JPS59214388A - Interface system between medical electronic equipment and multiformat camera - Google Patents

Abstract

PURPOSE:To transmit a video signal and a shutter control signal to a camera side while they are insulated effectively from each other by multiplexing the shutter control signal in the video signal, and supplying the signals from an electronic equipment to the camera through an insulating means. CONSTITUTION:A signal Vs formed by superposing the shutter control signal upon the video signal is sent out of the electronic equipment side 10 through an amplifier A and an insulating transformer T. This signal Vs is so generated that the shutter control signal SC to which a DC bias is added is superposed upon CW of some frequency (e.g. about 0.3-2NMz) in the horizontal blanking period HD of the head part Fo of a filed. The camera side detects the shutter control signal from the signal input through a filter, etc., and photography is started when a TV video signal inputted following said signal has some contents.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a medical electronic diagnostic device and a video communication system (in this specification, these are referred to as TV video) and displayed on a CR7 screen. The present invention relates to a signal interface method with a so-called multi-format camera that can capture images of perilla on film.

Conventionally, there has been a phenomenon in which the ground current of the multi-format camera flows into the medical diagnostic equipment side through the signal lines that pass the TV video signal and shutter control signal sent to the multi-format camera, which is a serious problem in terms of safety measures. That's a problem.

When digital equipment is used in a place where noise is likely to enter, a method of insulating the entire (or part) of the interface wire between the equipment with a photocoupler has been tried for a long time. Additionally, there are some devices, such as electrocardiogram premeters, for which a wireless system is a good insulation means. Furthermore, when the signal does not include a DC component and is limited in level and band, it can also be referred to as transformer coupling. or,
C-coupling and ultrasonic coupling are particularly effective when modulated using a high frequency as a carrier. Furthermore, optical coupling is also used as a good insulation means.

Now, the insulation of TV video signals, which is the focus of this application, is
Surprisingly, it is known that transformer coupling using a broadband transformer is sufficient. Transformer coupling is often used between a TV station and a transmitting station, or even within a station, to remove common mode noise, direct current, extremely low frequency, or commercial frequency interference between two points several hundred meters apart.

By the way, since the shutter control signal of a multi-format camera is normally supplied from the medical electronic device side, it is necessary to provide insulation to this signal as well.

However, although it is effective to isolate the 1V bij'A signal and the control signal separately, it has the disadvantage that it is not very economical because it only increases the number of circuits for isolation.

The present invention has been made in view of this point, and its () purpose is to provide an interface that can effectively isolate the TV video signal and the camera control and transmit it to the multi-format camera side. The method is to provide covering.

The present invention achieves this objective by providing multi-format 1 to camera formats for TV video signals. The present invention is characterized in that the tuft control signals are multiplexed and the signals are supplied from the medical electronic device to the multi-format camera via an insulating means.

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. Shutter control is added to the TV video signal. [The signal VS, which is a multiplexed call signal, passes through amplifier A and then is further connected to isolation transformer 1.
It is sent from the medical electronic device side 10 via. The output signal is transmitted to the multi-format camera 20 via a 75Ω coaxial cable CΔ or the like. The multiplexed signal Vs
has a configuration as shown in Figure 2. That is, T'V
In the video signal, the frequency (for example, 0°3 to
2M+-12PI! The shutter control signal 1 to the roll signal SC obtained by adding a DC bias to the CW of the trace) are superimposed.

With this type of signal input, the multi-format camera uses a filter etc. to detect the shutter control signal from this signal, and if there is content in the subsequently input TV video signal, it will start displaying. Configure it.

Another method is to maintain the synchronization of the deflection system by always outputting only the synchronization signal (while the screen is completely black), and only during the period when shooting is required, the screen content appears much brighter than when the screen is completely black. This is the way to do it. The multi-format camera side is configured to detect the arrival of a video signal with a significantly brighter part than all black and trigger an internal monostable multi-byte break or the like.

Note that signal isolation on the device main body side is not limited to the wideband video transformer as described above, but it is also possible to use isolation means using a F-A1-coupler or RF modulation method.
The insulation stage may be installed on the multi-format camera side instead of on the device main body side.

Alternatively, the signal structure may be such that the audio channel of the TV video signal is used as a shutter control signal of a multi-format camera.

As explained above, according to the present invention, the shutter control signal of a multi-format camera can be multiplexed into a TV video signal, and the shutter control signal can be sent by effectively utilizing the TV video signal Q isolated transmission.
It is possible to realize a transverse signal interface system.

[Brief explanation of the drawing]

Figure 1 shows 1! for carrying out the method of the present invention. ! Fig. 2 is an explanatory diagram of the configuration of the T-video A signal employed in the present invention. 10...Medical electronic device

Claims (4)

[Claims] (1) A medical electronic device characterized in that a shutter control signal for a multi-format camera is multiplexed into a TV video signal, and the signal is supplied from the medical electronic device to the multi-format camera via an insulating means. Interface method with multi-format cameras. (2) The insulating means includes a broadband video transformer;
An interface method between a medical electronic device and a Marboeuf A-mat camera according to claim 1, characterized in that it uses one of a photocoupler and a high frequency modulation method. (3) An interface between a medical electronic device and a multi-format camera according to claim 2, wherein the insulating means is disposed on at least one of the medical electronic device side and the multi-format camera side. 1-s method. (4) Substitute the shutter control signal with a video signal that has a significantly brighter part than the black of the -1■ video signal, and only when this signal arrives and is IC, the multi-format camera determines that the switch control signal has arrived and takes a picture. An interface system between a medical electronic device and a multi-format camera according to claim 1, characterized in that the interface system is configured to initiate a multi-format camera.