KR20050058660A - Apparatus and operation method for transmission and channel change of digital broadcast stream in the home network system - Google Patents

Abstract

The present invention relates to an apparatus for transmitting and changing a digital broadcast stream on a home network system and a method of operating the same. In particular, the system of the present invention provides a home server for receiving a digital stream signal and transmitting the received digital stream signal, and a home server. At least one sub-device for requesting the digital stream signal received, received and decoded and output the digital stream signal, and a wired network of IEEE1394 for connecting between the home server and the sub-device. Therefore, the present invention transmits the digital broadcast stream received at the host receiver of the home server to the receiver of the indoor sub-device located in another location far from the receiver, and by changing the receiving digital stream channel at the request of the sub-device. It is possible to extend the viewing and listening services of the home network system.

Description

Apparatus and method for operating digital broadcast stream transmission and channel change in home network system {APPARATUS AND OPERATION METHOD FOR TRANSMISSION AND CHANNEL CHANGE OF DIGITAL BROADCAST STREAM IN THE HOME NETWORK SYSTEM}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a home network system having a digital broadcast receiver and a digital audio or video device, and a method of operating the same. In particular, in a network connected with an IEEE1394 serial bus, a digital broadcast stream received through a host receiver is located far from the receiver. The present invention relates to an apparatus for transmitting and changing a digital broadcast stream on a home network system capable of transmitting to an audio / video device of a sub receiver and changing a channel of a received broadcast stream.

Home network system is a system that delivers information by connecting each space (household / kitchen / living room / front door) of the house.It is a system that connects the house to the network using the home appliances that are already installed in each space of the house. to be. When such a home network is established, external information can be directly connected through home appliances such as an air conditioner / TV as well as a connection to a PC through a server when connecting a home and an outside.

Meanwhile, IEEE1394 has been widely adopted as a wired network interface for connecting digital audio devices of a home network system or multimedia peripheral devices such as video devices and cameras. IEEE1394 supports isochronous transmission and asynchronous transmission at the same time. In isochronous transmission, continuous data streams such as video and audio streams are transmitted at high speed, and asynchronous transmission is used for transmission of various commands or discontinuous data.

Recently, a digital television used as a home server of a home network system receives a digital broadcast stream of a program channel from a set-top box, extracts and decompresses compressed video and audio data such as MPEG2 and outputs it to a display unit. .

However, not only the service of the home network system centered on the home server is still limited, but also the technology for transmitting the broadcast stream received by the receiver of the digital television to each sub-device and changing the channel of the broadcast in the home network system connected by IEEE1394 It is still under research and development.

Moreover, since digital television is equipped with a personal video recorder (PVR) function that stores digital or analog broadcasts on digital devices, users can transmit and receive digital broadcast streams or streams stored on PVR recording media from sub devices anywhere in the home. This service is not provided in the home network system yet.

An object of the present invention is to transmit the digital stream signal received at the host receiver of the home server to the receiver of the sub-device which is located at a different location far from the receiver in order to solve the problems of the prior art as described above, The present invention provides an apparatus for transmitting and changing a digital broadcast stream and a method of operating the same on a home network system capable of extending a viewing and listening service of a home network system by enabling a broadcast channel of a digital stream being received.

In order to achieve the above object, the present invention provides a home network system, comprising: a home server for receiving a digital stream signal and transmitting the received digital stream signal, and requesting, receiving, decoding, and outputting the digital stream signal from the home server; And at least one sub device and a wired network connecting the home server and the sub device.

In the present invention, the home server includes a digital television and a host receiver connected thereto, wherein the host receiver includes a tuner for selecting a broadcast channel of the digital stream signal, a demodulator for converting a signal of the broadcast channel selected by the tuner into a compressed digital stream signal; And a packet converter for converting the compressed digital stream signal into a transport packet, and an interface for transmitting the transport packet.

In the present invention, each sub device includes a video or audio device and a sub receiver connected thereto. The sub receiver includes an interface for receiving a transport packet, a packet converter for converting the transport packet into a compressed digital stream signal, and a packet converter. A decoder for decoding a negative digital stream signal, and a signal converter for converting the decoded signal into a video or audio signal and output to a video or audio device.

In order to achieve the above object, the method of the present invention provides a method of operating a home network system having at least one or more sub-devices receiving and receiving a digital stream signal from a home server and a wired network connecting the home server and the sub-devices. A request for establishing a session from a sub device to a home server, determining whether a channel allocation for transmitting a digital stream signal from the home server to the sub device is possible, and if the channel is available from the home server, Receiving the requested broadcast channel information from the digital broadcast signal and converting the digital stream signal according to the requested broadcast channel into a transport packet of the wired network protocol, and delivering the converted transport packet to the sub device in the allocated channel in the home server. Include.

In order to achieve the above object, another method of the present invention provides a method of operating a home network system having at least one or more sub-devices receiving and receiving a digital stream signal from a home server and a wired network connecting the home server and the sub-devices. A method for transmitting a digital stream signal of another broadcast channel to a sub device, and requesting a home server to change a digital stream signal of an arbitrary broadcast channel to another broadcast channel. Determining whether a channel has been allocated; converting a digital stream signal of another broadcast channel requested by a sub-device into a transport packet of a wired network protocol if the channel has already been allocated by the home server; To the sub device through the assigned channel. And a step.

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

1 is a diagram illustrating a home network system according to an embodiment of the present invention. Referring to FIG. 1, the home network system 1 according to the present invention receives a digital stream signal and transmits the received digital stream signal to the home server 10 and requests the digital stream signal from the home server 10. At least one sub device (20, 30) received and decoded and output, and a wired network 40 for connecting between the home server 10 and the sub device (20, 30).

The home server 10 includes a digital television 14 and a host receiver 12 connected thereto to transmit the digital broadcast stream signal received from the host receiver 12 to the sub devices 20 and 30 through the wired network 40. send.

Each sub device 20, 30 includes a video or audio device (eg, digital television, display, etc.) 24, 34 and sub receivers 22, 32 connected thereto and the digital broadcast stream transmitted from the home server 10. The signal is received and output to the video or audio device 24 or 34.

The wired network 40 connects the home server 10 and at least one sub device 20, 30 as a transmission bus of the IEEE 1394 protocol.

For example, assuming that the home server 10 of the home network system of the present invention is placed in a living room, each of the sub devices 20 and 30, which are video / audio devices connected to the home server 10 through the wired network 40, are mutually connected. It is located in a different location, a room or a kitchen, so that the digital broadcast of the home server 10 can be viewed or listened to from another remote location, and the receivers 22 and 32 of the sub devices 20 and 30 can receive the broadcast channel. By changing, the broadcast channel of the changed channel can be received from the home server 10.

2 is a detailed block diagram of a host receiver having a device for transmitting and changing a digital broadcast stream in a home network system according to an embodiment of the present invention.

2, a host receiver 12 in a home server of a home network system includes a tuner 122 that tunes a broadcast channel of a digital stream signal in which video, audio, and program data is compressed to MPEG-2 or the like. A demodulator 124 for extracting the compressed digital stream signal from the signal of the broadcast channel tuned in step 122, a packet converter 125 for converting the compressed digital stream signal to the IEEE1394 protocol of the transport packet, and An interface 127 for transmitting a packet, a decoder 128 for decoding a compressed digital stream signal, and a signal converter 129 for converting the decoded signal into a video and audio signal and outputting it to a digital television. .

The tuner 122 has a form in which one or more are mounted regardless of terrestrial, satellite, and cable broadcasting. The demodulator 124 is configured with different demodulator circuits depending on whether the channel signal tuned by the tuner 122 is a terrestrial signal, a satellite signal, or a cable signal. The demodulator circuit may be composed of several signal processing modules or may be configured to process different signals in one chip.

The decoder 128 filters the stream input unit 1282 into which the compressed digital stream signal is input, the CA module unit 1283 which is a subscriber authentication module for providing a service according to a subscription condition of a service subscriber, and the digital stream signal. A filter unit 1286, a video decoder 1284 for decoding the video signal from the digital stream signal, and an audio decoder 1288 for decoding the audio signal from the digital stream signal. The signal converter 129 includes a video signal converter 1292 for outputting the video signal decoded by the decoder 128 to the digital television, and an audio signal converter 1294 for outputting the decoded audio signal to the digital television. It consists of.

The packet converter 125 converts the format of the compressed digital stream signal extracted by the demodulator 205 to the IEEE1394 protocol, which is the wired network 40, converts the format into a transport packet having the IEEE1394 protocol, and transmits the converted packet to the sub device. .

The host receiver 12 of the present invention further includes a channel resource manager 126 for storing and managing the relationship information between the isochronous channel and the broadcast channel of the IEEE1394. Here, the channel resource manager 126 manages and stores the broadcast type and the broadcast channel as table data by mapping the isochronous channel of IEEE1394.

In addition, when the host receiver 12 requests that the sub device receives a digital stream signal of another broadcast channel, the host receiver 12 changes the channel of the tuner 122 using the channel change protocol of IEEE1394 and packet-converts the digital stream signal of the changed channel. The unit 12 converts the packet into a transport packet of the IEEE 1394 protocol, and then transmits it to the interface 127. At this time, the channel change protocol uses the asynchronous communication method of IEEE1394.

On the other hand, when the broadcasting channel is changed, the channel resource manager 126 of the host receiver 12 checks whether a channel required for transmitting a digital stream signal to the IEEE1394 protocol is determined, and when the channel is allocated, the channel of the tuner 122 is received. Is changed, and the stream signal of the changed channel broadcast is converted into a transport packet of the IEEE1394 protocol through the packet converter 12, and then transmitted to the interface 127.

3 is a detailed configuration diagram of a sub receiver in a home network system according to an embodiment of the present invention.

Referring to FIG. 3, the sub receiver 22 of the home network system of the present invention is an interface 210 for receiving a transport packet from a home server, and a packet for converting a transport packet of the IEEE1394 protocol into a compressed digital stream signal. A converter 212, a decoder 220 for decoding the digital stream signal of the packet converter 212, and a signal converter 240 for converting the decoded signal into a video or audio signal and outputting the video or audio device. It is composed of Here, the decoder unit 220 may provide a stream input unit 222 to which a compressed digital stream signal is input, a CA module unit 223 which is a subscriber authentication module for providing a service according to a subscription condition of a service subscriber, and a digital stream signal. And a filter unit 226 for filtering, a video decoder 224 for decoding the video signal from the digital stream signal, and an audio decoder 228 for decoding the audio signal from the digital stream signal. The signal converter 240 includes a video signal converter 242 for outputting the video signal decoded by the decoder 220 to the digital television, and an audio signal converter 244 for outputting the decoded audio signal to the digital television. It consists of.

4A and 4B are structure diagrams of a source packet of an IEEE1394 and a header thereof of a home network system to which the present invention is applied.

In order to be able to transmit the stream signal through the IEEE1394 protocol, MPEG-2 which is a 188-byte transport stream 104 according to the scheme of Part4: MPEG-2 date transmission of IEC61883-4 as shown in FIG. 4A. A total of 192 bytes of Source Packet (106) by adding a source packet header (SPH) 102 defined in IEC61883-4 of 4 bytes to a TS packet (TSP) at the beginning of the TSP. )

In FIG. 4B, the format of a source packet header (SPH) 102 is shown. A source packet header (SPH) 102 of one quadlet (4 bytes) is represented by the least significant bit (LSB) in the most significant bit (MSB). It consists of a 7-bit reserved area 202, a 13-bit cycle counter 204, and a 12-bit cycle offset 206 in this order. These values are equal to the 25-bit value in the cycle time register of the IEEE1394 protocol. This is the value used to reconstruct isochronous data in the sub receiver.

5 is a CIP header structure diagram of IEEE1394 of a home network system according to the present invention. The source packet reconstructing the MPEG-2 TS packet (TSP), which is the transport stream 104, adds two quadlets of CIP headers defined in IEC61883-1. This CIP header is shown in FIG.

Referring to FIG. 5, the CIP header 300 includes a 6-bit source node ID (SID) 302, an 8-bit date block size in quadlets 304, and a 2-bit FN 306. ) 3-bit Quad Padding Count (QPC) 308, 1-bit Source Packet Header (SPH) 310, 2-bit Reserved Area 312, 8-bit Data Block Continuity Counter (DBC) 314 , 6 bit FMT (Format ID) 316, and FDF (Format Dependent Field) 318. Here, the DBS 304 has a value corresponding to '00000110', that is, 6 quadlets and 192 bytes. FN 306 has '11' and indicates that one source packet includes eight data blocks. QPC 308 indicates that no padding exists in the packet reconstructed to '000'. SPH 310 indicates that a source packet header exists as '1'. The FMT 316 has a value of '100000', which means that the transport format is an MPEG-2 transport stream signal.

The reconstructed stream signal is transmitted to the established channel when the transport channel connection is established between the host receiver of the home server and the sub receiver of the sub device.

6 is a flowchart illustrating a method of transmitting a digital broadcast stream between a host receiver and a sub receiver in a method of operating a home network system according to the present invention. 1 to 6, according to the present invention, a method of transmitting a digital broadcast stream through channel connection between a host receiver and a sub receiver in a home network system is as follows. At this time, the session establishment of the channel between the host receiver and the sub-receiver is made through asynchronous communication of the IEEE1394 protocol.

The host receiver 12 of the home server 10 transmits / receives a digital broadcast stream signal. In case of reception, the host receiver 12 of the home server 10 receives a digital stream signal through which the video, audio, and program data are compressed to MPEG-2 through the tuner 122. The broadcast channel is tuned and the compressed digital stream signal is extracted from the tuned broadcast channel signal through the demodulator 124. The decoder unit 128 of the host receiver 12 decodes the compressed digital stream signal, and the signal converter 129 converts the decoded signal into video and audio signals for transmission to the digital television 14. S100)

The interface 127 of the host receiver 12 in the home server 10 waits for a request for session establishment from an FCP area of the IEEE 1394 from any sub device 20 (S102).

A remote session request message (RemoteSessionRequest) for setting up a channel session of the host receiver 12 is transmitted from any sub-device 20 to the interface 127 of the host receiver 12 (S104). The message is transmitted to the host receiver 12 of the home server 10 via the transmission bus of IEEE1394, which is the wired network 40.

The host receiver 12 of the home server 10 receives the remote session request message (RemoteSessionRequest) received from the interface 127 and checks whether the message is an appropriate message, and the digital resource stream from the channel resource manager 126 to the sub device 20. It is determined whether channel allocation for transmitting a signal is possible (S106).

If the sub device 20 has an assignable channel, the host receiver 12 occupies a temporarily assignable channel and includes the occupied channel value in the response message to interface a remote session setup success message (RemoteSessionSetupSuccess) with the response message. To 127. However, if no assignable channel exists, the host receiver 12 transmits a remote session setup failure message (RemoteSessionSetupFail) as a response message to the interface 127. (S108) The response message is a wired network 40. It is transmitted to the sub receiver 22 of the sub device 20 via the transmission bus of IEEE1394.

The interface 210 of the sub receiver 22 of the sub device 20 receives a remote session setup success message (RemoteSessionSetupSuccess), which is a response message from the home server 10, to receive a listener for isochronous stream reception. The sub receiver 22 registers with the receiver (S110).

In addition, the sub receiver 22 of the sub device 20 transmits a remote stream request message (RemoteStreamRequest) to the home server 10 to receive a stream through a temporarily allocated channel included in the response message through the interface 210. Transmit, but include the broadcast type (eg, terrestrial, satellite, cable, etc.) and the broadcast channel to be received in the remote stream request message (S112). The request message is transmitted through a transmission bus of IEEE1394, which is a wired network 40. Is sent to the host receiver 12 of the home server 10.

A remote stream request message (RemoteStreamRequest) is received through the interface 127 of the host receiver 12 of the home server 10 to confirm that the sub receiver 22 of the sub device 20 is ready to receive a stream signal. . The host receiver 12 changes the reception channel of the tuner 122 according to the broadcast type and broadcast channel requested in the remote stream request message (RemoteStreamRequest). The channel resource management unit 126 of the host receiver 12 registers the changed broadcast type and broadcast channel to the isochronous channel of the IEEE 1394 and registers the mapping table data. (S114) This table stores the digital broadcast recorded in the future. It is also used when transmitting a stream signal to a sub device.

After the channel of the tuner 122 is changed, the interface 127 of the host receiver 12 transmits a remote stream request success message (RemoteStreamRequestSuccess), which is a response message to the remote stream request, to the sub receiver 22. If the change is unsuccessful, the remote stream request failure message (RemoteStreamRequestFail) is transmitted. (S116) The response message of the request is the sub-receiver 22 of the sub-device 20 through the transmission bus of the IEEE1394, which is a wired network 40. Is sent to.

The host receiver 12 tunes the broadcast channel of the digital stream signal to the changed broadcast type and channel requested by any sub-device through the tuner 122, and compresses the digital stream compressed from the signal of the tuned broadcast channel through the demodulator 124. Extract the signal. The packet converter 125 converts the compressed digital stream signal into the IEEE 1394 protocol of the transport packet and registers it in the isochronous channel talker for stream transmission in the channel manager 126 to the previously occupied transport channel. The transport packet is transmitted to the sub receiver 22 through the interface 127. (S120) The transport packet is transmitted to the sub receiver 22 of the sub device 20 through the transport bus of IEEE1394, which is a wired network 40. do.

The interface 210 of the sub receiver 22 receives a packet transmitted from the host receiver 12 through a preset channel through an isochronous listener of IEEE1394 and converts the packet to the original compressed digital broadcast stream signal by the packet converter 212. do. The decoder 220 is a digital broadcast stream transmitted from the host receiver 12 through the stream input unit 222, the CA module unit 223, the filter unit 226, the video decoder 224, the audio decoder 228. Decode the signal. The signal converter 240 converts a signal decoded by the video signal converter 242 and the audio signal converter 244 into a video or audio signal, such as a digital TV, a display, a digital amplifier, or the like. )

7 is a flowchart illustrating a channel change and termination method between a host receiver and a sub receiver in a method of operating a home network system according to the present invention. 1 to 7 illustrate a method of receiving and terminating a changed digital broadcast stream when a subchannel receiver requests a channel change during reception from a host receiver in a home network system according to the present invention. At this time, the session establishment of the channel between the host receiver and the sub-receiver is made through asynchronous communication of the IEEE1394 protocol.

First, the host receiver 12 of the home server 10 transmits / receives a digital broadcast stream signal. Accordingly, the video stream, the audio stream, and the program data of the home server 10 are compressed into MPEG-2 through the tuner 122. The broadcast channel is tuned and the compressed digital stream signal is extracted from the tuned broadcast channel signal through the demodulator 124. The decoder unit 128 of the host receiver 12 decodes the compressed digital stream signal, and the signal converter 129 converts the decoded signal into video and audio signals for transmission to the digital television 14. S200)

Although not shown in the drawing, as shown in FIG. 6, the host receiver 12 tunes the broadcast channel of the digital stream signal through the tuner 122 and adjusts the digital stream signal compressed from the signal of the broadcast channel tuned through the demodulator 124. After extracting and converting the compressed digital stream signal through the packet converter 125 into the IEEE1394 protocol of the transport packet, the digital stream signal is transmitted to the sub receiver 22 through the interface 127.

If the sub receiver 22 wants to change the digital stream signal transmitted from the host receiver 12 of the home server 10 through the remote digital television 24 to another broadcast channel, The sub receiver 12 transmits a remote channel request message (RemoteChannelRequest) for requesting a digital stream signal of a broadcast channel to be changed through the interface 210 to the host receiver 12 (S202). It is transmitted to the host receiver 12 of the home server 10 via the transmission bus of the IEEE1394 which is the wired network 40.

The host receiver 12 changes the receive channel of the tuner 122 according to the changed broadcast channel requested in the remote channel request message. The channel resource manager 126 of the host receiver 12 registers the changed broadcast channel by mapping it to an isochronous channel of IEEE1394 and stores the mapping table data (S204).

After the channel of the tuner 122 is changed, the interface 127 of the host receiver 12 transmits a remote channel request success message (RemoteChannelRequestSuccess), which is a response message to the remote channel request, to the sub receiver 22. If the change is unsuccessful, the remote channel request failure message (RemoteChannelRequestFail) is transmitted (S206). The response message of such a request is transmitted to the sub receiver 22 of the sub device 20 through the transmission bus of the IEEE1394 wired network 40. Is sent to.

The host receiver 12 tunes the broadcast channel of the digital stream signal to the change channel requested by any sub device through the tuner 122, and adjusts the digital stream signal compressed from the signal of the tuned broadcast channel through the demodulator 124. Extract. The packet converter 125 changes the compressed digital stream signal to the IEEE1394 protocol of the transport packet, and then transfers the transport packet to the transport channel previously occupied by the channel manager 126 through the interface 127 through the sub receiver 22. To be sent). The transport packet is delivered to the sub receiver 22 of the sub device 20 through the transport bus of the IEEE 1394 which is the wired network 40. The interface 210 of the sub receiver 22 receives a packet transmitted from the host receiver 12 through a preset channel through an isochronous listener of IEEE1394 and converts the packet to the original compressed digital broadcast stream signal by the packet converter 212. do. The decoder 220 is a digital broadcast stream transmitted from the host receiver 12 through the stream input unit 222, the CA module unit 223, the filter unit 226, the video decoder 224, the audio decoder 228. Decode the signal. The signal converter 240 converts a signal decoded by the video signal converter 242 and the audio signal converter 244 into a video or audio signal, such as a digital TV, a display, a digital amplifier, or the like. And outputs the changed channel broadcast.

On the other hand, when the sub receiver 22 of the sub device 20 transmits a remote session termination request message (RemoteSessionCloseRequest) to the end of receiving the digital stream signal to the host receiver 12, the host receiver 12 is the interface 127 The channel resource manager 126 informs the channel resource management unit 126 of the number of isochronous channels in response to the remote session termination request message received, and deletes the mapping table of the broadcast channel and the isochronous channel, and then stops the isochronous channel talker.

The interface 127 of the host receiver 12 transmits a remote session termination success message (RemoteSessionCloseSuccess), which is a response message, to the sub receiver 22 through a transmission bus of IEEE1394, which is a wired network 40 (S214).

The interface 210 of the sub receiver 22 stops the isochronous listener according to the received remote session termination success message (RemoteSessionCloseSuccess) and decodes the digital broadcast stream signal transmitted from the host receiver 12 through the decoder 220. The terminal stops watching or listening to the channel broadcast provided by the home server (S216).

8A to 8C are diagrams illustrating values of a header, an OpCode, and an Operand of an HCMP protocol used for channel connection and change in a home network system of the present invention. The channel change protocol of the home network system of the present invention uses the FCP region of IEEE1394 and defines a structured HCMP to handle channel connection establishment, channel change, and termination of the host receiver and sub-device with the same protocol.

Referring to FIG. 8A, a Home Network Channel Management Protocol (HCMP) 400 used for channel connection and change in the present invention is present on a Function Control Protocol (FCP) of IEC61883. FCP is a protocol proposed for controlling a device connected to a transmission bus of IEEE1394, and bidirectional communication is performed through a transport packet for asynchronous communication of IEEE1394. The frame structure of the FCP is composed of a 4-bit command / transaction set (CTS) 402 and a command / response field (CRF). In the present invention, a vendor unique value of '1110' is used in the CTS code. Accordingly, the 24-bit Company_ID 404 configures the FCP frame added thereto. Accordingly, the HCMP 4000 configures the following FCP frame following the Company_ID 404 field of the FCP.

That is, HCMP includes one byte of HCMP header 406, ten bytes of LID (Listener ID) 408, ten bytes of TID (Talker ID) 410, one byte of OpCode (Operation Code) 412, and two bytes. Operand (414). Here, the HCMP header 406 is one byte indicating that this packet is for HCMP and has a value of '0x99'. The LID 408 is an 80-bit value that contains the GUID (unique value of each IEEE1394 device) value of the 64-bit sub receiver and the listener ID value in the 16-bit sub receiver. The TID 410, like the LID 408, is composed of 80 bits and includes a GUID value of a 64-bit host receiver and a talker ID value in a 16-bit host receiver. Here, the listener ID and the talker ID are IDs for distinguishing a plurality of listeners and talkers existing in the sub receiver and the host receiver, respectively. In addition, the OpCode 412 defines values in advance for various operations such as session request, response, channel change, session termination, and error sent through the HCMP, and the detailed description thereof will be described with reference to FIG. 8B.

Referring to FIG. 8B, various operation message values according to the OpCode value 412 are set. Session setup request message (RemoteSessionRequest) when OpCode value is '0000 0001', session setup setup success message (RemoteSessionSetupSuccess) when '0000 0010', and session setup setup failure message (RemoteSessionSetupFail) when '0000 0011' . If the OpCode value is '0000 0101', the stream request message (RemoteStreamRequest), if '0000 0110' is the stream request success message (RemoteStreamRequestSuccess), and if it is '0000 0111', the stream request failure message (RemoteStreamRequestFail) is set. In addition, if the OpCode value is '0000 1001', the channel request message (RemoteChannelRequest) is set. If the '0000 1010' is set, the channel success message (RemoteChannelRequestSuccess) is set. If the '0000 1011' is set, the channel failure message (RemoteChannelRequestFail) is set. In addition, if the OpCode value is '0001 0001', the session termination request message (RemoteSessionCloseRequest), if '0001 0010', the session termination success message (RemoteSessionCloseSuccess), and if '0001 0011', the session termination failure message (RemoteSessionCloseFail) is set.

Referring to FIG. 8C, the predefined operand 414 values involved for the operation corresponding to the OpCode value 412 are as follows.

If the OpCode value is '0000 0001', the operand for the session setup request message (RemoteSessionRequest) is 0x00 00, and if '0000 0010', the operand for the session setup setup success message (RemoteSessionSetupSuccess) is 0x00 cc and allocates a temporary isochronous channel. If '0000 0011', the operand for the session setup setup failure message (RemoteSessionSetupFail) is set to 0x00 00. If the OpCode value is '0000 0101', the operand for the stream request message (RemoteStreamRequest) is set to 0xcc cc and a broadcast type and a broadcast channel value are transmitted. When the OpCode values are '0000 0110 and' 0000 0111 ', each operand for the stream request success message (RemoteStreamRequestSuccess) and the stream request failure message (RemoteStreamRequestFail) is set to 0x00 00. If the OpCode value is '0000 1001', the operand for the channel request message (RemoteChannelRequest) is 0xcc cc, and the broadcast type and the broadcast channel value are transmitted. In addition, when the OpCode values are '0000 1010' and '0000 1011', the operands for the channel success message (RemoteChannelRequestSuccess) and the channel failure message (RemoteChannelRequestFail) are set to 0x00 00. Also, if the OpCode values are '0001 0001', '0001 0010', and '0001 0011', the operands for the session termination request message (RemoteSessionCloseRequest), session termination success message (RemoteSessionCloseSuccess), and session termination failure message (RemoteSessionCloseFail) are 0x00, respectively. It is set to 00.

Among the 2 byte operand values, the upper 4 bits have a broadcast form and the lower 12 bits have a broadcast channel value. For example, '0001' represents terrestrial, '0010' represents satellite, and '0011' represents cable broadcasting. In addition, by assigning a value of a broadcast channel to the remaining lower 12 bits, a total of 4096 channel values may be represented per one broadcast type.

As described above, the present invention transmits the digital broadcast stream received at the host receiver of the home server to the receiver of the indoor sub-device located at another location far from the receiver, and changes the digital stream channel being received at the request of the sub-device. Enabling this has the effect of extending the viewing and listening services of the home network system.

In addition, the present invention uses the wired network of the home network system as IEEE 1394 as a transmission bus that can guarantee the bandwidth and QoS of the stream. Accordingly, the digital stream broadcast signal is transmitted using the isochronous transmission method of IEEE1394 without any quality deterioration and QoS is guaranteed, and the change of the broadcasting channel is transmitted through the asynchronous transmission method of IEEE1394 to give clarity of data transmission. do. Therefore, in the home network system, it is possible to transmit a high quality digital broadcast stream signal without quality deterioration by ensuring the real-time transmission of the stream between the home server and the sub device.

On the other hand, the present invention is not limited to the above-described embodiment, various modifications are possible by those skilled in the art within the spirit and scope of the present invention described in the claims to be described later.

1 is a diagram illustrating a home network system according to an embodiment of the present invention;

2 is a detailed configuration diagram of a host receiver having a device for transmitting and changing a digital broadcast stream in a home network system according to an embodiment of the present invention;

3 is a detailed configuration diagram of a sub receiver in a home network system according to an embodiment of the present invention;

4A and 4B are diagrams illustrating a structure of a source packet and a header of IEEE1394 of a home network system applied to the present invention;

5 is a CIP header structure diagram of IEEE1394 of a home network system according to the present invention;

6 is a flowchart illustrating a method of transmitting a digital broadcast stream between a host receiver and a sub receiver in a method of operating a home network system according to the present invention;

7 is a flowchart illustrating a method of changing and terminating a channel between a host receiver and a sub receiver in a method of operating a home network system according to the present invention;

8A to 8C are diagrams showing values of a header, an OpCode, and an Operand of an HCMP protocol used for channel connection and change in a home network system of the present invention.

<Description of the code | symbol about the principal part of drawing>

1: home network system 10: home server

12: host receiver 14, 24: digital television

20, 30: Sub device 22, 32: Sub receiver

40 wired network (IEEE1394) 122 tuner

124: demodulator 125, 212: packet conversion unit

126: channel resource management unit 127, 210: interface

128, 220: decoder 129, 240: signal converter

Claims (20)

In a home network system, A home server that receives the digital stream signal and transmits the received or stored digital stream signal; At least one sub device requesting and receiving the digital stream signal from the home server, and decoding and outputting the digital stream signal; Wired network connecting the home server and the sub device Apparatus for transmitting and changing a digital broadcast stream on a home network system comprising a. The method of claim 1, And the home server comprises a digital television and a host receiver connected to the home server. The method according to claim 1 or 2, And the home server transmits the digital broadcast stream signal received from the host receiver or the digital stream signal recorded on the digital television. The method of claim 2, The host receiver includes a tuner for selecting a broadcast channel of the digital stream signal, a demodulator for converting a signal of the broadcast channel selected by the tuner into a compressed digital stream signal, and a packet for changing the compressed digital stream signal into a transport packet. And a converting unit and an interface for transmitting the transport packet. The method of claim 4, wherein And the packet conversion unit allows the transport packet to include the IEEE1394 protocol. The method of claim 4, wherein And the host receiver further comprises a channel resource management unit for storing and managing relationship information between the isochronous channel and the broadcast channel of the IEEE1394. The method of claim 6, The channel resource management unit maps the broadcast type and the broadcast channel with the isochronous channel of the IEEE 1394, and manages and stores the digital broadcast stream on the home network system, characterized in that the table data. The method of claim 4, wherein When the host device requests to receive a digital stream signal of another channel from the sub device, the host receiver changes the channel of the tuner by using the channel change protocol of the IEEE1394. Device. The method of claim 7, wherein And the channel change protocol uses the asynchronous communication scheme of the IEEE1394. The method according to claim 7 or 8, And the channel resource management unit confirms whether to allocate a channel necessary for transmitting a digital stream signal to the IEEE1394 protocol. The method of claim 7, wherein The channel change protocol uses the FCP region of the IEEE1394 and defines a structured HCMP to handle connection establishment, channel change, and termination of connection between the host receiver and the sub device using the same protocol. Apparatus for transmitting broadcast channel and changing channel. The method of claim 4, wherein The host receiver further includes a decoder for decoding the compressed digital stream signal, and a signal converter for converting the decoded signal into a video and audio signal and outputting the video signal to the digital television. Device for transmitting and changing the stream. The method of claim 1, And each sub device comprises a video or audio device and a sub receiver connected to the sub device. The method according to claim 12 or 13, The sub receiver includes an interface for receiving the transport packet, a packet converter for converting the transport packet into a compressed digital stream signal, a decoder for decoding the digital stream signal of the packet converter, and a video or And a signal converter for converting an audio signal and outputting the audio signal to the video or audio device. The method of claim 1, And the wired network is connected to a transmission bus of the IEEE 1394 protocol. A method of operating a home network system having at least one sub device requesting and receiving a digital stream signal from a home server and a wired network connecting the home server and the sub device, the method comprising: Transmitting a request for session establishment from the sub device to the home server; Determining whether a channel allocation for transmitting the digital stream signal from the home server to the sub device is possible; Converting a digital stream signal according to the requested broadcast channel into a transport packet of the wired network protocol by receiving the broadcast channel information requested by the sub device when the channel can be allocated from the home server; Delivering the transformed transport packet to the sub device in the assigned channel at the home server Operating method of a home network system comprising a. A method of operating a home network system having at least one sub device requesting and receiving a digital stream signal from a home server and a wired network connecting the home server and the sub device, the method comprising: Requesting, from the sub device, to change the digital stream signal of any broadcast channel to another broadcast channel to the home server; Determining whether a channel for transmitting the digital stream signal of the other broadcast channel changed by the home server to the sub device is allocated; Converting a digital stream signal of another broadcast channel requested by the sub device into a transport packet of the wired network protocol when the channel is already assigned at the home server; Delivering the transformed transport packet to the sub device in the assigned channel at the home server Operating method of a home network system comprising a. The method according to claim 16 or 17, And the transmission packet includes an IEEE1394 protocol. The method according to claim 16 or 17, And converting and storing relationship information between the isochronous channel and the broadcast channel of the IEEE1394 after converting the packet into a transport packet in the home server. The method of claim 17, When the sub device requests another broadcast channel, the home server changes the broadcast channel using a channel change protocol of IEEE1394.