GB2130398A - Chapter searching method and system for record medium - Google Patents
Chapter searching method and system for record medium Download PDFInfo
- Publication number
- GB2130398A GB2130398A GB08324596A GB8324596A GB2130398A GB 2130398 A GB2130398 A GB 2130398A GB 08324596 A GB08324596 A GB 08324596A GB 8324596 A GB8324596 A GB 8324596A GB 2130398 A GB2130398 A GB 2130398A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chapter
- chapter number
- searching
- adjustment means
- record medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
- G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
- G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
- G11B27/3027—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording used signal is digitally coded
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B21/00—Head arrangements not specific to the method of recording or reproducing
- G11B21/02—Driving or moving of heads
- G11B21/08—Track changing or selecting during transducing operation
- G11B21/081—Access to indexed tracks or parts of continuous track
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B21/00—Head arrangements not specific to the method of recording or reproducing
- G11B21/02—Driving or moving of heads
- G11B21/08—Track changing or selecting during transducing operation
- G11B21/081—Access to indexed tracks or parts of continuous track
- G11B21/083—Access to indexed tracks or parts of continuous track on discs
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/102—Programmed access in sequence to addressed parts of tracks of operating record carriers
- G11B27/105—Programmed access in sequence to addressed parts of tracks of operating record carriers of operating discs
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
Landscapes
- Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
- Moving Of Head For Track Selection And Changing (AREA)
Abstract
A chapter searching method and system for a record medium having chapter number data and chapter stop data indicating the ends of the chapters. Chapter number data is first searched by coarse adjustment means and then searched by fine adjustment means which are adapted respectively coarsely and finely to adjust the relative position, in a direction perpendicular to a record track, of a pickup and the record medium. During coarse adjustment, when chapter number data, which is being reproduced, reaches the desired chapter number data and a chapter stop data corresponding to the desired chapter number data is detected, driving of the coarse adjustment means is stopped. During fine adjustment, a reproducing operation is carried out at a predetermined high speed, to move the pickup to a position which is immediately before the position of the desired chapter number data, and thereafter a normal reproducing operation is carried out. <IMAGE>
Description
SPECIFICATION
Chapter searching method and system for record medium
This invention relates to chapter searching methods for record media, and more particularly to a chapter searching method of a record medium having chapter number data and chapter stop data.
Sometimes, so-called "chapter numbers" which correspond to those in a document or book are recorded on a video disc which is one of the record media. In order to search an image corresponding to "a desired chapter", it is necessary to perform a so-called "chapter searching operation" with the number of the desired chapter specified. The operation is carried out by suitably driving a coarse adjustment system and a fine adjustment system which are adapted to control the relative position, in a direction perpendicular to the record track (in a radial direction of the disc), of the pick-up and the record disc. The coarse adjustment system comprises a so-called "silver forwarding mechanism" for forwarding the pick-up or the record disc in a radial direction.The fine adjustment system comprises a mechanism for slightly deflecting the data detecting point of the pick-up in the radial direction. One example of the latter mechanism for an optical record disc is the assembly of a tracking mirror for deflecting data reading spot light and means for rotating the mirror.
A conventional method of searching a chapter with the above-described coarse adjustment means and fine adjustment system will be described with reference to Figure 1. For instance in a search for chapter No. 2 from chapter No. 5, first the coarse adjustment system is operated to scan the record medium in the reverse direction (SCAN REV), to detect a chapter number. When a chapter number detected is smaller than the desired chapter number, the operation of scanning the record medium in the reverse direction (hereinafter referred to as "a scanning operation in the reverse direction", when applicable) is suspended (to tot1). Next, the coarse adjustment system is operated again to scan the record medium in the forward direction (SCAN FWD) to detect a chapter number.When a chapter number larger than the desired chapter number is reached, the operation of scanning the record medium in the forward direction (hereinafter referred to as "a scanning operation in the forward direction", when applicable) is suspended (t1 tot2).
The fine adjustment system is then driven to perform a reverse reproduction at a speed of fifteen times as fast (x1 5 REV) for instance, so that a chapter number smaller than the desired chapter number is reached (t2 tot3). In the case where the chapter searching method is optically carried out, multiplespeed reproduction can be achieved by controlling the angle of rotation of the tracking mirror to jump fifteen tracks in one action.
Thereafter, the normal reproduction is carried out (NORMAL FWD) (t3 tot4) to reach the desired numbers "2". Thus, the desired chapter number "2" is played (reproduced).
Employment of the above-described chapter searching method is advantageous in that a circuit for practicing the method is relatively simple because only a function of determining whether a present chapter number is larger than or smaller than or equal to a desired chapter number is required for a circuit adapted to perform chapter number comparison. However, the method is disadvantageous in that the chapter searching time (to tot4) is long.
Thus, in order to use the method effectively, it is necessary to reduce the chapter searching time.
Summary of the invention
Accordingly, an object of this invention is to provide a chapter searching method in which a circuit for practicing the method is simple and the chapter searching time is reduced.
In accordance with the invention, a chapter searching method is disclosed in which, on a record medium having chapter number data and chapter stop data indicating the stops of said chapter number data, desired chapter number data is first searched by coarse adjustment means and then searched by find adjustment means which are adapted respectively to coarsely and finely adjust the relative position, in a direction perpendicular to a record track, of a pick-up and said record medium.
During coarse adjustment, when chapter number data which is being reproduced reaches the desired chapter number data and a chapter stop data corresponding to the desired chapter number data is detected, driving of the coarse adjustment means is stopped.
During fine adjustment, a reproducing operation is carried out at a predetermined higher speed, to move the pick-up to a position which is immediately before the position of the desired chapter number data, and thereafter a normal reproducing operation is carried out.
This invention will be described with reference to the accompanying drawings and the description of the preferred embodiment that follows.
Brief description of the drawings
Figure 1 is an explanatory diagram showing a conventional chapter searching method;
Figure2 is an explanatory diagram showing the arrangement of chapter numbers, chapter stops and frame numbers;
Figure 3 is an explanatory diagram showing one example of a chapter searching method according to this invention;
Figure 4 is a block diagram showing a device for practicing the method of the invention; and
Figure 5 is a flow chart indicating a chapter searching procedure including the method of the invention.
Description of the preferred embodiment
Figure 2 is a diagram showing chapter numbers and chapter stops used in the invention. In Figure 2, reference numerals 1,2,3 and so on designate the chapter numbers of image on a record disc which correspond to the chapter numbers of a document.
Each chapter consists of a plurality of frames (which are so-called "television frames" each of providing one television picture) which correspond to pages.
For instance, chapter 1 consists of the first (1sot) frame through the 9999-th frame, and chapter 2 consists of the 10000-th frame through the 17999-th frame. Thus, a chapter can have an optional number of frames.
In order to indicate the stop or termination of each chapter, the first part of the frames of chapter is provided with a so-called "chapter stop code" as indicated by the oblique lines in Figure 2. Those chapter stop codes, chapter number codes and frame number codes are recorded on the same recording track together with the corresponding image data.
The chapter stop code is used to change a chapter being reproduced to the first part of the next chapter or to change a chapter being reproduced to the first part of the same chapter. That is, it is used to switch an image to another one. This is denoted as a "chapter stop function" which is used in a video disc player. The chapter stop code is positively employed for chapter searching in the invention. Figure 3 shows one example of the chapter searching method according to the invention.
The chapter searching method of this invention will now be described with reference to the situation where a chapter searching operation is made to switch chapter number 5 to chapter number 2. First the coarse adjustment system is driven to scan the record medium in the reverse direction (SCAN REV).
When the current chapter number is equal to the desired chapter number 2 and the chapter stop data (indicated by the oblique lines in Figure 3) of the aimed chapter number 2 is detected, the scanning operation in the reverse direction is stopped (to tot1).
Next, the fine adjustment system is operated to perform a reverse reproduction, for instance, at a speed of fifteen times as fast (x15 REV), and when the current chapter number is smaller than the desired chapter number 2, the reverse reproduction is stopped (t1 tot2). Then, the normal reproduction is carried out (NORMAL FWD) to the top of the desired chapter (t2 tot3). Thereafter, the image of the chapter 2 is reproduced (PLAY).
Thus, all that is required for the chapter number comparison circuit is to determine whether the present chapter number is larger than or smaller than or equal to the aimed chapter number. The chapter searching operation can be achieved in a shorter time.
Figure 4 is a block diagram outlining a reproducing system for practicing the method of the invention. A pick-up 1,which is for instance an optical pick-up, receives light reflected from a record disc (now shown) to provide an electrical signal. The signal thus provided is amplified by amplifier 2 and is then applied to a demodulator 3. A decoder 4 is provided to extract a chapter number signal and a chapter stop signal from the output signal of the demodulator 3. The chapter number signal is applied to one input terminal of a comparator 5, where it is compared with a desired chapter number that is specified by a chapter designation 6.
The chapter stop signal from the decoder 4 together with the output signal of the comparator 5, which represents the fact that the chapter number signal is larger than or smaller than or equal to the desired chapter number signal, is applied to a sequence controller 7. It is used as a sequence control signal in the chapter searching operation. A start instruction signal is externally applied to the sequence controller 7 and operation is started in response to a chapter search instruction. The output of the sequence controller 7 drives or stops the coarse adjustment system 8 or the fine adjustment system 9.
Figure 5 is a flow chart showing a chapter searching procedure including the chapter searching method according to the invention. In Figure 5, reference character SCN designates a desired chap.
ter number; CCN, a current chapter number; Y, "yes", and N, "no" decision point. The flow chart will be understood by one of working skill as reflecting the sequence of operation of the circuit of
Figure 4. The "decision" diamonds and their output branches are illustrated together with the substantive operations that occur in the routine.
As is apparent from the above description, according to the invention, the chapter searching operation is achieved in a short time employing a simple circuit. In addition, under the scanning (SCAN) condition the pick-up scanning direction (the slider forwarding direction) is not switched. Therefore, the method of the invention is not affected by the delay in the switching operation and by the weight of the pick-up.
The method of the invention is applicable to electrostatic record media as well as optical record media. The device for practicing the method of the invention is not limited by that circuit in Figure 4.
That is, it may be formed by using a so-called "microcomputer" such as a microprocessor which is suitably programmed. Such programming may use the flow chart of Figure 5 for such software architecture.
Claims (7)
1. A searching method for a record medium having chapter number data and chapter stop data indicating the ends of the chapter number data, the method comprising the steps of searching for a desired chapter number data by coarse adjustment means and by fine adjustment means which are adapted respectively coarsely and finely to adjust the relative position, in a direction perpendicular to a record track, of a pick-up and the record medium; the step of searching by the coarse adjustment means being such that, when chapter number data reaches the desired chapter number data and a chapter stop data corresponding to the desired chapter number data is detected, driving of the coarse adjustment means is stopped; the step of searching by the fine adjustment means being such that a reproducing operation is carried out at a predetermined higher speed, to move the pick-up to a position which is immediately prior to the position of the desired chapter number data, and effecting a normal reproducing operation.
2. A method according to claim 1, wherein the step of searching by the coarse adjustment means comprises scanning the record medium in a direction opposite to data organization on the record medium.
3. A method according to claim 1 or claim 2, wherein the step of searching by the fine adjustment means comprises scanning the record medium in a direction opposite to data organization on the record medium until a chapter number scanned is smaller than the desired chapter number.
4. A method according to any one of the preceding claims, wherein the predetermined speed of the scan by the fine adjustment means occurs approximately fifteen times faster than the scanning speed of the coarse adjustment means.
5. A method of searching a record medium substantially as described with reference to Figures 2 to 5 of the accompanying drawings.
6. A searching system comprising a pick-up which is controlled by coarse and fine adjusting means arranged to carry out a method according to any one of the preceding claims.
7. Asearching system substantially as described with reference to Figures 2 to 5 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16331882A JPS5954076A (en) | 1982-09-20 | 1982-09-20 | Chapter searching method of recording medium |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8324596D0 GB8324596D0 (en) | 1983-10-19 |
| GB2130398A true GB2130398A (en) | 1984-05-31 |
| GB2130398B GB2130398B (en) | 1986-04-03 |
Family
ID=15771554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08324596A Expired GB2130398B (en) | 1982-09-20 | 1983-09-14 | Chapter searching method and system for record medium |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS5954076A (en) |
| DE (1) | DE3333932A1 (en) |
| GB (1) | GB2130398B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2623930A1 (en) * | 1987-11-27 | 1989-06-02 | Soulodre Henri Paul | HANDLING UNIT FOR AN AUDIO AND / OR VIDEO INFORMATION PLAYER, RECORDED ON A MEDIA, SUCH AS AUDIO AND / OR LASER VIDEODISC OR MAGNETOSCOPE TAPE |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6051179B2 (en) * | 1979-04-23 | 1985-11-12 | 松下電器産業株式会社 | Search method for recording disc playback device |
| JPS5611673A (en) * | 1979-07-03 | 1981-02-05 | Pioneer Video Corp | Address information retrieval method in information recording medium reproducing unit |
| DE2938842C2 (en) * | 1979-09-26 | 1982-10-21 | Institut für Rundfunktechnik GmbH, 8000 München | Method for announcing selected locations on a tape-shaped image carrier |
| JPS5750360A (en) * | 1980-08-09 | 1982-03-24 | Teac Co | Disk device |
| JPS5753879A (en) * | 1980-09-12 | 1982-03-31 | Victor Co Of Japan Ltd | High-speed searching system for reproducer of disk-shaped information recording medium |
| JPS6125103Y2 (en) * | 1980-10-13 | 1986-07-28 |
-
1982
- 1982-09-20 JP JP16331882A patent/JPS5954076A/en active Granted
-
1983
- 1983-09-14 GB GB08324596A patent/GB2130398B/en not_active Expired
- 1983-09-20 DE DE19833333932 patent/DE3333932A1/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| JPS645386B2 (en) | 1989-01-30 |
| GB8324596D0 (en) | 1983-10-19 |
| JPS5954076A (en) | 1984-03-28 |
| GB2130398B (en) | 1986-04-03 |
| DE3333932A1 (en) | 1984-03-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |