JPH08107540A - Compressed image reproducing device - Google Patents

Abstract

PURPOSE: To provide a function for starting reproduction without any time lag after returning a compressed moving image disk to the preceding part just for decided time when the button of the device is operated during the reproduction concerning the compressed image reproducing device for reproducing the compressed moving image disk. CONSTITUTION: A start code is detected from compressed moving image data from a CD-ROM decoder 2 by a start code detecting part 3, and a sector address at that time is written in a memory 6. A sector address comparing part 5 compares the CD-ROM decoder 2 with the sector address read from the memory 6 and over the decided time, the read address of the memory 6 is advanced to the next. When a button 8 is operated, a system controller 7 reads the sector address from the memory and controls a reproducing mechanism part 1 and the CD-ROM decoder 2 so as to start the reproduction from that sector address.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressed video reproducing apparatus for reproducing a compressed moving picture disc.

[0002]

2. Description of the Related Art Recently, various compressed video reproducing apparatuses have been proposed which reproduce a compressed moving image disc such as a CD-ROM in which a moving image is compressed in conformity with a standard such as MPEG.

A conventional compressed video reproducing apparatus will be described below. FIG. 3 is a block diagram of a conventional compressed video reproducing device. In FIG. 3, 32 is a CD-ROM
A decoder is shown, which plays back a disc on which compressed moving picture information is recorded and converts it into an electric signal by inputting an electric signal from a reproducing mechanism section 31, converts it into compressed moving picture data, and outputs it to a compressed moving picture decoder 33. The compressed moving image decoder 33 converts the input compressed moving image data into a video signal and an audio signal, and outputs them to a video output 36 and an audio output 37, which are output terminals thereof. A system controller 34 receives a signal from an operation unit (not shown) for the user to operate, controls the reproduction mechanism unit 31 and the CD-ROM decoder 32, and controls the movement of the disc. In particular, reference numeral 35 denotes a button for repeat reproduction, and when it is detected that the button 35 has been operated during reproduction, the system controller 34 rewinds by the set time and then reproduces.

The operation of the conventional compressed video reproducing apparatus configured as above will be described below with reference to the drawings. First, the information on the disc is converted into an electric signal by the reproducing mechanism section 31, and the electric signal is converted into compressed moving picture data by the CD-ROM decoder 32 and input to the compressed moving picture decoder 33. The compressed moving image decoder 33 converts the input compressed moving image data into a video signal and an audio signal and outputs the video signal and the audio signal. The system controller 34 includes the reproduction mechanism section 31 and C
It controls the D-ROM decoder 32. The button 35 is used for repeat playback. When the button 35 is operated, the system controller 34 calculates the position of the previous disc for a predetermined time from the current disc position, and moves to that position. Playback mechanism section 31 and C for playback
The D-ROM decoder 32 is controlled to start reproduction from that position.

[0005]

However, since the compressed moving image data has a minimum unit capable of reproducing the image, and the image is reproduced only from the beginning of the minimum unit, the button 35 is operated in the apparatus having the above-mentioned configuration to achieve the purpose. After moving to the position of, the image is not played until the beginning of the minimum unit comes. Therefore, there is a problem that it takes time from the operation of the button 35 to the start of the image.

The present invention solves the above-mentioned problems, and by always moving to the head position of the minimum unit and starting playback, a compressed video playback apparatus in which a video is instantly started after operating a button for repeat playback. The purpose is to provide.

[0007]

In order to achieve this object, a compressed video reproducing apparatus according to the present invention has a reproducing mechanism means for converting information on a compressed moving picture disc into an electric signal and outputting the electric signal, and a reproducing mechanism means for outputting the electric signal. CD-ROM decoder means for inputting an electric signal to convert the compressed video data to a sector address and outputting the same, and the sector address and compressed video data from the CD-ROM decoder means for reproducing a video from the compressed video data. A code indicating the beginning of the smallest possible unit is detected, and a start detection signal is output when it is detected, and compressed moving image data input from the start code detection means is converted into a video signal and an audio signal and output. A compressed moving picture decoder means, a memory means for storing the sector address output by the start code detecting means, and C
The sector address input from the D-ROM decoder means and the sector address read from the memory means are compared with each other, and a sector address comparison means for outputting an address comparison signal when the difference exceeds a set time is detected. It comprises an operating means for generating a repeat request signal, a head detecting signal, an address comparing signal, and a sector address output by the memory means, and a reproducing mechanism means, a CD-ROM decoder means, and a system controller means for controlling the memory means. The system controller means controls the memory means so as to write the sector address from the start code detecting means when the head detecting signal is received from the start code comparing means, and the memory when receiving the address comparing signal from the sector address comparing means. Move the read address of the method to the next When the repeat request signal output from the operating means is received, the sector address is read from the memory means, and the reproducing mechanism means and the CD-ROM decoder means are controlled so as to start reproduction from the sector address. is there.

[0008]

According to the present invention, the start code detecting means detects the leading code of the minimum unit capable of reproducing an image, stores the sector address on the disk having the code in a predetermined time memory means, and repeats. For reproduction, when the operation means is operated, the sector address stored first is read from the memory means, the reproduction mechanism means is driven so as to read the information of the sector address, and reproduction is started from there. The video can be played back instantly after the playback operation.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic block diagram of a compressed video reproducing apparatus according to an embodiment of the present invention. In FIG. 1, 2 is a CD-RO
An M decoder is shown, which inputs an electric signal of compressed moving image information detected from the disc by the reproduction mechanism unit 1 as in the conventional example, converts the compressed moving image data into a sector address, and outputs it. Three
Indicates a start code detecting unit, which is the minimum unit capable of reproducing an image from compressed moving image data input from the CD-ROM decoder 2 (the CD-ROM in this embodiment is MP as a compression means).
EG is adopted, and this minimum unit is Group Of Picture.
Is. Hereinafter abbreviated as GOP. ) Code (M
In PEG, Group Start Code, abbreviated as GSC below. ) Is detected, and the head detection signal is output to the system controller 7 when detected. The sector address input from the CD-ROM decoder 2 is output to the memory 6, and the compressed moving image data is output to the compressed moving image decoder 4. The sector address from the start code detecting unit 3 is written in the memory 6, and the read sector address is the sector address comparing unit 5.
Is input to the system controller 7. The sector address comparison unit 5 compares the sector address from the CD-ROM decoder 2 with the sector address stored in the memory 6 and outputs an address comparison signal to the system controller 7 when the difference exceeds a predetermined time. Reference numeral 8 denotes a button which is an operation means for performing repeat reproduction, and when operated, outputs a repeat request signal to the system controller 7. Similar to the conventional example, the system controller 7 controls the reproduction mechanism unit 1 and the CD-ROM decoder 2 according to the signal of the operation unit (not shown) operated by the user, and controls the writing and reading of the memory 6. I do. In particular, when the repeat request signal is input, the sector address stored first in the memory 6 is called, and the reproducing mechanism section is controlled to reproduce from the sector address. Compressed video decoder 4
Converts the compressed moving image data from the start code detector 3 into a video signal and an audio signal as in the conventional example, and outputs the video signal from the output terminal 9 and the audio signal from the output terminal 10.

The operation, particularly the operation of the repeat function, of the compressed video reproducing apparatus configured as described above will be described below with reference to FIGS. 1 and 2.

In FIG. 1, when the start code detector 3 detects GSC, the sector address at that time is stored in the memory 6. The sector address is held for the same time as when the button 8 is operated to return. When the button 8 is operated, the system controller 7 reads out the oldest sector address stored in the memory 6 and moves to the sector address to start the reproduction, so that the system controller 7 reproduces the reproducing mechanism 1 and the CD-ROM decoder. Control 2

A detailed description will be given below with reference to FIG. FIG. 2A is a C showing the recording structure of a CD-ROM disc.
It is a structural schematic diagram of a D-ROM disc, and is divided into each sector. GSC1 in the sector of absolute time t1,
GSC2 is included in the sector at the absolute time t2. Figure 2
(B) shows a schematic diagram of the structure of the memory, WA1, WA2,
WA3 represents a write address, and RA1, RA2, RA3 represent read addresses.

It is also assumed that the time for returning when the button is operated is set to d. At the absolute time t1, when the start code detector 3 detects GSC, the head detection signal is sent to the system controller 7. Upon receiving the head detection signal, the system controller 7 writes the sector address GSC1 from the start code detection unit 3 at the position indicated by the write address WA1 in the memory 6. Then, the write address is advanced to WA2. At this time, the read address is RA1.
And Then, at the absolute time t2, the sector address GSC2 is similarly written at the position indicated by the write address WA2.

In the sector address comparison unit 5, a CD-ROM
The sector address currently being reproduced from the decoder 2 and the sector address GSC1 at the position of the read address RA1 read from the memory 6 are constantly compared.

When the absolute time is t1 + d, the difference between the current sector address and GSC1 is d, so that the sector address comparison unit 5 sends a pulse to the system controller 7. When the system controller 7 receives the pulse, it advances the read address to RA2, and thereafter the sector address GS.
C2 is read out.

Similarly, when the absolute time is t2 + d, the difference between the current sector address and GSC2 is d, so the read address changes from RA2 to RA3.

Therefore, the read address always indicates the oldest sector address whose time difference from the current sector address is within d.

When the button 8 is operated, the system controller 7 inputs a repeat request signal from the button 8, and the oldest sector address GSC1 from the memory 6 is the absolute time t1 + d during the absolute time t1 to t1 + d.
Is the oldest sector address GSC from to t2 + d
2 is read out, and the reproduction mechanism section 1 and the CD-ROM decoder 2 are controlled so that reproduction is started from that address.

As described above, according to this embodiment, the sector address of the sector including the GSC is stored in the memory 6, and the read address of the memory 6 is always the oldest sector address whose time difference from the current sector address is within d. When the button 8 is operated, the sector address pointed to by the read address of the memory 6 is read out, and playback is started from that sector, so there is no time lag between the button operation and the start of the image, and the decision is made instantly. It is possible to go back and reproduce by the given time d.

The present invention is not limited to the above embodiments, and various modifications can be made based on the spirit of the present invention, and these modifications are not excluded from the scope of the present invention.

[0022]

As described above, according to the present invention, the reproducing mechanism means for converting the information on the compressed moving picture disc into an electric signal and outputting the electric signal, and the sector address and the compressed moving picture data inputted with the electric signal outputted by the reproducing mechanism means. CD-RO converted to and output
The sector address and the compressed moving picture data from the M decoder means and the CD-ROM decoder means are input, a code indicating the beginning of the smallest unit capable of reproducing an image is detected from the compressed moving picture data, and a head detection signal is output when detected. Start code detecting means, compressed moving picture decoder means for converting the compressed moving picture data input from the start code detecting means into a video signal and an audio signal and outputting the same, and a memory means for storing the sector address outputted by the start code detecting means. And a sector address comparison means for comparing the sector address input from the CD-ROM decoder means with the sector address read from the memory means and outputting an address comparison signal when the difference exceeds a set time, operated by the user. Occasionally a repeat request signal is generated, the start detection signal and address The comparison signal and the sector address output from the memory means are inputted, and the reproduction means means, the CD-ROM decoder means and the system controller means for controlling the memory means are provided. The system controller means receives the start detection signal from the start code comparison means. When receiving, the memory means is controlled so as to write the sector address from the start code detecting means, and when the address comparing signal is received from the sector address comparing means, the read address of the memory means is advanced to the next and the operating means outputs. When the repeat request signal is received, the sector address is read from the memory means, and the reproducing mechanism means and the CD-ROM decoder means are controlled so as to start the reproduction from the sector address, so that the image can be reproduced without fail. Contains a code that indicates the beginning of the smallest unit It provides a compressed video playback device that allows you to play back from a specific time instantly without any time lag between the button operation and the start of the video to start playback. is there.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a compressed image reproducing apparatus of the present invention.

2A is a schematic diagram of the structure of a CD-ROM disc of the same, and FIG. 2B is a schematic diagram of the structure of a memory of the same.

FIG. 3 is a schematic configuration diagram of a conventional compressed image reproducing device.

[Explanation of symbols]

 1 Playback Mechanism Section 2 CD-ROM Decoder 3 Start Code Detection Section 4 Compressed Video Decoder 5 Sector Address Comparison Section 6 Memory 7 System Controller 8 Button 9 Video Output Terminal 10 Audio Output Terminal

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location H04N 5/937 9369-5D G11B 27/10 A

Claims (1)

[Claims] 1. A reproducing mechanism means for converting information on a compressed moving picture disc into an electric signal and outputting the electric signal, and a CD for inputting an electric signal outputted by the reproducing mechanism means and converting into a sector address and compressed moving picture data for outputting. -ROM decoder means,
A start code for inputting a sector address and compressed moving picture data output by the CD-ROM decoder means, detecting a code indicating the beginning of the smallest unit capable of reproducing an image from the compressed moving picture data, and outputting a start detection signal when detected. A detecting means; a compressed moving picture decoder means for converting the compressed moving picture data inputted from the start code detecting means into a video signal and an audio signal and outputting the same; and a memory means for storing the sector address outputted by the start code detecting means. A sector address comparing means for comparing a sector address input from the CD-ROM decoder means with a sector address read from the memory means and outputting an address comparison signal when the difference exceeds a set time; Operation means that generates a repeat request signal when A dress comparison signal and a sector address output from the memory means are input, and the playback mechanism means, the CD-ROM decoder means, and system controller means for controlling the memory means are provided. The system controller means includes the start code. When the head detection signal is received from the comparison means, the memory means is controlled to write the sector address from the start code detection means, and when the address comparison signal is received from the sector address comparison means, the memory means is read out. The address is advanced to the next, and when the repeat request signal output by the operating means is received, the sector address is read from the memory means, and the reproducing mechanism means and the CD are arranged to start reproduction from the sector address.
A compressed video playback device characterized by controlling ROM decoder means.