JPH0136385Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a remote control circuit provided with a transmitting circuit that outputs a composite remote control signal.

BACKGROUND TECHNOLOGY In a portable video camera system in which a video camera is connected to a portable video tape recorder via a connection cable, the tape running mechanism in the video tape recorder can be put into a tape running state or a paused state by an operation on the video camera side. A remote control function that allows remote switching is essential. However, the remote control signals emitted from the video camera side often differ depending on the video camera system, and as with the shape of the connector used for the connection cable, it can be an obstacle when combining video cameras and video tape recorders between different systems. I was getting used to it.

There are two types of remote control circuits: level detection type and edge detection type, each having a circuit configuration shown in FIGS. 1A and 1B. 1st
The level detection type remote control circuit 1 shown in FIG.
A level detection type receiving circuit 3a is provided on the video tape recorder 3 side so that if the output terminal is at a high level, the tape is in a running state, and if the output terminal is at a low level, a pause state is obtained. . On the other hand, the edge detection type remote control circuit 4 shown in FIG. , an edge detection type receiving circuit 6a that detects a falling edge accompanying the closing of the remote switch 5a, which is output as a remote control signal.
is provided, and whenever a falling edge is detected,
The tape running state and the temporary stop state are sequentially switched and selected. Therefore, the waveforms of the remote control signals between the level detection type and the edge detection type are so different that it can be said that they are completely incompatible. 3, you will need a remote control signal conversion circuit or conversion adapter between the connection cable connector and the video tape recorder connection terminal, or you will need a remote control signal conversion circuit or conversion adapter on the video camera side. There were drawbacks such as the need to provide a switching circuit for switching signals.

DISCLOSURE OF THE INVENTION The present invention eliminates the above-mentioned drawbacks and is applicable to a level detection type receiving circuit that operates according to the signal level of a remote control signal, or to detect the rising or falling edge of a remote control signal. Without making any changes to the edge detection type receiving circuit that operates by detecting edges,
The purpose is to provide a remote control circuit that allows accurate information to be transmitted using a single connection cable.

To achieve this objective, the present invention provides a remote control circuit in which a transmitting circuit and a receiving circuit are connected via a connection cable, in which the transmitting circuit has a remote switch and an operation signal of the remote switch to invert the output state. an edge information pulse forming circuit that forms an edge information pulse that lasts for a predetermined time at a constant time interval from the rising or falling edge portion of the operation signal of the previous remote switch; and the edge information pulse forming circuit. The gist of the present invention is that it is composed of a synthesizing circuit that synthesizes the output of the flip-flop circuit and the output of the flip-flop circuit to form a composite remote control signal.

According to the present invention, the output of a flip-flop circuit whose output state is inverted each time a remote switch operates, and the output of an edge information pulse forming circuit that forms an edge information pulse each time a remote switch operates are combined to generate a composite remote control signal. and also for level detection type receiving circuits.
Alternatively, since the configuration is configured so that the same content of remote control information is supplied to the edge detection type receiving circuit through a single connection cable, a common transmitting circuit can be used regardless of the detection method of the receiving circuit. This eliminates the need for conversion circuits, conversion adapters, switching circuits, etc. that were conventionally required in order to make the transmitting circuits compatible, and provides excellent effects such as simplifying the overall circuit configuration.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to FIG. 2 and subsequent figures. Figure 2 is a circuit diagram showing one embodiment of the remote control circuit of the present invention;
Figures A to D are signal waveform diagrams of various parts of the remote control circuit shown in Figure 2, respectively.

In FIG. 2, the remote control circuit 11 is
A composite remote control signal is transmitted from the transmitting circuit 13 on the video camera 12 side, and is sent to the level detection type receiving circuit 3 to the video tape recorder 3 or 6.
In the case where the edge detection type receiving circuit 6a is provided, accurate operation of the receiving circuit 3a or 6a is similarly enabled.

The transmitting circuit 13 includes a T flip-flop circuit 13 connected in parallel to the remote switch 13a.
a NAND gate circuit 13 which takes as inputs b, edge information pulse forming circuit 13c, and the outputs of both circuits 13b and 13c, and essentially performs an AND operation on these circuits.
d and an inverter circuit 13e connected in series. In this embodiment, the edge information pulse forming circuit 13c has a structure in which monostable multivibrators with short holding times are connected in two stages, and when the remote switch 13a is closed, the signal input terminal is After being set to a low level, the first-stage monostable multivibrator operates with a delay for a time interval _r1 , and then the next-stage monostable multivibrator operates with a delay for a time interval _r2 . Therefore, the edge information pulse forming circuit 1
3c, each time the remote switch 13a is closed, when a time interval _r1 has elapsed from the time of closing,
The edge information pulse shown in FIG. 3C which lasts for a time interval r ₂ will be output.

On the other hand, the output level of the Q output terminal of the T flip-flop circuit 13b is inverted each time its trigger input terminal is set to low level. Therefore, the output signal waveform of the T flip-flop circuit 13b becomes as shown in FIG. 3B.

These edge information pulse forming circuits 13
The output of c and the output of the T flip-flop circuit 13b are connected to the NAND gate circuit 13d and the inverter circuit 1.
3e, the edge information pulse suitable for the edge detection type receiving circuit 6a and the level information pulse suitable for the level detection type receiving circuit 3a are generated as shown in FIG. 3D. Combined into a composite remote control signal.

Therefore, the video tape recorder 3 having a level detection type receiving circuit 3a for the video camera 12
is connected, the tape will run when the composite remote control signal is at high level, and vice versa when it is at low level.
Tape running is temporarily stopped. Note that the low level interval corresponding to time interval _r2 in the composite remote control signal is set to a very short time interval so as not to affect the tape transport mechanism, but even if the tape transport mode is momentarily stopped, It is even better if measures are taken on the video tape recorder 3 side to prevent the transition to this mode.

Furthermore, when a video tape recorder 6 having an edge detection type receiving circuit 6a is connected to the video camera 12, the remote switch 1
Immediately after closing 3a, an edge information pulse is supplied to the receiving circuit 6a. Therefore, the edge detection type receiving circuit 6a can detect edge information every time the remote switch 13a is closed, thereby enabling accurate remote control of the video tape recorder 6. Note that the video tape recorder 6 can alternately repeat a tape running state and a tape stop state in response to edge information pulses.

As explained above, according to the remote control circuit 11 having the above configuration, the output of the T flip-flop circuit 13b whose output state is inverted each time the remote switch 13a operates, and the edge information pulse are formed each time the remote switch 13a operates. The outputs of the edge information pulse forming circuit 13c are combined to create a composite remote control signal, and a single connection cable is used for both the level detection type receiving circuit 3a and the edge detection type receiving circuit 6a. Since the configuration is configured such that the same content of remote control information is supplied, the common transmitting circuit 13 can be used regardless of the detection method of the receiving circuits 3a and 6a. The necessary conversion circuit, conversion adapter, switching circuit, etc. are not required, and the overall circuit configuration can be simplified.

[Brief explanation of the drawing]

1A and 1B are circuit diagrams showing examples of conventional level detection type and edge detection type remote control circuits, respectively; FIG. 2 is a circuit diagram showing an embodiment of the remote control circuit of the present invention; 3A to 3D are signal waveform diagrams of various parts of the remote control circuit shown in FIG. 2, respectively. 11...Remote control circuit, 13...
Transmission circuit, 13a...Remote switch, 13b
...T flip-flop circuit, 13c... edge information pulse forming circuit, 13f... synthesis circuit.

Claims (1)

[Scope of utility model registration request] In a remote control circuit in which a transmitting circuit and a receiving circuit are connected via a connection cable, the transmitting circuit includes a remote switch, a flip-flop circuit that inverts an output state according to an operating signal of the remote switch, and a flip-flop circuit that inverts an output state according to an operating signal of the remote switch. an edge information pulse forming circuit that forms an edge information pulse that lasts for a predetermined time at regular time intervals from the rising or falling edge portion of the edge information, and an output of the edge information pulse forming circuit and the output of the flip-flop circuit are synthesized , and a synthesis circuit that forms a composite remote control signal.