KR100191309B1 - The signal processing apparatus for high definition television - Google Patents

Abstract

The present invention relates to a signal processing for a high definition television (HDTV) for processing a video signal of a high definition television (HDTV) in real time. The present invention divides the video signal into a plurality of areas so as to fit the frame format of the HDTV into a low level frame format such as MP @ ML of MPEG II, and uses the encoder and decoder of the MP @ ML specification in the video signal in each area. It can be processed independently, and reconstructed the processed video signal for each area to fit the HDTV frame format.

Description

Signal Processing Device for High Definition Television

1 is a diagram showing a screen of an HDTV video signal divided into four areas based on the frame format of MP @ ML of MPEG II.

2 is a block diagram showing a signal processing apparatus for HDTV at the transmission side according to a preferred embodiment of the present invention.

3 is a block diagram showing a signal processing apparatus for HDTV at the receiving side according to a preferred embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

21: region divider 22: MP @ ML image encoder

27: voice encoder 28: TS encoder

31: TS decoder 36: voice decoder

37: audio output unit 38: speaker

39: MP @ ML video decoder 44: reconstruction unit

45: receiver

The present invention relates to a signal processing apparatus for high-definition television (HDTV), and more particularly, by using a plurality of encoders and decoders of MP @ ML (Main Profile @ Main Level) of MPEG II. The present invention relates to a signal processing apparatus for high-definition television (HDTV) that enables signal processing in real time.

MPEG II is adopted as the compression algorithm for digital satellite broadcasting, digital cable TV and HDTV. In particular, MPEG II presents MP @ HL (Main Profile, High Level) or SSP @ H1440 (Spatial Scalable Profile, High 1440 Level) as the standard for HDTV. Here, MPEG II defines five profiles and four levels according to function and resolution. On the other hand, the HDTV has a frame format of 1440 (horizontal pixels) x 960 (vertical pixels) as shown in FIG. When processing the HDTV video signal of the frame format in the manner presented in MPEG II, a large amount of computation and time are required, and the system is complicated. In addition, there is difficulty in real time processing.

Accordingly, an object of the present invention is to divide the HDTV video signal into a plurality of areas so as to meet the frame format defined in MP @ ML, which is a level lower than that of MPEG II, to solve the above problems. The present invention provides a signal processing apparatus for high-definition television (HDTV) capable of encoding and decoding the MP @ ML encoder and decoder in real time.

In order to achieve the above object, a signal processing apparatus for a high definition television (HDTV) according to the present invention comprises: encoding the frame unit video signal of the HDTV into a plurality of areas and encoding the video signals in each divided area independently. Means, and decoding means for independently decoding a video signal in each region encoded by the encoding means, and reconstructing the video signal in each decoded region into a frame unit video signal of the HDTV.

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

FIG. 1 is a diagram showing a screen of an HDTV video signal divided into four areas based on the frame format of MP @ ML of MPEG II. As shown, the video signal of an HDTV having a frame format of 1440 (horizontal pixels) x 960 (vertical pixels) is converted according to the frame format of 720 (horizontal pixels) x 480 (vertical pixels) defined in MP @ ML of MPEG II. It is divided into four areas. The video signals in each region are independently encoded using four encoders of the MPEG II MP @ ML specification. The hardware configuration for this is shown in FIG.

2 is a block diagram showing a signal processing apparatus for an HDTV in the transmission side according to the present invention. As shown in the drawing, the apparatus of the present invention converts a video signal in a frame unit of an HDTV into a frame unit of an MP @ ML specification of MPEG II. A region divider 21 for dividing an area, and an MP @ ML image encoder 22 including a plurality of MP @ ML image encoders 23 to 26 for encoding video signals in each divided region according to its specification. Equipped. The apparatus of the present invention also includes a voice encoder 27 for encoding a voice signal corresponding to the video signal in units of frames of the HDTV. Between the MP @ ML video encoders 23 to 26 and the audio encoder 27 in the MP @ ML video encoder unit 22, the encoded video signals (Video PES1 to Video PES4) and audio signals (Audio) for each area are recorded. The TS encoder 28 which transmits the TS bit string by encoding PES in the form of TS (Transport Stream) is connected.

The operation of the signal processing apparatus for the HDTV in the transmission side according to the present invention configured as described above will be described in more detail.

First, the area divider 21 receives an HDTV video signal having a frame size of 1440 (horizontal pixel) x 960 (vertical pixel) as shown in FIG. 1, and the HDTV video signal is based on the frame format of MP @ ML of MPEG II. By dividing the image into 720 (horizontal pixel) x 480 (vertical pixel) size units. Here, one frame video signal of the HDTV is divided into four regions according to the frame format of MP @ ML. Four areas are input to the corresponding MP @ ML image encoders 23 to 26 in the MP @ ML image encoder unit 22. The four MP @ ML image encoders 23 to 26 in the MP @ ML image encoder unit 22 receive an image signal of a corresponding region among the four divided regions and encode the image signal according to the MP @ ML specification. Then, the MP @ ML video encoders 23 to 26 output the encoded video signal by packetizing elementary stream (PES) packets according to a prescribed syntax. On the other hand, the audio signal corresponding to the HDTV video signal of the frame unit input to the area divider 21 is input to the voice encoder 27. The voice encoder 27 encodes the input HDTV audio signal in accordance with MP @ ML phase, and outputs the encoded voice signal by PES packetization according to a prescribed syntax. Four video packets (Video PES1 to Video PES4) output from the MP @ ML video encoders 23 to 26 and audio PES output from the audio encoder 27 are input to the TS encoder 28. The TS encoder 28 encodes four video packets (Video PES1 to Video PES4) and audio packets (Audio PES) for each input area in the form of TS packets to transmit a TS bit string. In this case, TS (Transport Stream) is mainly used when a bit string is transmitted through a medium in which an error is likely to occur, and a fixed packet size is used to add parity information for error correction. This packet size is set to 188 bytes, which is composed of a header part of 4 bytes and a payload part of 184 bytes.

On the other hand, HDTV video and audio signals are made of one audio PES packet and four video PES packets, and each PES packet is provided with a unique PID (Packet ID) in the TS encoder 28, and is mixed in time and transmitted. In other words, each header in each of the four packets for the video signal and one packet for the audio signal has its own PID. By using this PID, the receiver can know what kind of bit string is included in the payload of the packet. Will be. In other words, the PID is equal to the unique address of each packet. FIG. 3 illustrates an apparatus for receiving and processing a TS bit string arranged as described above, reconstructing a video signal conforming to an HDTV frame format, and outputting a corresponding audio signal.

3 is a block diagram showing a signal processing apparatus for HDTV at the receiving side according to the present invention. As shown, the apparatus of the present invention includes a TS decoder section 31 composed of four TS decoders 32 to 35 for separating and outputting four video packets as well as an audio packet from a received TS bit string. have. The four TS decoders 32 to 35 receive a decoded bit string of the audio packet, decode the decoded audio signal, and output a decoded audio signal. The decoded video signal receives the decoded bit string of each video packet. Four MP @ ML video decoders 40 to 43 which output the MP @ ML video decoders 39 are connected correspondingly. The voice decoder 36 is connected to a voice output unit 37 for transmitting the restored voice signal to the speaker 38 so that a user can hear it. The four MP @ ML video decoders 40 to 43 are configured to be connected to a reconstructing unit 44 which reconstructs the four restored video signals to be displayed on the receiver 45 of the HDTV.

The operation of the signal processing apparatus for the HDTV at the receiving side according to the present invention configured as described above will be described in more detail.

First, the TS bit string received through the antenna is input to the TS decoder 31. The TS decoder 31 detects only the PID corresponding to the encoded video signal for each of the four areas obtained by dividing the HDTV video signal and the inherent PID given to the audio signal on the transmission side, and the MP @ ML video decoder 39 and the audio. The TS bit string is input to four TS decoders 32 to 35 for supplying the bit string to the decoder 36. The TS decoder 32 finds a packet (Audio PES, Video PES1) having an audio PID of one of the input TS bit strings and a video PID encoding the first region in FIG. The bit string is output to the audio decoder 36, and the bit string of the video packet Video PES1 for the first region is output to the corresponding MP @ ML video decoder 40 in the MP @ ML video decoder unit 39. . The TS decoder 33 finds a video packet (Video PES2) having a video PID having encoded the second region in FIG. 1 of the input TS bit streams, and sends the bit streams to the corresponding MP @ ML video decoders 41. FIG. Output The TS decoder 34 finds a packet Video PES3 having an image PID encoding the third region in FIG. 1 of the input TS bit strings, and outputs the bit string to the corresponding MP @ ML video decoder 42. . The TS decoder 35 finds a packet Video PES4 having the video PID encoding the fourth region in FIG. 1 of the input TS bit stream, and outputs the bit stream to the corresponding MP @ ML video decoder 43. . The voice decoder 36 decodes the voice bit string applied from the TS decoder 32 to restore the voice signal. The voice output unit 37 transmits the restored voice signal through the speaker 38. The MP @ ML video decoder 39 uses the MP @ ML video decoders 40 to 43 to independently decode and reconstruct the video bit stream for each region input according to the MPEG II MP @ ML specification. That is, the MP @ ML video decoder 40 receives a bit string of the encoded video packet Video PES1 in the first area detected by the TS decoder 32, decodes the bit stream, and outputs a reconstructed video signal. The MP @ ML video decoder 41 receives a bit string of the encoded video packet Video PES2 in the second area detected by the TS decoder 33, decodes the bit stream, and outputs a reconstructed video signal. The MP @ ML video decoder 42 receives a bit string of an encoded video packet Video PES3 in the third region detected by the TS decoder 34, decodes the bit stream, and outputs a reconstructed video signal. The MP @ ML video decoder 43 receives a bit string of the encoded video packet Video PES4 in the fourth region, decodes it, and outputs a reconstructed video signal. The four video signals decoded and reconstructed by the MP @ ML video decoders 40 to 43, respectively, are inputted to the reconstructor 44 and displayed on the receiver 45 of the HDTV. Is reconstructed.

Here, a frame format defined in profiles and levels other than MP @ ML may be used.

As described above, the present invention relates to a signal processing apparatus for high-definition television (HDTV), wherein the video signal is divided into four areas according to the frame format of the HDTV frame format of MP @ ML of MPEG II, and each divided The video signal in the area is processed independently and then reconstructed into a form that can be displayed on the HDTV receiver. Thus, the HDTV signal can be processed in real time.

Claims (4)

A signal processing apparatus for a high definition television (HDTV), comprising: encoding means for dividing a frame unit video signal of the HDTV into a plurality of areas and independently encoding the video signals in each divided area; And decoding means for independently decoding the video signal in each region encoded by the encoding means, and reconstructing the video signal in each decoded region into the frame unit video signal of the HDTV. The method of claim 1, wherein the encoding means divides the HDTV video signal in units of frames according to a lower level standard than the HDTV standard set forth in MPEG II, and adjusts the video signals in the divided areas according to the standard. Signal processing apparatus for HDTV, characterized in that for encoding. 3. The apparatus of claim 2, wherein the encoding means comprises: an area divider for dividing an input HDTV video signal in units of frames according to a frame format of MP @ ML of MPEG II; A plurality of MP @ ML images which are encoded by region according to the specification of MP @ ML of MPEG II by encoding the image signals in each region divided by the region divider, and giving a unique PID to the region encoded image signals. An MP @ ML image encoder unit having an encoder; A voice encoder for encoding, packetizing, and outputting a voice signal corresponding to an HDTV video signal of a frame unit input to the area divider; And a TS encoder for multiplexing the voice packet of the voice encoder and the video packet for each region of the MP @ ML image encoder unit in a TS bit sequence. 4. The apparatus of claim 3, wherein the decoding unit comprises: a TS decoder for separating and outputting an audio packet and an image packet for each region by using PIDs of respective packets in a received TS bit sequence; A voice decoder configured to receive a bit string of the voice packet separated by the TS decoder and to decode and output a reconstructed voice signal; A reconstructed video signal corresponding to the frame format of MP @ ML is provided with a plurality of MP @ ML video decoders, and receives and decodes the bit strings of the video packets for each region separated from the TS decoder by a corresponding MP @ ML video decoder. MP @ ML image decoder unit for outputting; And a reconstruction unit for reconstructing the reconstructed video signals corresponding to the frame formats of the plurality of MP @ MLs reconstructed in the MP @ ML video decoder unit into video signals corresponding to the frame format of the HDTV. Processing unit.