JP2000298849A - Control method for compact disk player - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control method, for a CD player, in which a pickup is returned again to a signal recording region in a short time and in which the control of a beginning operation or the like can be continued even when the pickup springs out to the outside of either an inner-circumferential-side signal recording region or an outer-circumferential-side signal recording region due to a flaw or a vibration during a track jump. SOLUTION: While a track jump is being executed for the beginning operation of an arbitray piece of music in a compact disk player, a pickup springs out to the outside of a signal recording region due to a flaw on track jump routes formed radially from the center of a disk or due to a vibration by which tracks crossed by the pickup cannot be counted. At this time, it is recognized after the elapse of a set time that the track jump the failed, and the track jump is stopped (13) at a timing which is faster than an ordinary control timing which stops (11) the track jump.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a compact disk (hereinafter referred to as CD) player, and more particularly to a method for controlling scratches and vibrations during a track jump.

[0002]

2. Description of the Related Art A method for controlling scratches and vibration during a track jump in a conventional CD player will be described below with reference to the drawings. FIG. 4 shows conventional and inventive CDs.
FIG. 7 is an explanatory diagram of time required for processing in a player control method, FIG. 7 is a block diagram showing a basic configuration of a CD player device to which a conventional CD player control method can be applied, and FIG. 8 is cueing control by the device shown in FIG. FIG. 10 is a flow chart of a conventional cueing control method, and FIG. 9 is a diagram showing a conventional method for controlling cueing, which shows scratches and vibrations during a track jump for avoiding scratches on a conventional reproduction path. And FIG. 11 is a flowchart of the control method shown in FIG.

In FIG. 7, 1 is a CD, 2 is a pickup, 3 is a feed motor, 4 is a spindle motor, 5 is an RF amplifier, 6 is a motor driver, 7 is a DSP (dig).
8 is an CPU (ital signal processor).

In this configuration, the CPU 8 controls the pickup 2 via the DSP 7 to trace a signal sequence recorded as a single spiral track from the inner peripheral side to the outer peripheral side of the CD 1 to realize a reproducing operation. Let me. During the reproduction of the CD 1, the CPU 8 reads out the position information of the pickup 2 called the subcode from the DSP 7, and the subcode indicates the position on the signal sequence traced by the pickup 2 from the reproduction start point on the innermost circumference. Since the time is represented by time, when cueing an arbitrary music, the CPU 8 calculates the number of tracks to be jumped from the subcodes of the current position and the target position, performs a track jump, and can perform cueing. Is configured.

When executing the track jump for the head search, as shown in FIG. 8, a track 38 having a scratch 38 on a track jump path formed radially from the center of the CD 1 or a track crossed by the pickup 2 is used. If a vibration that makes it impossible to count occurs, the number of tracks to be jumped may be erroneously counted and the pickup 2 may be moved beyond a correct distance. If the destination is a signal recording area, a track jump is started again from that location to bring the pickup 2 close to the target position. However, if such an event occurs near the innermost circumference and the outermost circumference of the CD 1, The pickup 2 jumps out of the signal recording area.

When the pickup 2 jumps out of the signal recording area, the DSP 7 cannot complete the track jump, and the CPU 8 does not complete the track jump within a predetermined time. Stop 11 ", the rotational speed of the CD 1 attenuated until the track jump was stopped was increased, and then" focus re-pull-in "12 was performed at that location by a feedback method using a signal from the RF amplifier 5.

FIG. 10 shows the flow of the software of the CPU 8 at this time. First, after "track jump activation" 40, it is monitored whether or not the track jump has been "normally completed" 41. To check the focus state. If the focus is not out of focus, the process ends. If the focus is out of focus, “focus re-pulling” 45 is performed. If the track jump does not end normally, the "timeout" 42 is monitored, and if it is time out, the track jump is stopped by the "track jump stop" 43 to check the focus state.

Next, a track jump for avoiding a scratch on the reproduction path will be described. In this case, as shown in FIG.
When a track jumps to the inner peripheral side of D1, the CPU
Numeral 8 instructs the DSP 7 to perform a track jump in order to skip the scratch and continue the reproduction. Then pick up 2
Is forcibly moved by the time required to reach the nearest signal recording area in the direction opposite to the direction of the executed track jump, and the focus is redrawn to continue the reproduction of the scratched disk.

FIG. 11 shows the flow of software of the CPU 8 at this time. First, the CPU 8 executes "return of subcode".
After confirming the step 46, a "track jump start" 47 is performed, and then the subcode is read, and the "subcode has advanced" 48 before the track jump is confirmed. If the sub-code has not progressed, it is checked whether or not “the specified number of track jumps has been performed” 49. After the execution of the traverse feed, the subcode is confirmed at "the subcode has advanced" 51, and the reproduction of the damaged disk is terminated if the subcode has been advanced from before the reproduction of the defective disk. If it has not proceeded, the state of focus is confirmed in "out of focus" 52, and the reproduction of the scratched disk is terminated.

[0010]

However, in the above-described control method, the time until the track jump is stopped is long, and the rotation speed of the disk is greatly reduced. There is a problem that it takes time, and it takes time to pull in the focus in the feedback refocusing by the feedback method using the signal from the RF amplifier outside the signal recording area.

The present invention solves the above-mentioned conventional problems. The conventional method can be used even if the pickup jumps out of the signal recording area on either the inner side or the outer side due to a scratch or vibration during a track jump. It is another object of the present invention to provide a control method for a CD player that can return a pickup to a signal recording area again in a shorter time and continue control such as cueing.

[0012]

SUMMARY OF THE INVENTION A compact disk player control method according to the present invention is directed to a method in which a track formed radially from the center of a disk is executed during a track jump for searching for an arbitrary song in the compact disk player. When the pickup jumps out of the signal recording area due to a scratch on the jump path or a vibration that makes it impossible to count the tracks crossed by the pickup, it recognizes that the track jump has failed after a certain period of time and stops the track jump. The track jump is stopped at a timing earlier than the normal control timing.

According to the present invention, even if the pickup jumps out of the signal recording area at the time of a track jump for cueing near the inner circumference or the outer circumference or a track jump for controlling playback of a scratched disc, the conventional technique can be used. Pull back the pickup into the signal recording area in a shorter time compared to the method of
The act before jumping out can be continued.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. Note that the same reference numerals are used for the same parts as those of the conventional one.

(Embodiment 1) FIG. 1 shows a CD according to Embodiment 1 to which the method of controlling a CD player according to the present invention can be applied.
FIG. 2 is a block diagram showing a basic configuration of the player device, and FIG.
And FIG. 5 is a flowchart of the control method shown in FIG.

When searching for the beginning of an arbitrary song on CD1, the CPU
Numeral 8 calculates the number of tracks to be jumped from the subcodes at the current position and the target position, and instructs the DSP 7 to perform a track jump. Due to scratches 9 and vibration during track jump,
When the pickup 2 jumps out of the signal recording area, FIG.
As shown in (b), the CPU 8 obtains information of out-of-focus from the DSP 7 and instructs the DSP 7 to "stop track jump" 13 and performs "re-focusing" 12. Thereafter, as shown in FIG. 4C, the pickup 2 is forcibly moved in the direction opposite to the direction of the executed track jump by the time required to reach the nearest signal recording area, and "focus re-pulling" 16 is performed. Continue cueing.

FIG. 5 shows the flow of software of the CPU 8 at this time.
If "out of focus" 18 is not out of focus,
It monitors whether or not the track jump is completed in "normal end" 19, and when it is completed, checks the focus state again in "out of focus" 22. If it is not out of focus, it ends as it is. If the focus is out of focus, "focus re-pulling" 23 is performed. If the track jump does not end normally, the "timeout" 20 is monitored, and if it is time out, the "track jump stop" 21 stops the track jump and confirms the focus state.

As described above, according to the present embodiment, during the execution of the track jump for arranging the beginning of an arbitrary piece of music, a scratch on the track jump path formed radially from the center of the disk, a pickup, etc. When the pickup jumps out of the signal recording area due to the vibration that makes it impossible to count the tracks that traverse, the track jump can be stopped earlier than the stop of the track jump due to the failure of the track jump after a certain period of time Therefore, as shown in FIG. 4B, subsequent focus re-pulling can be performed in a shorter time than in the conventional method.

Further, the pickup is forcibly moved for a predetermined time in a direction opposite to the direction in which the track jump is executed, and the focus re-pulling is performed at the position after the forcible movement. This can be done in a shorter time.

(Embodiment 2) FIG. 3 shows a control method for avoiding scratches on the reproduction path in the embodiment 2 of the CD player apparatus shown in FIG. 1 to which the CD player control method of the present invention can be applied. FIG. 6 is a flow chart of the control method shown in FIG.

As shown in FIG. 3, when the pickup 2 causes a track jump to the inner peripheral side of the CD 1 due to the scratch 10 on the reproduction path, the CPU 8 jumps the track to the DSP 7 to jump over the scratch and continue the reproduction. To instruct. When the pickup 2 jumps out of the signal recording area due to a scratch or vibration during the track jump, the CPU 8 obtains information of the out of focus from the DSP 7 and instructs the DSP 7 to stop the track jump. Thereafter, the pickup is forcibly moved in the direction opposite to the direction of the executed track jump by the time required to reach the nearest signal recording area, and the focus is redrawn to continue the reproduction of the scratched disk.

FIG. 6 shows the flow of software of the CPU 8 at this time. First, when the pickup 2 jumps a track toward the inner circumference side of the CD 1, the CPU 8 returns "Yes" at "sub code return" 26, “Out of focus” during track jump with “Track jump start” 27
At step 8, the focus pull-in state is monitored, and as soon as the focus is lost, the track jump is stopped at "stop track jump" 36. In addition, the DSP “Forced movement of pickup in the opposite direction to track jump” 37
Instruct 7. After the completion of the forced movement, the focus is redrawn, and the process proceeds to “the subcode has advanced” 29.

If the focus is not lost during the track jump, the sub-code is read and it is checked whether "the sub-code has advanced" 29 before the track jump. If the subcode has not progressed, check “Track jump specified number of times” 30 and
After performing the prescribed number of times, “pickup forced movement by traverse feed” 31 is performed. After the execution of the traverse feed, the sub-code is confirmed in "the sub-code has advanced" 32, and the reproduction of the flawed disk is terminated if the sub-code has advanced from before the reproduction of the flawed disk. If it is not proceeding, the focus state is confirmed by out-of-focus 33, and if it is not out of focus, the track jump is stopped by "stop track jump" 34, and "the pickup is forcibly moved in the direction opposite to the track jump" 35. To end the scratch disc playback.

As described above, according to the present embodiment, the pickup is moved out of the signal recording area during the track jump to avoid the damage on the reproduction path and to continue the reproduction from the position beyond the damage. When jumping out, the track jump can be stopped earlier than when the track jump is stopped by recognizing that the track jump has failed after a certain period of time,
As shown in FIG. 4C, subsequent focus re-pulling can be performed in a shorter time than in the conventional method.

Further, the pickup is forcibly moved for a predetermined time in a direction opposite to the direction in which the track jump is executed, and the focus is redrawn at the position after the forcible movement. This can be done in a shorter time.

[0026]

As described above, according to the present invention, the inner circumference,
Even if the pickup jumps out of the signal recording area during a track jump for cueing near the outer circumference or a track jump for playing back a scratched disc, the signal is recorded in a shorter time than the conventional method. The advantageous effect of returning to the area and continuing the action before jumping out is obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a basic configuration of a CD player device according to a first embodiment to which a CD player control method according to the present invention can be applied;

FIG. 2 is a schematic explanatory diagram of a cueing control method by the device shown in FIG. 1;

FIG. 3 is a schematic explanatory diagram of a control method for avoiding a scratch on a reproduction path in the second embodiment of the CD player device shown in FIG. 1 to which the CD player control method of the present invention can be applied.

FIG. 4 is an explanatory diagram of the time required for processing in the conventional and inventive CD player control methods.

FIG. 5 is a flowchart of a cueing control method by the apparatus shown in FIG. 2;

FIG. 6 is a flowchart of a control method shown in FIG. 3;

FIG. 7 shows a C to which a conventional method of controlling a CD player can be applied;
Block diagram showing a basic configuration of a D player device

8 is a schematic explanatory diagram of a cueing control method using the conventional device shown in FIG.

FIG. 9 is a schematic explanatory view of a conventional control method for scratches and vibration during a track jump for avoiding scratches in a reproduction path.

FIG. 10 is a flowchart of a control method shown in FIG. 8;

FIG. 11 is a flowchart of the control method shown in FIG. 9;

[Explanation of symbols]

 1 CD 2 pickup 3 feed motor 4 spindle motor 5 RF amplifier 6 motor driver 7 DSP 8 CPU

Claims (3)

[Claims] 1. During execution of a track jump for searching for an arbitrary song in a compact disk player, it is impossible to count a scratch on a track jump path formed radially from the center of the disk or a track traversed by a pickup. When the pickup jumps out of the signal recording area due to the vibration, it recognizes that the track jump has failed after a certain period of time, and stops the track jump earlier than the normal control timing for stopping the track jump. A method for controlling a compact disc player, characterized by the following. 2. During the execution of a track jump for finding the beginning of an arbitrary song in a compact disc player, it is impossible to count the scratches on the track jump path formed radially from the center of the disc and the tracks traversed by the pickup. By the vibration to be caused, when the pickup jumps out of the signal recording area, the pickup is forcibly moved for a predetermined time in a direction opposite to the direction in which the track jump is executed after stopping the track jump,
A method of controlling a compact disc player, wherein focus re-pulling is performed at a position after forced movement. 3. During execution of a track jump for avoiding a scratch on a reproduction path in a compact disc player and continuing reproduction from a position beyond the scratch, a scratch to be avoided causes a disc on the track jump path to move along the track jump path. When the pickup jumps out of the signal recording area because it is formed radially from the center to the outermost circumference, it recognizes that a track jump has failed after a certain period of time, and normal control to stop the track jump After stopping the track jump at a timing earlier than the timing, forcibly move the pickup for a certain time in the direction opposite to the direction in which the track jump was executed,
A method of controlling a compact disc player, wherein focus re-pulling is performed at a position after forced movement.