KR20120134051A - Wireless multimedia interface apparatus and method - Google Patents

Wireless multimedia interface apparatus and method Download PDF

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Publication number
KR20120134051A
KR20120134051A KR1020120056743A KR20120056743A KR20120134051A KR 20120134051 A KR20120134051 A KR 20120134051A KR 1020120056743 A KR1020120056743 A KR 1020120056743A KR 20120056743 A KR20120056743 A KR 20120056743A KR 20120134051 A KR20120134051 A KR 20120134051A
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KR
South Korea
Prior art keywords
source
wireless
hdmi
data
source device
Prior art date
Application number
KR1020120056743A
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Korean (ko)
Inventor
유재명
최진구
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(주)대우루컴즈
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Priority to KR1020120056743A priority Critical patent/KR20120134051A/en
Publication of KR20120134051A publication Critical patent/KR20120134051A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H04N21/4363—Adapting the video or multiplex stream to a specific local network, e.g. a IEEE 1394 or Bluetooth® network
    • H04N21/43632—Adapting the video or multiplex stream to a specific local network, e.g. a IEEE 1394 or Bluetooth® network involving a wired protocol, e.g. IEEE 1394
    • H04N21/43635—HDMI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H04N21/4363—Adapting the video or multiplex stream to a specific local network, e.g. a IEEE 1394 or Bluetooth® network
    • H04N21/43637—Adapting the video or multiplex stream to a specific local network, e.g. a IEEE 1394 or Bluetooth® network involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11]

Abstract

The present invention relates to a wireless multimedia interface device and a method, and the wireless multimedia interface device according to the present invention selects any one of the one or more source devices and wirelessly receives video and audio data transmitted from the selected source device. After converting the signal to a sink device, the sink device receives the transmitted radio signal through a wireless receiver connected to the sink device and outputs video and audio data.

Description

Wireless multimedia interface device and method {WIRELESS MULTIMEDIA INTERFACE APPARATUS AND METHOD}

The present invention relates to a wireless multimedia interface device and method for selecting any one of the one or more source devices and transmitting the multimedia data transmitted from the selected source device to the sink device.

In general, a high definition multimedia interface (HDMI) standard is a standard standard for transmitting video data and audio data. The HDMI system includes a source device for transmitting video and audio data and a sink device for receiving video and audio data. Here, the source device is a device for transmitting video data and audio data in the HDMI system, and the sink device is a display device for displaying video data received from the source device.

In an HDMI system, in order for a source device to transmit data to a sink device, the two devices must synchronize each other. To this end, the source device obtains device information of the sink device through a display data channel (DDC) signal line, and transmits data generated according to the device information to the sink device. The DDC signal is a signal for exchanging information with an external device besides an HDMI video signal, and an inter-integrated circuit (IIC) method is used as a data transmission method.

In addition, the HDMI system has a standard for CEC (Consumer Electronics Control) for controlling between devices. The CEC feature allows one device to remotely control another device connected with an HDMI cable.

The source device checks whether the signal detected through the Hot Plug Detect (HPD) line is at a high level whether device information can be obtained from the sink device to acquire sink device information. If the signal is at a high level, the sink device may respond at a high level, and the source device may detect this signal to obtain information about the sink device. That is, the E-EDID ROM (Enhanced Extended Display Identification Data ROM) in the sink is in a readable state. In the EDID-ROM, image format information about the image that can be output by the sink device and the physical address of the connected device are stored.

EDID is a standard for data communication between source and sink devices. For example, the EDID basic information of the display (sink device) is conveyed in the 128-byte data structure of the relevant manufacturer and work-related data.

According to the EDID / DDC standard, when the display of the sink unit is connected to the source unit, data exchange is performed between the source unit and the sink unit and supports hot plug detection.

However, there is a problem in that the image signal is not outputted because the EDID information cannot be read from the display, or when a new source device is selected, the manufacturer may not output the image due to an inconsistency in implementation of the HPD signal when the hot plug is detected. If an error occurs when the EDID information is read or the EDID information is not read, the image is output to the display device, but the image format may not match the resolution of the source data.

In addition, in order to transmit data between the source device and the sink device, the HPD signal should be at a high level. For example, when the HPD signal 5V is supplied from the source device to the sink device, the sink device receives the 5V signal and senses the high level. Thus, the source apparatus can obtain device information of the sink apparatus. In some cases, a problem of transmitting image data to the sink device occurs due to misdetection of the HPD signal.

Republic of Korea Patent No. 10-0987387 (2010.10.06) Republic of Korea Patent Publication No. 10-2010-0137693 (2010.12.31)

In order to solve the above problems, the present invention provides a wireless multimedia interface device and method for selecting any one of the one or more source devices to transmit the multimedia data transmitted from the source device to the sink device It is to.

In addition, the present invention is to provide a wireless multimedia interface device and method that enables the source devices that do not have a wireless transmitter to transmit multimedia data wirelessly.

In addition, the present invention is to provide a wireless multimedia interface device and method for preventing the mis-detection of the hot plug detection signal, when power is not applied from the source device to the sink device.

In order to achieve the above object, the wireless multimedia interface device according to the present invention

The present invention is a wireless multimedia interface device and method for selecting any one of the one or more source devices to convert the multimedia data transmitted from the selected source device to a wireless signal to transmit to the sink device, which does not include a wireless transmitter Even non-source devices can transmit multimedia data wirelessly.

In addition, the present invention can prevent the transmission of the multimedia data from the source device to the sink device due to the misdetection of the hot plug detection signal by transmitting a hot plug detection signal at a low level when power is not applied to the sink device.

1 is a block diagram of a wireless HDMI transmitter according to the present invention.
Figure 2 is a block diagram of a wireless HDMI receiver according to the present invention.
3 illustrates an E-EDID data structure related to the present invention.
4 is a schematic diagram of a wireless HDMI system in accordance with an embodiment of the present invention.
5 is a block diagram of a wireless HDMI device according to an embodiment of the present invention.

Hereinafter, exemplary embodiments will be described in more detail with reference to the accompanying drawings.

The present invention selects any one of the one or more source devices in a wireless High Definition Multimedia Interface (HDMI) environment and transmits multimedia data transmitted from the selected source device to the sink device through wireless communication. It relates to a wireless multimedia interface device. Wireless multimedia interface devices must transmit wirelessly while maintaining standard HDMI specifications.

1 is a block diagram of a general wireless HDMI transmitter, and FIG. 2 is a block diagram of a typical wireless HDMI receiver.

1 and 2, the HDMI transceiver of the wireless HDMI device complies with CEC (Consumer Electronics Control) protocol defined by the HDMI standard, transmits control signals in both directions, and sends a control command of the CEC protocol to a CEC command. Control with the command

When there are several source devices in a wireless HDMI system, conventionally, a wireless transmitter is required for each source device, but in the present invention, one or more source devices may be installed in one wireless transmitter.

As a source device, a video camera, a DVD player, a set-top box, a computer main body, and the like are used. As a sink device, a device having an HDMI input port is used for a TV, a monitor, a project, and the like.

In order to transmit data through HDMI, the source device and the wireless transmitter are connected with an HDMI cable, and signals for each pin constituting the connector of the HDMI cable are defined as shown in Table 1.

Pin number signal PIN number signal One TMDS data 2+ 2 TMDS Data 2 Shield 3 TMDS Data 2- 4 TMDS data 1+ 5 TMDS Data 1 Shield 6 TMDS Data 1- 7 TMDS data 0+ 8 TMDS Data0 Shield 9 TMDS Data 0- 10 TMDS Clock + 11 TMDS Clock Shield 12 TMDS Clock- 13 CEC 14 Spare (not connected) 15 SCL (DDC Clock) 16 SDA (DDC) 17 DDC / CEC Ground 18 + 5V power 19 Hot plug detection

The connector is equipped with Transition Minimized Differential Signaling (TMDS), HPD, DDC, and CEC signal lines. Each signal line will be described below.

The TMDS signal lines are signal lines for transmitting multimedia data and additional data such as video data and audio (audio) data of the source apparatus. The TMDS signal line includes channel Ch 0, channel 1, channel 2, and a clock line.

The CEC signal line is a signal line for bidirectionally transmitting a device control command (CEC Command) between the source device and the sink device. It is a protocol for providing a control function that allows a user to control a source device and a sink device by using a remote controller. Since devices connected in the HDMI system can communicate in both directions through the CEC signal line, the device automatically finds and sets the optimal resolution and aspect ratio that the devices can support. In addition, the CEC command, a device control command, supports the following functions.

1) One touch play: One-button play allows the device to perform playback and become active (Active_Source).

2) System Standby: All devices can be switched to Standby with the touch of a button.

3) Routing control: active source, inactive source, set stream path, routing change

4) One Touch Record

5) Deck control

6) Tuner Control

7) Device Menu Control

8) Remote Control Pass Through

The DDC signal line is a signal line for transmitting extended display identification data (EDID) of the sink device to the source device. The source device may automatically know various information such as display function and voice capability of the sink device by referring to EDID information of the sink device received through the DDC signal line.

Extended display identification data (EDID) or enhanced EDID (E-EDID) is a memory that stores identification information of each device, information on a display function and voice of a sink device, and the like. That is, information on the resolution, frequency, aspect ratio, and color space supported by the sink device is included, and information on the format of video data and audio data supported by the sink device is embedded. The E-EDID data has a structure as shown in FIG. 3, and in FIG. 3, A, B, C, and D represent physical addresses of the source apparatus.

EDID is for exchanging information between the source device and the last connected sink device (e.g. display) .The source device with HDMI port performs EDID communication, and this EDID communication should be done smoothly so that the source device can be optimized for the sink device. The resolution is output.

The power line is a power supply signal line for supplying + 5V power from the source device to the sink device, and the Hot Plug Detect (HPD) signal line is a signal line for transmitting signal status (H or L) from the source device to the sink device. . The source device recognizes whether the sink device is connected according to the HPD signal received through the HPD signal line, starts EDID communication, and outputs an image signal.

The sink device may control the source device by transmitting a CEC command to the source device through the CEC signal line to control the source device. Here, the CEC command is a command that can be controlled simply by exchanging mutual commands between the source device and the sink device.

All devices in an HDMI system are defined by name and distinguishable address. In HDMI systems, device names can be used to create defined standard or specific descriptor files. For example, a device name, a physical address of the device, a logical address, a product type, and the like may be defined in the descriptor file as shown in [Table 2]. The product type defines 15 types of devices in the CEC specification. When sending a CEC command between devices, it recognizes the device as a logical address and sends it.

Device name Physical address Product form OSDn Logical address CECDev00 0000 0 (TV) TVOSDN 0 CECDev01 1000 4 (DVD) DVD1 2 : : : : : CECDev15 40000 10 (reserved) Reserved 15

To set the sink device as an output, set the device name, device physical address and product type through the CEC command.

-------------------------------------------------- ------

CEC1: CECL CECDev03 // Set CECdev3 to HDMITx Output1

CEC1: PA 0000 // set to '0000'

CEC1: PR 4 // Set product type to 4

-------------------------------------------------- ------

The CEC command consists of a request message requesting another device to get an action or information and status information indicating the location of the device in the HDMI system. The CEC command includes a command directly sent only to a specific device and a command sent to all devices in the HDMI system.

As mentioned above, CEC is used to control devices connected within an HDMI system. CEC's protocol follows the CEC standard as a standard. When sending a CEC command, the logical address of the device is used to define the start and destination of the CEC command. Logical addresses are allocated for each device, and referring to the logical address can determine the type of a connected device. Since the initiator address of the CEC command is referenced, the device that sent the command can be known. In addition, the destination address included in the CEC command may be referred to to which device the command is sent. The source device checks the contents of the EDID data of the sink device and checks the HDMI company and the physical address.

4 is a block diagram of a wireless high-definition multimedia interface system according to an embodiment of the present invention, Figure 5 is a block diagram showing a transmitter of a wireless multimedia interface device according to an embodiment of the present invention.

As shown in FIG. 4, a wireless high definition multimedia interface (HDMI) system includes one or more source devices 10, a wireless HDMI transmitter 20, a wireless HDMI receiver 30, and a sink device ( 40). In the present invention, the wireless HDMI transmitter 20 and the wireless HDMI receiver 30 is described as an independent configuration, for example, the wireless HDMI transmitter 20 and the wireless HDMI receiver 30 may be integrally formed. The wireless HDMI transmitter 20 and the wireless HDMI receiver 30 are wireless multimedia interface devices capable of wirelessly transmitting and receiving multimedia data between the source device 10 and the sink device 40 in a wireless HDMI system.

The source devices 10 are wired to the wireless HDMI transmitter 20 through an HDMI cable, and wirelessly transmit multimedia data such as image data and audio (audio) data through the wireless HDMI transmitter 20. The source apparatus includes a DVD player, an audio amplifier, a set-top box, a computer, a game machine, a mobile terminal, and the like.

The wireless HDMI transmitter 20 has one or more ports (not shown) to which connectors of the HDMI cable are connected. The wireless HDMI transmitter 20 selects the physical address of the source device 10 using the CEC command [Active_Source_Physical Address] to select one of the one or more source devices 10. .

The wireless HDMI transmitter 20 converts the multimedia data transmitted from the selected source device 10 into a wireless signal and transmits it to the sink device 40. The sink device 40 is a display device such as a TV.

Referring to FIG. 5, the wireless HDMI transmitter 20 includes a wireless transmitter 24 that converts a signal input with one or more source devices 10a and 10b into a wireless device and transmits the signal to the sink device 40. Here, the case where two source devices are connected to the wireless transmitter is described, but three or more source devices 10 may be connected to the wireless transmitter 24.

The wireless HDMI transmitter 20 includes one or more EDIE-ROMs 21a and 21b in which device information of the source devices 10a and 10b are stored, respectively. Here, the device information of the source devices 10a and 10b is the physical address of the source devices 10a and 10b, and the physical address is used to distinguish the source devices 10a and 10b.

In addition, the EDIE-ROMs 21a and 21b also store image format information regarding an image that the sink device 40 can output, and a physical address of the sink device 40.

The source devices 10a and 10b are connected to the TMDS selector 22 and the HDMI controller 23 and wirelessly transmit the video data and the audio data included in the video signal through a transition minimized differential signal (TMDS) channel. Transmit to HDMI transmitter 20.

The HDMI controller 23 selects one source device 10a or 10b of one or more source devices 10a and 10b using the one-touch play function of the CEC function. The selector 22 selectively transmits multimedia data transmitted from one of the one or more source devices 10a and 10b under the control of the HDMI controller 23.

For example, when the image data of the source device 1 (10a) is to be displayed as the sink device 40, the CEC command "Active_Source_1.0.0.0" is transmitted and the data of the source device 2 (10b) is synchronized with the sink device ( 40), send the CEC command "Active_source_2.0.0.0". The HDMI controller 23 selects the video data of the source device 1 (10a) or the source device 2 (10b) and wirelessly transmits to the sink device 40 based on the CEC command. In other words, when the source device 1 (10a) is connected to the wireless HDMI transmitter 20, the data of the source device 1 (10a) is displayed on the sink device (40). On the other hand, when the source device 2 (10b) is connected to the wireless HDMI transmitter 20, the data of the source device 2 (10b) is displayed on the sink device (40).

The HDMI controller 23 monitors the CEC commands transmitted from the source devices 10a and 10b, checks whether [Active_source_physical address] is transmitted from the source devices 10a and 10b, and [Active_source_physical address]. Is received, the source device 10a and 10b are selected by referring to the address table. At this time, the physical addresses of the source devices 10a and 10b are changed into logical addresses. The HDMI controller 23 generates a source device selection command including the logical address of the selected source device and transmits the generated source device selection command to the selector 22.

The HDMI controller 23 may generate a management table for managing the state in which the source devices 10 are connected. The management table is associated with a logical address and an identifier of the device. Obtaining the logical address of the source device 10 by the CEC command accurately identifies which HDMI device is connected and controls the selector 22 to switch to the TMDS link (signal line) connected to the selected source device.

The address table includes a physical address and a logical address used to determine the connection state of the source devices 10a and 10b and is stored in advance in the HDMI controller 23. The device name of the source device 10 is registered in the logical address.

The HDMI controller 23 also selects one of the TMDS channels. The TMDS selector 22 transmits the data received through the channel selected under the control of the HDMI controller 23 to the radio transmitter 24. The radio transmitter 24 converts the received data into a radio signal and transmits the data to the sink device 40. On the other hand, if there is no source device connected, the HDMI controller 23 does not need to switch the TMDS link (signal line) since there is no registered address.

The radio transmitter 24 converts the received multimedia data and control data into radio signals and transmits them to the outside. As such, the wireless transmitter 24 transmits the video and audio data transmitted from the source device 10 to the sink device 40, and the sink device 40 receives and outputs the video and audio data.

Another method of selecting the source devices 10a and 10b is to use the stream path setting command among the CEC commands. The stream path setting message is a function of identifying the source devices 10a and 10b providing the image by the CEC command and the source device 10a and 10b as the parameter of the source device 10a and 10b displaying the image as a switching message. The physical address of is added and output. This command selects the specified device as the operation target device. From the source devices 10a and 10b connected by HDMI, the desired source devices 10a and 10b are accurately selected and sent wirelessly.

The HDMI controller 23 detects whether the sink device 40 is connected and stops the transmission of the multimedia data transmitted from the selected source device 10a or 10b when the sink device 40 is not connected. In other words, the wireless HDMI receiver 30 detects the connection of the sink device 40 by detecting the PHD signal transmitted from the sink device 40 and, if the sink device 40 is not connected, sends the signal to the HPD signal. Send a low level. For example, if power is not detected at the sink device 40, the wireless HDMI receiver 30 transmits a low level with an HPD signal. Therefore, the controller 23 can prevent the multimedia data transmission of the source apparatuses 10a and 10b due to the misdetection of the HPD signal.

10, 10a, 10b: source device
20: wireless transmitter
30: wireless receiver
40: sink

Claims (5)

A selector which is wired to one or more source devices and selects one of the one or more source devices to receive multimedia data transmitted from the selected source device;
A controller for monitoring whether one or more source devices are connected and transmitting a source device selection command to the selector according to the monitoring result;
And a wireless transmitter for converting and transmitting multimedia data transmitted through the selector into a wireless signal under the control of the controller. The method of claim 1, wherein the controller,
And identifying a source device connected through a physical address included in the device control command transmitted to the at least one source device. The method of claim 1, wherein the controller,
And generating the source device selection command using a logical address corresponding to the physical address with reference to a previously stored address table. The method according to claim 2 or 3,
And said device control command conforms to the CEC protocol. The method of claim 1,
The controller stops the transmission of the multimedia data transmitted from the selected source device if the connection of the sink device is not detected.
KR1020120056743A 2011-05-30 2012-05-29 Wireless multimedia interface apparatus and method KR20120134051A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (2)

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KR1020110051387 2011-05-30
KR1020120056743A KR20120134051A (en) 2011-05-30 2012-05-29 Wireless multimedia interface apparatus and method

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