KR20060010347A - Wireless video transmit apparatus - Google Patents

Abstract

An object of the present invention is to provide a wireless video transmission apparatus capable of obtaining satisfactory image quality within a limited bandwidth of a wireless transmission channel by selecting and transmitting only a transport stream of a desired program from a transport stream in which a plurality of broadcast programs exist. The wireless image transmitting apparatus includes a digital tuner that transmits a digital broadcast signal of a predetermined band, digitally converts and decodes the received digital broadcast signal, and outputs a transport stream according to a standard, and a transport output from the digital tuner. A program selector that receives streams and extracts only transport streams corresponding to one or more selected programs and converts the PES packets into PES packets, and controls a program selection process of the program selector according to a user's selection and outputs from the program selector And a WLAN card for converting the PES packet into a communication packet according to a communication standard and outputting the wireless packet, and a WLAN card for transmitting the communication packet output from the MCU as a wireless signal of a predetermined band. WLAN card that extracts the communication packet loaded on the corresponding signal, MCU which receives the communication packet outputted from the WLAN card and restores the PES packet, and receives the PES packet outputted from the MCU, And a program selector for restoring and transferring the video / video data of the selected program from the restored transport stream to a predetermined video apparatus.

Digital TV, MPEG, program stream, paketized elementary stream, transport stream,

Description

Wireless video transmit apparatus

1 is a block diagram showing the configuration of a conventional wireless video transmission device.

2 is a block diagram showing the configuration of a wireless video transmission device according to the present invention.

3 is a block diagram showing an example of the configuration of a program selector in the apparatus for transmitting wireless video according to the present invention.

4 is a block diagram showing the structure of an MPEG-2 transport stream.

5 is a block diagram showing a relationship between an MPEG-2 transport stream, a PS packet, and a PES packet.

* Description of the symbols for the main parts of the drawings *

21: transmitter 22: receiver

23: digital tuner 24,30: program selector

25,29: MCU 26,28: WLAN card

27, 31: remote control receiver

The present invention relates to a wireless video transmission apparatus capable of wirelessly transmitting an audio / video signal in a video electronic period. More particularly, the wireless video transmission apparatus may select and transmit some programs from a transport stream in which a plurality of broadcast programs exist. It relates to a transmission device.

In recent years, with the rapid increase in the demand for digital television due to the development of digital technology, the user's demand for a method that can solve various wires that are easy to install and complicated.

[0003] In general, video home appliances that are used include, in addition to digital television (HDTV), a set-top box for receiving broadcast programs (for example, satellite broadcasting, cable broadcasting, etc.) different from terrestrial broadcasting. Video / audio signals for a broadcast program on a storage medium (e.g. DVD, video cassette, etc.) or a record / player that can read and play back the video / audio signals stored in the storage medium as a TV signal. For example, these various video devices operate while exchanging video / audio signals with each other.

The video / audio signal exchange between these various video devices was first performed through a cable, but as described above, as the number of cables required increases, the cable may be damaged due to complicated cables during installation or connection. In order to solve the problem of the cable, a wireless video transmission device has been proposed to exchange video and audio signals through a wireless signal.

1 is a block diagram showing a configuration of a conventionally proposed wireless video transmission apparatus, wherein the apparatus is a transport of a digital broadcast received and installed on the side (eg, set-top box, digital television, etc.) for transmitting a video signal. It is installed on the transmitter 11 for transmitting the stream as a radio signal and on the side for receiving the video signal (for example, digital television, DVD player, etc.) and receives the radio signal transmitted from the transmitter 11, and then transports it. And a receiver 12 for demodulating the stream.

The transmitter 11 receives a digital broadcast signal transmitted through a predetermined wireless channel and demodulates and outputs a transport stream, and the transport stream output from the tuner 13 according to a wireless LAN standard. MCU 14 converts and outputs a communication packet, and a WLAN card 15 transmitting a communication packet output from the MCU 14 to a set WLAN channel.

The receiving unit 12 receives a wireless signal transmitted from the transmitting unit 11, removes a carrier wave, outputs a transmitted communication packet, and a communication packet output from the WLAN card 16. And an MPEG decoder 18 for selecting and outputting a transport stream carrying audio / video signals of a selected program from among the transport streams output from the MCU 17 and the MCU 17 for converting into a transport stream. )

However, the conventional wireless image transmitting apparatus converts a transport stream including image data and audio data of all broadcast programs received by a digital tuner into a WLAN channel signal and transmits the same, as received by the receiving unit 12 and selected from among them. It extracts the video / audio signal of the program and delivers it to the video device (TV, DVD player, etc.).

That is, since other programs besides the last selected program are transmitted in the WLAN band having the limited bandwidth, the amount of transmission is increased in the limited bandwidth, and as a result, satisfactory image quality can be obtained from the video device to which the receiver 12 is connected. There was a problem that the unit price was high.

SUMMARY OF THE INVENTION The present invention has been proposed to solve the above-described problems, and its object is to satisfy a limited bandwidth of a wireless transmission channel by selecting and transmitting only a transport stream of a desired program from a transport stream in which a plurality of broadcast programs exist. It is to provide a wireless video transmission device that can obtain a picture quality.

According to an aspect of the present invention, there is provided a wireless video transmission apparatus for transmitting video and audio data as a wireless signal in two different video image periods.

A digital tuner that receives a digital broadcast signal of a predetermined band, digitally converts and decodes the received digital broadcast signal, and outputs a transport stream according to a standard, and receives one or more selected programs by receiving the transport streams output from the digital tuner. A program selector for extracting only the transport stream corresponding to the PES packet and controlling the program selection process of the program selector according to a user's selection, and converting the PES packet outputted from the program selector into a communication packet according to a communication standard A transmitter including a microcontroller (MCU) for outputting and a WLAN card for transmitting a communication packet output from the MCU as a wireless signal of a predetermined band; And

Receives a wireless signal of a predetermined band and extracts a communication packet loaded on the signal, a WLAN card receiving the communication packet output from the WLAN card to restore the PES packet, and receives the PES packet output from the MCU And a receiving unit including a program selector for restoring a transport stream of an image standard and transferring the video / video data of a selected program among the restored transport streams to a predetermined video device.

According to another aspect of the present invention, there is provided a wireless video transmission apparatus for transmitting video and audio data as a wireless signal in a video device for receiving a broadcast signal and a video and video storage device.

A digital tuner that receives a digital broadcast signal of a predetermined band, digitally converts and decodes the received digital broadcast signal, and outputs a transport stream according to a standard, and receives one or more selected programs by receiving the transport streams output from the digital tuner. A program selector for extracting only the transport stream corresponding to the PES packet and controlling the program selection process of the program selector according to a user's selection, and converting the PES packet output from the program selector into a communication packet according to a communication standard A transmitter including a microcontroller (MCU) for outputting and a WLAN card for transmitting a communication packet output from the MCU as a wireless signal of a predetermined band; And

Receives a wireless signal of a predetermined band and extracts a communication packet loaded on the signal and a communication packet outputted from the WLAN card to recover the PES packet, and then multiplex the PES packet to form a PS packet Provided is a wireless image transmission device including a receiver including an MCU for outputting to a storage image device.

In the wireless image transmission device of the present invention, the transmitter or the receiver may further include a remote control signal receiver for receiving the program selection signal of the remote control to transmit to the MCU.

In addition, the wireless image transmission device of the present invention, the program selector of the transmitter, the input buffer for sequentially receiving and storing the transport stream output from the digital tuner; A demultiplexer extracting a payload region from the transport stream sequentially output through the input buffer and distributing the program by program; And a plurality of output buffers connected to an output of the demultiplexer and sequentially storing data of a payload region output from the demultiplexer for each program, and outputting data of a corresponding program according to a program selection signal.

In addition, the wireless image transmission device of the present invention, the program selector of the receiving unit, the input buffer for sequentially receiving and storing the PES packet output from the MCU and sequentially output; A demultiplexer extracting a payload region from the PES packets sequentially output through the input buffer and distributing the program by program; And a plurality of output buffers connected to an output of the demultiplexer and sequentially storing data of a payload region output from the demultiplexer for each program, and outputting data of a corresponding program according to a program selection signal.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the wireless image transmission apparatus according to the present invention.

2 is a block diagram showing an embodiment of a wireless video transmission device according to the present invention.

Referring to FIG. 2, the wireless image transmission device of the present invention receives a digital broadcast signal of a predetermined band, digitally converts and decodes the received digital broadcast signal, and outputs a transport stream according to a standard. And a program selector 24 which receives the transport streams output from the digital tuner 23, extracts only the transport streams corresponding to one or more selected programs, and converts the transport streams into PES packets. The MCU 25 which controls the program selection process of the selector 24 and converts the PES packet output from the program selector 24 into a communication packet according to a communication standard and outputs the communication packet output from the MCU, and a predetermined band. A transmission unit 21 including a WLAN card 26 for transmitting a wireless signal of the wireless communication system; And a WLAN card 28 for receiving a radio signal of a predetermined band and extracting a communication packet loaded on the corresponding signal, and an MCU 29 for receiving a communication packet output from the WLAN card 28 and restoring the PES packet. The program selector 30 receives the PES packet outputted from the MCU 29 to restore a transport stream of an image standard, and transfers video / video data of a selected program among the restored transport streams to a predetermined video device. It consists of a receiving unit 22 comprising a.

In addition, the transmitter 21 or the receiver 22 may further include remote controller signal receivers 27 and 31 for receiving a program selection signal of the remote controller and transmitting the signal to the MCU.

2 is a configuration according to the first embodiment of the present invention, in which the receiver 22 is connected to a digital TV.

As a second embodiment of the present invention, the receiver 22 may be made up of only the WLAN card 28 and the MCU 29 without the program selector 30.

The operation of the wireless imaging device shown in FIG. 2 may be performed as follows.

First, the digital tuner 23 receives a digital broadcast signal transmitted through various paths such as airwaves or a cable or satellite signal, and performs digital conversion and decoding on the transport stream according to the MPEG-2 protocol. To be printed). The TS is a protocol for transmitting video, audio, and data in one stream at the same time in an MPEG-2 system. The TS is composed of one or more programs, and the header includes program information constituting the entire stream and time information of the program. And control information for controlling the entire system. 4 shows a general structure of a TS packet. A TS packet includes a header in which information is written, an adaptation field, and a payload region in which video / audio data of a plurality of programs are actually loaded. The total size consists of 188 bytes.

At this time, the header portion of the TS packet includes synchronization information, transmission error identification information, payload start position, priority, PID, scramble information, adaptive field control information, and continuous value. In particular, the PID information is information about a program carried in a payload region. By extracting and analyzing the program, it is possible to know what programs are transmitted in a corresponding TS packet.

The TS packet configured as described above is transferred from the digital tuner 23 to the program selector 24.

The program selector 24 extracts only video and audio data of the selected program from the input TS packet and converts the converted video into a packetized elementary stream (PES) packet.

The PES is a packetized stream in which header information is added to transmit an elementary stream (ES) obtained by digitally compressing a video or audio signal in MPEG. Usually, the PES is one frame image information, and the header information is ES content. It is used for decoding at the receiving side because it contains various information about. For example, information such as video format, color format, coding method, aspect ratio, etc. Included.

Accordingly, the program selector 24 extracts information of the payload region from the TS input from the digital tuner 23, forms a PES packet for each program by referring to PID information of the header region, and then selects the selected program. Output a PES packet. An embodiment of such a program selector 24 is described in more detail below.

As described above, the PES packets of the selected programs output from the program selector 24 are delivered to the MCU 25, packetized by the MCU 25 into a communication packet according to a communication standard, and then to the WLAN card 26. Is approved. The MCU 25 controls the program selection in the program selector 24, and outputs the video / audio data of the selected program according to the program selection signal of the user input through the remote controller signal receiver 27. .

The communication packet in which the video / audio data of the selected program is packetized as described above is inputted to the WLAN card 26 and is wirelessly transmitted on a carrier of the set band and received by the WLAN card 28 of the receiver 22.

The WLAN card 28 of the receiver 22, in contrast to the WLAN card 26 of the transmitter 21, filters and signals the received radio signal, restores the packet on the carrier, and outputs the packet to the MCU 29.

At this time, the MCU 29 converts the input communication packet into a PES packet and applies it to the program selector 30. The program selector 30 divides each video and audio data of the PES packet according to a program and recreates a TS packet. After the configuration, and output to the video device (for example, digital TV) connected to the output terminal.

In another embodiment of the present invention, the wireless video transmission device may form the transmitted video and audio data into a PS (Program Stream) packet and provide the same to a DVD player.

In this case, the MCU 29 of FIG. 2 converts the input communication packet back into a PES packet and collects video and audio data from the PES packet to form a PS packet. In this case, the program selector 30 is provided. Instead, the PS 29 can directly output the PS packet from the MCU 29 to the DVD player.

The PS packet is a data transmission type applied to an environment in which errors and losses of data are relatively small, such as a CD-ROM proposed in MPEG 2. The PS packet is made by variable-length multiplexing with PES. Looking at the structure of the PS, it can be divided into a pack layer which is an upper layer and a packet layer of a lower layer. In the pack layer, several packets are collected and organized into packs, which are treated as basic units, so that decoding can be performed even during the transmission flow. A pack consists of a pack header, packets, and an end code. A packet consists of packet start data, a control data area, and data.

FIG. 5 schematically illustrates the relationship between the above-described TS packet, PES packet, and PS packet. A PES packet is formed by collecting video and audio data contained in a payload area of a TS packet for each program. A packet is formed.

Next, FIG. 3 is a block diagram showing an embodiment of the program selectors 24 and 30 provided in the transmitter 21 and the receiver 22. Referring to this, the program selector includes: an input buffer 32; The demultiplexer 33 and a plurality of output buffers 34 to 36 are included.

In the above, the input buffer 32 receives the TS from the digital tuner 23 or receives the PES packet from the MCU 29 and sequentially stores the same, and outputs them sequentially at predetermined time intervals.

Packets sequentially output from the input buffer 32 are input to the demultiplexer 33. The demultiplexer 33 extracts video / audio data of a payload region included in the input packet and distributes the program-specific data. In this case, the program information may be obtained by referring to the PID information of the TS.

The video / audio data output from the demultiplexer 33 is classified for each program and stored in each of the plurality of output buffers 34 to 36. For example, the output buffer 34 stores video / audio data of the first program in order, the output buffer 35 stores video / audio data of the second program in order, and the output buffer 36 The video / audio data of the third program is stored in order.

The plurality of output buffers 34 to 36 output the stored video and audio data by operating the output buffers 34 to 36 storing the corresponding program according to a program selection signal applied from the MCU 25 or 29. At this time, when provided in the program selector 24 of the transmitter 21, it is output as a PES packet, and when provided in the program selector 30 of the receiver 22, it is output as a TS packet.

In the above, the demultiplexer 33 performs parsing along with the distribution of the program video / audio data.

The wireless video transmission device configured as described above connects the transmitter 21 to a set-top box or a digital TV, and connects the receiver 22 to a digital TV or a DVD player, and between the set-top box and the digital TV or between the digital TV and the DVD player. Video and audio signals can be delivered, played or stored without the need for complicated cables.

As described above, the present invention extracts and transmits only video and audio data for a program required for wirelessly transmitting video and audio data of a digital broadcast, and efficiently utilizes limited bandwidth to provide high quality digital video / audio. There is an excellent effect of enabling signal transmission.

Claims (5)

In the wireless video transmission device for transmitting the video and audio data as a wireless signal in two different video camera periods, A digital tuner that receives a digital broadcast signal of a predetermined band, digitally converts and decodes the received digital broadcast signal, and outputs a transport stream according to a standard, and receives one or more selected programs by receiving the transport streams output from the digital tuner. A program selector for extracting only the transport stream corresponding to the PES packet and controlling the program selection process of the program selector according to a user's selection, and converting the PES packet outputted from the program selector into a communication packet according to a communication standard A transmitter including a microcontroller (MCU) for outputting and a WLAN card for transmitting a communication packet output from the MCU as a wireless signal of a predetermined band; And Receives a wireless signal of a predetermined band and extracts a communication packet loaded on the signal, a WLAN card receiving the communication packet output from the WLAN card to restore the PES packet, and receives the PES packet output from the MCU And a receiving unit including a program selector for restoring a transport stream of an image standard and transferring image / video data of a program selected from the restored transport stream to a predetermined video device. A wireless video transmission device for transmitting video and audio data as a wireless signal during a video device for receiving broadcast signals and a video and audio storage device, A digital tuner that receives a digital broadcast signal of a predetermined band, digitally converts and decodes the received digital broadcast signal, and outputs a transport stream according to a standard, and receives one or more selected programs by receiving the transport streams output from the digital tuner. A program selector for extracting only the transport stream corresponding to the PES packet and controlling the program selection process of the program selector according to a user's selection, and converting the PES packet outputted from the program selector into a communication packet according to a communication standard A transmitter including a microcontroller (MCU) for outputting and a WLAN card for transmitting a communication packet output from the MCU as a wireless signal of a predetermined band; And Receives a wireless signal of a predetermined band and extracts a communication packet loaded on the signal and a communication packet outputted from the WLAN card to recover the PES packet, and then multiplex the PES packet to form a PS packet Wireless image transmission device consisting of a receiving unit including an MCU for outputting to a video device for storage. The device of claim 1 or 2, wherein the device is And a remote control signal receiver which receives a program selection signal of a remote controller and transmits the program selection signal to a MCU. The program selector of claim 1 or 2, wherein An input buffer which sequentially receives the transport streams output from the digital tuner, stores them, and outputs them in order; A demultiplexer extracting a payload region from the transport stream sequentially output through the input buffer and distributing the program by program; And A plurality of output buffers connected to an output of the demultiplexer and sequentially storing data of a payload region output from the demultiplexer for each program and outputting data of a corresponding program according to a program selection signal. Video transmission device. 5. The program selector of claim 4, wherein the program selector of the receiver is An input buffer for sequentially receiving and storing PES packets output from the MCU and sequentially outputting the PES packets; A demultiplexer extracting a payload region from the PES packets sequentially output through the input buffer and distributing the program by program; And A plurality of output buffers connected to an output of the demultiplexer and sequentially storing data of a payload region output from the demultiplexer for each program and outputting data of a corresponding program according to a program selection signal. Video transmission device.

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