JPS60103556A - Synchronizing operating device of video disc player - Google Patents

Abstract

PURPOSE:To attain simply and accurately synchronizing operation by controlling a slave player so as to make a polarity switching control signal for tracking and the same kind of control signal in the slave player zero in phase error. CONSTITUTION:A master player 36 detects and FP3 signal of a disc 28 and also an address signal 40 via an address detection circuit 32. The FP3 signal and the address signal are detected similarly by the slave players 37, 38, and signals from the slave players 37, 38 and a signal from the master player 36 are compared by a phase comparator 42 and an address comparator circuit 44, an output of the phase comparator 42 is feed to a motor control circuit 46 so as to control that the phase difference of the rotating phase of a motor 48 is made zero via a motor drive circuit 47. A signal corresponding to the difference of the address signal of the output of the address comparator circuit 44 is fed to a tracking control circuit 45, and the tracking control is applied so that the detection address signal of each slave player is coincident with the detected address of the master player 36.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to synchronized operation *rl!t in which a plurality of VHD type video disk players I are arranged and operated with a correlation between each player.

Conventional configuration and its problems Conventionally, (1) there is no device for arranging a plurality of HD video disc players (each player A7 plays a disc and synchronizes the players).

However, the following method can be considered as a method for driving in the 15th direction. As shown in FIG. 1, a necessary number of slave players are provided which are operated in synchronization with a master player serving as a reference. In the master player 10, the pickup 2 reads the signal on the disk 1, and the demodulation circuit 3 sends the video signal @mUAt to the vertical synchronization signal separation circuit 4. One screen consists of two fields, so multiple players can use the same J! The first step is to get IJ! It is necessary to determine the vertical synchronization signals of 12 fields. Therefore, a field detection circuit 5 is installed, but since the discrimination is made by looking at the phase relationship of the narrow equivalent pulse, there is a possibility of malfunction, and a protection circuit is required to reduce such malfunction. It is. Slave player 11゜12
Among them, vertical synchronization separation circuit 1G, field detection circuit 17
vertical synchronization separation, first . 2nd field discrimination and synchronization signal supplied from master rule 1710]
2G and the phase comparator 18, and the phase error is calculated by the motor control circuit 23 (;1 and rotation ft+ll'llll
The phase of the motor 25 that drives the disc 13 via the C motor drive circuit 24 is controlled so that the phase difference of the motor 25 that drives the disc 13 becomes zero. , J, the address signal is read by the address detection circuit 8, and the slave play A/11,1
2 and read through the address detection circuit 19 in each slave drive 1no\711°12.
The address jM +322 representing the playback location of the master player 10! ] 27 is compared in the address comparison circuit 20, and if the two match, the playback head section is moved through the tracking control circuit 21 of each J and Umako. A motor control circuit for the player 10, a theta drive circuit, a motor, and a demodulation circuit for the slave player.

However, in the case of V HD 7'j type, disk 1
Four fields are recorded during the rotation, 〕・r−
Even if a field is detected, there are two each for the first and second fields, so with the above method, the probability that the master player and slave player's screens will match is 1/2, and completely synchronized operation is impossible. I can't wait.

OBJECTS OF THE INVENTION An object of the present invention is to provide a synchronized operation device for a video disc player 17 that can easily and efficiently synchronize a plurality of VTR type video A disc players.

Structure of the Invention The synchronous operation device for the video disc player Aν of the present invention is as follows:
Supplying a control signal which is recorded at one location per disk revolution and which switches two types of tracking polarity from a master player 17 of a plurality of VHD video disk stars A7 to each slave player except the master player, The phase of this is compared with the same type of control signal read out in the slave 1 player, and the rotation phase of the slave player's turntable motor is controlled so that the phase error becomes zero. I'm going to show you how R8 was built to make the rotation of X7 JDI.

Description of the embodiment V l-I D method (1) Hit A disk '7'' I
/ ttJ, ji''l□ySince it is an electrostatic capacitance suspension system, tracking control is required to make the pickup portion for signal detection follow the signal recorded on the disk. For this purpose, there are two types of control signals on both sides of the disk information 1-rack (hereinafter referred to as F1)1 signal, F12.
Rack f (referred to as No. 6) is recorded alternately on rack f (J3).
Pick up f- so that both people have the same number of novels.
Control in the radial direction of the r-splash. In order to execute this control 11, the disk cuts the axiality of both parts (λ
, I, -J' control signals (hereinafter referred to as FP3 signals)
) riia recording, and when playing back, this FI')
3 (i; No. 4 detection 1) [1: P1 icon No. during one rotation,
F1] tM is configured to switch the polarity of t+'3.

FIG. 2 shows the present invention in which a plurality of conventional 1-1D type bidets A/F/Subble-X7 as described above are jointly operated. 1.3G is a master player, and 37.38 is a slave player.

The master player 36 detects the FP3 signal on the disk 28 of the master player 36 via the FP3 detection circuit 31, and detects the address signal 40 via the address detection circuit 32.
Detect. The slave players 37.38 also detect the FP3 signal and the address signal via the FP3 detection circuit 41 and the address detection circuit 43 in the same way as the master player 3G, and each slave play 1737.38 detects the respective signal and the address signal from the master player 36. The output of the phase comparator 42 is applied to the motor control circuit 4G via the motor drive circuit 47, and the phase of the rotation of the motor 48 is determined. Control so that the phase difference becomes zero. At the same time, a signal corresponding to the difference between the address signals output from the address comparison circuit 44 is supplied to the ranking control circuit 45 to 1, and is sent to each slave play 1.
Tracking control is applied so that the detected address signal of No. 7 matches the detected address of the master player 3G.

29.30 is the big TL knob and pitching circuit of master brake 1736, 33.34.35 is master brake ~73
13 motor i! IQ 611 circuit, motor drive circuit,
There is seven-ri C. 38°39.40 is the slave player's disk, backup, and return path.

Figure 3 shows the slave player's 11th snoring diagram! l.

From the signal detected by the pickup 39, the return IPJ circuit 4
0, the signal is further separated via the t=p3 detection circuit 41, the F l''i detection 1 path 49, the FP2 detection circuit 50, and the address 18 detection 1L+1 do 1s43, and is sent to the master.
Bray iy lp et al. supplied += p 3i iJ bow 5
1 and slave 1 no \7! -1) Motor control t1111 by comparing 3 signals and phase comparison 542! ! 1st road 56 Rieru. Constant speed control 1 is carried out based on the motor 4 base only 1) ts 52, but the phase comparator 42 corrects the 4 stiffness and adjusts the reference black 52 and i(t, 411) as necessary.
5? Rotate at a certain position. On the other hand, the FPI signal, F
The P2 signal lf controls the pickup 39 in the radial direction of the disk 38 by the differential circuit 53 and the phase compensation circuit 54.

The output signal lj of the address signal detection circuit 43 is compared with the address a, and the microcomputer 55 drives the drive device 58.
The pickup 39 is forcibly moved in the radial direction via. 56 is an adder. If the difference between both address signals is large, fil WJ including the pickup 39 part
A signal for moving the J section is also given to the feed motor drive circuit 59, causing the feed motor 57 to rotate.

As described in detail, according to the synchronized operation device for a video disc player of the present invention, one
~ Control signal for polarity cutting of racking No. 13 (FP
3 signal) as an ES quasi-signal to control and synchronize the slave player so that the phase difference between the slave player and the same type of controller approaches zero, using the conventional circuit as is and using the minimum necessary Only the comparison circuit part is required,
Furthermore, reliable synchronization can be expected.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a synchronous operation device, Fig. 2 is a block diagram of an embodiment of a synchronous operation device according to the present invention, and Fig. 3 is a block diagram of a synchronous operation device.
FIG. 1 is a configuration diagram of main parts of FIG. 36...Master player, 37.38...Slave play 17.31.41-F P3 (a detection circuit, 42-4; l phase comparator, 33.46...motor control circuit agent Yoshihiro MorikiFigure 2Figure 3Figure 3'1.3B

Claims (1)

[Claims] 1. Out of a plurality of VHD video disc players, a control signal is transmitted from the master player to each slave player other than the master player to switch the polarity of the two types of 1 to 1 king signals recorded at one location per rotation of the disk. This is compared with the same type of control (g (75) read out in the slave player, and the phase of the turntable motor of the slave player is controlled so that the phase error becomes zero. In order to synchronize the rotation of both the master and slave brakes 12 (111), the bidet sub disc play 17's Ii1 period';4iSlλ'
1'! i i+'! +1