JP2600773B2 - Disk playback device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc reproducing apparatus, for example, an audiovisual information recording area in which an audio signal is recorded as audiovisual information and an audiovisual information recording area in which a video signal is recorded as audiovisual information. The present invention is suitably applied to a disc reproducing apparatus for reproducing an optical disc having the same.

B. Summary of the Invention The present invention reproduces a disk-shaped recording medium having an audiovisual information recording area in which audio information is recorded together with first address information and an audiovisual information recording area in which audiovisual information is recorded together with second address information. In the disc reproducing apparatus, the audio information recording area (or the audiovisual information recording area) is read from the pickup for reproducing the first address information (or the second address information).
Address information), the position of the pickup can be detected based on the reproduced information, thereby detecting the switching portion between the auditory information recording area and the audiovisual information recording area without using a mechanical position sensor or the like. Then, the pickup can be moved to the audiovisual information recording area (or the audiovisual information recording area).

C Conventional Technique Conventionally, an audio information recording area (hereinafter, referred to as an audio part) in which an audio signal is recorded and an audiovisual information recording area (hereinafter, referred to as a video part) in which a video signal is recorded are recorded. As a disk-shaped recording medium, for example, an optical disk of a CDV (compact disk vision) system (hereinafter referred to as a CDV disk) has been proposed.

In this type of CDV disc, generally, an audio part in which an audio signal is recorded is formed in an area from the center of the disc to a position having a radius of 37.5 mm, and a video part in which a video signal is recorded in an outer peripheral area thereof. Are formed.

At this time, both the audio signal and the video signal are recorded by a recording method with a constant linear velocity (CLV), but the audio part is 1.2 to 1.4 [m / s] is selected and the corresponding disk speed changes from the inner circumference to the outer circumference from 500 to 200 (rpm), while the linear speed of the video part is about 10 times that of the audio part. Of 11-12
[M / s], and the rotation speed of the disk corresponding thereto changes from 2700 to 1800 [rpm] from the inner circumference to the outer circumference.

For this reason, in a disc reproducing apparatus for reproducing a CDV disc, for example, an optical position sensor is mounted on a chassis at a predetermined position corresponding to a switching portion between an audio part and a video part of the disc, and an optical head is provided from the inner peripheral side of the disc. During playback of the audio part, when the optical head detects that the optical head has arrived at that position, the number of rotations of the disk is forcibly changed to perform a switching operation between the audio part and the video part. The one used to reproduce the part is used.

D. Problems to be Solved by the Invention However, in a disk reproducing apparatus having such a configuration,
When mounting the position sensor, high positional accuracy is required, and it is necessary to take into account the manufacturing positional deviation such as eccentricity of the disk which is allowed in the format of CDV disk. There was a problem that occurred.

Further, in this disc reproducing apparatus, if the position sensor breaks down or malfunctions, it is impossible to avoid the possibility that the switching operation between the audio part and the video part becomes practically impossible.

The present invention has been made in consideration of the above points, and detects a switching portion between an audio part and a video part on a CDV disc without using a position sensor to perform a switching operation between the audio part and the video part. It is intended to propose a disc reproducing apparatus to be obtained.

Means for Solving E Problem In order to solve such a problem, in the present invention, the first
Disc-shaped recording in which an audio information recording area in which the address information QD and the audio information are recorded and an audio-visual information recording area in which the second address information QD and the visual information are recorded with a predetermined non-signal portion interposed therebetween In the disc reproducing apparatus 1 for reproducing the medium 2, based on the first address information QD or the second address information QD obtained from the pick-up 3 being reproduced, the disc reproducing apparatus 1 is located near the boundary between the audio information recording area and the audio information recording area. When it is determined that the pickup 3 has approached, the pickup 3 is supplied with signals S _PH and C _PH crossing a predetermined number of tracks such that the pickup 3 jumps over a no-signal portion, so that the pickup 3 is stored in an audiovisual information recording area or an audio information recording area. I moved it.

F function By reproducing the first or second address information QD from the pickup 3 which is reproducing the auditory information recording area or the audiovisual information recording area, the position of the pickup 3 can be detected based on the reproduction information. By detecting the boundary between the audio information recording area and the audio information recording area without using a mechanical position sensor or the like, the pickup 3 can be moved to the audio information recording area or the audio information recording area.

 G Example Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a disc reproducing apparatus as a whole according to the present invention, in which recorded information of an audio part or a video part on a CDV disc 2 rotating at a predetermined rotational speed about an axis O is a laser beam of an optical head 3. is by connexion read in light L _1, is given to the demodulation circuit 4 and the traverse count circuit 5 as the reproduction RF signal S _RF.

The demodulated output S _OUT obtained from the demodulation circuit 4 is transmitted to a predetermined audio / video processing circuit (not shown) following the subsequent stage, and is also transmitted to a Q data extraction circuit 6, where the demodulated output S _{OUT is} output. The included Q data QD is extracted and sent to the control circuit 7 as a Q data signal S _QD . The demodulation circuit 4 with which extracts the clock component included in the reproduced RF signal S _RF, a frequency signal S _FG, and sends it to the spindle motor driving circuit 8.

On the other hand, the traverse counting circuit 5 supplies a reproduction error signal S _RF and a tracking error signal obtained from the optical head 3 to the traverse counting circuit 5.
S _TE is input, thereby delivering to the control circuit 7 to the traverse count signal S _TC generated in response to the recording track number on the optical head 3 is side cutting ivy CDV disc 2.

The control circuit 7 controls the spindle motor drive circuit 8
Based on the input Q data signal S _QD and traverse count signal S _TC , a spindle motor control signal S _SM corresponding to various processes is sent out, and the spindle motor drive signal is sent to the spindle motor 10 via the spindle motor drive circuit 8.
The _CSM is supplied to control the rotation speed of the CDV disk 2. The control circuit 7 includes an optical head driving circuit 9.
An optical head control signal S _PH generated in the same manner as the spindle motor control signal S _SM is transmitted to the optical head 3 via the optical head drive circuit 9 to supply the optical head drive signal C _PH to the optical head 3. The optical head 3 is positioned and controlled on a predetermined recording track on the optical disk 2.

Here, in the case of this embodiment, the control circuit 7 executes the audio part / video part switching processing program SP shown in FIG.
By executing 1, the switching process from the audio part to the video part on the CDV disk 2 is executed, for example.

That is, the control circuit 7 determines that the optical head 3 is a CDV disc 2
While playing the audio part above,
Whether or not the optical head 3 is scanning near the end of the audio part on the CDV disc 2 based on the Q data signal S _QD obtained from the Q data extraction circuit 6 in step SP2, entered from the video part switching processing program SP1. Judge.

Actually, the Q data signal S _QD obtained from the Q data extracting circuit 6 includes the Q data Q D as shown in FIG. 3 for each frame of the recorded audio data or video data.

That is, one frame unit of this Q data QD is a 4-bit control signal CONT representing emphasis information and the like. Similarly, a 4-bit control signal CONT indicates the audio part when the 4-bit configuration is a value "0001", and a value "0100" In this case, an address signal ADR indicating a video part, track information TRK consisting of 8 bits, a track number TRX, index information IDX consisting of 8 bits, minute data MIN each representing 8 minutes as time information in a song and representing minute information, and seconds. Seconds data SEC indicating information and frame information for every 1/75 second
8-bit all "0" information ZERO, minute data PMIN representing minute information consisting of 8 bits each as accumulated time information from the beginning of the audio part or video part, minute data PSEC representing second information, and 1/75 second The frame information is composed of a frame number PFRM.

In the control circuit 7 step SP2, the cumulative time information of the Q data QD contained in the above-mentioned Q data signals S _QD (i.e. partial data PMIN, seconds data PSEC and the frame number PFRM)
When the cumulative time from the beginning of the audio part reaches 20 minutes, for example, the optical head 3
It is determined that scanning is being performed near the end of the upper audio part, and the process proceeds to the next step SP3.

On the other hand, if the total time from the beginning of the audio part is less than 20 minutes, it is determined that the optical head 3 has not come near the end of the audio part on the CDV disc 2, and step SP2 is repeatedly executed again. . In this way, the control circuit 7 waits for the optical head 3 to come near the end of the audio part on the CDV disc 2 and then informs that the optical head 3 comes near the end of the audio part on the CDV disc 2 soon. When the detection is performed in the same manner as described above, the process proceeds to the next step SP3.

In step SP3, the control circuit 7 determines that the optical head 3 is a CDV.
The number of tracks (in this case, for example, 2,000 tracks) required to jump over the switching portion between the audio part and the video part on the disk 2 is set in the internal track counter, and the process proceeds to the subsequent step SP4.

Actually, a permissible area consisting of a non-signal portion with a width of 0.3 [mm] is set between the audio part and the video part on the CDV disc 2, and the number of tracks required to jump over this non-signal portion is It is made to set 2000 tracks.

Control circuit 7 in step SP4, and sends the optical head control signal S _PH to start jump track the optical head driving circuit 9, the traverse is obtained from the traverse count circuit 5 in the next step SP5 count signal S _TC
, The internal track counter is counted down, and the count value and Q of the track counter are counted down.
The presence / absence of a count error is determined using the track information TRK of the Q data QD included in the Q data signal S _QD obtained from the data extracting circuit 6, and there is a count error due to, for example, a scratch or the like on the CDV disk 2. Re if the control circuit 7 moves connexion to step SP6, then the light head 3 to deliver light head control signal S _PH to return to the innermost circumference of CDV disc 2 in the optical head driving circuit 9, and the above processing returns to step SP2 Repeat again.

If there is no count error, the control circuit 7 proceeds to the next step SP7, determines whether or not the count is completed based on whether or not the count value of the track counter is "0", and returns a negative result. If it obtains, it returns to the above-mentioned step SP5 to continue the skipping process of the track, and if it obtains a positive result, it moves to the next step SP8.

In step SP8, the control circuit 7 changes the number of revolutions to the spindle motor drive circuit 8 to a prescribed number of revolutions (in this case, for example, 2700 [rpm]), and keeps the angular velocity constant (CAV).
(Constant angular verosity)) sends out a spindle motor control signal S _SM to rotate in a manner, that CAV
To deliver light head control signal S _PH to drive the optical head 3 to reproduce the data recorded on the CDV disc 2 in a manner to the optical head driving circuit 9, and proceeds to the following step SP9.

At step SP9, the control circuit 7 maintains the reproduction state of the CAV system, based on the Q data QD included in the Q data signal S _QD obtained from the Q data extraction circuit 6,
For example, detecting the head position of the video part from the sub-code, etc. on the CDV disc 2, after sending the optical head control signal S _PH for moving the optical head 3 to the head position of the video part to the optical head driving circuit 9, CLV the spindle motor control signal S _SM to rotate the CDV disc 2 in a manner well as transmitted to the spindle motor driving circuit 8, the
To deliver light head control signal S _PH to drive the optical head 3 to reproduce the data recorded on the CDV disc 2 by the CLV method in the optical head driving circuit 9, CDV disc 2 in this manner
After the switching process from the audio part to the video part is executed, in the next step SP10, the audio part / video part switching processing program SP1 is terminated.

Disc reproducing apparatus 1 in the configuration described above, as shown in Figure 4, between the reproducing position P ₁ to the end of the audio part from the position P ₀ of the innermost circumference of the CDV disc 2, corresponding to the audio part For example, the rotation speed is 500 [rpm]
Is the rotation control in the first CLV method CLV1 that changes 200 (rpm) from and by the control circuit 7 at a position P ₁ near the end of the audio part is to perform the audio part / video part switching control program SP1, positions CA between reproducing the lead-in area of the video part indicated by P ₁ to P ₂
Rotated controlled by V method CAV1, further control circuit 7 detects the head position P ₂ of the playback to the video part of the lead-in area of the video part, after moving the optical head 3 to the position P _2, position value P between ₂ up to the position P ₃ of the outermost periphery of the CDV disc 2, the rotation speed for example in accordance with the video part 2700
Second CLV system CLV2 that changes from [rpm] to 1800 [rpm]
Thus, the audio part and the video part of the CDV disk 2 can be favorably reproduced.

According to the above arrangement, the audio / video part switching portion is detected based on the Q data QD obtained from the optical head during reproduction of the audio part of the CDV disc, so that the audio part can be changed from the audio part to the video part. Switching process, thus achieving a disk playback device with a significantly simpler configuration and higher stability compared to conventional ones using mechanical position sensors, etc. it can.

Further, according to the above-mentioned disc reproducing apparatus, since the position sensor becomes unnecessary and the mounting work and the adjusting work thereof become unnecessary, the work efficiency can be remarkably improved in the manufacturing process and the cost can be easily reduced. .

In the above-described embodiment, the case where the switching from the audio part to the video part is performed in the disc reproducing apparatus has been described. However, the present invention is not limited to this, and is also applicable to the case where the switching from the video part to the audio part is performed. it can. Incidentally, in this case, in the audio part / video part switching processing program SP1, the step SP2 is changed so as to judge whether it is near the end of the video part, and in the step SP8 and the step SP9, the head position of the audio part is changed. What is necessary is just to change it so that it may detect and move the optical head 3.

In the above-described embodiment, the case where the present invention is applied to a disc reproducing apparatus for reproducing a CDV disc as a disc-shaped recording medium has been described. However, the present invention is not limited to this. For example, another optical disc, a magneto-optical disc, or a magnetic disc may be used. Thus, the present invention can be widely applied to a disc reproducing apparatus that reproduces an audio information recording area in which audio information is recorded and an audiovisual information recording area in which audiovisual information is recorded.

H Effects of the Invention As described above, according to the present invention, a disc having an audio-visual information recording area in which audio information is recorded together with first address information and an audio-visual information recording area in which audiovisual information is recorded together with second address information In a disk reproducing apparatus for reproducing a state recording medium, the first address information (or the second address information) is reproduced from the pickup for reproducing the auditory information recording area (or the audiovisual information recording area), so that the reproduction information is reproduced. The position of the pickup can be detected based on the audio information and the boundary between the audio information recording area and the audiovisual information recording area can be detected without using a mechanical position sensor or the like, and the pickup can be detected in the audio information recording area (or audio information recording area). ) Can be easily realized.

[Brief description of the drawings]

FIG. 1 is a system diagram showing one embodiment of the present invention, FIG. 2 is a flowchart showing an audio part / video part switching processing program, FIG. 3 is a schematic diagram showing details of Q data, and FIG. FIG. 4 is a characteristic curve diagram showing a relationship between a position of an optical head on a disk and a rotation speed of the disk. 1 ... Disc playback device, 2 ... CDV disc, 3 ...
Optical head, 4 demodulation circuit, 5 traverse count circuit, 6 Q data extraction circuit, 7 control circuit, 8
... Spindle motor drive circuit, 9 ... Optical head drive circuit, 10 ... Spindle motor, QD ... Q data.

Claims (1)

(57) [Claims] 1. An audio information recording area in which first address information and audio information are recorded and an audio information recording area in which second address information and audio information are recorded are formed with a predetermined non-signal portion interposed therebetween. In the disc reproducing apparatus for reproducing the disc-shaped recording medium, the audio information recording area and the audiovisual information recording area are recorded based on the first address information or the second address information obtained from the pickup being reproduced. When it is determined that the pickup is close to the boundary of the above, a signal that crosses a predetermined number of tracks that jumps over the no-signal portion is supplied to the pickup, so that the pickup is stored in the audiovisual information recording area or the audio information recording. A disc reproducing apparatus characterized in that it is moved to an area.