JP2003249024A - Optical disk player - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk player, by which a playback signal exactly following a signal instructing the playback is obtained. <P>SOLUTION: This player is furnished with a read means for reading recording data recorded on the optical disk, a storage means for temporarily storing the recorded data read by the read means along with data of the recorded position showing the recorded position of the recorded data on the optical disk, an input means of playback instructing signal for producing and inputting the playback positional information which shows the position to be played back on the basis of the a signal showing the read direction of the recorded data stored in the storage means, the read speed and the read starting position, and a control means for respectively controlling the above read means, the storage means and the input means of playback instructing signal. Then, by the control means, the playback positional information of the recorded data to be actually played back on the basis of the updated information of the playback signal is computed, and the playback position is corrected on the basis of a deviation signal between the computed result and the playback positional information for showing the position to be played back. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk reproducing apparatus, and more particularly to an optical disk reproducing apparatus capable of performing special reproduction.

[0002]

2. Description of the Related Art Conventionally, as a special reproduction method of an analog disk, an analog disk (record disc) is reproduced by a normal analog disk player, and during this reproduction, for example, a disk jockey (DJ) points to a turntable of the analog disk player. There is known a reproduction method of performing "brake effect reproduction" in which the rotation is gradually stopped by pressing with, or "scratch reproduction" in which the turntable is rapidly rotated in the forward and reverse directions to reproduce a rubbing sound.

In recent years, optical discs have become popular in place of the analog discs. Along with this, there has been developed an optical disk reproducing apparatus that can apply special reproduction that has been performed by mechanical operation of the turntable to an optical disk (for example, see Japanese Patent Laid-Open No. 7-29183).

Further, Japanese Patent Laid-Open No. 2001-31857 discloses an optical disk reproducing device capable of performing the scratch reproduction. This device is provided with a memory for storing reproduction data of an optical disk and a jog dial operated by a DJ or the like. When performing scratch reproduction, first, reproduction data of the optical disc is temporarily stored in the memory and then read according to the operation of the jog dial. At this time, the optical disk reproducing apparatus detects the rotation direction and the rotation speed of the jog dial, determines the reading direction from the memory according to the detected rotation direction, and determines the reading speed from the memory according to the detected rotation speed. . As a result, a reproduced sound similar to a rubbing sound can be obtained.

[0005]

In the conventional example, as a method for detecting the rotating direction and the rotating speed of the jog dial, the jog dial is provided with a switch for switching on and off when the jog dial is rotated, and the switch is switched within a predetermined time. The number of times of detection is detected, and the reproduction speed is changed based on the detected number of times of switching.

Therefore, when the rotation direction of the jog dial is reversed depending on the detection sensitivity of the switch (minimum detected rotation angle) or the setting method of the predetermined time, there is a time delay until it is recognized that the rotation is actually reversed. Or
Alternatively, a time delay may occur in obtaining the reproduction speed according to the number of times the switch is switched.

When the jog dial is rotated once to the right and then rotated once to the left while changing the speed at which the jog dial is rotated, the deviation of the range of the output sound is accumulated, and the analog disk player is It becomes difficult to make the range of the output sound constant as in the case where the same operation is performed using the same.

The present invention has been made in view of the above problems, and provides an optical disk reproducing apparatus capable of obtaining a reproduction signal that accurately follows a signal instructing reproduction.

[0009]

The present invention adopts the following means in order to solve the above problems.

The reading means for reading the recording data recorded on the optical disc, the storing means for temporarily storing the recording data read by the reading means together with the recording position data indicating the recording position of the recording data on the optical disc, and the storing means. Reproduction instruction signal input means for generating and inputting reproduction position information indicating a position to be reproduced based on a signal indicating a read direction, a read speed and a read start position of the recorded data, and the reproduction position signal based on the reproduction position information. The reproduction output means outputs the recording data stored in the storage means as a reproduction signal, and the control means for controlling the read-out means, the storage means and the reproduction instruction signal input means, respectively. The control means outputs the reproduction output means. Calculate the playback position information of the recorded data that is actually played based on the update information of the playback signal , To correct the reproducing position on the basis of the deviation signal of the reproduction position information indicating the position to be the playback result of the calculation.

[0011]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing a schematic configuration of an optical disc reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a flowchart showing an operation of the optical disc reproducing apparatus.

In FIG. 1, 1 is an optical disk and 2 is a reproducing means. The reproducing means 2 is an optical pickup 21, a spindle motor 22, a servo control IC (Integrated Circuit).
23 and a signal processing IC 24 that performs demodulation processing and the like.
Reference numeral 3 is a microcomputer that controls the entire optical disk reproducing apparatus, 4 is a DSP (Digital Signal Processor), and 5 is a RAM (Ra that stores reproduction data processed by the DSP.
ndom Access Memory), 6 is D / A (Digital / Analog)
A converter, 7 is an amplifier, 8 is an output terminal, and 9 is an operation unit. The operation unit 9 includes a jog dial 9a and a cue button 9
b, a play button 9c, a pause button 9d, a slide volume 9e, and a display section 9f.

The spindle motor 22 holds the optical disc 1 and rotationally drives the optical disc 1. The optical pickup 21 reads the recording data recorded on the optical disc 1. At this time, the servo control 1C23 controls the spindle motor 22 and the optical pickup 2 so that the optical pickup 21 can normally read the recorded data from the optical disc 1.
Control 1 The output signal of the optical pickup 21 is demodulated into digital audio data (hereinafter simply referred to as data) by the signal processing IC 24 and input to the DSP 4. DSP
4 applies RA to the data and performs RA
Data is written to and read from M5. D /
The A converter 6 converts the data into an analog audio signal and outputs it from the output terminal 8 via the amplifier 7.

The microcomputer 3 includes a reproducing means 2,
It controls the DSP 4, the D / A converter 6 and the amplifier 7. Further, it controls the reproduction process of the optical disc 1 based on the operation input of the operation unit 9. For example, controlling DSP4 to RA
The speed at which audio data is output can be changed by slowing or speeding up the reading of data from M5.

The operation unit 9 includes a jog dial 9a for designating a reading order and a reading speed of the data stored in the RAM 5, operation buttons 9b, 9c, 9d, 9e and a slide volume 9f. The display portion 9f also displays the position where the audio signal is being reproduced.

When, for example, the cue button 9b of the operation unit 9 is operated to instruct the optical disk reproducing apparatus to stand by for reproduction,
The servo control IC 23 controls the optical pickup 21 to read the recording data recorded on the optical disc 1. The recording data read by the optical pickup 21 is stored in the RAM 5 via the signal processing IC 24 and the DSP 4.
At this time, it is possible to increase the rotation speed of the spindle motor 22 to increase the read speed of the recording data recorded on the optical disc 1, and to record the data in the RAM 5 at this high read speed.

The DSP 4 waits for the data to be read from the RAM 5 until the play button 9c is operated. When the play button 9c is operated, the data stored in the RAM 5 is sequentially read, and the read data is output as an audio signal from the output terminal 8 via the D / A converter 6 and the amplifier 7.

When the read data increases by reading the data stored in the RAM 5 sequentially (when there is less new data to be read), the new data to be read is read from the optical disc 1, The read data is stored in the RAM 5 by a method such as overwriting the read data.

Inside the jog dial 9a are attached a rotation detection switch A (not shown) which is switched on and off only while the jog dial is rotated and a rotation direction detection switch B which detects the rotation direction of the jog dial 9a.
The rotation detection switch A is turned on / off at a speed proportional to the rotation speed of the jog dial.

In the figure, is a signal for operating the rotation detection switch A and the rotation direction detection switch B, is a signal indicating a reproduction direction, a reproduction position, a reproduction speed (pitch value) and a reproduction start instruction from a designated position. DSP4 to D /
This is a signal indicating the timing at which one frame of data is sent to the A converter 6.

When scratch reproduction is realized by an analog disc player, when the turntable is pressed with a finger and turned clockwise (clockwise), sound is reproduced in the order recorded on the analog disc (record disc). It At this time, if the turntable is turned fast, the pitch becomes high, and if it is turned slowly, the pitch becomes low. When the turntable is turned in the opposite direction (counterclockwise), the sound is reproduced in the order opposite to the recorded order. Also in this case, as in the case of turning in the positive direction, a high pitch produces a high pitch sound, and a slow revolution produces a low pitch sound. Further, as described above, by repeating the rotation operation in the forward direction and the reverse direction, a rubbed sound is output (scratch reproduction).

In the present embodiment, the scratch reproduction is enabled by performing the same operation as the operation of the turntable on the jog dial 9a.

Here, the relationship between the rotation of the jog dial 9a and the output sound is made to be the same as the relationship between the rotation speed of the turntable and the reproduction output when a record board of 33 rotations is reproduced by an analog player. Set it. That is, set the jog dial to 33+ (1/3) per minute.
Set so that a 1x speed sound is played when rotating.

Therefore, the sound reproduced when the jog dial 9a is rotated once is (1 minute / {33+ (1 /
3)} = 1.8 seconds, and when converted into a subframe in which 1 second is 75 frames, the number of frames output by one rotation of the jog dial 9a is 75 × 1.8 = 135 frames.

Further, the jog dial 9a is configured to switch the rotation detection switch A 135 times during one rotation.

Next, in the present embodiment, when the operation of rotating the jog dial 9a by rotating the jog dial 9a in the forward direction by an arbitrary angle and then rotating it in the reverse direction by the same angle as described above is repeated, the analog Operate the disc player in the same manner as pressing the record disc of the disc player with your finger, rotating it by an arbitrary angle in the forward direction while changing its rotation speed, and then rotating it in the opposite direction by the same angle as above. It will be described that the sound can be repeatedly reproduced without any deviation in the range of the sound recorded in the range.

FIG. 2 is a flowchart showing the operation of the optical disc reproducing apparatus according to this embodiment. First, in the state before the scratch reproduction is started, the reproduction position information S of the reproduction signal reproduced from the RAM 5 is incremented every time one frame of sound is output. Here, the reproduction position information S is information indicating at which position on the optical disc 1 the sound (frame) actually output by the DSP 4 was recorded, and is, for example, "10 minutes 5 seconds 35 frames". As described above, the position information is indicated by time. When the reproduction position information S is updated before scratch reproduction is started, the same information as the updated reproduction position information S is stored in the RAM 5 as the reproduction position information J designated by the jog dial 9a. In the present embodiment, the relationship between the rotation of the jog dial 9a and the output voice is 135 when the rotation of the jog dial 9a1 is 135 as described above.
It supports audio output for frames. Further, since the rotation detection switch A of the jog dial 9a is set to switch 135 times per rotation, the rotation detection switch A
One frame of sound is output every time the frame is switched.

Here, the reproduction position information J is information that changes every time the rotation detection switch A of the jog dial 9a is switched. As described above, the position information that is normally output as voice before the jog dial 9a is operated. S is stored. Before the jog dial 9a is operated, the same pitch value (0%) is stored in the DSP 4 as an ideal pitch value P and a deviation correction pitch value Pg described later. Further, a positional deviation number G described later is initialized to 0.

First, it is assumed that the jog dial 9a is rotated in the forward direction when the reproduction position information S and the reproduction position information J are both "5 minutes 0 seconds 0 frame". When the microcomputer 3 detects a change in the rotation detection switch A of the jog dial 9a, the interval time (on / off time interval) at which the jog dial rotation detection switch changes.
After starting the timer for measuring, the flow shifts to the scratch regeneration start flowchart shown in FIG. In step 1, since the jog dial 9a is rotated as described above, the change of the rotation detection switch A is detected, and the process proceeds to step 2. In step 2, it is determined whether or not there is a change in the rotation direction depending on the state of the rotation direction detection switch B, and if there is no change in the rotation direction, the process proceeds to step 3.
In step 3, the current rotation direction is the positive direction, so the process proceeds to step 5. In step 5, since the reproduction position information J indicates "5 minutes, 0 seconds, 0 frames" as described above, the reproduction position information J is incremented to "5 minutes, 0 seconds, 1 frame" in step 5. When the reverse direction is detected as the current rotation direction in step 3, the process proceeds to step 4 and the reproduction position information J is decremented.

Next, at step 6, the time interval of change of the rotation detection switch A is calculated, and this time interval is stored as the interval time T (second). In step 7, an ideal pitch value corresponding to the rotation of the jog dial is calculated.

Here, a method of calculating an ideal pitch value corresponding to the rotation of the jog dial 9a will be described. First, how many times the speed (double speed value) the jog dial 9a is operated for 1 × speed reproduction is determined. As described above, in the case of 1 × speed, one frame of sound must be output every time the rotation detection switch A is switched,
The interval time of the rotation detection switch A of the jog dial 9a corresponding to 1x speed is (1/75) seconds. The double speed value can be obtained by the ratio of the interval time at the time of single speed and the current interval time. That is,
The double speed value is the interval time at 1x speed (1/75) ÷
It can be determined by the actual interval time.

As described above, the double speed value is 1 at 1 × speed and 2 at 2 × speed. On the other hand, the pitch value is 0% at 1x speed and 100% at 2x speed.
Thus, the pitch value is calculated by subtracting 1 from the above double speed value and multiplying by 100.

Here, it is assumed that the jog dial 9a is rotated at a speed slightly higher than the rotation speed at the 1 × speed. At this time, if the interval time T is 0.0132 seconds, the pitch value P is ((1/75) ÷ 0.0132) −1) × 100 = 2.
It becomes 5 (%), and this value is stored as the ideal pitch value P.

At S8, the reproduction position information J which must be reproduced at present by the instruction of the jog dial 9a,
It is determined whether or not there is a deviation number G from the reproduction position information S of the actually output sound, and if there is no deviation, the ideal pitch value P is stored in the deviation correction pitch value Pg in step 9. If there is a shift, the shift correction pitch value Pg calculated by the shift correction pitch calculation method described below is used. Here, since scratch reproduction has just started, it is assumed that there is no deviation, and the ideal pitch value P (2.5%) is stored in the deviation correction pitch value Pg.

In step 10, a timer count for detecting the interval time until the rotation detection switch A is changed by the next rotation of the jog dial 9a is started.

In step 22, it is judged whether or not a predetermined time (for example, 1 ms) has passed since the last pitch value instruction. If the predetermined time has passed, the process proceeds to step 23,
In step 23, the reproduction speed is shifted and the correction pitch value P is set.
Instruct the DSP 4 to be g. In step 24, the timer for measuring the predetermined time is restarted and the process returns to step 1. Thus, in steps 22 to 24, the deviation correction pitch value is set to the DSP at predetermined intervals.
By sending the data to the player, the deviation of the reproduction position can be quickly repaired. In this example, the pitch value command is 1 m
Although it is set every s, it may be set every time the rotation detection switch is changed by the rotation of the jog dial 9a.

In step 1, the jog dial 9a
If no change in the rotation detection switch is detected, the process proceeds to step 14. In step 14, DSP4 to D
It is determined whether or not the transmission of one frame of data to the / A converter 6 is completed, and if it is completed, the process proceeds to step 15.
In step 15, it is determined whether or not the current rotation direction is the reverse direction. In this example, the rotation direction is the forward direction, so the process proceeds to step 17, and in step 17, the reproduction position information S is incremented. In this example, the current reproduction position information S indicates "5 minutes, 0 seconds, 0 frames", so that it is "5 minutes, 0 seconds, 1 frame" when incremented in step 17. If the rotation direction is opposite, the reproduction position information S is decremented in step 16.

Next, at step 18, the number of positional deviations G
To calculate. In this example, both the reproduction position information J and the reproduction position information S are “5 minutes 0 seconds 1 frame”.
Therefore, the difference becomes 0, and the value of the position deviation number G becomes 0.
Becomes In step 19, it is determined whether or not the rotation direction is the reverse right. In this example, since the direction is the positive direction, the process proceeds to step 21, and in step 21, the positional deviation correction pitch value Pg is calculated by the calculation formula described later. In this example, the number G of positional deviations is 0, so the positional deviation correction pitch value Pg = ideal pitch value P.

As shown in steps 6 and 7, when the jog dial 9a is turned fast, the ideal pitch value P increases to the + side, and when turned slowly, it increases to the-side. Further, the reproduction position information J increased by changing the rotation detection switch A of the jog dial 9a is
The faster the rotation of, the faster it increases, and the slower it slows. At this time, the reproduction position information S indicating the actually output audio position changes the increasing speed in proportion to the ideal pitch value. Further, if the pitch value changes as ideal, the position deviation number in step 18 will be held at a value of zero.

However, depending on the switch density of the jog dial 9a (the number of times the rotation detection switch A is turned on / off per one rotation) or how to determine the predetermined time when the pitch value command is changed, the operation speed of the jog dial 9a is set higher. There is a deviation between the reproduction position information J and the reproduction position information S due to, for example, a delay or a time lag between the detection of the interval time of the rotation detection switch A and the change of the pitch value command. There are cases.

This deviation can be detected in step 18. For example, the jog dial 9a is continuously rotated in the forward direction, and the reproduction position information J is "5 minutes 45 seconds 5 frames".
On the other hand, when the reproduction position information S is “5 minutes 45 seconds 1 frame”, the value of the positional deviation number G is 4 (frames) in step 18. That is,
While the jog dial 9a was operated so as to reach "5 minutes 45 seconds 5 frames", the actual voice means that the reproduction position has reached only "5 minutes 45 seconds 1 frame". Therefore, it is shown that the deviation cannot be corrected unless the pitch is increased. Next step 1
In step 9, the reproduction direction (rotational direction of the jog dial 9a) is judged, and if the reproduction direction is forward, step 21
Proceed to. In step 21, the shift correction pitch value Pg described above is calculated based on the following equation. That is, if the current ideal pitch value P is, for example, 5%, then Pg = P + (0.1 × G) = 5 + (0.1 × 4) = 5.
A value of 4 (%) can be calculated. Here, 0.1 is a coefficient of the pitch to be applied to the deviation value G to correct the deviation, which is 0.1 in this example, but is not particularly specified. In this way, the ideal pitch was 5%, but the corrected pitch value is changed to 5.4%, so the pitch value becomes a little faster,
The correction is continued until the number of shifts becomes 0 most holly. As a result, the correction can be promptly performed.

Next, in step 19, when the current reproduction direction is the reverse direction, the process proceeds to step 20, in which the sign of the positional deviation number G is inverted. Next, in step 21, the deviation correction pitch value Pg is calculated. For example, if the current ideal pitch value P is 5%, the corrected pitch value Pg is: Pg = P + (0.1 * G) = 5- (0.1 * 4) = 4.
It becomes 6 (%). As described above, the ideal pitch value of 5% becomes 4.6% in the corrected pitch value, so the pitch value is slightly delayed, and the correction is continued until the deviation number becomes zero. As a result, the correction can be promptly performed as in the case where the jog dial 9a is operated in the positive direction.

In step 14, the DSP 4
From the D / A converter 6 to determine whether or not the transmission of one frame of data has been completed. If it is determined that the transmission has not been completed, the process proceeds to step 25. In step 25, the change of the rotation detection switch A of the jog dial 9a is 250 ms.
If not detected after the above, step 26
At, the number of positional deviations is set to 0 and the scratch reproduction is ended.

Next, for example, the reproduction position information J is "5 minutes 45".
In the case where the reproduction position information S is "5 minutes 45 seconds 1 frame" in "5 frames per second", and a positional deviation has occurred, the positional deviation correction when the jog dial 9a is operated in the reverse direction will be described. To do. Jog dial 9
Since "a" is operated in the reverse direction, the change in the rotating direction of the jog dial 9a is recognized in step 2, and the process proceeds to step 11. At step 11, the current rotation direction is the reverse direction, so the routine proceeds to step 12.

The change in the rotation detection switch A of the jog dial 9a detected at this time is caused by operating in the reverse direction up to the change point of the switch detected last time when the jog dial 9a was operated in the forward direction last time. It means that you have returned. For this reason, the reproduction position information J remains the last updated information when it is operated in the forward direction.

In step 12, since the reproduction in the reverse direction is started from the position indicated by the reproduction position information J, the DSP 4 is required to start the reverse reproduction from the end of "5 minutes 45 seconds 5 frames" indicated by the reproduction position information J. Instruct. As a result, the above-mentioned deviation is corrected at the moment of reversal. Since this correction is made when the reproduction direction changes from the normal direction to the reverse direction, it is difficult for the user to perceive that the correction has been performed. For this reason, it is possible to correct the deviation without a feeling of strangeness. If the reproduction direction changes from the reverse direction to the positive direction, it will be corrected in step 13.

Since the positional deviation is corrected in this way, the reproducing position information S is initialized to the same value as the reproducing position information J in step 27, and the positional deviation number G is also initialized to 0 in step 28. Also, the jog dial 9
The fact that the direction in which a is proposed is reversed means that the jog dial 9a is temporarily stopped. Therefore, in step 29, the ideal pitch value P and the deviation correction pitch value Pg are set.
Are initialized to −100% respectively. Next, at step 10, the interval time measuring timer count is started.

Even when the jog dial 9a is operated in the reverse direction as described above, when the reproduction position information J and the reproduction position information S are deviated as in the case where the jog dial 9a is operated in the normal direction. The deviation can be corrected by changing the deviation correction pitch value Pg. For example, the reproduction position information J is "5 minutes 45 seconds 5 frames", but the reproduction position information S is "5 minutes 45 seconds 1 frame".
If it is, the positional deviation number G is calculated as 4 (frame) in step 18. This position shift number G
Said that the jog dial 9a was operated such that the playback position reached only up to "5 minutes 45 seconds 5 frames", whereas the actual voice reached "5 minutes 45 seconds 1 frame". In this case, the deviation cannot be corrected unless the pitch is slowed.

As described above, according to this embodiment, even if the special reproduction method performed by the mechanical operation of the turntable of the analog disc player is applied to the optical disc, the output sound is output. Special reproduction such as scratch reproduction can be executed in a state where the range of output sound is constant without accumulating the range shift.

[0050]

As described above, according to the present invention, it is possible to provide an optical disk reproducing apparatus capable of obtaining a reproduction signal that accurately follows a signal instructing reproduction.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an optical disc reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the optical disc reproducing apparatus.

[Explanation of symbols]

1 optical disc 2 Reproduction means 3 microcomputer 4 DSP 5 RAM 6 D / A converter 7 amplifier 8 output terminals 9 Operation part 9a Jog dial 9b Cue button 9c play button 9d po button 9e slide volume 9f display

Claims (4)

[Claims] 1. A reading means for reading the recording data recorded on the optical disc, a storage means for temporarily storing the recording data read by the reading means together with recording position data indicating a recording position of the recording data on the optical disc, and a storing means. Reproduction instruction signal input means for generating and inputting reproduction position information indicating a position to be reproduced based on a signal indicating a read direction, a read speed, and a read start position of the recorded data stored in the recording data, and based on the reproduction position information. A reproduction output means for outputting the recording data stored in the storage means as a reproduction signal, and a control means for controlling the reading means, the storage means and the reproduction instruction signal input means, respectively, the control means comprising the reproduction output means. Based on the update information of the playback signal output by the Calculated, and the optical disk reproducing apparatus, characterized in that to correct the original to the reproduction position deviation signal of the reproduction position information indicating the position to be the playback result of the calculation. 2. The rotation instruction dial according to claim 1, wherein the reproduction instruction signal input means includes a switch that is turned on and off when the reproduction instruction signal input means is rotated, and a switch that outputs a signal indicating a rotation direction thereof. An optical disk reproducing device characterized by the above. 3. The optical disk reproducing device according to claim 1, wherein the control unit adjusts a read speed from the storage unit based on the deviation signal. . 4. A reading means for reading the recording data recorded on the optical disc, a storage means for temporarily storing the recording data read by the reading means together with recording position data indicating a recording position of the recording data on the optical disc, and a storing means. Reproduction instruction signal input means for inputting reproduction position information indicating a position to be reproduced based on a signal indicating the reading direction, the reading speed and the reading start position of the recorded data stored in, and the reading means, the storage means and the reproduction instruction. A control means for controlling each of the signal input means is provided, and the control means stores the recording data stored in the storage means,
When the reproduction instruction signal input means instructs to invert the reproduction direction of the record data while reading out following the reproduction position signal calculated on the basis of the reproduction instruction signal, the recording data being read is used as a starting point in the inversion direction. An optical disc reproducing apparatus, characterized in that the reproduction of the optical disc is started.