JPS6345983A - Video signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To output an excellent picture by switching the state of a circuit when a source device is in search state and an editer device is in E-E (input signal is processed electrically and outputted) state or simultaneous reproduction. CONSTITUTION:When the state is neither in E-E nor in simultaneous reproduction, an output of a gate 14 always goes to a high level, a signal 7 representing the search state is sent as it is to a PLL, signal processing circuits 10 and 11 in a TBC (time base correction device) 8. When a signal 1 representing the search state of the source device is applied to the terminal 1, the signal 12 goes to a low level land the output of the gate 14 goes to the low level and the output of the gate 15 goes to the low level and the circuits 10, 11 are switched from the normal state to the search state. Thus, excellent operation is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention can be used in video signal recording and reproducing devices such as VTRs, and peripheral equipment such as time base correctors (TBCs) and frame synchronizers.

Conventional technology When dubbing a video signal with a VTR, etc., the playback deck (source device) is in the search state, and the recording deck (editor device) is in the g-E (input signal is processed and output). There is a state in which the recording is being performed (recording and simultaneously outputting the reproduced signal to the monitor). In such a case, if a signal with a noise band is output from the source device, the editor device will not be able to distinguish the vertical sync signal due to this noise band, the servo will not be applied, and the source device will then play normally. When the editor machine starts recording, it takes time for the servo to start up, making it impossible to edit accurately. The problem is, when the editor has a TBC (time base corrector) and outputs a video signal whose vertical synchronization signal is synchronized with the input video signal, the reference vertical synchronization signal cannot be created correctly, and the vertical The image may move up and down. To prevent this phenomenon, M117 AU-60
0, when dubbing is performed by receiving an output from the source device that does not pass through TBCi, when the source device enters search mode, the servo of the editor device is activated using a signal (frame signal) related to the vertical synchronization signal of the output video signal sent from the source device. I am trying to create a standard and a vertical standard for the TBC. Also, when the editor or recording/playback device is in the search mode, the frequency of the horizontal synchronization signal to be played will be quite different from that of normal playback depending on the speed, and it will jump suddenly after the noise bar. or Therefore, at the time of search, by switching the configuration and time constant of the PLL circuit for creating the TBC write clock from those for normal playback, a configuration is created that creates a clock that accurately follows the playback signal during normal playback, and when searching, I try to select a clock creation method that is resistant to noise bars and steep time fluctuations. Furthermore, during a search, various other video signal and other signal processes, such as switching between black and white mode and color mode, switching between interpolation processing, etc., are switched from those during normal playback.

FIG. 3 shows an example of switching during a search as described above and will be described. In Figure 3, 1 is a search reference signal from the source device (input terminal), 2 is a composite synchronization signal separated from the input video signal (input terminal), 3 is a signal detector, 4 is a frame detector, and 5 is a switch. , 6 is a servo circuit, 7 is a signal indicating a search state, 8 is a TBC 19 is a reference signal generator, 1o
1 is a PLL and TBC signal processing circuit, and 11 is another signal processing circuit. The search reference signal 1 is transmitted to the terminal 1 only when the source device is searched. Shin 43,
The WJ output device 3 determines the presence or absence of the search reference signal 1. For example, when the search reference signal 1 is present, its output 12 is at a low level, and when it is absent, the output 12 is at a high level.

During normal normal signal recording (E-E, including simultaneous playback)
Since there is no signal at terminal 1, the output 12 of signal detector 3 becomes high level, switch 5 is connected to the H side, and terminal 2
The servo circuit 6 and the reference signal generator 9 in the TBCB are controlled by the composite synchronizing signal 2 separated from the input video signal and the frame signal generated by the frame detector 4 applied to the servo circuit 6 and the reference signal generator 9 in the TBCB. 1, the signal 7 indicating the search state is the normal 1112 record [1+raw U:; becomes high level, and the PLL
The signal processing circuit 10 and the signal processing circuit 11 are set to a normal state. When the source device enters search mode, a signal representing a frame of the source device's output video signal (reference signal of the source device's playback servo, Heritos 6 - itching signal, etc.) is transmitted to terminal 1, and output 1 of signal detector 3 is transmitted to terminal 1.
2 is at Mr. Lee's level, the switchboard 5 is connected to the H side, and during E-E and simultaneous playback, the servo circuit s and the reference signal generator 9 in the TBC are controlled by the reference signal 1 from the source device. Therefore, it is not disturbed by noise bars in the input video signal. During a search, the signal 7 goes to L level, and the time constant and configuration of the PLL in the circuit 10 and the various signal processing circuits 11 are switched to the normal state to correspond to the search.

Problems to be Solved by the Invention In the configuration shown in FIG. 3, when the editor or recording/playback device enters the search state, the PLL and other signal processing circuits in the TBC are switched to search mode, but the source You cannot switch when the machine is search and the editor machine is E-4 or simultaneous playback. However, in this case as well, since the same signal as in the search state is input to the TBC and other circuits, the operation becomes unstable. Furthermore, in the case of a configuration in which the VTR and TBC are separate units and used while being connected, it is necessary to exchange many signals with each other. In such a case, especially in the case of a portable VTR, it is desirable to have maximum functionality with as few signals as possible in view of connector space and the like.

In view of these points, the present invention has been developed to obtain a normal image even when the source device is in search and the editor device is in E-E or simultaneous playback, and provides sufficient functionality by minimizing the connection between the VTR and TBC. The purpose of this invention is to provide a device that allows this process to be performed.

In order to solve the problem more than just a means to solve the problem, the present invention provides the following features: ■ When the source device is in the search state and the editor device is playing back E and E at the same time. In either case, there is a means for replacing the PLL and other circuits of the TBC of the editor or recording/playback machine for normal playback.

Furthermore, the present invention provides: (1) a signal indicating that the source machine is in a search state and the editor machine is in E-E or simultaneous playback; and (2) when the editor machine or recording/playback machine is in a search state;
It has means for outputting a signal (frame signal) related to the vertical synchronization signal of the output video signal as one signal to a peripheral device such as an editor or a TBC.

Furthermore, the present invention provides a signal from the editor or recording/playback device that indicates that the source device is in a search state and the editor is in E-E or simultaneous playback; The apparatus has means for receiving a signal indicating the state of the TBC and switching the state of the PLL and other circuits of the TBC to that of normal reproduction.

In this way, not only when the editor machine or recording/playback machine is in the search state, but also when the source machine is searching and the editor machine is playing E-E-i simultaneously, can be improved by switching the circuit state. It is possible to output images. In addition, two or more types of signals are transmitted as one signal,
Full functionality can be achieved with minimal connections.

Embodiment FIG. 1 shows a diagram of an embodiment of the present invention and will be explained. In FIG. 1, the same numbers as in FIG. 3 represent the same things and perform the same operations. 13 is a signal indicating E-E-i or simultaneous reproduction; in the example of FIG.
When E-j or simultaneous playback, the level becomes low. 14 is OR
Gate 15 is an AND gate. When signal 13 is high level, not E-E or simultaneous playback, gate 1
The output of signal 4 is always at a high level, and the signal 7 indicating the search state is transmitted as is to the PLL, signal processing circuit 10, and signal processing circuit 11 in TE01, and the same operation as in the example of FIG. 3 is performed. When signal 13 is low level, i.e. E-E
-i or at the time of simultaneous reproduction, when the signal 12 becomes low level, the output of the gate 14 becomes low level, and therefore the output of the gate 16 also becomes low level, and 10. The circuit 1o and the circuit 11 are in the normal state. Switch to search state. The signal 12 becomes low level when the signal 1 indicating the search state of the source device is applied to the terminal 1. Even when the source machine is in the search state and the editor machine is in E-E or simultaneous playback, the circuits 10 and 11 are switched to the search state and can perform good operation.

Next, source machine (A), engineering f, ita machine fB),
T B Cfc) An example of the case where all cascades are connected is shown in Fig. 2,
explain. In FIG. 2, the same numbers as in FIGS. 3 and 1 represent the same things and perform the same operations. 16 is a signal related to the vertical synchronization signal of the output video signal in the search state (
frame signal) [High level or open when not searching], 17 is a switch, 1' is the output signal of switch 17 (output terminal), 1' is the output signal of switch 17 (input terminal), 18' is the output signal of switch 5 Output signal (output terminal)
, 18# are output signals (input terminals) of the switch 5.

Sui Nochi 1 of source machine (A) and editor machine (B)
7 is controlled by the output signal of the OR gate 14. Source machine (A) te 11...-.

Since no signal is connected to terminal 1 (not shown), signal 12 is always at high level, the output of gate 14 is always at high level, switch 17 is always connected to the H side, and there is no signal from terminal 1'. , a signal 16 related to the vertical synchronization signal of the output video signal in the search state is output. Editor machine F
B) receives a signal from terminal 1' of the source device (A) at terminal 1, and operates in the same way as the example shown in FIG. Editor machine (B
), the switch 17 is controlled by the output of the gate 14, and when the source device is in the search state, the editor device is connected to -1 or the clock side of simultaneous playback, and a low level signal is output from terminal 1'. be done. At other times, the switch 17 is connected to the H side, and a signal 16 related to the vertical synchronization signal of the output video signal in the search state is output from the terminal 1'. In this way, signals indicating two states are output from one terminal 1'. Further, a signal related to the vertical synchronization signal in the input video signal is output from the terminal 18'.

In T B C (C), terminal 1' receives a signal from terminal 1' of editor machine (B), and a signal related to the vertical synchronization signal of the output video signal is transmitted (editor machine is in search state). and the output of the signal detector 3 becomes low level. This signal is applied to one input of AND gate 15. In this case, signal 1# is directly applied to the other input of gate 16. Signal 1' becomes low level when the source device (A) is in a search state and the editor device is in E-K or simultaneous playback. When any input of gate 16 goes low, its output goes low, so circuit 10 and circuit 1
1 switches to search state. In other words, the editor machine is in the search state, or the source machine is in the search state and the editor machine is in the E-
During E4 or simultaneous playback, circuits 10 and 11 are in search state mode. Further, the reference signal generator 9 has a terminal 18'
A reference signal for TBG is created by receiving the signal.

The connection between the device (B) and the device (C) is not limited to the example shown in FIG. 2, but it is also effective to simply connect the device (inside the recording/reproducing device) and T B C (C).

Effects of the Invention As described above, according to the present invention, the editor machine A13.
-7 Good output images can be obtained and servo synchronization can be effectively applied not only when the recording/playback device is in search, but also when the source device is in search and the editor device is in E-E or simultaneous playback. . It is possible to achieve sufficient functionality by minimizing the number of connection lines between devices.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a block diagram showing another embodiment of the invention, and FIG. 3 is a block diagram showing a conventional example. 3...Signal detector, 10...PLL/signal processing circuit, 11...Signal processing circuit, 13...K
- K or signal indicating simultaneous playback, 14.15
...Gate, 16... Signal related to the vertical synchronization signal of the output video signal during search, 17...
・Switch, 1.1', 1"・ Search reference signal (input/output terminal). Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (3)

[Claims] (1) When dubbing or recording/playing video signals,
A video signal recording and reproducing device configured to switch the state of the circuit of an editor machine (recording deck) from that for normal recording and reproducing in any of the following cases. [1] When the source machine (playback deck) is in the search state and the editor machine is in E-E or simultaneous playback, [2] When the editor machine or recording/playback machine is in the search state, (2) When dubbing or recording/playing video signals,
A video signal recording and reproducing device characterized in that a signal indicating the following two states is output as one signal. [1] Signal indicating that the source device is in the search state and the editor device is in E-E or simultaneous playback [2] When the editor device or recording/playback device is in the search state, related to the vertical synchronization signal of the output video signal signal (3) When dubbing or recording/playing video signals,
A video signal recording and reproducing device characterized in that it receives signals indicating the following two states from an editor machine or a recording and reproducing machine, and switches the state of a circuit between that of normal recording and reproducing. [1] The source machine is in the search state and the editor machine is in E-E or simultaneous playback. [2] The editor machine or recording/playback machine is in the search state.