JPH0620410A - Disk reprodcuing device - Google Patents

Abstract

PURPOSE:To prevent flickering of display by providing a display device control means which holds the display state of a position index for the start of temporary stop during the temporary stop. CONSTITUTION:Time signal read out by a pickup 1 is inputted to a digital processing circuit 4 and is subjected to digital processing to demodulate music information data, a synchronizing signal, a position index signal, etc. The position index signal is detected by a detecting circuit 5 and is supplied to a comparator circuit and a latch circuit 7. The circuit 7 gives a play time to a display device 8, and the play time momently changed at the time of reproducing is displayed. A latch signal is supplied to the circuit 7 from a CPU 10 by the operation of a temporary stop switch 9, and the position index signal is latched before release of temporary stop.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc reproducing apparatus for a disc on which information (for example, music) and a position index signal for indexing the position of this information are recorded.

[0002]

2. Description of the Related Art In a conventional disc reproducing apparatus, during a pause, position index signals such as minutes and seconds which are reproduced from the disc when a pause switch is operated, and then,
Compare with the position index signal reproduced from the disc,
When the position index signals coincide with each other, the reproduction position on the disc is changed toward the start side by at least one track. This is, for example, in Japanese Patent Application No. 57-15
No. 0967.

[0003]

By the way, in general,
During the reproduction, the minute and second position index signals are displayed on the display device to inform the user of the reproduction position.
When the playback position is changed during pause as described above, the display screen is changed at short intervals during the pause period when the content of the position index signal changes, so it is very difficult to see, and pause start This is not preferable because it informs the user that the time is different from the time when the suspension is released.

[0004]

A disc reproducing apparatus of the present invention reproduces information recorded on a disc by using a pickup means having a tracking function, and
At the time of reproduction, when the pause is started by the pause setting means, the position index signal reproduced from the disc is compared with the position index signal reproduced from the disc thereafter, and both position index signals are detected. Display means for displaying a position index based on the position index signal, in which the pickup means is caused to perform a track jump in order to change the read-out point of the pickup means when a predetermined relationship is established, During the temporary stop, display control means for controlling the display means is provided so as to maintain the display state of the position index when the temporary stop is started.

[0005]

The present invention is configured as described above,
During playback, the position index that is displayed changes momentarily, and during pause, the display state of the position index when the pause is started is retained.

[0006]

First, the position index signal will be described. For example, in the currently proposed compact disc digital audio system, a control signal is provided at intervals of music information (original digital data). Is recorded. This control signal is composed of 8 bits, and one bit is used to record the performance time of the music (the performance time of one music or the performance time continuous from the first music). In addition, since the compact disc digital audio system digitally processes the reproduction of the data based on the clock, synchronization is required. Therefore, the data flow is divided frame by frame. That is, one frame is a 588-bit lump having the longest synchronization signal, and one frame (I) is 9
Eight pieces are aggregated to form one piece of data, which constitutes a higher-order frame (II). This newly constructed frame is repeated from "00" to "74" and is "00" at "75".
And constitutes 1 second. That is, 75 frames correspond to 1 second. FIG. 2 shows a model of the position index signal used in the present invention.

Therefore, in the present invention, attention is paid to this frame to perform the pause function more accurately.

The present invention will be described in more detail. The compact disc digital audio system is specified to have a constant linear velocity, and the linear velocity is 1.20 m / sec.
It is standardized in the range of 1.40 m / sec, and the signal surface of the disk is standardized to have an innermost peripheral diameter of 50 mm and an outermost peripheral diameter of 116 mm. Therefore, at the innermost circumference of the disc, 7.
64-8.91 revolutions / second, 3.29-3.8 at the outermost circumference
It is necessary to rotate 4 rotations / second.

Summarizing the above, a disk has about 3 per second.
9 rotations from rotation. On the contrary, the minimum time and the maximum time required for one rotation are 1/9 [sec] to 1/3 [sec], which is equivalent to 9 to 25 frames when converted into frames.

Therefore, in the present invention, attention is paid to this frame to perform the pause function more accurately. Less than,
The present invention will be described in detail. FIG. 1 is a block diagram of an apparatus showing an embodiment of the present invention. In the drawing, a signal recorded on a disc (not shown) is read by a pickup means (1). The tracking control signal is created by applying the output signal of 1) to the tracking processing circuit (2). This tracking control signal is applied to the drive circuit (3), and the output of the drive circuit (3) controls the position of, for example, a mirror or a lens (both not shown) forming the optical pickup means (1). A coil (not shown) is activated, thus achieving tracking control of the read beam. The structure of such a tracking control system is a known technique as disclosed in, for example, JP-A-54-94007.

On the other hand, the signal read by the pickup means (1) is applied to a digital processing circuit (4) and digitally processed based on a clock to obtain music information data,
The synchronization signal, the position index signal, etc. are demodulated. Among these demodulated signals, the position index signal is detected by the position index detection circuit (5). The position index signals of "minute", "second" and "frame" detected by the position index detection circuit (5) are supplied to the comparison circuit (6) and the latch circuit (7). The latch circuit (7) gives performance times of "minutes" and "seconds" to the display unit (8), and displays the performance time that changes every moment during reproduction. The latch circuit (7) is supplied with a latch signal from the central processing unit (CPU) (10) by operating the temporary stop switch (9), and latches the position index signal until the temporary stop is released. Further, by operating the pause switch (9), an operation signal is supplied to the specific frame setting circuit (11) and comparison data is given to the comparison circuit (6). The comparison circuit (6) compares the position index signal read by the pickup means (1) with the comparison data. When the position index signal is equal to or higher than the comparison data, an output signal "CO" is generated to track the track. The track jump pulse is generated so as to drive the jump pulse generating circuit (12) and change the reading point of the pickup means (1), and the reading point of the pickup means (1) returns to the front. The specific frame setting circuit (11) is "00".
To specific frames up to "74".

Specifically, the operation will be described. Now, assuming that the pause start time is □□ minutesΔΔseconds ×× frames,
The central processing unit (CP
A latch signal is supplied from U) (10) to the latch circuit (7) and a position index signal □□ minute ΔΔ second read by the pickup means (1) is supplied to the display (8) to hold and display the playing time. To do. Along with this, data □□ minutes ΔΔseconds of “minutes” and “seconds” at the start of the temporary stop are supplied to the coincidence circuit (6). Further, the specific frame setting circuit (11) supplies the specific frame ◇◇ to the comparison circuit (6).

Since the operation differs depending on the values of the xx frame and the specific frame ⋄⋄ at the start of the pause, they will be described separately.

(I) XX When the frame is smaller than the ◇◇ frame: At this time, the pickup means (1) can follow up to the ◇◇ frame, and when the ◇◇ frame is reached, the output signal from the comparison circuit (6) is output. "CO" is supplied to the track jump pulse generation circuit (12) to generate a track jump pulse. Then, at this time, when the read-out point of the pickup means (1) exceeds □□ minutes △△ seconds, the "second" changes, or the "minute" and "second" at the start of the pause.
Is latched, the display of the display (8) does not change. At this time, the degree of track jump is at least 9 frames and at most 25 frames, so the time difference between the point at which the pause is canceled and the point at which the pause is started is from -25 frames to ◇◇-×× frame advance range (minus is minus It shows that time goes backwards). This is -1/3 in time
Since it is at least 1 second from [seconds], the playback information can be continuously heard when the pause is released, so that there is no problem in hearing.

(II) When XX frame is larger than ◇◇ frame: At this time, the output signal "CO" is generated in the comparison circuit (6), so that the pickup means (1) immediately performs the track jump. At that time, the time difference between when the suspension is released and when the suspension is started is ◇◇ − ×× +
The range is from 25 to ◇◇ −− ×× frames. Then, the position index signal reproduced from the pick-up means (1) which has been track-jumped is □□ minutes △△ -1 second? ? When it comes to a frame, the playing time at the start of the pause is compared, so it is smaller than the "second" data of the comparison data. Therefore, the pickup means (1) is scanned following the pause start time □□ minutes ΔΔ seconds xx frames. After that, the track rack is jumped.

Next, a second embodiment according to the present invention will be described. In FIG. 3, (13) is a latch circuit for storing the position index signals "minutes", "seconds", and "frames" at the start of the temporary stop, and the central processing unit ( A latch signal is generated from the CPU (10) to latch the start time of the temporary stop. According to such a configuration, if the pause start time is now □□ minutes △△ seconds ×× frames, the position switch signal (□□ minutes △△ seconds ×) which is the position index signal at that time point is operated by operating the pause switch (9). The × frame is output as the comparison data of the comparison circuit (6). Therefore, at this time, after the temporary stop switch (9) is operated, the temporary start point of the temporary stop is latched in the latch circuit (13), the comparison data is given to the comparison circuit (6), and then read by the pickup means (1). Since the position index signal is larger than the comparison data, the track jump is immediately performed.

Then, when the reading point of the pickup means (1) is one second before the ΔΔ second at the start of the pause due to the track jump, that is, □□ minute ΔΔ-1 second? ? During the frame, the display of the playing time does not change because the playing time □□ minutes △△ seconds at the start of the pause is held on the display (8). And □□ minutes △△ -1 second? ? The pick-up means (1) restarted from the frame is subjected to follow-up scanning up to the pause start time □□ minutes △△ seconds XX frames, and then the comparison circuit (6) detects the pause start time.
The output signal "CO" is generated by the drive circuit, drives the track jump pulse generation circuit (12), and a track jump of a predetermined frame (9 to 25 frames) is performed according to the position of the pickup means (1) on the disk at that time. .

Therefore, ideally, when the track jump is performed at the same time as the start of the temporary stop and the temporary start point of the temporary stop is written in the comparison circuit as the comparison data, the position of the pickup means (1) on the disk at the temporary stop point. 9 to 25 frames, depending on the time 3
/ 25 [sec] to ⅓ [sec] Return from the start of the temporary stop. This is a pickup means (1) without any problem in hearing.
Information can be reproduced more continuously.

[0019]

The present invention is configured as described above, and the display state of the position index is maintained during the temporary stop period, the display does not flicker, and the temporary stop start point and the temporary stop. It can be displayed so that there is no time difference from the release time.

[Brief description of drawings]

FIG. 1 is a block diagram showing a pause device of a disc reproducing apparatus according to the present invention.

FIG. 2 is a model diagram of a position index signal used in the present invention.

FIG. 3 is a block diagram showing a pause device of a disc reproducing device showing a second embodiment according to the present invention.

[Explanation of symbols]

 1 Pickup Means 5 Position Index Signal Detection Circuit 6 Matching Circuit 7 Latch Circuit 8 Display 9 Temporary Stop Switch 12 Track Jump Pulse Generation Circuit 13 Latch Circuit

Claims (1)

[Claims] 1. The information recorded on the disc is reproduced by using a pickup means having a tracking function, and is reproduced from the disc when the pause is started by the pause setting means during the reproduction. The position index signal is compared with the position index signal reproduced from the disc thereafter, and when both position index signals have a predetermined relationship, the pickup means is changed to change the read point of the pickup means. And a display means for displaying the position index based on the position index signal, and the display for maintaining the display state of the position index when the pause is started during the pause. A disc reproducing apparatus comprising display control means for controlling the means.