JPS6215976A - Character signal multiplex adaptor - Google Patents

Abstract

PURPOSE:To confirm character information generated independently of a monitor receiver by sending a generated character signal to a video camera to monitor the signal at an electronic view finder of the video camera. CONSTITUTION:When a console panel 21 is operated and a character to be displayed is designated, a character pattern generating circuit 23 generates a desired character signal and inputs the signal to a terminal 65 of an adder circuit 28. Then the signal is fed to a base of a transistor 283 for character signal addition through a resistor 281 and a capacitor 282, extracted from an emitter and outputted to the video camera 1 from a terminal 61. The signal is added to the video signal outputted from an output terminal 11 in the video camera 1, the character information is superimposed on the electronic viewfinder from an input terminal 66 of the electronic viewfinder onto the video signal, then the character to be superimposed is confirmed without any monitor receiver.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a character signal multiplexing adapter suitable for superimposing a character signal or the like onto a video signal from a video camera and recording the same.

[Background of the invention]

In recent years, along with the widespread use of video tape recorders, video cameras used in combination with video tape recorders have also become widespread, allowing users to produce desired programs by operating the video cameras themselves. In this case, if character patterns such as the title and date can be added to this program and the title and date can be displayed on the playback screen when the program is played from a video tape recorder, the same effect as that of a broadcast program can be obtained. , it is very convenient because it makes it easy to save programs and understand their contents.

For this reason, many video cameras that have recently become commercially available are equipped with a function of adding character signals to video signals. However, a video camera equipped with such a character signal superimposition function has a built-in circuit such as a character generator for this purpose, and is also provided with an operation section for performing operations such as specifying characters, which inevitably results in a large size. I end up. Usually, a video camera is used by being carried on the shoulder, which makes various operations difficult to perform and also reduces the mobility required for the video camera.

In addition to such i-video cameras, video cameras that do not have a text signal superimposition function are also popular, and when a user □ uses such a video camera to produce a program with dates and titles added, Usually, at the beginning of a program production, a board with the title and date written on it is photographed, or special equipment called a video telopper is used.

However, this is a tedious and extremely inconvenient task.

Therefore, in order to solve the above problems, a device is provided between the video camera and the video tape recorder, and a desired character signal is superimposed on the video signal output from the video camera and sent to the video tape recorder. A character signal multiplexing adapter was proposed (for example,
-27503).

FIG. 3 is an explanatory diagram showing how to use the character signal multiplex adapter, in which 1 is a video camera, 2 is a character signal multiplex adapter, 3 is a video tape recorder, 4.5 is a cable, and 6 is a video tape recorder.
is an electronic viewfinder, and 7 is a connector.

In the figure, a character signal multiplexing adapter 2 has a built-in character pattern generation circuit, character signal addition, etc., and also includes an operation panel and a cable 5 for performing operations such as specifying a character signal to be superimposed on a video signal. There is. When producing a program, connect the cable 4 from the video camera 1 to the connector 7 of the character signal multiplex adapter, and
The cable of the video camera in the video tape recorder 3 is connected to the next cable connector. Before starting program production, the necessary characters, their size and display position are specified by operating the operation panel, and when program production starts, the video camera 1 sends the designated characters to the video signal. Set the signal to 1 tatami.

If such a character signal multiplexing adapter is used, there is no need to provide the video camera with a character multiplexing function, so the video camera can be made smaller, and the character signal multiplexing adapter can be fixed to a different part of the body. Since the camera can be moved and kept separate from the video camera, the mobility of the video camera can be maintained and various operations of the video camera can be easily performed.

Further, such a character signal multiplexing adapter is capable of superimposing a title, date, etc. even after recording. This involves connecting a tape recorder equipped with a recorded magnetic tape and another video tape recorder to a character signal multiplexing adapter, playing back the recorded tape, inserting character signals into the video signal, and then transmitting the character signals to the other video tape recorder. It is to be recorded. Therefore, 1. When producing the program, the title,
You can superimpose these at any time without superimposing the date, etc., and even if your video camera does not have a text signal multiplexing function, or any video camera that does not have this function, you can add any title. , date, etc. By the way, when producing a program and superimposing 8 titles, dates, etc., it is necessary to check whether there are any errors in the characters to be superimposed. If a monitor receiver can be used to monitor the recorded image as well as the video tape recorder recording, it is possible to check the characters to be superimposed at the same time, but it is difficult to produce programs in situations where there is no monitor receiver, such as when shooting outdoors. In such cases, you can display the title, date, etc. on the screen using a conventional character signal multiplex adapter. However, there is no way to directly check whether the character information generated by this character signal multiplex adapter is correct.

For this reason, conventional text multiplexing adders cannot be used in places where there is no monitor receiver, and after recording, they have to be used in places where a monitor receiver can be used, which is inconvenient due to restrictions on the range of use. there were.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a character signal multiplexing adapter which eliminates the drawbacks of the prior art described above and makes it possible to check generated character information without using a monitor receiver.

[Summary of the invention]

To achieve this objective, the present invention is characterized in that the generated character signal is sent to a video camera so that it can be monitored by an electronic viewfinder of the video camera.

[Embodiments of the invention]

Hereinafter, embodiments of the present invention will be explained with reference to the drawings. Fig. 1 is a block diagram showing one embodiment of the character signal multiplexing adapter according to the present invention, in which reference numeral 21 indicates an operation panel;
System control 1ffi path, 220 power camera state determination circuit, 221 camera Bose signal control circuit, 222 operation key determination circuit, 223 character display control circuit, 23 character pattern generation circuit.

24 is a character signal addition circuit, 25.25' is a changeover switch.

26 is a reproduction detection circuit, 27 is a changeover switch, 28 is an addition circuit, and 61 to 65 are terminals.

In the figure, the operation pile 21 includes operation keys for pointing out the characters to be displayed, operation keys for setting the size of the characters to be displayed, the display position on the playback screen, etc. It is provided.

The operation key determination circuit 222 determines the operation key operated on the operation panel 21, and based on this determination, the character display control circuit 223 controls the character pattern generation circuit 23 to display character data, the size of the displayed character, and the display position. send a signal.

The character pattern generator 23 sends a character signal corresponding to the character data to the adder circuit 28 and the character signal adder circuit 24 at a predetermined timing for a predetermined period based on this control signal and a synchronization signal of the video signal from the video camera 1. .

When recording the video signal from video camera 1,
As explained in FIG. 3, the cable 4 from the video camera 1 is connected to the connector 7 of the character signal multiplex adapter 2, and the cable 5 is connected to the cable connector of the video tape recorder 5. An adder circuit 28. is connected between the connector 7 and the terminal 63 to which the cable 5 is connected. A changeover switch 25' is provided, and changeover switch □2
5.25' is controlled by the playback detection circuit 26, but is normally closed to the A side, and the video signal from the video camera 1 is passed through the changeover switch 251 character signal addition circuit 24. When the video tape recorder 3 is in the reproduction mode via the changeover switch 25' and the cable 5, the reproduced video signal is supplied to the character signal multiplexing adapter 2 via the cable 5, and the reproduction detection circuit 26 detects this. and switch the selector switch 25, 25' to the B side. This results in
The video signal is set by switch 25125 and cable 4.
The reproduced image can be monitored by the viewfinder 6 of the video camera 1.

When superimposing a character signal on the video signal from the video camera 1, the video tape recorder 3 is set to recording mode by the camerabose signal from the video camera 1,
The video signal is supplied to the character signal addition circuit 24 via the cable 4 and the changeover switch 25, and the character signal is also supplied from the character pattern generation circuit 23 at a predetermined timing, and the character signal is added to the video signal.

The output signal of the character signal addition circuit 24 is sent to the selector switch 25.
', is supplied to the video tape recorder 3 via the cable 5 and recorded.

The camera state determination circuit 220 and the changeover switch 27 are
A logic for determining whether the video tape recorder 3 of the video camera 1 is set to recording mode or recording standby mode is performed based on the camera BOSE signal. Further, the camera Bose signal control circuit 221 forms a camera Bose signal having the same level as the camera Bose signal outputted by the video camera 1, and sends this signal to the video tape recorder 3 via the terminal 64 and the cable 5. Camera status determination circuit 220
, for example, consists of an exclusive NOR circuit and connects the video camera 1 to the cable 4 . The camera Bose signal supplied via the terminal 62 and the voltage from the changeover switch 27 are input. In short, the camera determination circuit 220 is configured to output a ``H'' signal when the two persons' power is at the same level, and to output a 1L'' signal when the two persons' power is at different levels.

A certain high voltage is applied to the selector switch 27 on the ■ side and the O side is grounded, so that when it is closed to the ■ side, '
When the voltage of H" is closed to the θ side, a voltage of 1L" is output. Further, the character display control circuit 223 is connected to the camera determination circuit 22.
Controlled by a zero output signal.

Next, the operation of this embodiment will be explained.

When the cable 4 is connected to the cable connector 7, the cable 5 is connected to the cable connector of the video tape recorder 3, and the power is turned on in the video tape recorder 5, a signal is transmitted from the video tape recorder 3 to the video camera 1 and the character signal multiplexing adapter 2. Power supply voltage is supplied. Here, as the video tape recorder 3, the camera pause signal is
There are two types of video cameras: one that enters the recording mode when the power is "H" and one that enters the recording mode when the power is 1L. When this happens, the camera pause signal is set to "H", and for the latter video tape recorder, the camera pause signal is also set to "1L".

Here, it is assumed that the video tape recorder 5 is in the recording mode when the camera pause signal is 'H', so the changeover switch 27 is closed to the ■ side, and the changeover switch 27 outputs the camera determination circuit 220 and the camera Bose signal. The voltage supplied to the control circuit 221 is assumed to be 'H'.

Therefore, when the power supply voltage is supplied to the video camera 1, the video camera 1 outputs a 1L" camera pause signal, which is supplied to the camera state determination circuit 220 via the cable 4 terminal 62. At this time, Since the output voltage of the changeover switch 27 is 1H", the output signal of the camera status circuit 220 is 1L". Therefore, the output signal of the camera pause signal control circuit 221 is also 'L', and this is sent as a camera pause signal to the video tape recorder. 3.
The video tape recorder 3 is set to recording standby mode.

The output signal 1L" of the camera state determination circuit 220 is also supplied to the character display control circuit 223. Thereby, the character display control circuit 223 is activated.

Therefore, when the operation panel 21 is operated to specify a character to be displayed, the character pattern generation circuit 23 generates the desired raw signal, and this character signal is added to the character signal addition circuit 24, as described above. The signal is supplied to the circuit 28. Also,
When the video camera 1 is operated to start capturing images, the video signal is supplied to the character signal multiplexing adapter 2 as described above, and the video signal on which the character signal has been superimposed in the character signal addition circuit 24 is sent to the cable 5. The signal is supplied to the video tape recorder 3 via the video tape recorder 3. At this time, since the video tape recorder 3 is in the sickle picture standby mode, it does not record this video signal. However, if there is a monitor receiver, it is possible to supply the desired characters to the monitor receiver (not shown) provided on the video tape recorder 3 side, thereby adding desired characters to the image captured by the video camera 1. You can monitor the superimposed screen. While monitoring this, the user can operate the operation panel 21 to adjust the size, position, etc. of the characters on the screen.

As a reminder, the adder circuit 28 outputs a character signal to the terminal 61. This character signal is added to the video signal and supplied to the electronic viewfinder 6 of the video camera 1 via the cable 4. Therefore, the characters are displayed superimposed on the screen imaged by the electronic viewfinder 6, and thereby the characters generated by the character signal multiplexing adapter 2 can be confirmed.

Note that the character pattern generation circuit 26 has a memory function and stores character data from the character display control circuit 223, and when writing of this character data is completed,
By the read control signal from the character display control circuit 223,
Character data is repeatedly read out in synchronization with the synchronization signal. At this time, by operating a predetermined operation key on the operation panel 21, the way the character pattern generation circuit 23 reads character data is changed, and the size and display position of the character is changed.

Next, when the recording mode is specified in the video camera 1, the camera pause signal becomes 1H", and the camera state determination circuit 2
The output signal of the camera Bose signal control circuit 221 becomes 1H", and the video tape recorder 3 is set to recording mode. As a result, the video tape recorder 3 records the video signal on which the character signal is superimposed. do.

At the same time, the 'l('' output signal of the camera state determination circuit 220 is also supplied to the character display control circuit 225. As a result, the character display control circuit 223
A character pattern generation circuit 23 is prevented from being affected even if an operation key is operated to change displayed characters such as the display position of a character with a size of 0 characters. That is, when the output signal of the camera state determination circuit 220 becomes 1H" and the video tape recorder 3 enters the recording mode, the displayed characters cannot be changed at all.

The operation panel 21 is also provided with an operation key for stopping character display, and when this is operated, the operation key determination circuit 2
Based on the determination result of step 22, the character display control circuit 223 erases the character data stored in the character pattern generation circuit 23i. As a result, from then on, only the video signal from the video camera 1 is recorded by the video tape recorder 3.

In this way, the video tape recorder 3 enters the recording mode, and a text signal can be superimposed on the video signal, and a title, date, etc. can be added to the beginning of the Kagumi production.

In the above, the video tape recorder 3 is set to the recording mode when the camera Bose 4 signal is 1H", but the video tape recorder 3 is set to the recording mode when the camera Bose signal is 'L". One day, Banko turned the selector switch 27 to O.
A similar action is performed by closing to the side.

FIG. 2 shows a specific example of the adder circuit 28 in FIG.
r circuit diagram, 281 is a resistor, 282 is a capacitor, 285 is a transistor, 11 is a video signal output terminal,
12 is a resistor, 66 is an input terminal, and parts corresponding to those in Figure iA1 are given the same reference numerals. In Figure 2, resistors 281. Capacitor 282 and transistor 283 form adder circuit 28. The character signal input to the terminal 65 passes through a resistor 281 and a capacitor 282, and is then connected to a transistor 2 for adding character signals.
83 base.

This character signal is taken out from the emitter of transistor 283 and output to video camera 1 from terminal 61. In the video camera 1, a video signal outputted from the output terminal 11 is combined with the video signal, and a video signal with text information superimposed is sent from the input terminal 66 of the electronic viewfinder 6 to the electronic viewfinder.

〔Effect of the invention〕

As explained above, according to the present invention, since characters can be displayed superimposed on a video signal using the electronic viewfinder of a video camera, the characters to be superimposed can always be displayed even without a monitor receiver. This allows confirmation to be made, and the range of use of the character signal multiplex adapter can be greatly expanded compared to the conventional technology.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the character signal multiplexing adapter according to the present invention, Fig. 2 is a circuit diagram showing an integrated example of the adding circuit in Fig. 1, and Fig. 3 is a method of using the character signal multiplexing adapter. FIG. 1...Video camera/2...Character signal multiplex adapter 5...Video tape recorder 21...Operation panel 22...System control circuit 23...
Character pattern generation circuit 24...Character signal circuit 27.
...Choice switch 28... Addition circuit 11 L Zz Σ Direct'! Figure 3 -

Claims (1)

[Claims] A character signal multiplexing adapter connected between a video tape recorder and a video camera, which enables recording by superimposing a desired character signal on a video signal from the video camera when the video tape recorder is in a recording state. . A character signal multiplex adapter, comprising means for supplying the character signal to the video camera, and configured to be able to display characters based on the character signal on an electronic viewfinder of the video camera.