JP2005130024A - Video reproducing display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video reproducing display apparatus wherein a reproducing section and a display section are integrated and whereby a user can enjoy a video image with an image quality free from deterioration by outputting a video signal without superimposing a copy guard signal on the video signal when it is clear that the video signal is not outputted to a device aiming at video recording such as display of the video image on the built-in display section. <P>SOLUTION: The video reproducing display apparatus is provided with: a conversion means for converting a digital video signal with the copy protection signal superimposed thereon into an analog video signal; the display section for displaying the video image with the analog video signal; and an output section for outputting the analog video signal to an external device. The conversion means applies copy protection to the analog video signal on the basis of the copy protection signal when the analog video signal is outputted to the output section and applies no copy protection to the analog video signal when the analog video signal is outputted to the display section. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a video reproduction display device for reproducing and displaying a digital video signal from a storage medium such as a digital broadcast or a DVD.

  Conventionally, as a technique for preventing illegal copying of a video signal, there is a macrovision specification in which a copy guard signal is added during a burst period of the video signal. When attempting to copy a video signal using an analog VTR compatible with the macrovision specification, a dummy synchronization signal and a color burst signal are recorded on the video tape together with the video signal, thereby preventing normal reproduction of the video signal. This can prevent illegal copying of the video signal.

  In detail, 8 color bursts are usually inserted into the back porch at 3.58 MHz, but there are abnormal bursts with the first 5.5 waves in phase and the second 5.5 waves in reverse phase. Has been inserted. Such a color burst exists at a predetermined H. For example, such a reverse burst is a color burst of 2H continuous every 17H or 4H continuous every 22H.

  When trying to record and reproduce such a video signal, the automatic gain control circuit malfunctions when automatic gain control is performed in the recording unit of the recording apparatus by the pseudo horizontal synchronization signal. In addition, the image quality of the recorded video can be put to practical use by activating the color signal cross-stroke improvement circuit for improving the color signal cross-stroke with the adjacent track in the color signal recording section due to the inverted color burst. Degraded to no level.

  In the DVD-Video system, an area for writing copy protection information is provided in advance in order to cope with such a macrovision specification. In a conventional DVD reproducing apparatus, when reproducing a video signal from a disc, this copy protection information is detected, and a copy guard signal is added to the video signal according to the detection result.

  However, the video signal to which the above-described copy guard signal is added deteriorates in image quality due to a difference in hue and color saturation between the inverted burst line and the normal burst line.

  The present invention has been made in view of the above points, and for example, does not output to a device intended for recording such as displaying video on a display unit built in a device in which a playback unit and a display unit are integrated. Therefore, an object of the present invention is to provide a video reproduction display device that can enjoy a video with no image quality by outputting a video signal without superimposing a copy guard signal.

  In order to achieve the above object, the video reproduction display device of the present invention comprises a conversion means for converting a digital video signal superimposed with a copy protection signal into an analog video signal, a display means for displaying a video based on the analog video signal, An output unit for outputting the analog video signal to an external device, wherein the converting means is configured to output the analog video signal based on the copy protect signal when the analog video signal is output to the output unit. Copy protection is applied to the analog video signal, and copy protection is not applied when the analog video signal is output to the display means.

  The video playback / display apparatus includes playback means for playing back a DVD disc, and the conversion means converts the digital video signal played back by the playback means into an analog video signal.

  In addition, the video playback / display apparatus includes receiving means for receiving a broadcast, and the converting means converts the digital video signal received by the receiving means into an analog video signal.

  In the video playback display device of the present invention, when it is clear that the video is not output to a device intended for recording, the video signal is output without superimposing the copy guard signal on the video signal, thereby enjoying the video with no deterioration. I can do it.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a main part of the embodiment. The present embodiment is a video playback / display apparatus in which a playback section that plays back a digital video signal recorded on a DVD or the like and a display section are integrated.

  In the video reproduction display device 1, each circuit of the entire device 1 is controlled by a control circuit 2. A pickup 4 for reproducing an RF signal from the DVD-Video disc 3 is included. The RF signal reproduced by the pickup 4 is subjected to waveform equalization processing and binarization processing by the RF circuit 5. The reproduction data subjected to such processing is subsequently subjected to decoding processing such as data demodulation and error correction by the data decoder 6.

  Similarly, a signal received by the tuner 8 via the antenna 7 is also decoded by the data decoder 6.

  The demultiprocessor 9 receives the reproduction data subjected to the decoding process, and distributes the reproduction data into main video compression data, sub video compression data, and audio compression data. The main compressed data is given to the video decoder 10, the sub-picture compressed data is given to the sub-compressed decoder 11, and the audio compressed data is given to the audio decoder 12.

  The video decoder 10 performs signal processing on the main video compressed data and outputs the decoded main video data. The main video compressed data is data compressed by the MPEG2 method or the like, and the video decoder 10 performs different decoding processes on the I picture, P picture, and B picture to generate main video data. The video decoder 10 supplies the generated main video data to the sub video decoder 11.

  The sub video decoder 11 performs a decoding process on the sub video compressed data, and synthesizes the decoded data with the main video data supplied from the video decoder 10. That is, the sub-picture decoder 11 synthesizes a sub-picture such as a caption with the main picture. As a result, video data including both the main video component and the sub video component is generated. When there is no sub video data, the main video data is output as video data as it is.

  The video data output from the sub video decoder 11 is given to the NTSC encoder 13. The NTSC encoder 14 generates an NTSC composite video signal from the video data. That is, video data that is a digital signal is converted into video data that is an analog signal, and a synchronization signal or a color burst signal is added to the converted video signal to generate an NTSC composite video signal. As shown in FIG. 2, the generated composite video signal is displayed on the display means 15 or the copy guard signal adding circuit 16 according to the output destination selected by the switch key 14 based on the instruction of the control circuit 2 (step S1). (Steps S2 and S3). That is, when the output destination of the video signal is selected by the switch key 14 to be output to the display means built in the video reproduction display device, the composite video signal is input to the display means 14 and the output terminal 17 Is selected to be output to an external device via the, the signal is input to the copy guard signal adding circuit 16.

  The copy guard signal addition circuit 16 adds a macrovision analog copy guard signal to the blanking period of the composite video signal in accordance with the copy protection information recorded on the DVD-Video disc 2 or the received copy protection information. . A composite video signal with such copy protection is output from the output terminal 17.

  As a result, when outputting to an external device, a composite signal with copy protection is output to prevent illegal copying, and when displaying with the built-in display means 15, a composite signal without copy protection is output. Therefore, the video displayed by the built-in display means 15 can be displayed without deterioration.

  In the above-described embodiment, when the video is selected to be displayed on the display unit 15, the composite video signal is output from the NTSC encoder 12 to the display unit 15 and output to the outside of the device. In this case, the composite video signal is output to the copy guard signal adding circuit 16, but the composite video signal is input to the copy guard signal adding circuit 16 regardless of which is selected. 16 may select whether or not to add a copy guard signal and output it to each.

On the other hand, the audio decoder 12 performs a decoding process on the audio compression data and outputs the decoded audio data. The audio compression data is also data compressed by the MPEG method or the like, and the audio decoder 12 generates audio data by performing a predetermined expansion process. The generated audio data is converted into an analog signal by the D / A conversion circuit 18 and then output to the speaker 19.

It is a block diagram which shows the structure of the principal part of the video reproduction display apparatus of this invention. It is a flowchart which shows operation | movement of this invention.

Explanation of symbols

2 Control circuit 10 Video decoder 11 Sub-picture decoder 13 NTSC encoder 15 Display means 16 Copy guard signal addition circuit 17 External output terminal

Claims (3)

Conversion means for converting a digital video signal superimposed with a copy protect signal into an analog video signal; display means for displaying video based on the analog video signal; and an output unit for outputting the analog video signal to an external device. In the video playback and display device,
When the analog video signal is output to the output unit, the converting unit applies copy protection to the analog video signal based on the copy protect signal, and the analog video signal is output to the display unit. A video reproduction display device characterized by not being copy protected. A reproducing means for reproducing a DVD disc;
2. The video reproduction display device according to claim 1, wherein the conversion unit converts the digital video signal reproduced by the reproduction unit into an analog video signal. Comprising receiving means for receiving broadcasts;
2. The video reproduction display device according to claim 1, wherein the converting unit converts the digital video signal received by the receiving unit into an analog video signal.

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