FR2513420A1 - DISC PLAYER IN PARTICULAR OPTICAL DIGITAL DISC - Google Patents

Abstract

A. DISC PLAYER, ESPECIALLY OPTICAL DIGITAL DISC. B. READER INCLUDING A READING DEVICE 3, 4, 5, 6 ASSOCIATED WITH A DECRYPTION 7 CONNECTED TO A CONTROLLER 8 WHICH SEQUENTIALLY CONTROLS THE OPERATION OF THE DRIVE DEVICE 12 COMMANDING THE MOVEMENT OF THE READING DEVICE 3 AS A FUNCTION OF THE PRESET TIME COUNTED BY THE CLOCK 13. C. THE INVENTION APPLIES TO READING BY SAMPLING OR CATALOG-TYPE RECORDING DISCS.

Description

"Disk Drive including optical digital disc" The present

  Disclosed is a disk drive for reproducing an information signal recorded on a disk having a set of program information sectors, these sectors being recorded with address information, as is known from the general fagron for

digital audio discs.

  The invention more particularly relates to a disk player for reproducing the beginning of each sector of program information recorded on a disk during a short period of time.

  time period, predefined, in sequences.

  A digital audio disk system is known in which the digital audio disk, which is a disk-shaped rotary recording medium containing digital audio signals as program information, is read on a disk drive during playback. , the digital audio signal recorded on the disc is easily

  reproduces and gives a high quality signal.

  program recording recorded on such a digital audio disc is generally associated with address information; in reproducing the program information by the disk player, it is possible to selectively reproduce one of the program information sectors recorded on the disc using

address information.

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  The present invention aims to create a disk player for reproducing program information contained in a disc, this information being recorded with address information, so as to allow the review of all the information of program recorded on the disc in

a relatively short time.

  The invention also aims to create a disk player for reproducing the initial part of the beginning of each sector of program information recorded on a disc carrying both program information and information.

  corresponding address, for example an audio disc.

  numerically, so as to allow this sequential reading

  in a predetermined time, short, in a determined order of address, using the address information

  associated with each program information area.

  For this purpose, the invention relates to a disk player for partially and sequentially reproducing each sector of program information, for example on a digital audio disk. During the partial sequential reproduction of the program information sectors by the reader according to the invention, the beginning of each sector of program information recorded on the disk is reproduced for a predetermined short time which is such that the content of each program information sector can be distinguished or, following a sequential order of sectors

  program information on the disc.

  As a result, all the program information recorded on the disc can be reviewed in a relatively short time. This way of reproducing, according to the invention, will be called

"catalog type reproduction".

  The present invention will be described in more detail with the aid of the accompanying drawings in which FIG. 1 is a block diagram of the main parts of an embodiment of a disk drive according to the invention. FIG. A front view of an embodiment of a disk drive according to the invention. FIG. 3 is a block diagram of the main part of another embodiment of a reader.

disc, according to the invention.

  DESCRIPTION OF DIFFERENT EMBODIMENTS

PREFERENTIALS -

  FIG. 1 shows an exemplary disk drive according to the invention. In this example, disk 1 carries the program information consisting of a set of program information sectors and address data associated with each sector of FIG. program information; it is for example a digital audio disk on which the audio signal is recorded in the form of binary data with bit address data Disk 1 is placed on the disk drive, according to the invention, and it is driven at a predetermined rotational speed by a motor 2 The program information recorded on the disk 1 is read by a reading device In the present example, it is an optical disk drive and the reading device consists of an optical head 3 The optical head 3 projects a laser light beam on the disk 1 and receives the laser light reflected by the disk 1; this light is modulated according to the program information recorded on the disc 1 The reflected laser light

  who has crossed the optical head 3, passes on a photo-

  detector 4 but which performs the photoelectric conversion according to the laser light reflected on the photodetector 4 to give a reproduced signal corresponding to the information

  program read by optical head 3.

  The reproduced signal is shaped into an appropriate curve to give a digital signal representing the program information contained in the address data; this shaping is done by the forming circuit 5; the output signal is applied to a decoder 6 The decoder 6 gives a program information signal S formed of binary data no longer containing address data, and a Q address data in the form of binary data. address data Q represents the address of the program information sector which is reproduced at this time The program information signal S is applied to a locking circuit (not shown in the figures) to process the information signal S decreases the content of the address data Q to provide an output signal P corresponding to the address of the program information area reproduced on this occasion

  and provides it to a system controller 8.

  The catalog type reproduction key 9 makes it possible to control the disk drive to perform this catalog type reproduction. The catalog type reproduction key 9 is constituted by a pushbutton placed on the control panel 11 of the box. disc, like the other command buttons, as shown in the

  Figure 2 which shows the outside of the disk drive.

  When the reproduction key of the catalog type 9 is actuated, a CT catalog type reproduction control signal is applied to the system controller 8 from the key 9; this control signal causes the system controller 8 to generate a control signal C 1

  which positions the optical head 3 at the beginning of a recording area.

  recording information on the disk 1 and supply this information to a driving device 12 associated with the optical pickup 3 The driving device 12 moves the optical pickup 3 to lead it to the beginning of the pickup area. recording information from disk 1 according to the control signal C1 If the optical head 3 is already there, it is not moved In this case, the information recording area of the disk consists of a spiral track surrounding the center of disc 1 following a step

  weak and generally an address for the information sectors.

  program information so that program information can be reproduced from inside to

  outside the information recording area.

  The optical head 3 is at the beginning of the side of the innermost part of the information recording area of the disk 1; in other words, the head is at

  beginning of the area corresponding to the first sector of information

  program for the first address (address N O 1).

  During this movement, the optical pickup 3 reads the program information containing the address data and the position of the optical pickup 3 is detected according to the output signal P of the deciphering circuit. 7 which provides the reproduced address data Q. Then the optical pickup 3 starts reading the first program information sector corresponding to address 1 by performing a normal reading and then reproducing the first information sector of At this time, the output signal P of the decryption circuit 7 represents the address 11 and the controller 8 provides a start signal Ts at a clock 13 so as to start the operation of the program. the clock 13; the clock 13 measures

  the time since the reproduction of the first part of

  The clock 13 overflows when its content reaches the predetermined short time and gives an overflow signal To; then the clock is reset and goes into standby mode. The time that elapses between the start of the measurement and the overflow of the clock 13 is fixed for example at 10 seconds; this time can be set at any other short time The overflow signal To of the clock 13 is applied to the controller 8 which generates a control signal C 2 to move the optical head 3 at the beginning of the zone in which the second is recorded. address (address NO 2) corresponding to the second program information sector following the first program information sector; the driving device 12 thus receives the control signal C 2 In response to the control signal C 2, the driving device 12 moves the optical reading head 3 in rapid advance at the beginning of the recording area of the second sector program information At this time the optical pickup 3 reads the address data in fast forward the Q address data thus reproduced is provided

to the deciphering circuit 7.

  The control signal C 2 varies in response to the output signal of the deciphering circuit 7 representing the address read by the optical pickup 3; the driving device 12 is controlled according to this variation of the control signal C 2 to search the beginning of the zone in which the second program information sector is recorded. This means that the position control of the read head optical 3 is done using the registered address data

  on disk l with program information.

  After this operation, the optical pickup 3-begins to read the second program information sector corresponding to the address N O 2 by performing this read in normal reproduction mode; as a result, the reproduction of the second program information sector corresponding to the address-n O 2 begins At the same time as this operation is performed, the controller 8 again supplies the start signal Ts to the clock 13 for start the operation of the clock 13; the optical pickup 3 continues reading the second program information sector corresponding to the address 2 until the content of the clock 13 reaches the predetermined short time then the clock 13 gives a signal of When the clock 13 supplies this overflow signal To and applies it to the controller 8, this controller 8 generates a control signal C 3 for

  move the optical head 3 at the beginning of the zone corresponding to

  for the registration of the third sector of information

  program setting corresponding to the third address (address No. 3), sequentially with respect to the second program information sector; the optical reading head 3 is moved to the beginning of the zone in which this third program information sector corresponding to the address NO 3 is located in the same way as the displacement at the beginning of the zone corresponding to the recording of the second program information sector After this movement, the optical head 3 begins reading the third program information sector corresponding to the address No. 3

  and the clock 13 starts to work.

  Then, the controller 8 generates the respective control signals up to the control signal CN to move the optical pickup 3 at the beginning of the area in which the last sector is recorded the program information corresponding to the last address (address n) and this whenever the content of the clock 13 reaches a short counting time, predetermined, and provides the overflow signal To; the operation thus described is repeated until the beginning of the last corresponding program information sector is reproduced

at the address n.

  As described above, the beginning of each of the program information sectors recorded on the disk 1 is reproduced for a predetermined short time, sequentially in the order of the given addresses for each program information sector, which corresponds to to reproduction

called "catalog type".

  Although in the embodiment shown in FIG. 1, the reproduction time during which the initial part of each program information sector is reproduced, is a predetermined time on the clock 13, in the case where the address data associated with each program information sector contains time information representing the time reproduced from the beginning, it is possible to determine the reproduction time corresponding to the beginning of each program information sector using

  such time information without using the clock 13.

  Figure 3 shows another embodiment of a disk drive according to the invention; in this player,

  the reproduction time of the beginning of each sector of information

  In this embodiment, the reproduced address data Q which contains the time information is obtained from the decoder 6 when each of the program information is determined using the time information as mentioned above. program information sector is reproduced in the normal reproduction state and this reproduced address data Q is supplied to both the decryption circuit 7 and the time information decryption circuit 14 The deciphering circuit of time information 14 decrypts the time information contained in the reproduced address data Q to generate an output signal P 'corresponding to the time of

  reproduction from the beginning of each sector of information

  program and provides this signal as well as

  the output signal to a comparator 15.

  A time setting device 16 is provided to give a time setting signal Ti corresponding to a predetermined short time, fixed for example to 10 seconds, the set time signal Ti is applied to the comparator 15 The comparator 15 compares the signal of output P 'of the time information deciphering circuit 14 and the set time signal Ti of the time setting device 16 and gives an output signal To' when the signal of

  output P 'coincides with the set time signal Ti.

  The output signal To 'corresponds to the overflow signal To of the embodiment of FIG.

  this signal is supplied to the controller 8 of the system.

  The controller 8 generates the control signals C 2 Cn to move the optical pickup 3 each time the output signal To 'of the comparator 15 is applied thereto. As a result, the reproduction time

  during which the beginning of each sector of information

  program is reproduced in catalog type reproduction mode, is determined by the short time

  set beforehand on the time adjusting device 16.

  As described above, the disk drive according to the invention makes it possible to read the beginning of each of the program information sectors recorded on the disk for a predetermined short time, sequentially which makes it possible to review all the news

  recorded on the disc in a relatively short time.

  For example, in the case where the program information recorded on the disc corresponds to a set of musical pieces, it is possible to make a preliminary reading to have a summary of all pieces then to reproduce

  this or that piece chosen preferably.

  The disk drive according to the invention also makes it possible to classify the disks according to

their recordings.

  The present invention applies not only to optical-type disk drives for digital audio and optical disk systems, such as those described above but also to other disk drives with very high-quality playback devices. different and which are used in digital audio disc systems other than audio or different optical digital disc systems

video disc systems.

Claims (1)

R E V E N D I C A T I 0 N S   A disk player for reproducing an information signal of a disk on which a plurality of program information sectors are recorded, each time with address information, sequentially, in a predetermined order of addresses, characterized in that it comprises a reading device (3) cooperating with the disk (1) to read the program information sectors S and the Q address information recorded on the disk 1, a drive means (12) for moving the reading device (3) with respect to the surface of the disk (1), decrypting means (7) for decrypting the reproduced address data Q contained in the reproduced signal supplied at the output of the reading device (3, 5, 6), a system controller (8) for controlling the drive means (12) according to the decipherer output signal (7) for positioning the reading device (3) at the beginning of each information sector program r the disk (1), sequentially in a predetermined address order and for operating the reading device (3) to read the beginning of each program information sector for a predetermined short time immediately after the reading (3) has been set   at the beginning of each program information area.   ) Disk reading device, characterized in that the disk (1) is a disk containing the program and address information sectors in digital form.   ) Disc reading device according to the   claim 1, characterized in that the disk is an optical digital disk and the reading device (3) comprises a photodetector (4) and a circuit for shaping   signals (5) associated with a decoder (6).   Device according to claim 1, characterized in that the controller (8) comprises a preset clock (13) which counts a determined time corresponding to the read time of the beginning of the program information sector recorded on the disk. ) Device according to claim 1, characterized in that the controller (8) comprises a comparator (15) and a time adjustment device (16) which provides a predetermined time, the comparator providing an end of count signal at the coincidence of the signal provided by the controller (8) and   of the signal set on the adjusting device (16).