KR100301017B1 - Detecting method of digital TV signal status & digital TV decoding apparatus using the method - Google Patents

Abstract

The present invention relates to a digital TV signal state detection method and a digital TV decoding apparatus employing the same, comprising: 1) checking a data error rate from a received digital TV signal; 2) determining whether there is an abnormal state of a signal by applying a predetermined criterion to the error rate test result; And 3) retrying channel tuning of the digital TV signal if there is an abnormality in the signal state.

Description

Detecting method of digital TV signal status & digital TV decoding apparatus using the method}

The present invention relates to a digital TV, and more particularly, to a digital TV signal state detection method for checking whether a received digital signal is decoded correctly and automatically adjusting channel tuning according to the decoding state, and a digital TV decoding apparatus employing the same. It is about.

Conventionally, there has been a method of tuning a channel by inspecting a digital and / or analog signal received by a TV, but a determination as to whether or not the received signal is properly decoded and displayed on a screen has not been performed and the corresponding control operation is not made.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a digital TV signal state detection method and a digital TV decoding apparatus employing the same, wherein the decoding error rate is checked when the digital TV signal is decoded, and channel tuning is performed again when the error rate is high.

1 is a flowchart of a digital TV signal state detection method of the present invention.

2 is a block diagram for explaining a digital TV signal decoding apparatus of the present invention.

<Explanation of symbols for the main parts of the drawings>

200 ... Transmit Demultiplexer 210 ... Video Decoder

211 ... flag 220 ... tuning part

230 ... decoding control

In order to solve the above problems, a digital TV signal state detection method includes: 1) checking a data error rate from a received digital TV signal; 2) applying a predetermined criterion to the error rate test result to determine whether there is an abnormal state of a signal state; And 3) retrying channel tuning of the digital TV signal if the signal condition is abnormal.

In step 1), it is preferable to check information for error determination included in the digital TV signal.

Preferably, the information for error determination is CRC information included in the digital TV signal.

The information for determining the error is preferably related to the omission of each frame of the video signal.

The information for determining the error is preferably information about whether each frame of the video signal and CRC information included in the digital TV signal is missing.

In order to solve the above problems, a digital TV signal decoding apparatus converts a transport stream of a received digital TV signal into a video packetized elementary stream (Video PES) and adjusts a data error rate of the digital TV signal. A transmission demultiplexer to check; A video decoder which receives the video packetized elementary stream and converts the data into R, G, and B signals, and detects data errors by determining whether to decode each video frame; A tuning unit for tuning a channel; And a decoding control unit configured to determine whether there is an abnormality of the digital TV signal by applying a predetermined criterion to the error detected by the demultiplexer and the video decoder, and to control the tuning unit to better fit the channel when there is an abnormality. .

Preferably, the demultiplexer detects a CRC error by checking a cyclic redundancy check (CRC) included in the received digital TV signal.

The video decoder preferably has a flag that is set or reset depending on whether each frame of the video signal has been decoded.

The decoding control unit preferably checks the flag to determine whether to decode each frame of the video signal therefrom, and recognizes a predetermined frame decoding drop rate as a decoding error rate.

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

1 is a flowchart of a digital TV signal state detection method of the present invention. First, a data error rate is checked from a received digital TV signal (step 100). This is done by examining the information for error determination included in the digital TV signal. The information for error determination may be CRC information included in the digital TV signal or information about whether each frame of the video signal is missing or CRC information included in the digital TV signal and information about whether each frame of the video signal is missing. . A predetermined criterion is applied to the error rate test result of step 100 to determine whether there is an abnormal signal state (step 110). If there is an error in the decoded signal state, channel tuning of the digital TV signal is performed again (step 120).

FIG. 2 is a block diagram illustrating a digital TV signal decoding apparatus of the present invention. The digital TV signal decoding apparatus includes a transmission demultiplexer 200, a video decoder 210, a tuning unit 220, and a decoding control unit 230. Equipped. The transport demultiplexer 200 converts the transport stream into a video packetized elementary stream (Video PES), and checks the data error rate included in the digital TV signal. That is, the CRC error rate is detected by checking a cyclic redundancy check (CRC) included in the received digital TV signal. The video decoder 210 receives a video packetized elementary stream and processes the data into an R, G, or B signal, and detects a data error by determining whether to decode each frame of the video signal. Data error detection of the video decoder 210 is accomplished by writing a flag 211 value for missing frame decoding, with a flag 211 set or reset depending on whether each frame of the video signal has been decoded. . The tuning unit 220 performs an adjustment for adjusting the channel frequency. The decoding controller 230 determines whether there is an abnormality in the digital TV signal by applying a predetermined criterion to the error detected by the transmission demultiplexer 200 and the video decoder 210, and operates the tuning unit 220 when there is an error. Allow channel tuning to occur again. The decoding controller 130 checks a flag 211 relating to whether or not the video decoder 210 decodes the frame, determines whether to decode each frame of the video signal therefrom, and recognizes a predetermined frame decoding missing rate as a decoding error rate. do.

According to the present invention, it is possible to take a predetermined measure corresponding to a decoding error such as retrying channel tuning by checking whether a decoding error is detected while decoding a digital TV signal.

Claims (9)

1) checking the data error rate from the received digital signal; 2) applying a predetermined criterion to the error rate test result to determine whether there is an abnormal state of a signal; And 3) retrying channel tuning of the digital signal if the signal state is abnormal. The method of claim 1, wherein step 1) comprises: And detecting information for error determination included in the digital signal. The method of claim 2, wherein the information for determining the error is And digital cyclic redundancy check (CRC) information included in the digital signal. The method of claim 2, wherein the information for determining the error is Digital signal state detection method characterized in that each frame of the video signal missing. The method of claim 2, wherein the information for determining the error is And CRC information included in the digital signal and information on whether each frame of the video signal is missing. A transmission demultiplexer for converting a transport stream of the received digital signal into a video packetized elementary stream (Video PES) and checking a data error rate of the digital signal; A video decoder which receives the video packetized elementary stream and converts the data into R, G, and B signals, and detects data errors by determining whether to decode each video frame; A tuning unit for tuning a channel; And And a decoding control unit configured to determine whether there is an abnormality of the digital signal by applying a predetermined criterion to the error detected by the demultiplexer and the video decoder, and to control the tuning unit to better fit the channel when there is an error. Digital signal decoding apparatus. The method of claim 6, wherein the demultiplexer, And detecting an error by checking a cyclic redundancy check (CRC) included in the received digital signal. The method of claim 6, wherein the video decoder, And a flag that is set or reset depending on whether each frame of the video signal is decoded. The method of claim 8, wherein the decoding control unit, And determining whether to decode each frame of the video signal therefrom by checking the flag, and recognizing a predetermined frame decoding drop rate as a decoding error rate.