JPS60151869A - Video disk player - Google Patents

Abstract

PURPOSE:To make a player main body stop its reproducing action automatically at the time of completion of reproduction of an object chapter by utilizing a mute signal outputted at the time of chapter reseach. CONSTITUTION:In case only an object chapter is desired to reproduce, a mode selecting switch 1 is connected to a contact point side (a). Then a mute signal (high level) is applied to a terminal 10, and a player main body is brought into the repeat reproduction condition. Thus, after the player main body has accessed to the object chapter and reproduced it searches a head of the chapter because of the repeat reproduction condition. At this time, pictures and signals become the mute condition again. Namely, a mute signal turns out to be a high level again from a low level, and by this level change, the 2nd monostable multivibrator 6 operates and outputs a pulse signal showing completion of reproduction. By adding this pulse signal to a switch 9, the player main body decides completion of reproduction and a reproducing action of a disk is terminated.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a disk-shaped recording medium (hereinafter abbreviated as disk).
The present invention relates to a video disc player that reproduces and demodulates video signals recorded on a disc.

Conventional configuration and its problems 2 ・ ・ Oval pits are carved with a laser on the surface of a conductive disk, and the minute signal of capacitance generated between the electrode of the playback needle and the disk is converted into an electrical signal. In a so-called grooveless capacitance type video disc player that plays back video signals, it is possible to play back any pre-designated chapter using address data recorded within the vertical blanking period of the video signal.

However, in this case, there is a problem in that even after the signal of the designated chapter has been reproduced, if there is a recorded video signal on the disc, the player continues to reproduce the signal. For this reason, in order to prevent signals other than those specified from being played, conventionally it is necessary to perform complicated operations such as re-specifying other chapters or manually instructing the specified chapter playback path and end. .

OBJECTS OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a player with good operability that automatically ends the playback operation when the signal playback of a designated chapter ends.

DESCRIPTION OF THE INVENTION The video disc player according to the present invention focuses on the fact that video and audio are muted when performing a chapter search, and utilizes signal changes when video and audio are muted. When data is detected, the player is put into repeat playback mode, and after accessing and playing the specified chapter, when the video and audio are muted again, this mute signal change is used to signal the end of playback. The playback operation automatically stops when the playback of the target chapter is finished, which is extremely convenient in practice.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a circuit diagram of the main parts of a player according to an embodiment of the present invention. In the figure, 1 is a mode selection switch, and when a movable contact is connected to contact a, a desired chapter can be played. When connected to the contacts, it will be in normal playback mode.

2 is the first monostable multivibrator, which is triggered by the falling edge of the signal input through contact a, and the output terminal Q
A pulse signal having a pulse width determined by the time constant of the capacitor 3 and the resistor 4 is output.

Reference numeral 6 denotes a switch connected in parallel with a repeat switch (not shown) on the main body of the player, and the output pulse signal of the monostable multi-vib break 2 is applied to this switch 5.

Therefore, when the pulse signal is outputted, the switch 6 is activated and the player body enters the repeat playback state.

6 is a second monostable multivibrator, which is triggered by the rising edge of the signal input through contact a, and output terminal Q.
A pulse signal having a pulse width determined by the time constant of the capacitor 7 and the resistor 8 is output. 9 is a switch connected in parallel with the eject switch (not shown) on the player main body;
The output pulse signal of the second monostable multivibrator 6 is applied to this switch 9. Therefore, when a pulse signal is output from the second single-wire brake 6, the switch 9 operates and the player determines that playback has ended.
Ends the disc playback operation.

Next, the operation will be explained in detail using FIG. As described above, when it is desired to reproduce only the desired chapter, the mode selection switch 1 is connected to the contact a side. Here, the player main body is configured to mute the video and audio until the chapter is accessed when receiving a reproduction instruction for an arbitrary chapter, and to cancel the muting after the access is made.

This mute signal (high level) is applied to the terminal 1o.

That is, as shown in Fig. 2, when the access to the specified chapter starts, the mute signal changes from the HI level to the LOW level, and the mute signal changes from the HI level to the LOW level.
The change to -+L level triggers the first monostable multivibrator 2 to generate the pulse signal shown in FIG. 2, which is applied to the switch 5. I wanted to do it. - Your player is in repeat play mode.

Due to this, the player main unit can play the desired chapter 6 page.
After accessing and playing 7, the start position of the chapter is searched again because it is in a repeat playback state. At this time, the video and audio will be muted again. That is, the mute signal rises again from the LOW level to the HIGH level, and this level change causes the second monostable multivibrator 6 to operate and output a pulse signal indicating the end of reproduction as shown in FIG. When this playback end signal is applied to the switch 9, the player body determines that playback has ended, and ends the disc playback operation.

Effects of the Invention As described above, according to the present invention, the playback operation of the player body is automatically stopped when the playback of the target chapter is finished, using the mute signal output when performing a chapter search. This makes it extremely convenient in practice.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a video disc player according to an embodiment of the present invention, and FIG. 2 is a waveform diagram for explaining the operation of FIG. 1. 1...Mode selection switch, 2,6...
・Monostable multi-by-break, 5. Old...Switch connected in parallel with the repeat switch, 9...Switch connected in parallel with the take-out switch. Name of agent: Patent attorney Toshio Nakao and 1 other person @1
figure

Claims (1)

[Claims] The player body detects the level change of the signal which is at the first level when searching for the specified chapter, and changes to a second level different from the first level when the search ends and access to the specified chapter begins. a repeat playback state; and a means for detecting a change in the signal from the second level to the first level when the playback of the designated chapter is completed, and outputting a pseudo video end signal to cause the player main body to playback. A video disc player comprising means for stopping.