and receiving the message. If it is, enabling the function of transmitting and receiving the message between the video signal source and the video receiving device,
When the HPD (Hot Plug Detect) signal indicated by the video receiver is set to the “L” level, the function of transmitting and receiving the message between the video signal source and the video receiver is stopped. Video transmission system.

The video transmission system according to claim 1,
The transmission apparatus confirms that the video signal source has a function of transmitting and receiving the message based on a message transmitted from the video signal source.

The video transmission system according to claim 1 or 2,
The transmission device confirms that the video reception device has a function of transmitting and receiving the message by reading information indicating the function of the video reception device stored in the video reception device. Video transmission system.

A video transmission method for transmitting a video signal in a system to which a transmission device, a video signal source, and a video reception device are connected via HDMI (High-Definition Multimedia Interface) for transmitting an uncompressed video signal,
When the transmission device confirms the functions of the video signal source and the video reception device, and the video signal source and the video reception device have a function of transmitting and receiving messages, a message issued by the video signal source is sent to the video Transmitted to the receiving device, the message sent by the video receiving device is transmitted to the video signal source,
When the HPD (Hot Plug Detect) signal indicated by the video receiver is set to the “L” level, the function of transmitting and receiving the message between the video signal source and the video receiver is stopped. Video transmission method.