JPH06178265A - Video disk recording device and video disk reproducing device - Google Patents

Abstract

PURPOSE:To realize the high speed transfer of an optical head to a sector including a succeeding in-pattern coding picture without losing picture quality of a reproduced picture immediately after the reproduction of the in-pattern coding picture is finished in the reproduction of only the in-pattern coding picture. CONSTITUTION:A video disk recording device having a function which divides a bit stream 3 comprising an in-pattern coding picture and an inter-pattern coding picture into sectors and adds an inter-pattern coding sector identification signal representing it that an in-pattern coding picture component is included in each sector, and the video disk reproduction device retrieves a sector including the in-pattern coding picture based on an identification signal written on the disk to realize high speed and stable reproduction function.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video disc recording device and a video disc reproducing device for recording and reproducing digital compressed image data.

[0002]

2. Description of the Related Art It has been proposed to record and reproduce digital image data on an optical disk by intra-frame or intra-field, inter-frame or inter-field processing. In order to record a video for a long time, it is necessary to perform encoding with a high compression rate. In addition, a coding method that depends on inter-frame or inter-field coding cannot realize the functions such as random access and special reproduction peculiar to the disc.

Therefore, inter-frame coding having a high compression rate in which coding is completed between frames or fields based on the correlation between screens and relatively high compression rate in which coding is completed within a single frame or field. A high compression rate is achieved by using a method that also uses low intra-picture coding, and special playback such as queue and review is realized by playing only intra-picture coded data. Hereinafter, the inter-frame coded frame or the inter-field coded field is called an inter-screen coded picture, and the intra-frame coded frame or the intra-field coded field is called an intra-screen coded picture.

[0004]

A video disc recording apparatus for generating digital image data (hereinafter referred to as a bit stream) by an encoder, modulating the obtained bit stream into a recording code, and further recording the disc on a disc. Consider a video disc device in which data is read from a disc recorded by the recording device, a recording code is demodulated, and an image signal is reproduced by an expander. In the above video disc reproducing apparatus, the decompressor determines whether or not the digital data being decoded is the intra-picture coded picture component.

In this case, since a multistage signal processing intervenes up to the decompressor, the method for retrieving the sector containing the intra-picture coded picture component based on the detection result of the decompressor retrieves the data to be reproduced next. Takes time. Therefore, special reproduction such as queue and review for reproducing only the intra-picture coded picture cannot be performed at high speed. Further, if a new request is input during the reproduction of the intra-picture coded picture, the system controller may issue a command to move the optical head to the servo movement system. In this case, the reproduction of the intra-picture coded picture is interrupted. The pickup is moved during the decoding of the intra-picture coded picture. As described above, there is a problem that special reproduction such as searching and reproducing only intra-picture coded pictures cannot be executed at high speed and smoothly.

In view of the above point, in the present invention, as soon as the reproduction of the intra-picture coded picture is completed in the reproduction of only the intra-picture coded picture, the optical head is moved to the sector including the next intra-picture coded picture at high speed. This is achieved without impairing the quality of the reproduced image.

[0007]

A video disc recording apparatus according to the present invention comprises a coder for outputting digital image data and an intra-picture coded picture signal indicating that the digital image data has been intra-coded. An error correction encoder that adds an error correction code to the digital image data in sector units, and based on the intra-picture coded picture signal,
In this configuration, an encoding information adder for adding the intra-coded sector identification signal to the digital image signal or the output signal of the error correction encoder is provided.

Further, the video disc reproducing apparatus of the present invention comprises a coded information detector for detecting an intra-frame coded sector identification signal from the data read from the recording medium recorded by the video disc recording apparatus, An error correction decoder that corrects errors based on the error correction code and outputs a digital image signal, a decompressor that decodes the error-corrected digital image signal and outputs the original image signal, and an intra-picture coded picture When an instruction to reproduce only the input is input, the transfer of the pickup is prohibited when the output from the encoded information detector indicates an intra-coded picture,
At other times, it is equipped with a system controller that moves the pickup according to the special reproduction command.

[0009]

With the above construction of the video disc recording apparatus of the present invention, an identification signal indicating that the digital image data has been generated by intra-picture coding is added to the digital image data in units of predetermined sectors.

Further, the video disc reproducing apparatus of the present invention uses the coded information detector to search for a sector containing an intra-picture coded picture component and read the sector containing the intra-picture coded picture. By prohibiting the transfer of the intra-picture code, only the intra-picture coded picture is input to the decompressor, and the intra-picture coded picture is decoded without interruption.

[0011]

Embodiments of the video disc recording apparatus and the video disc reproducing apparatus of the present invention will be described below. FIG. 1 is a block diagram of a first embodiment of a video disk recording apparatus of the present invention.

In FIG. 1, the video disc recording apparatus outputs an A / D converter 2 for analog / digital converting an analog image signal 1 and a bit stream 3 for highly efficient encoding of the A / D converted image signal. At the same time, an encoder 5 that outputs an intra-picture coded picture signal 4 indicating that the bit stream 3 has been intra-coded, and a buffer 7 that inputs the bit stream 3 and outputs a bit stream 6 having a constant transfer rate And an intra-picture coded picture signal 4 as an input, and a bit stream 6 with a constant transfer rate.
Is divided into sectors each having a predetermined size, and an intra-coded sector identification signal is added to each sector.
And an error correction encoder 9 for inputting a bit stream to which an intra-coded sector identification signal is added and for adding an error correction code, and a digital modulator 10 for digitally modulating the output of the error correction encoder 9. ing.

FIG. 2A shows a bitstream coded by the encoder 5, and the coded information adder 8 converts the bitstream 3 into an intra-coded picture as shown in FIG. 2B. Divide so as to span multiple sectors. In the case of this figure, the intra-coded sector identification signal is added to the digital image data in the diagonally shaded sectors including the components of the intra-coded frame. One sector contains digital image data subjected to error correction processing as shown in FIG. 2C and an intra-coded sector identification signal.

In the first embodiment, the case where the intra-coded sector identification signal is added to the bit stream 6 having a constant transfer rate has been described. However, as shown in the second embodiment of FIG. The same effect can be obtained in the configuration in which the encoded information adder 8 adds the intra-coded sector identification signal to the output of the error correction encoder 9.

FIG. 4 is a block diagram of the third embodiment of the video disk reproducing apparatus of the present invention for reproducing the optical disk recorded by the first embodiment of the video disk recording apparatus of the present invention.

In FIG. 4, the video disc reproducing apparatus includes a digital demodulator 13 for digitally demodulating a reproduced signal detected by the optical head 12 from the optical disc 11, and an error correction decoder 14 for performing error correction on the demodulated digital signal. , A buffer 16 that receives an error-corrected bit stream 15 as an input and outputs a bit stream having a transfer rate required by a decompressor 17, and a bit stream from the buffer 16 as an input, and outputs a decompressed digital original image signal. A decompressor 17, a D / A converter 18 for D / A converting a digital original image signal into an analog original image signal, and an intra-coded sector identification signal added by a video disc recording device from a bit stream 15 are detected. ,
The system controller 20 is provided with a coded information detector 19 for outputting the detection result. When the control signal 21 is input to the system controller 20, the input signal from the coded information detector 19 is intra-frame coded. , The system controller 20 prohibits the servo transfer system 22 from issuing a command to move the optical head 12, and the input signal from the encoded information detector 19 is a signal that does not indicate intra-screen encoding. If so, the system controller 20 issues a command to move the optical head 12 to the servo transfer system 22 in accordance with the command of the control signal 21.

In the third embodiment, the error correction decoder 1
The case where the intra-coded sector identification signal is detected from the bit stream 15 which is the output of No. 4 has been described. The intra-screen is output from the output of the digital demodulator 13 corresponding to the second embodiment of the video disc recording apparatus of the present invention. The third embodiment also applies to the fourth embodiment of FIG. 5 for detecting the coded sector identification signal.
The same effect as that of the embodiment can be obtained.

Further, according to the first and third embodiments, the intra-coded sector identification signal is added to the bit stream 6 having a constant rate, and the error correction encoder 9 performs error correction code processing. Therefore, it is possible to expect reliable detection of the intra-coded sector identification signal in the video disc reproducing apparatus.

According to the second and fourth embodiments, the intra-coded sector identification signal is added to the error code correction coded bit stream, which is different from the third embodiment. Error correction decoder 14 for encoded sector identification signal
Since the processing in (1) is unnecessary, the intra-coded sector identification signal can be detected at high speed, and the target sector can be searched at high speed.

[0020]

As described above, according to the present invention, a video disc recording function for adding an identification signal indicating that digital image data is generated by intra-picture coding to the digital image data for each predetermined sector unit is provided. When the video disc reproducing device is provided in the device, the video disc reproducing device searches the sector including the intra-picture coded picture component by the identification signal written in the disc, and a high-speed and stable reproducing function can be realized.

[Brief description of drawings]

FIG. 1 is a block diagram showing a video disk recording device according to a first embodiment of the present invention.

FIG. 2 is a diagram schematically showing digital image data according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a video disk recording device according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing a video disc reproducing apparatus according to a third embodiment of the present invention.

FIG. 5 is a block diagram showing a video disc reproducing apparatus according to a fourth embodiment of the present invention.

[Explanation of symbols]

 1 analog image signal 2 A / D converter 3 bit stream 4 intra-picture coded picture signal 5 encoder 6 constant transfer rate bit stream 7 buffer 8 coding information adder 9 error correction encoder 10 digital modulator 11 optical disk 12 optical head 13 digital demodulator 14 error correction decoder 15 bit stream 16 buffer 17 expander 18 D / A converter 19 coding information detector 20 system controller 21 control signal 22 servo transfer system

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiya Takemura 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A video disk recording apparatus for recording digital image data digitally compressed by intra-picture coding and inter-picture coding on a recording medium, wherein the digital image data and the digital image data are intra-picture coded. An encoder that outputs an intra-coded picture signal indicating that the error correction code has been added to the digital image data in sector units, and A video disc recording apparatus comprising a digital image signal or an encoding information adder for adding the intra-coded sector identification signal to an output signal of the error correction encoder. 2. A coded digital image signal, an error correction code of the digital image signal, and an intra-coded sector identification signal indicating that the digital image signal includes an intra-coded picture component. A video disc reproducing apparatus for reproducing an image from a recording medium on which is recorded, a coded information detector for detecting the intra-coded sector identification signal, and a digital image signal of a digital image signal based on the error correction code. An error correction decoder that corrects an error and outputs the digital image signal, a decompressor that decodes the digital image signal that has been error-corrected by the error correction decoder and outputs an original image signal, and the encoding information detection A video disc reproducing device equipped with a system controller for controlling the transfer system of the pickup based on the output from the container. 3. The system controller prohibits the transfer of the pickup when the output from the coding information detector indicates an intra-coded picture when an instruction for reproducing only the intra-coded picture is input. The video disc reproducing apparatus according to claim 2, wherein the pickup is moved in accordance with a special reproduction command at other times.