JPH0298877A - Searching method for optical disk player - Google Patents

Abstract

PURPOSE:To search for a desired track position speedily by returning to a track jump which is one rank higher than a current track jump unless a next track jump is made even if one track jump is repeated specific times. CONSTITUTION:The CPU in a system controller 10 calculates the number of tracks present between a track position A and a desired track position B on a CD1 by using a calculation table. There are four kinds of track jumps, i.e. 125, 25, 5, and 1-track jumps of power of 5. When each track jump operation is performed successively >=10 times, it is judged that vibration is applied in the middle from outside or that disturbance such as the presence of a flaw on the CD1 is generated and a return to a track jump which is one rank higher than each track jump is made. Consequently, the search is made in a short period.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a search method for an optical disc player used for music reproduction or the like.

"Prior Art" Fig. 2 is a block diagram showing an example of the configuration of a conventional compact disc player.
TOC such as the absolute start time of each side recorded in
(Table Or Contents) information is recorded. 2 is a spindle motor that rotationally drives the CDI, 3 is an optical pickup that uses a laser beam to read digital information recorded in bits on the signal recording surface of the CDI, and 4 is a feed motor that moves this optical pickup 3.

Further, 5 is an RF amplifier that generates and outputs a focus error signal and a tracking error signal from the read signal output from the optical pickup 3, and also amplifies and outputs this read signal, and 6 is an RF amplifier that outputs the signal from the RP amplifier 5. A data processor performs processing such as signal demodulation, code error correction and correction, 7 is a DA converter that converts the digital signal output from the data processor 6 into an analog audio signal, and 8 is amplification and sound quality control for this audio signal. The output signal of this audio circuit 8 is outputted to an external speaker or the like via an audio output terminal 9. ,
lO is a system controller, which includes the epuc central processing unit), the ROM 11 in which programs used in this CPLI are stored, and r (AM
I2 and i, 10 (in/out) boats or l-1 are configured. 13 is a focus adjustment control (focus servo) of the optical pickup 3 under the control of the system controller IO using the ``''orcus error signal and tracking signal outputted from the 1F amplifier 5.
and tracking adjustment control (tracking servo), and feed adjustment control of feed motor 4 (feet servo)
and a servo processor that performs constant linear velocity control (spindle servo) of the spindle motor 2.

Now, the linear velocity is V. (a+/S), the track pitch is p (μ scale), and the innermost radius of the program area is r.

(ms), the radius of the track position corresponding to the currently playing song is r (am), and the absolute time of the currently playing song is L (sea), there is a relationship between these as shown in the following equation. There is.

[π(r'-ro")/p= voL...(+
) In this equation (1), Vo = 1, 3a/s, p□
= 1, 611m.

Substituting r, = 25mI11, r = 625 + 0. 66t ・ ・ ・ (2)
becomes.

Also, CD1. , , let the radius of the track position at two arbitrary points be r + (am) and r, (IIlm), respectively.
Then, the track @N existing between these two points is expressed by the following equation.

N=(ri yz)/p・・・・(3) Therefore,
From equations (2) and (3), CI) 1. , J-, and find the number of tracks existing between these two points from the absolute time.

Then, the calculation 7--pull of these two equations is stored in the ROλ, 111 in the system controller 10.

On the other hand, when a CD 1 is set in the compact disc player and the power is turned on, TOC information is read from the CD 1 by the optical pickup 3 and stored in the RAM 12i in the system controller IO.

As a result of the above, the desired song is moved from the track position point A corresponding to the currently playing song shown in FIG. ), the CP LJ in the system controller 10 first searches for track position ffi' on CD 1F.
The number of tracks existing between point A and track position [] is calculated using the calculation table described above.

Next, while processing the signal read by the optical pickup 3 and counting the number of tracks from the CD 1-in track position HA point, the optical pickup 3 is moved by the feed motor t to a position near the rank R8 point. Move (step ■) 4 degrees. Next, drive the tracking actuator of the optical pickup 3 to move L2.
Perform 5 track jumps several times and pass 8 track positions (step ■) 6. Next, drive the tracking actuator of optical pickup 3 in the opposite direction and perform 25 track jumps several times. Track ti'7-K Point B is set a (step ■).

Furthermore, the actuator for the track>/ge of the optical pickup 3 is driven in the opposite direction again, and 5)-rasok jump is performed several times to pass the track position (2) (step (2)).

Finally, the tracking actuator of the optical pickup 3 is driven 17 again in the opposite direction and one track jump is performed several times to reach the track position l (step ■) 7. [Invention Problem 1 to be Solved By the way, in the conventional servo method of the optical disc drive mentioned above, external vibrations and CD
Due to scratches on the I, L-, the optical pickup 3 moves from the track position 13 corresponding to the desired song to the 4L position, and then steps again. If the method had to be changed from step 2, etc., there was a drawback that it would take time to reach the 8th track position.

This invention was made in view of two consecutive circumstances, and is a search method for an optical disc player that can perform a search in a short time even if there are external vibrations or scratches on the CD during the search. is intended to provide.

"Means for Solving the Problem" The present invention provides a search method for an optical disc player in which a desired track position is searched by sequentially transitioning from jumps with a large number of tracks to jumps with a small number of tracks. If the jump does not move to a jump one rank lower even after repeating the jump a predetermined number of times, the jump returns to a jump one rank higher than this jump.

"Operation" According to the present invention, when one track jump is repeated a predetermined number of times but does not proceed to the next track jump, the track jump is returned to the one rank higher than the current track jump, so the desired track position can be quickly moved. You can search for

"Embodiment" Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, the configuration of the compact disc player is the same as the conventional technology described above, and the search method also uses 125 track jumps, 125 track jumps,
25 track jump, 5 track jump and 4N class with 5 times increments of I track jump. moreover,
The number of consecutive track jumps during the search is set to a maximum of 5 times. In addition, if each of the track jump operations described above is performed ten or more times in a row, it is determined that a disturbance has occurred, such as external vibrations or scratches on the CDl. Then, the track jump is set to return to a track jump that is one rank higher than each track jump. System controller 1
It is stored in advance in ROMII in 0.

In such a configuration, in order to search from track position A point corresponding to the currently playing song shown in FIG. 1 to eight track positions corresponding to the start part of a desired song, the CPU in the system controller 10 First, the number of tracks existing between track position A point and track position 8 on CDl is calculated using the above-mentioned calculation table.

Next, the optical pickup 3 is moved to the vicinity of the track position atB by the feed motor 4 while processing the signal read by the optical pickup 3 and counting the number of tracks from the track position A on the CDl. ).

Next, the tracking actuator of the optical pickup 3 is driven to perform 125 track jumps several times to pass eight track positions (step (2)).

Then, the tracking actuator of the optical pickup 3 is driven in the opposite direction to perform 25 track jumps several times to pass eight track positions (step 2).

Furthermore, the tracking actuator of the optical pickup 3 is driven in the opposite direction again to perform 5 track jumps several times and pass through 8 track positions (step
). At this time, it is assumed that these five tracks are performed ten times or more consecutively. As a result, the CPU in the system controller 10 determines that a disturbance has occurred, such as external vibrations or a scratch on the CDl, and returns to step (3).

In step (2), the tracking actuator of the optical pickup 3 is driven in the opposite direction to perform 25 track jumps several times to pass eight track positions.

Furthermore, the tracking actuator of the optical pickup 3 is driven in the opposite direction again, and the 51-rack jump is performed several times to pass eight track positions (step (2)).

And finally, drive the tracking actuator of optical pickup 3 in the opposite direction again! Perform track jump several times to reach track position 8 (step ■).

In addition, in the above explanation, each track jump is 51
8 increments 5 and 1. Ka-'F, h Trattan Noyan Bu is I l) If you fail 17 in the same consecutive 1~, it was called Nira-, but Tani Tora! r! Jump 1 times) Gimitoshi 1, or each Tora Nori jump or 2n times consecutively 13. and failed,
In addition, in the above explanation, the foot motor 1 is used in the (0 step/rb) of the search, but it is also possible to perform a 125 tora/nori jump directly. .

Furthermore, the method of 52 can also be used to find the beginning of a song by searching (other than 9) for recovery processing when the tracking or focus servo is off.

Incidentally, one embodiment of the series is a compact disc player for ordinary Onryo Redo, or the present invention is a CD-R
OM,,CD-V (Compact Disc Video)
, CD-1 (Compact Disc Interacitive Media), I, D (Laser Disc), etc. can also be applied.

``Effects of the Invention'' As explained below, according to the present invention, even if there is external vibration or damage from the cnI during the search, the search can be performed in a short time. There is a 2JJ village called Okoto or Gosaru51. 1 Ii of the drawing? Brief Explanation Figure 1 shows a conventional example and an embodiment of the present invention.
Fig. 4 and Fig. 2 are the conventional example and the present invention (S). FIG. 2 is a block diagram showing an example of a compact disk drive (:v)4M1 to which the search method is applied. , 1...Compact Disc, 10 Nosu"
Ay:]〉・! ·roller.

Claims (1)

[Claims] In a search method for an optical disc player in which a desired track position is searched by sequentially transitioning from a jump with a large number of tracks to a jump with a small number of tracks, even if any jump among the plurality of jumps is repeated a predetermined number of times, the position of A search method for an optical disc player, characterized in that when the jump does not occur, the process returns to a jump one rank higher than the jump.