JPS60167148A - Video reproducing system of series alternating operation - Google Patents

Abstract

PURPOSE:To obtain an inexpensive video reproducing system of series alternating operation by holding a pair of video reproducing devices after rewinding operations and transmitting reproducing command signals to video reproducing devices of each other. CONSTITUTION:At a start time t0, soft tapes are set to starts in video reproducing devices 10 and 11, and the video reproducing device 10 is allowed to start reproducing. At a time t1 of the tape start or the terminal of a control pulse, these devices start rewinding operations and command reproducing to each other by a reproducing control part and stop by the tape start to enter into the holding state for receiving reproducing commands. Then, the video reproducing device 11 is set to the play mode, and the video reproducing device 10 is set to the standby state. At a time t2 of the terminal of the soft tape in the device, which executes reproducing, or the terminal of the control pulse, these devices start rewinding operations and issue reproducing commands to each other by reproducing control part. Thus, pictures are transmitted continuously without interruption by two video reproducing devices.

Description

[Detailed Description of the Invention] Industrial Field of Application This invention is suitable for use as a software transmitter for in-house independent programs at hotels or for shows at department stores, etc. The present invention relates to a serial alternating operation video playback system that reproduces and sends out the same soft tape.

Conventional configuration and its problems Two video playback devices are used to send out internal independent programs at a hotel, and by playing the same soft tape in continuous alternating operation, the program is supplied without any video breaks. This is commonly done. As shown in FIG. 1, this type of device generally uses a professional video playback device 1.2 with a 34P control terminal, and a control unit 3 controls the two video playback devices. It is being done. 4 is the monitor TV, 5.6 is the video and audio output line, 7 is 3
4P control line and 8.9 are video and audio output lines.

However, this series alternating operation video playback system has the disadvantage that the video playback devices 1 and 2 are products exclusively for business use, and the control section 3 is required, resulting in a very expensive system 7. Originally, a professional video recording and reproducing apparatus having 342 control terminals performs various remote controls and editing controls, and it is a complicated and expensive system to perform such simple control.

OBJECTS OF THE INVENTION The purpose of the invention is to provide a series alternating video playback system that can be made more inexpensive.

Structure of the Invention The present invention is characterized in that a pair of video playback devices are each provided with a tape end detection section, and are allowed to perform a rewinding operation and standby, and each sends a playback command signal to the other video playback device for playback operation. .

As a result, continuous alternate operation can be performed using a general video reproducing device, and the cost can be reduced.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention is shown in FIGS. 2 through 6. Second
In the figure, 10.11 is a video playback device having a tape end detection section, 12.13 is a playback command control line, and the playback command signal is transmitted to the other party's video playback device through this playback command control line 12.13. , continuous alternating operation. Third
To explain the operation of this system using the diagram, first, start t.

At this point, both of the video playback devices 10 and 11 start playing the soft tape, and one of the video playback devices 10 starts playing. When the end of the tape or the end of the control pulse reaches time t1, the self starts the rewinding operation and instructs the other device to play through the playback control section, and stops at the beginning of the tape and receives the playback instruction. Go into standby mode. In this way, the video playback device 11
PLAYJ and video playback device 10 are rsTANBYJ
becomes. When the end of the soft tape being played back or the end of the control pulse comes to time t2, the soft tape itself enters a rewinding operation and issues a playback command to the other side from the playback control section. In this way, 2
This makes it possible to continuously transmit video without interruption on the same video playback device. .

FIG. 4 shows the specific configuration of one of the video playback devices.

That is, A is a reproduction command transmission/reception control section. B is a control pulse signal, and C is a power supply detection section for enabling external timer reproduction. Now, considering the case where a soft tape is continuously played back from the beginning to the end, when the end is reached in the playback state, the light from the emitting diode LED is detected by the start and end detection section 16.
(phototransistor) and its output (Figure 5 (
a)) in the same figure (bl to dl) to create a one-shot pulse, issue a rewind command to the system control microcomputer 26, drive the end detection playback control section 19, and switch. A playback command is issued to another video playback device via the switch 20.This causes the other party's system control microcomputer to operate the playback by giving the number of points in the playback instruction.On the other hand, playback commands from another video playback device The signal is sent from the transmission control unit A to the system control microcomputer 26 via the pulse shaper 21 for reproduction operation.The pulse shaper 21 is composed of an operational amplifier that shapes pulses with a certain time constant as shown in FIG. Reference numeral 25 denotes a keyboard section which is configured so that a microcomputer reads pulse intervals corresponding to each mode and issues commands for each mode.

Next, when the end of the control pulse is detected and continuous reproduction is to be performed, the changeover switch 20 is switched to the dashed line side. The control pulse signal B in Fig. 4 (Fig. 5 (e)) is detected by the control pulse control rewinding command section 23, which is a tape end detection section, and the time constant of the built-in one-shot multivibrator circuit is increased to some extent. A high voltage is maintained as shown in Fig. 5(f), and a delayed pulse (Fig. 5(g)) is generated at the falling edge when the control pulse disappears.
A pulse ((h) in the same figure) is output, and this signal is sent to the system control microcomputer 26 to perform a rewind operation, and by driving the playback control section 22, the other party's video playback device is caused to playback.

In addition, in order to perform continuous alternating operation only for a certain time every day using an external timer, turn on the switch 27, detect an appropriate voltage when the power is turned on by the power supply detection section C, and then use the regeneration control faIt section 24 to perform regeneration. This can be achieved by making the user perform an action.

In addition, 15 is a start/end detection unit (phototransistor) that detects the light of the emission diode LED, 17 is a start/end detection regeneration control unit, and 18 is an auto-repeat on/off switch. This is to perform auto-repeat operation between the control pulse and the end of the control pulse, and is not directly related to the present invention.

Effects of the Invention According to the present invention, by adding a simple circuit to a general video playback device, continuous alternating operation can be performed at low cost with a simple system consisting of only two main devices, and the effect is significant. be.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a conventional system, Fig. 2 is a block diagram showing the concept of an embodiment of the present invention, Fig. 3 is an explanatory diagram of its operation, and Fig. 4 is a concrete configuration of one video playback device. The block diagram, FIG. 5 is an explanatory diagram of the signal processing operation of the start/end detection section 16 and the control pulse control rewind command section 23, and FIG. 6 is a specific circuit diagram of the input section of the system control microcomputer. LED...Issuing diode, 10.11...Video playback device, 16...Start end end detection section (tape end detection section), 19...End detection playback command section (playback control section), 2
2...Return ff1lJ control section, 23...Control pulse control rewind command section (tape end detection section), 24
...Power detection regeneration control unit, 26...System control microcomputer Fig. 1 6 12 13 Fig. 2 Fig. 3 Fig. 4 Fig. 5

Claims (1)

[Scope of Claims] (11) A pair of video playback devices configured to wait at the beginning of a tape, perform a playback operation in response to a playback command signal, and perform a rewind operation upon detecting the end of the tape by a tape end detection section;
A series alternating operation video playback system comprising: a playback control section that is provided in each of the pair of video playback devices and transmits the playback command signal to the other end of the video playback device based on the detection operation of the tape end detection section. (2) The serial alternating operation video playback system according to claim 11, wherein the tape end detection section optically detects the end of the tape. (3) The tape end detection section detects the end of the control pulse. The series alternating operation video playback system according to claim 111. (4) The pair of video playback devices operate in conjunction with an external timer power supply device. Driving video playback system.