JPH0812749B2 - Track position search method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a track position searching method, and particularly to the head of a track which is in the opposite state depending on the state (recorded state or unrecorded state) of the track currently being reproduced. The present invention relates to a method for automatically searching for a position (edge) by one-key operation or command input.

BACKGROUND ART Many information recording discs (especially video discs) have information signals continuously recorded, for example, from the inner circumferential position to the outer circumferential direction of their recording area. , The recording area is divided into a plurality of areas, and it is set so that information signals (especially video signals) of a type and field assigned in advance for each divided recording area are set to be recorded so that the recorded tracks are continuous. In some cases, the recorded track group and the unrecorded track group are alternately present.

While reproducing a recorded track of such an information recording disk that has been randomly recorded, it is possible to search for the beginning position of the unrecorded track group that appears next for recording, or to reproduce from the unrecorded track position. There is a case where it is desired to retrieve the head position of the recorded track group that appears next.

Problems to be Solved by the Invention However, the search for the track position as described above is difficult without address information, and for example, a normal stop is performed and a manual stop is performed when the state changes. For this reason, it is necessary for a human to monitor the reproduced image in the conventional search for the track position.
If there is one recorded track (or one unrecorded track in the recorded track group), there is a problem in that the position of one track in a different state may be overlooked. was there. In addition, the burden on the user of the recording / reproducing device was large.

Therefore, the present invention has been made in view of the above points, and provides a track position search method capable of automatically searching for a boundary track between a recorded track and an unrecorded track by one-key operation or command input. With the goal.

Means for Solving the Problems The track position searching method of the present invention is divided into a plurality of recording areas in which the same type of information signal is recorded, and a plurality of recording areas are mixed with unrecorded tracks. The pickup that is reproducing the information recording disc is moved one track at a time in the search direction, which indicates either the normal reproduction direction indicated by the track position search instruction input or the reverse direction, and the reproduction RF signal The presence or absence of each track is detected for each track, and the detected playback RF signal is the first track position in which the pickup signal is in the opposite state to the presence or absence of the RF signal reproduced from the track currently being played by the pickup at the time of input of the search instruction input. Stop the pickup transfer and repeat the above first track.

Function When a playback RF signal is obtained because the pickup is playing a recorded track at the time of inputting the track position search instruction, the playback RF signal is first obtained by the pickup that is moved in the track position search instruction direction. The missing unrecorded track position is searched.

On the other hand, at the time of inputting the track position search instruction, if the playback RF signal is not obtained because the pickup is playing an unrecorded track, the playback RF signal is first sent by the pickup that is moved in the track position search instruction direction. The obtained recorded track position is searched. In this way, in any case, the first position of the track in a state different from the state of recording or non-recording of the track being reproduced by the pickup when the track position search instruction is input is searched.

Embodiment FIG. 1 shows a flow chart of an embodiment of the method of the present invention, and FIGS. 2 and 3 show a flow chart of an embodiment of each element of FIG.

The operation according to the flowcharts shown in FIGS. 1 to 3 is performed by the system controller 1 in the block system diagram of the recording / reproducing apparatus shown in FIG. The system controller 1 is constructed as shown in FIG. Therefore, first, an outline of a recording / reproducing apparatus to which the present invention can be applied will be described with reference to FIGS. 4 and 5. First, at the time of recording, any one of a VTR and a television camera is operated by the switches 2 and 3. The video signal and the audio signal taken out from are selected and supplied to the modulator 6 through the video processor 4 and the audio processor 5 separately, where they are modulated into a predetermined signal form, and then through the LD driver 7. Then, it is applied to a laser diode (LD) and its light intensity is changed according to information. The light from the LD is irradiated onto an optical disc (not shown) as an example of the information recording disc for recording.

This optical disc has a sync signal generator 10, a phase comparator 11,
It is synchronously rotated by a disk motor 14 which is supplied with signals from an equalizer 12 and a driver 13. Also, LD
The driver 7 is attached to the optical base 9 together with the head amplifier 8, and the optical base 9 is moved by the step motor 31 in a fixed direction during recording.

Next, at the time of reproduction, the reproduction RF signal obtained by detecting the change in the light intensity of the reflected light from the optical disk passes through the head amplifier 8 and the RF amplifier 15, respectively, and the audio demodulator 16, the Y demodulator 17, and the C demodulator 18 are reproduced. , And the audio signal, the luminance signal, and the carrier color signal are respectively demodulated. The reproduction luminance signal is supplied to the video processor 19 together with the reproduction carrier color signal, and is outputted as a reproduction color video signal of a predetermined signal form here, while the SYNC separator 20 separates and extracts the synchronization signal and the phase comparator 11 Is supplied to.

Further, the reproduced RF signal is supplied to the RF detection circuit 21, detected here, and then supplied to the system controller 1.
Further, the signal from the head amplifier 8 obtained based on the reflected light of the sub-light beam different from the main light beam for recording / reproducing the information signal is recorded on the optical disk by the focus servo circuit including the equalizer 22, the driver 23 and the pull-in circuit 24. The light beam is focused and focused on. The pull-in circuit 24 is a circuit that operates when pulling in the focus servo circuit. When the focus servo is closed loop, the driver 23 is vibrated in a predetermined cycle, so the peak of the output of the head amplifier 8 at that time is detected. It detects and stops the vibration and makes the servo into a closed loop.

The output signal of the head amplifier 8 is supplied to a tracking servo circuit including an equalizer 25, a driver 26 and a jump circuit 27, where it is converted into a tracking error signal and supplied to the optical base 9. The tracking servo circuit and the focus servo circuit operate not only during reproduction but also during recording.

Further, the output signal of the driver 26 is a radial processing circuit.
It is supplied to the step motor 31 through the counter 28, the counter 29 and the driver 30, respectively, and controls the operation thereof. The radial processing circuit 28, when the output voltage of the driver 21, which is the drive voltage of the rotating mirror, becomes equal to or higher than a predetermined level, the step motor
31 is driven to move the entire optical base 9 in the radial direction of the optical disc. Thus, the rotation mirror is always controlled to rotate around the neutral position.

The drawer unit 32 lowers the disc tray based on the signal obtained by detecting that the disc tray is closed by the various signal detectors 34, clamps the optical disc on the turntable, and vice versa. The signal is detected by the various signal detectors 34 that the disc is turned on, and the disc tray is raised by the obtained signal to eject the disc. In addition, the mode and the like of the recording / reproducing apparatus are displayed on various display devices 33.

The regulator 38 supplies a DC power supply voltage to each part of the device. The system controller 1 has an external pulse input section 35,
A signal is also supplied from the interface 36 and the sensor 37.

As shown in FIG. 5, the system controller 1 has a central processing unit (CPU) 40, and a pulse generator 42, a random access memory (RAM) 43, a read only memory (ROM) via a bus line 41. ) 44, counter, timer,
A circuit (CTC) 45, an interface 46 corresponding to the interface 36, a real-time clock 47, a battery backup 48, and an I / O unit 49 are connected to each. The pulse generator 42 generates a system reset pulse and a system clock pulse. CTC45 generates an interrupt by a timer and a counter. Real time clock 47
Generates clocks for year, month, day, hour, minute, second, and calendar.

The I / O unit 49 corresponds to a drawer control 50 that controls the drawer unit 32, a display unit 51 that configures various display units 33, a SW type detector 52, a controller 53 for controlling the step motor 31, and a sensor 37. The remote control sensor 54, each servo control 55, and various signal detectors 56 corresponding to the various signal detectors 34 are connected.

Next, examples of the present invention will be described. When an interface command is input through the remote control key (sensor 37) or the interface 36 while the recording / reproducing apparatus shown in FIG. 4 is in the reproduction mode, the system controller 1 follows the flow chart shown in FIG. Whether the input is detected in step S ₁ and the instruction input thereby searches the forward edge (that is, the track at the boundary between the unrecorded track and the recorded track) (step
S _2), it is determined whether to search a backward edge (Step S _3). Here, the "forward direction" means the same direction as the normal playback direction from the track position during playback of the pickup at the time of the above key input or command input, and "reverse direction" means the normal playback direction. And the opposite direction.

In either direction, when there is a search input, the RF that detects from the reproduction signal envelope whether the reproduction RF signal (this is usually an FM signal) is first obtained from the pickup of the information recording disk. determining on the basis of the output detection signal of the detection circuit 21 (step S _4, S _5). Because when the reproduction RF signal is not the current pick-up playback position is an unrecorded track, to search for leading position of the recorded track of the different states from this (step S _6, S _7). On the other hand, since when the reproduction RF signal is present the current pick-up playback position is the recorded tracks, to search for leading position of the unrecorded track different states from this (step S _8,
S ₉ ).

When the search for the head position of the recorded track or the unrecorded track is completed, the system controller 1 terminates this search operation (edge search), enters the still mode, and then displays a message such as the end of edge search ( Step S ₁₁ ). There are several possible modes after the search, and the still mode after the search operation,
There is one recorded or unrecorded track searched (1
This is because it is necessary to surely secure the target track even if there is only one rotation track). Then, the mode shifts to each mode (step S ₁₂ ). Incidentally, when it is determined that there is no search input in both steps S ₂ and S _3, to perform the operation mode that is any instruction (step S _13).

Will now be described in further detail search operation of the head position of the recorded track or the unrecorded track in the above Step S ₆ to S _9. To search for the beginning position of a recorded track,
As shown in FIG. 5, first, one track jump is performed to reproduce the track (step S ₁₅ ), and after an extremely short time delay required for stabilizing the circuit operation of the RF detection circuit 21 and the like (step S ₁₅ ). _16), to determine the presence or absence of the reproduction RF signal from the track jump (step S _17). Because when the reproduction RF signal is not reproduced track is an unrecorded track, until the reproduction RF signal is detected, and repeats the determination of the jump reproduction RF signal of the track of the one track (step S ₁₅ to S ₁₇₎ .

Here, the jump direction of the track is set to the forward direction by the forward edge search input in the case of step S ₆ in FIG. 1, and is set to the reverse direction by the backward edge search input in the case of step S _7. To be done. In this way, when the first recorded track after the unrecorded track group is detected,
The system controller 1 puts the apparatus in the still mode (step S _{18 in} FIG. 2), repeatedly reproduces the first recorded track, and reproduces and detects the address signal of the track to confirm the address (step S ₁₉ ). .

Thus, for example, normal reproduction is performed from the inner circumference to the outer circumference on the information recording disk 60 shown in FIG. 6, and the unrecorded track group 62 adjacent to the continuously recorded recorded track group 61 is unrecorded. When, for example, a forward key input or a command input for edge search is performed during reproduction of the track t ₁ , the pickup is jumped one track at a time in the forward direction, and the next one previously recorded track (or The first recorded track) 63 in the next recorded track group is stopped, and this recorded track 63 is repeatedly reproduced.

In this way, when it is not known where the information signal to be reproduced next is recorded, the next recorded track can be automatically searched, so that the information signal recorded next can be easily reproduced. Even one recorded track 63 between the unrecorded track groups 62 and 64 can be accurately searched.

Next, the search operation of the head position of the unrecorded track in steps S ₈ and S ₉ will be described. As shown in FIG. 3, one track jump, delay of time required for stabilizing the circuit operation,
And the detection of the reproduction RF signal from the track jump is repeated until the reproduction RF signal can not be obtained (step S ₂₁ ~S _23). Similar to the case described above, the jump direction of this track is forward in the case of step S ₈ and reverse in the case of S ₉ . Then, the still mode is set at the position of the unrecorded track where the reproduction RF signal is not first obtained, and the address is confirmed (steps S ₂₄ and S ₂₅ ).

As a result, for example, the recorded tracks which are being normally reproduced from the inner circumference to the outer circumference of the recorded track group 71 continuously recorded and formed on the information recording disk 70 shown in FIG.
When the edge search operation is performed at the position of t ₂ , the pickup is jumped forward one track at a time, and the first unrecorded track of the unrecorded track group 72 adjacent to the outer peripheral side of the recorded track group 71. The transfer is stopped at the position of t ₃ , the unrecorded track t ₃ is repeatedly reproduced, and its address is confirmed.

As a result, when recording is started from the first unrecorded track of the unrecorded track group next to the recorded track group currently being reproduced, the position of the first unrecorded track is automatically and accurately determined. You can search for.

Thus, for example, if it is desired to search for the head position of the next recordable unrecorded track following the information signal of the recorded track group currently being reproduced, but the address is not known, one key during reproduction of the recorded track The start position of the next unrecorded track can be automatically searched by an operation or command input.

EFFECTS OF THE INVENTION As described above, according to the present invention, one recorded track in the unrecorded track group and one unrecorded track in the recorded track group are in the state of the track currently being reproduced (unrecorded state). It is possible to easily detect not only in the normal reproduction direction but also in the reverse direction by one key operation or command input according to the recorded state), and reproduction of the information recording disk in which the recorded tracks are formed discretely. Sometimes an unrecorded track can be skipped and the beginning position of the next recorded track can be quickly searched to replay the recorded tracks sequentially. Only when the signal should be recorded, the head position of the recording track can be quickly searched. In addition, even if the recorded track searched by repeatedly reproducing the first track position in the opposite state has only one still image signal recorded therein, it can be reliably searched. The recorded tracks can be sequentially reproduced.

[Brief description of drawings]

FIG. 1 is a flow chart showing an embodiment of the present invention,
FIG. 3 and FIG. 3 are flowcharts of essential parts in the flowchart shown in FIG. 1, respectively, FIG. 4 is a block system diagram showing an example of a recording / reproducing apparatus to which the present invention can be applied, and FIG. 5 is a block system shown in FIG. FIG. 6 is a block diagram showing an example of the system controller in FIG. 6, and FIGS. 6 and 7 are diagrams for explaining each example of the track position search in the present invention. 1 ... System controller, 21 ... RF detection circuit, 40 ... CPU
(Central processing unit), 60, 70 ... Information recording disk, 61, 71 ... Recorded track group, 62, 64, 72 ... Unrecorded track group, S _{1 to} S ₁₃
… Step.

Claims (1)

[Claims] 1. An information recording disk is divided into a plurality of recording areas in which the same type of information signal is recorded, and an information recording disk in which recorded tracks and unrecorded tracks are mixed is reproduced in each of the plurality of recording areas. The pickups are moved one track at a time in the search direction, which indicates either the normal playback direction indicated by the track position search instruction input or the reverse direction, and the presence or absence of a playback RF signal is detected for each track.
Stop the transfer of the pickup at the first track position where the detected reproduction RF signal is in a state opposite to the presence or absence of the RF signal reproduced from the track being reproduced by the pickup at the time of inputting the search instruction input. Then, the track position searching method is characterized in that the first track is repeatedly reproduced.