JPH087895B2 - Magnetic recording / reproducing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus having a simple and highly accurate editing function.

Conventional technology Recent video tape recorder (hereinafter abbreviated as VTR)
Have been widely spread to general households, and many households have more than one. In addition, VTR integrated cameras are becoming more popular. In this situation, tape editing opportunities are increasing. Conventionally, when editing on a popular machine that does not have an editing function, the VTR on the recording side is temporarily stopped (hereinafter REC P
It was a method of manipulating both VTRs in a timed manner, with the VTR on the playback side paused (hereinafter abbreviated as STILL) in the AUSE state.

Further, in a high-end machine equipped with an editing function, serial signals or a large number of parallel signals are connected using a remote control terminal or an editing terminal, and highly accurate editing can be performed by complicated editing control.

However, in the editing method in which a person operates the VTR in a timely manner, a delay occurs by the time when the servo circuit performs the synchronous operation at the start of editing. Therefore, there is a problem that the reproduced image is not recorded only during the delay time.

In addition, high-end machines that have editing functions can perform high-precision editing, but due to factors such as higher costs, more complicated operations, and deterioration in image quality and sound quality due to serial signal noise, they are becoming popular at low prices. The machine had a problem that it was difficult to introduce.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a magnetic recording / reproducing apparatus capable of highly accurate editing by a simple operation and a simple control.

In order to achieve this object, the magnetic recording / reproducing apparatus of the present invention has an external terminal having two or more signal lines, and at least a command transmission capable of transmitting a command of recording, reproduction, stop, and pause. An apparatus, a signal line connected to the external terminal, and the command sending device are connected together, and the system control means controls the operation mode based on the information sent from each device.

Effect The present invention has the above-described configuration, and when two VTRs are connected to each other's external terminals, the editing of both VTRs can be controlled by operating one of the VTRs, and highly accurate editing can be performed easily. It can be done.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a magnetic recording / reproducing apparatus according to an embodiment of the present invention during editing. In FIG. 1, 1 is an editing VTR, 2 is a reproducing VTR, 3 is a connecting cord for connecting an editing VTR1 (hereinafter abbreviated as VTR1) and a reproducing VTR2 (hereinafter abbreviated as VTR2), and 4,5 are mutually connected. External terminal to which the signal line for inputting / outputting the operation mode of is connected, 6,
7 is system control means, 8 and 9 are KEY input operation parts, 1
0,11 is the system control means for the command input by KEY
Command sending means for sending to 6, 7.

The operation of the magnetic recording / reproducing apparatus of the present embodiment configured as described above will be described below with reference to FIGS. 2 (a) and 2 (b).

As shown in Fig. 1, connect two VTRs using the external terminals, set VTR1 to REC PAUSE and VTR2 to STILL to put them in the edit standby state. Editing starts from this state, but first
A method of controlling VTR2 by operating VTR1 will be described with reference to FIG.

FIG. 2A is a timing chart of signals for inputting / outputting the operation modes of two decks through an external terminal and a graph showing the relative position of the tape during editing.

The signal () is an output signal of the VTR 1 and is controlled by the system control means 6 of FIG. 1 so that the level from the start to the end of editing is at "L" level, and the rest is at "H" level. Similarly, the signal () is an output signal of VTR2, and is controlled by the system control means 7 in FIG. 1 so as to be at "H" level during STILL or preroll operation and at "L" level in other cases.

When the VTR1 pause switch (hereinafter abbreviated as PAUSE switch) is pressed from the edit standby state to start editing, the VTR1 sets the signal (a) to the "L" level and enters the recording standby state. During that time, the VTR 2 inputs the signal (), the system control means 7 recognizes that the signal () has become "L" level, and starts the pre-roll operation.

The pre-roll operation is the operation of rewinding the magnetic tape (hereinafter abbreviated as tape) at the playback speed for the period of t1 in FIG. 2 (a) and immediately starting playback, which was stopped by STILL first. The pre-roll operation is complete when the tape position is played back. Note that t2 in FIG. 2A is a time sufficient for the servo circuit built in the VTR2 to lock the phase, and t1 is a time not less than t2.

By setting t1 and t2 in this way, accurate editing can be performed.

VTR2 sets the signal () to "L" at the same time the preroll operation is completed
Set to level and continue playback. During that time, the VTR 1 inputs a signal (), the system control means 6 recognizes that the signal () has become "L" and starts recording.

The above is the method of controlling VTR2 by operating VTR1.

Next, a method of controlling VTR1 by operating VTR2 will be described with reference to FIG. FIG. 2B is a graph showing a timing chart of signals for inputting and outputting the operation modes of two decks through the external terminals and a tape position at the time of editing, as in FIG. 2A.

The signal () is an output signal of the VTR2 like the signal (), and is controlled by the system control means 7 of FIG. 1 so as to be at “H” level during STILL or pre-roll operation and at other “L” level. ing.

The signal () is the output signal of VTR1 like the signal (). It is set to "L" level until the editing end command is received after receiving the editing start command of VTR2, and the others are set to "H" level. It is controlled by the system control means 6 in the figure.

When the VTR2 PAUSE switch is pressed from the edit standby state to start editing, the VTR2 sets the signal () to the "L" level and stops in the playback standby state. Meanwhile, VTR1
When the signal () is input and the signal () becomes "L", the system control means 6 recognizes it and sets the signal () to "L" level to enter the recording standby state. The VTR2 recognizes that the signal () has become "L" level and starts pre-roll operation.

Hereinafter, the editing operation is continued until the PAUSE switch of the VTR2 is pressed in the same manner as the VTR2 is controlled by the operation of the VTR1 described above. When the PAUSE switch of VTR2 is pressed, V
TR2 becomes STILL immediately and the signal () is set to "H" level. VT
R1 recognizes that the signal () has become "H" level by the system control means 6 and enters the REC PAUSE state, that is, the edit standby state. Note that t1 and t2 in FIG. 2 (b) are the same as t1 and t2 in FIG. 2 (a).

The above is the method of controlling VTR1 by operating VTR2.

Next, the processing performed by the system control means 6 and 7 will be described with reference to FIG.

FIG. 3 is a flow chart for executing editing.

In the branches 100, 118, 124, 129, 135, 140, the editing operation processing is branched according to the mode number. What is a mode number?
This is for recognizing which of the four signals (), () and () is being output, and mode 0
The mode number is determined by the process of.

When the mode number is 0, the branch 100 advances to the branch 101 to determine whether or not the edit standby state is set. If the mode is standby, the branch 102 determines whether or not the PAUSE switch is pressed. If the mode is other than the edit standby, the mode number is reset in processing block 110 and the processing of mode 0 is repeated.

When the PAUSE switch is pressed, the branch 103 discriminates whether it is a reproducing system or a recording system. If it is a reproduction system, processing block 10
The mode 3 is set at 4 and the signal (II) is set at the processing block 105.
After resetting, the process block 106 enters the reproduction standby state. If it is a recording system, the mode 1 is set in the processing block 107, the signal (I) is set to the "L" level in the processing block 108, and then the recording standby state is set in the processing block 109. The signal (I) in FIG. 3 is the output signal of the editing VTR, and the signal (II) is the output signal of the reproducing VTR.

If the PAUSE switch is not pressed, the process proceeds to branches 111 and 112, and it is determined whether either of the signals (I) and (II) has become "L" level. When the signal (I) is at "L" level, the processing block 116 sets the mode 2 and the next processing block 117 issues a preroll start command. Also,
When the signal (II) is at the "L" level, the processing block 113 sets the mode 4 and the next processing block 114 sets the signal (I) to the "L" level, and then the processing block 115 issues a recording standby command. put out. Otherwise, branch 102
The following processing will be repeated. That is, both decks are in the edit standby state, waiting for the PAUSE switch to be pressed.

Here, mode 1 is a mode for outputting the signal () shown in FIG. 2 (a) for performing control processing of the playback VTR as the editing VTR, and mode 2 is for playing the VTR according to the command of the editing VTR. This mode is for outputting the signal () in FIG. Mode 3 is a mode for outputting the signal () shown in FIG. 2 (b) for controlling the editing VTR as a reproducing VTR, and Mode 4 is a reproducing VTR according to the command of the reproducing VTR. This mode is for outputting the signal () in FIG. 2B for performing the above processing. Mode 5 is a mode in which processing for ending editing is performed.

When the mode number is 1, branch 118 proceeds to branch 119 to determine whether the signal (II) is at "L" level. If it is at "L" level, the process proceeds to branch 120, and in other cases, the operation mode is checked in processing block 123 to prevent malfunction. If it is wrong, set the correct mode. branch
At 120, it is determined whether the operation mode of the VTR is REC PAUSE. If it is other than REC PAUSE, the process proceeds to processing block 123. If it is REC PAUSE, a recording start command is issued in processing block 121, and the process proceeds to processing block 122 to set mode 5. When the mode number is 2, the branch 124 advances to the branch 125 to determine whether the preroll operation is completed. If the preroll operation is completed, the signal (II) is set to the "L" level in the processing block 126, and the mode 5 is set in the processing block 127. If the preroll operation is not complete, processing block 128 checks the operating mode.

When the mode number is 3, the branch 129 determines in the branch 130 whether the signal (I) is "L". If it is at "L" level, processing block 131 issues a pre-roll start command, and then processing block 132 issues a signal (I
After setting I) to the “L” level, processing block 133 goes to mode 2
Is set. If the signal (I) is at "H" level,
At operation block 134, the operating mode is checked. When the mode number is 4, branch 135 advances to branch 136 to determine whether the signal (II) has changed from "H" level to "L" level. Signal (II) is "H"
If the level has changed to "L" level, the processing block
A recording start command is issued in 137, and mode 5 is entered in processing block 138.
Is set. Otherwise, processing block 139 checks the operating mode.

When the mode number is 5, branch 140 proceeds to branch 141 to determine whether the PAUSE switch has been pressed. If it is pressed, the processing block 142 sets the edit standby state, and the processing block 143 sets the mode 0. If not, processing block 144 checks the operating mode.

If the mode number is other than 0 to 5, processing block 145 checks the operation mode and processing block 1
Mode 0 is set at 46.

The processing described above is incorporated in the system control means.

As described above, according to the present embodiment, by providing the external terminal having two signal lines and the system control means having the above-described processing built-in, it is possible to perform accurate editing from both VTRs by a simple operation.

EFFECTS OF THE INVENTION As described above, the present invention is connected to an external terminal having two or more signal lines, at least a command sending device capable of sending commands for recording, reproduction, stop, and pause, and the external terminal. Realize high-precision editing with simple and inexpensive equipment by simple operation by providing a system control means that connects the signal line and the command sending device together and controls the operation mode based on the information sent from each It is possible, and its practical effect is great.

[Brief description of drawings]

FIG. 1 is a block diagram of a magnetic recording / reproducing apparatus according to an embodiment of the present invention during editing, and FIGS. 2 (a) and 2 (b) are timing charts of output signals of the embodiment and relative positions of tapes. FIG. 3 and FIG. 3 are flow charts of the editing process incorporated in the system control means of the embodiment. 1 …… Editing VTR, 2 …… Playback VTR, 3 …… Connection cord, 4,5 …… External terminals, 6,7 …… System control means, 8,9 …… KEY input operation part, 10,11 ...... Command sending means.

Claims (2)

[Claims] 1. An external terminal having two or more signal lines,
At least a command sending device capable of sending a command for recording, playing, stopping, and pausing, a signal line connected to the external terminal and the command sending device are connected together, and when the pausing is released in the edit standby state, the playing is performed. If the recording side is the recording side, the reproduction operation is started after the rewinding operation, and the operation completion signal is sent to the signal line when the position of the temporary stop is almost reached, and if the recording side, the operation completion signal is detected. A magnetic recording / reproducing apparatus comprising: a system control means for controlling an operation mode so as to start an operation. 2. A magnetic recording / reproducing apparatus according to claim 1, further comprising system control means for transmitting an operation mode command to a recording / reproducing apparatus connected to an external terminal.