JPS59107455A - Temporary stop device of disk reproducer - Google Patents

Abstract

PURPOSE:To continue reproduction information after a temporary stop by comparing a frame reproduced from a disk with a frame set optionally through a pickup means and executing a track jump in accordance with the result of comparison. CONSTITUTION:The position index signal is detected by a detecting circuit 5 among those signals read out by a pickup means 1 and then supplied to a comparator 6 in the form of the position index signals of minute, second and frame respectively. These position index signals are also supplied to a latch circuit 7. At the same time, an action signal is supplied a specific frame setting circuit 11 with operation of a temporary stop switch 9. Then a specific frame is applied to the comparator 6 as the comparison data. The comparator 6 compares the comparison data with the position index signal and produces an output signal CO in case the position index signal is larger than the comparison data. Thus a track jump pulse generating circuit 12 is driven, and a track jump pulse is generated so as to change the read-out point of the means 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pause device in a playback device for a disk in which information (for example, music) and a position index signal indicating the position of this information are recorded, and the present invention relates to a pause device in a playback device for a disk in which information (for example, music) and a position index signal indicating the position of this information are recorded. The system is configured so that when playback is restarted after being stopped, the playback information is continuous, and track jumps are performed to change the readout point of the pickup means, paying particular attention to the frame of the position index signal. This invention provides a pause device in a disc playback device.

Recently, devices have been proposed for optically or electrostatically recording and reproducing audio and video signals on a disk in a spiral manner. Since such a disc does not have grooves like a conventional audio record disc, a tracking control signal is created based on the signal derived from the pickup means, and this tracking control signal is used to determine the readout point of the recipe pickup means. It is necessary to perform tracking control so that the track can be scanned correctly. That is, the pickup means has a tracking function.

Now, while a disc is being played back using the above-mentioned disc playback device, there may be cases where it is desired to temporarily stop the feed 9 of the pickup means.

Considering tracking control in such a paused state, it is difficult to expect good playback in a paused state [particularly in the case of audio discs, information over a certain period of time (for example, several seconds) cannot be expected. [Repeated playback alone is not very meaningful], and it is also conceivable not to perform tracking control. However, if this is done, the tracking control system will be greatly disturbed during the temporary stop, and it will take time for the control system to stabilize thereafter, which is undesirable. Therefore, it is necessary to operate the tracking control system even in a paused state. Therefore, even in a paused state where the pickup means stops feeding, the tracking function of the pickup means itself allows tracking control to be performed within a period (for example, several seconds) within its capability range. The information for this period will be played repeatedly.

Now, what must be taken into consideration when canceling the paused state and starting playback again is to ensure that the readout points of the pickup means are continuous so that playback resumes from the paused position. It is necessary to make the reproduction information continuous in this way. However, even in the paused state, the tracking function is activated and the readout point of the pickup means follows the spiral track within its tracking capability range. That is, the readout point of the pickup means is moving within the tracking capability range. Moreover, the greater the dragging ability, the greater the movement range of the readout point. Therefore, whether or not the readout point at the time of pause and the readout point at the time of restarting playback depends on the timing of restarting playback.
It is highly probable that the two match.

By the way, in compact disc digital audio systems that have been proposed recently, in addition to information such as music, position indicator signals (for example, performance time and frames of each song) regarding the position of the information are recorded on the disc. ing.

First, to explain the position index signal, for example, in the currently proposed compact disc digital audio system, control signals are recorded at regular intervals in the gaps between music information (original digital data). There is. This control signal is composed of 8 bits, and one bit is used to record the playing time of a song (the playing time of one song or the continuous playing time from the first song). Furthermore, since the compact disc digital audio system performs digital processing on the reproduction of data based on a clock, synchronization is required. Therefore, the data flow is divided into frames. In other words, one frame is a block of 588 bits with the longest synchronization signal, and 98 of these one frame (I) are aggregated to form one
This data constitutes a higher-order frame (11).

This newly constructed frame is “00//~”74”
The frame is repeated up to 75 and becomes 00, making up one second. That is, 75 frames correspond to one second. FIG. 2 shows a model of the position index signal used in the present invention.

Therefore, the present invention focuses on this frame and performs the pause function more accurately.

To explain the present invention more specifically, the compact disc digital audio system is defined as having a constant linear velocity of 1.2 om/sec to 1,40 m/sec.
The signal surface of the disc is specified to have an innermost diameter of 5Q mm and an outermost diameter of 116mm. Therefore, the innermost circumference of the disk needs to rotate at 7.64 to 8.91 rotations/second, and the outermost circumference needs to rotate at a rate of 6.29 to 3.84 rotations/second per unit time.

To summarize the above, the disk rotates approximately 6 to 9 times per second.
Rotate. Conversely, the minimum and maximum time required for one rotation is 1/9 [second] to 1/6 [second], which corresponds to 9 to 25 frames when converted into frames.

Therefore, in the present invention, the pause function is performed more accurately by focusing on this frame.1.Hereinafter, the present invention will be explained in detail. FIG. 1 is a block diagram of an apparatus showing an embodiment of the present invention, in which a signal recorded on a disk (not shown) is picked up by a pickup means
A tracking control signal is created by applying the output signal of the pickup means (1) to the tracking processing circuit (2). This tracking control [- is applied to the drive circuit (3), and the output of the drive circuit (3) is used for example as an optical pickup means (1).
) is actuated to control the position of a mirror or lens (both not shown), thereby achieving tracking control of the readout beam.

The configuration of such a tracking control system is disclosed in, for example, Japanese Unexamined Patent Application Publication No. 1986-
This is already a known technique as disclosed in No. 94007.

On the other hand, the signal read out by the pink-up means (1) is
The signal is applied to a digital processing circuit (4), where digital processing is performed based on the clock, and music information data, synchronization signals, position index signals, etc. are demodulated. Among these demodulated signals,
A position index signal is detected by a position index detection circuit (5). The position index signal of ``minutes seconds frames'' detected by the position index signal detection circuit (5) is sent to the comparison circuit (6).
and the latch channel (7).

The latch circuit (7) displays the playing time in minutes and seconds.
8) and the latch signal is supplied from the central processing unit (CPU) α0) by operating the pause switch (9). Further, by operating the temporary stop switch (9), a specific frame setting circuit 01)K operation signal is supplied, and comparison data is given to the comparison circuit (6). This comparison circuit (6) compares the position index signal read out by the pickup means (1) with comparison data, and when the position index signal is greater than or equal to the comparison data, an output signal "co" is output.
The track jump pulse generating circuit (121) is activated, and a track jump pulse is generated to change the readout point of the pickup means (1), so that the readout point of the pickup means (1) returns to the previous position. Note that the specific frame setting circuit αD sets the specific frames fA”af from “oo” to “74”.

Specifically, to describe the operation, if we assume that the pause start point is Rollo minutes △△ seconds × × frames, the operation of the pause switch (9) causes the central processing bag fj7d<CPU)10
) supplies a latch signal to the latch circuit (7), and the position index signal RORO minutes ΔΔ seconds continuously outputted by the pickup means (1) is supplied to the display (8) to hold and display the playing time. Accordingly, the data of minutes and seconds at the start of the pause is supplied to the matching circuit (6).In addition, the specific frame setting circuit 01J and the specific frame ◇◇ are supplied to the comparison circuit (6). supplied to

Here, since the value and operation of the XX frame at the start of the pause and the specific frame ◇◇ are different, they will be explained separately.

(1> When the XX7 frame is smaller than the ◇◇ frame: In this case, the pickup means (1) can follow up to the ◇◇ frame, and when the ◇◇ frame is reached, the comparison circuit (
6) The output signal "CO" is supplied to the track jump pulse generation circuit α2), and a trunk jump pulse is generated. At this time, if the readout point of the pickup means (1) exceeds the Roro minute △△ seconds, the 7 seconds will change, but since the minutes and seconds at the start of the pause are latched, the display ( 8) The display change does not occur.At this time, the degree of track jump is from a minimum of 9 frames to a maximum of 2 frames.
Since there are 5 frames, the time difference between the pause release point and the pause start point is within the range of ◇◇−XX frames from 125 frames (minus indicates that time moves backward). Since this is within 1 1/6 seconds to at least 1 second, the playback information can be continuously heard when the pause is released, so there is no problem with the auditory sense.

(1) When the XX7 frame is larger than the ◇◇ frame: At this time, the comparison circuit (6) generates the output signal "CO", so the pink-up means (1) immediately performs a track jump. At that time, the time difference between the pause release point and the pause start point is ◇◇−××125 to ◇◇−×
× frame range. Then, the device index signal consisting of the track-jumped pickup means (1) is △△-1 seconds? ? When it comes to frames, the performance time at the start of the pause is compared, so since it is smaller than the "second" data of the comparison data, the pick-up means (1) is scanned to follow until the start of the pause △△ seconds x frame. , the track is jumped.

Next, a second embodiment of the present invention will be explained. Third
In the figure, α3) is a latch circuit that stores the position index signal "minutes", "seconds", and "frames" at the start of the pause, and when the pause switch (9) is operated, the central processing unit
(3PU)' A latch signal is generated from (10) and is configured to latch the start of a pause. According to such a configuration, if the pause start point is now 4 minutes △△ seconds x X frames, by operating the pause switch (9), the position index signal at that point, 1 day minutes △△ seconds x × frame is outputted as comparison data of the comparison circuit (6). Therefore, at this time, after operating the pause switch (9), the pause start point is latched in the latch circuit (13), the comparison data is given to the comparison circuit (6), and then read out by the pickup means (1). Since the position index signal is larger than the comparison data, a track jump will be performed immediately.

And truck jump Nyo 9 pickup means (1
) is 91 seconds before the pause start point △△ seconds, is it △△-1 second? ? Frame At this time, the performance time display (8) does not change because the performance time RORO minutes ΔΔ seconds at the time of the start of the pause is held. And Roro minute△△-1 second? ? The pick-up means (1), which is restarted every frame, is scanned until it reaches the pause start point RORO minutes △△ seconds "CO" is generated, drives the track jump pulse generation circuit (12), and selects a predetermined frame (9 to 25) depending on the position of the pickup means (1) on the disk at that time.
frame) track jump is performed.

Therefore, ideally, if the track jump is performed at the same time as the pause starts, and the pause start point is written in the comparator circuit as comparison data, the position of the pickup means (1) on the disk at the pause point can be 9-25 frames, make it time/25 [seconds]
~1/ro [seconds] Pause 4 Return from the start point. This allows information to be continuously reproduced multiple times by the pickup means (1) without causing any audible problems.

As described above, the present invention provides a pause setting means for temporarily stopping the feeding of the pickup means, and a position index signal relating to the position of information to be reproduced on the disc when the pause setting means starts the pause. A circuit for storing "minutes", "seconds" or "frames", and a comparison circuit for comparing the size of the frame played back from the disc by the pickup means and the arbitrarily set frame or the frame at the start of the pause. , the trunk jump pulse setting means is configured to cause the pickup means to perform a track jump so as to change the readout point of the pickup means according to the output of the comparison circuit, so that when the pause is released, the playback is stopped. The information is played back continuously and can be listened to continuously without any auditory problems. There is also a memory circuit that latches the minutes and seconds, so if you hold it during the pause period, the performance time will be displayed between the original pause start point and the pause period. Since the display can be performed so that there is no time difference from the point in time when the pause is canceled, there is no problem with the audibility described above, and the pause device of the disk playback device has various important effects and meanings.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a pause device of a disc playback device according to the present invention, FIG. 2 is a model diagram of a position index signal used in the present invention, and FIG. 6 is a second embodiment according to the present invention. 1 is a block diagram illustrating a pause device of an example disc playback device; (1)...Pick 271 means, (5)...
・・Position index signal detection circuit, (6) ・・・Several circuit, (7) ・・・Launch circuit, (8) ・・・
・Indicator, (9)...Pause switch, (1
1)...Specific frame setting circuit, 02)...
...Track jump pulse generation circuit, (13)
...Latch circuit.

Claims (2)

[Claims] (1) In a disc playback device that plays back information recorded on a disc using a pickup means having a tracking function, a pause setting means for temporarily stopping the feeding of the pickup means; When a pause is started by the pause setting means, a memory circuit for storing minutes, seconds, or frames regarding the position of information reproduced from the disc by the pickup means; a comparison circuit for comparing a frame with an arbitrarily set frame; and a comparison circuit for causing the pickup means to perform a track jump in order to change one readout point of the pickup means in response to the output of the comparison circuit. 1. A pause device for a disc playback device, characterized in that a track jump setting means is provided. (2) When the pause setting means pauses, a circuit for storing "minutes seconds frames" which is the position index signal at the start of the pause, and the output of this storage circuit as matching data; a comparison circuit for comparing with the position index signal reproduced by the pink-up means; and for causing the pickup means to perform a track jump in order to change the readout point of the pickup means in response to the output of the comparison circuit. 2. A pause device for a disc playback device according to claim 1, further comprising track jump setting means.