KR100966500B1 - A Method For Transmitting/Receiving Control Data between HDMI Devices And Devices Therefor - Google Patents

Abstract

Disclosed are a method and apparatus for transmitting and receiving data for controlling an HDMI device. The data transmission method may include storing, in a sink device, data to be transmitted to a source device in a predetermined specific buffer, and determining whether a message having a predetermined specific address is received from the source device. And transmitting the data stored in the specific buffer to the source device when the message is received.

HDM, HDMI DDC, Master, Slave, Device Control

Description

A method for transmitting / receiving control data between HDMI devices and devices therefor}

The present invention relates to a method for transmitting and receiving data for controlling an HDMI device (HDMI), and a device for transmitting and receiving the same, for controlling through communication using a DC line between devices supporting HDMI communication (HDMI). A method and apparatus for transmitting and receiving data.

HDMI (High Definition Multimedia Interface) is a standard for transmitting high-definition video and multi-channel audio data through a complete digital interface by connecting devices supporting it through a single cable. .

According to the HDMI standard, a connector consisting of mostly 19 pins can be used to connect electronic devices, computers, etc., and to transmit uncompressed video and audio data, with most resolutions ranging from 480p to 1080p or higher. Can support video format standard.

In other words, HDMI provides a digital interface to transmit video data without compression, so for example, when connecting a DVD player and a television set, the digital signal is converted into an analog signal and the digital signal is converted again. The video quality is not degraded by the conversion to the signal.

In addition, HDMI (HDMI) is a video display of a display device such as a television (TV) or a monitor through the HDMI to build an intelligent interface connecting a variety of devices, such as a home entertainment system And Display Data Channel (DDC) technology, which is capable of "automatic format adjustment," by recognizing the audio format.

In addition, HDMI supports Consumer Electronic Control (CEC) technology as an option, providing a link for bidirectional communication and mutual control between HDMI devices, for example, a remote controller of a television (TV). The output of a camcorder connected through HDMI CEC can be controlled by using.

However, in this HDC, CEC is defined as an option, and for HDMI devices that do not support CEC, the control is required for control other than video and audio data transmission. There is a problem that communication is not possible.

Disclosure of Invention An object of the present invention is to provide a method and apparatus for transmitting and receiving data for controlling an HDMI device for controlling a counterpart device through a DC line communication between HDMI devices.

According to an aspect of the present invention, there is provided a transmitting and receiving method, comprising: storing, in a sink device, data to be transmitted to a source device in a predetermined specific buffer; Determining whether a message having a predetermined specific address is received from the source device; And when the message is received, transmitting the data stored in the specific buffer to the source device.

In addition, the message may be periodically transmitted from the source device.

In addition, the message reception and the data transmission may be performed through an HDMI (DDC) communication line.

In addition, the specific address may be defined as a slave address defined in the HDMI (DDC) communication.

The data may be generated in a format conforming to HDMI (CEC) standard.

The data may also include a control command for controlling the source device.

According to another aspect of the present invention, a data transceiver includes: a buffer for storing data to be transmitted to a source device; An interface for communicating with the source device; And a controller configured to determine whether a message having a predetermined specific address is received from the source device and to transmit the data stored in the buffer to the source device through the interface when the message is received.

In this case, the interface may be an HDMI communication interface.

Accordingly, even HHD devices that do not have HMC CC are assigned and assigned a new address to DDC communication of HHD standard. A control function for an HDMI device may be performed.

According to the present invention, an HDMI device connected by transmitting and receiving data for controlling the connected HDMI device using a DC communication interface, which is essentially included in an HDMI device, is connected to the HDMI device. The device can be controlled to provide a simple and efficient HMI device control method.

Hereinafter, with reference to the accompanying drawings will be described embodiments of the present invention;

As described above, the DC is essentially applied to the HDMI device, and the DC communication is performed using the connector according to the aforementioned HDMI standard. ) Is used to determine the video display and audio format of a display device such as a television (TV) in a source device such as a player.

To this end, the HDMI source device, the display device that supports HMI (HDMI) is required to display the Extended Display Identification Data (EDID) information, for example, the manufacturer name, product type Information, such as supported video resolutions and supported audio formats, is received from the display device through a DC interface.

Accordingly, the source device receiving the EDID information automatically adjusts the video and audio output most appropriate for the display device, so that the user does not need to adjust it separately.

High-bandwidth Digital Content Protection (HDCP) also uses a DCC channel. HDCP (HDCP) is a standard for digital content certification provided by HDMI (HDMI), such as a set-top box, HD-DVD player, HD Blu-ray disc player, etc. There is a need for HMD devices capable of outputting content.

HDCP is a key that a source device and a receiving device, ie, a sink device, are called a Key Selection Vector (KSV) through HDDC's DDC channel. This is done by performing mutual authentication by exchanging.

The device control method through HDMI communication according to the present invention is adapted to transmit and receive data for control between HDMI devices using such a DC channel communication interface.

First, the method for controlling a device through HDMI communication according to the present invention includes various types of sink devices such as a digital television (D-TV) equipped with an HDMI interface and a DVD (DVD). It can be applied to motion control between various types of source devices such as players.

1 is a diagram illustrating an HMI communication system to which a device control method through HMI communication according to the present invention is applied.

As illustrated in FIG. 1, an HMI communication system includes a sink device 100 and a source device 200.

For example, as shown in FIG. 1, in a sink device 100 such as a digital television (D-TV) to which the present invention is applied, an HDM sync interface for performing HMD communication according to the present invention. 110, the overall control of the operation of the sink device 100, and in particular, the HDMI Sink interface 110 to control the DC device and the source device 200 to process the data received or to be transmitted. A memory 130 such as a microcomputer 120 for performing a function of a processor, and an EEPROM for storing various data required for performing an operation according to various functions of the sink device 100 are included. In addition, the sink device 100 may further include an input unit 140 for receiving a user command.

Meanwhile, in the description of the sink device 100 and the source device 200, the components that may not be essential for describing the device control method through the HDMI communication according to the present invention are not illustrated and described herein. It is revealed.

In addition, the source device 200, such as a set-top box (STB) or a recorder, includes an HMD source interface 210 and an HMD disc for performing communication with the sink device 100. A processor 220 is included to perform various data processing necessary to perform CSE communication. In addition, components such as Y. pyrom are omitted in the drawings. The processor 220 may also perform an overall control function of the source device 200.

The HDM interfaces include interfaces for transition minimized differential signaling (TMDS) communication and interfaces for DCC communication, respectively.

The sink device 100 corresponds to a master device in TMS communication, but corresponds to a slave device in DC communication. In addition, the source device 200 corresponds to a slave device in the TMS communication, but corresponds to a master device in the DC communication.

The TDMS interface provides three TMS channels through an HMI interface to transmit a large amount of digital video / audio data. Each TMS channel supports a transmission rate of 3.4 Gbps, which enables data transmission of a total of 10.2 Gbps.

In addition, as described above, the DC interface allows the source device 200 to receive EDID information from the sink device 100 to automatically adjust the video and audio output most suitable for the sink device 100. It is used to exchange the aforementioned KSV key between the source device 200 and the sink device 100 as well as to perform mutual authentication according to HDCP.

In order to receive EDID information and HDCP authentication performed through the DDC channel interface, HDMI is used for HDDC communication. A slave address is defined.

FIG. 2 is a table illustrating an example of slave addresses for HDMI (DDC) communication according to the present invention.

Referring to the drawings, a write slave address (R-CTRL) and a write slave address (W-CTRL), in addition to the general EDID slave address and HDCP slave address, are used for the DC communication according to the present invention. Additionally defined.

The source device 200, which is a master device for DC communication, inserts the slave address as described above into the header field and inserts data corresponding to the data field and transmits the data to the sink device 100, which is the slave device. The data to be inserted into the data field may be, for example, data conforming to the HMC standard.

On the other hand, in the microcomputer 120 of the sink device 100, for example, when a control request for controlling the operation of the source device 200 through the input unit 140 or HDM sync interface 110, etc. The control message is generated according to the control request and stored in the read buffer (R-buffer) 123. The control message may be written in a data format according to the CEC standard. The read buffer 123 may store a response message to the control message received by the sink device 100 from the source device 200. Accordingly, the sink device 100 and the source device 200 can be mutually controlled.

Since the sink device 100 corresponds to a slave device in the DC communication, the sink device 100 cannot actively transmit a control message to the source device 200. Therefore, the source device 200 periodically transmits a message including the read slave address (R-CRTL) in the header field to the sink device 100 as shown in FIG. 2, and receives the sink device 100. Outputs a control message stored in the read buffer 123 to be transmitted to the source device 200. Therefore, it is possible for the sink device 100, which is a slave device, to control the source device 200 in the DC communication.

For example, when a user requests a control command for the source device 200 through the input unit 140 of the sink device 100, the sink device 100 reads the control message according to the read buffer 123. And the source device 200 periodically transmits a message including a read slave address (R-CRTL), that is, a read control signal, to the sink device 100 through the HMD DC communication interface. The control message stored in 123 may be taken and processed.

Meanwhile, the source device 200 has data to be transmitted through the DC communication interface such as a control message to be transmitted to the sink device 100 or a response message to the control message received from the sink device 100. If there is, a message including a write slave address (W-CTRL) in a header field may be created and transmitted to the sink device 100. A message containing a write slave address (W-CTRL), i.e., a write control signal, may be created whose corresponding data field is for example in accordance with the CEC data format.

Accordingly, the sink device 100 receiving the write control signal stores the received data in the write buffer (W-buffer) 121, and the microcomputer 120 outputs the data from the write buffer 121 to process. Can be.

3 and 4 illustrate operation flowcharts for transmitting and receiving data in a sink device for performing a device control method through HMI communication according to the present invention.

For example, as described above with reference to FIG. 2, in the microcomputer 120 of the sink device to which the present invention is applied, in order to transmit and receive a control command with the source device 200 connected through the HDM interface 110. It is determined whether one of the write slave address (W-CTRL) or the read slave address (R-CTRL) is inserted in the header field included in the message transmitted from the source device 200, and accordingly, the write buffer 121 Each operation stores the received data or outputs the data stored in the read buffer 123 and transmits the data to the source device 200.

 Referring to FIG. 3, when the control request occurs as described above (S410), the microcomputer 120 of the sink device 100 generates a control message including a control command according to the control request and reads a buffer (R). -buffer) to store in step 123 (S420).

Then, the microcomputer 120 of the sink device 100 checks whether a message including the read slave address R-CRTL in the header field is received from the source device 200 (S430), and sets the read slave address. When the message including the message is received, the control message stored in the read buffer 123 is output and transmitted to the source device 200 through the DC communication interface of the HDMI sink interface 110 (DDC). S440). Accordingly, the processor 220 of the source device 200 interprets the control message received through the HDMI source interface 210 and controls the operation of the source device 200 according to a control command corresponding thereto. do.

Referring to FIG. 4, when the sink device 100 receives a message including a write slave address (W-CTRL) in a header field from the source device 200 through an HMI source interface 110. In operation S510, a message including the received write slave address W-CTRL is stored in the write buffer 121. Accordingly, the microcomputer 120 of the sink device 100 outputs the stored message from the write buffer 121 (S530), processes the message, and interprets the data included in the message (S540). When the data corresponds to, for example, a control command, the microcomputer 120 of the sink device 100 controls the sink device 100 accordingly according to the information included in the data. You can control the operation.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those of ordinary skill in the art to which the present invention pertains, as described above and It is not limited by the drawings.

1 is a diagram for explaining an example of an HMI communication system to which an embodiment of the present invention is applied.

2 is a table illustrating information required for communication for controlling between HDMI devices according to an embodiment of the present invention.

3 and 4 are flowcharts illustrating a data transmission and reception method according to an embodiment of the present invention.

Claims (12)

In a sink device, storing data including a control command of the source device to be transmitted to a source device in a predetermined specific buffer of the sink device; Determining whether a message having a predefined slave address is received by the sink device from the source device to receive data to be transmitted from the sink device; And And when the message is received at the sink device, transmitting the data stored in the specific buffer to the source device through the same communication line as the communication line at which the message is received. The method of claim 1, And the message is periodically transmitted from the source device. The method according to any one of claims 1 and 2, Receiving and transmitting the data is the transmission and reception method, characterized in that performed via the HDMI (DDC) communication line. The method of claim 3, wherein The slave address is a transmission and reception method, characterized in that predefined in accordance with the provisions of the HDMI (DDC) communication. The method of claim 3, wherein The data is transmitted and received, characterized in that the format is generated in accordance with the HDMI (CEC) standard. delete A buffer for storing data including a control command of the source device to be transmitted to a source device; An interface for communicating with the source device; And From the source device, it is determined whether a message having a slave address defined in order to receive data to be transmitted from the sink device is received through the interface, and if the message is received, the data stored in the buffer is stored in the interface and And a control unit for transmitting the message to the source device through the same communication line as the received communication line. The method of claim 7, wherein And the message is periodically transmitted from the source device. The method according to any one of claims 7 and 8, The interface is a data transmission and reception device, characterized in that the HDMI (DDC) communication interface. The method of claim 9, The slave address is a data transmitting and receiving device, characterized in that predefined in accordance with the provisions of the HDMI (DDC) communication. The method of claim 9, The data transmitting and receiving device, characterized in that the data is generated in a format according to the HDMI (CMI) CMC standard. delete

Images