JPH0644691A - Video disk player - Google Patents

Abstract

PURPOSE:To correspond to the character broadcasting by providing a character broadcasting decoding circuit reproducing the video disk recording character addition information by means of data format to be used for teletext broadcasting and a screen display means. CONSTITUTION:A character information signal (g) is waveform formed by a waveform forming circuit 81, processed by a signal processing circuit 82, stored in a memory circuit 83, and turned to be a character broadcasting data signal (s), then replaced by a character video signal by a decoding circuit 85. A subcode data signal (e) outputted from an EFM decoder is inputted to a memory circuit 84, and the stored character information signal is controlled by a controller 86, and a signal (p) separating a control signal and a data signal is outputted to the circuit 85. At this point, as each signal has the same format, the video disk and the character information by broadcasting can arbitrarily be selected by switching a switch 87.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a superimpose,
The present invention relates to a player for reproducing and arbitrarily displaying a video disc on which characters such as subtitles and graphic information are multiplexed and recorded.

[0002]

When additional information, such as the character multiplex broadcasting currently being performed, is to be multiplexed and recorded on a video disk, the character information is recorded during the vertical blanking period as is done in the broadcast. When attempting to multiplex, there is no period for recording character information on a video disc because the disc control signals such as addresses are multiplexed. If image information is inserted during this period, a video disc system of a completely new standard is required.

[0003]

The digital audio recorded on a video disc is in CD format. Since a subcode area is prepared for this signal for use in graphics, etc., character information is recorded in multiplex in this area. The data at this time is recorded in a character multiplex broadcasting format, and at the time of reproduction, the player is provided with a decoding circuit, a superimposing circuit, and a screen display circuit, and arbitrarily displays character information on the screen. Alternatively, by exchanging the disc control signal and the character information signal in the vertical blanking period, character information is obtained by an external decoding circuit.

[0004]

By such a method, even in the case of a video disc in which there is no empty period in the vertical blanking period of the video signal, the character information can be multiplex-recorded and compatibility with the existing players can be maintained.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. The signal a read from the video disc 1 by the optical pickup 2 takes out the EFM signal b by the LPF 3.
The EFM signal b is divided by the EFM decoder 4 into the sub-code data e and the digital audio signal c, and is input to the teletext decoder 8. Also, the voice signal b is transmitted by the HPF6.
The video RF signal h separated from is subjected to signal processing such as demodulation and time axis correction in the video signal processing circuit 7, and is output to the TV screen.

On the other hand, the character information signal g by broadcasting is TV demodulated. The broadcast signal f is demodulated by the character information signal separation circuit 11 and separated from the composite video signal, and then the signal g which has been subjected to error correction and the like is input to the character broadcast decoder 8. The signal j output from the teletext decoder 8 converts text information data into a video signal, adds a synchronization signal, and outputs T
An image display circuit 9 for displaying on the V screen, and a superimpose inserting circuit 10 for inserting character information in the video.
After that, the switch 14 arbitrarily selects and outputs it.

Next, the operation of the teletext decoder 8 will be described with reference to FIG. Character information signal g divided from broadcast signal f
Waveform is shaped by the waveform shaping circuit 81, and the signal processing circuit 8
In step 2, signal processing, error correction, separation of control signal and data signal, etc. are performed and stored in the memory circuit 83 to become the teletext data signal s, and the decoding circuit 85
Is replaced with the character video signal. These series of signal processings are controlled by the controller 86 and can be realized by using a conventional decoding method for teletext.

Here, the subcode data signal e output from the EFM decoder 4 is processed by the EFM decoder such as error correction and data conversion of the signal. Therefore, the character information signal input to and stored in the memory circuit 84 is stored. Inputs into the decoding circuit 85 the signal p which is controlled by the controller 86 and in which the control signal and the data signal are separated.

Since the formats of the respective signals are the same at this point, the character information by the video disc and the broadcast can be arbitrarily selected by switching the switch 87. The switch 12 is a switch for selecting the video signal k of the video disc and the broadcast video signal l, the switch 13 is for inserting the superimpose, and the switch 14 is a switch for arbitrarily selecting the screen only for character information and the moving image screen. is there.

FIG. 3 shows another embodiment of the present invention. Figure 1
The character information data p obtained in the same manner as in FIG. 2 is converted by the character broadcast encoder 16 into a signal z in the character broadcast format by adding a signal such as a synchronization signal and an error correction code. The switch 15 is used to insert the signal z and the video signal i in the vertical blanking period. The signal t thus obtained
Is decoded by an external teletext decoder. In addition to this, if signals such as a synchronization signal and an error correction code are recorded in advance as subcode data, the amount of information that can be multiplexed is reduced, but since the teletext encoder 16 can be omitted, the player circuit configuration can be further simplified. it can.

[0011]

According to the present invention, since a video disc in which character information is recorded in the sub-code area of the digital audio of the video disc is reproduced, a new function can be added while maintaining compatibility with the conventional video disc. And by using the teletext format,
Not only video discs but also teletext can be supported.

[Brief description of drawings]

FIG. 1 is a block diagram of a video disc player of the present invention.

FIG. 2 is a block diagram of a main part.

FIG. 3 is a block diagram showing another embodiment of the present invention.

[Explanation of symbols]

 1 Video Disc 2 Optical Pickup 3 LPF 4 EFM Decoder 5 D / A Converter 6 HPF 7 Video Signal Processing Circuit 8 Teletext Decoder 81 Waveform Shaping Circuit 82 Signal Processing Circuit 83, 84 Memory Circuit 85 Decoding Circuit 86 Controller 87 Switch 9 Image Display Circuit 10 Superimpose circuit 11 TV demodulation. Character information signal separation circuit 12, 13, 14, 15 switch

Claims (3)

[Claims] 1. A sub-code area of an EFM digital audio signal of CD format in a reproducing player which reproduces a video disc on which digital audio of CD format is recorded and arbitrarily displays additional information of characters on a screen. A video disc comprising a teletext decoding circuit for reproducing a video disc having additional information of characters recorded in a data format used for teletext broadcasting, and a screen display means for displaying the text information. Player. 2. The video disc player according to claim 1, further comprising a superimpose circuit for superimposing the reproduced video signal. 3. An encoding circuit for adding a synchronizing signal and an error correction code to the reproduced character information signal, and an inserting circuit for inserting the character information signal instead of the control signal of the player. One video disc player.