JPS63117729A - Living body electric phenomenon video monitor apparatus - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a bioelectrical phenomenon video monitor device that displays the dynamics of a subject and bioelectrical phenomena on the same screen.

[Summary of the invention]

The present invention provides a bioelectric phenomenon video monitor device that records an analog signal in the audio band of a video tape recorder, and when playing back, converts the reproduced analog signal into a video and combines it with the moving image of the subject captured by the camera, thereby producing a clear image. This allows you to get a nice analog screen.

[Conventional technology and problems]

Video monitoring devices that record the patient's dynamics and bioelectrical phenomena on the same videotape and play them back on the same screen are used in a variety of fields, such as diagnosing epileptic seizures, physical education, and considering treatment methods in dentistry. ing.

Conventionally, as shown in Figure 4, one video camera captures images of the subject and another video camera captures analog waveforms showing bioelectrical phenomena recorded on recording paper, and the two images are combined (for example, After placing the test subject on one half of the screen and the waveform on the other half, the videotape recorder (VTR)
I recorded it and played it back later. However, bioelectrical phenomena obtained with a video camera are not always clear, so it is possible to introduce a so-called memory scope using a memory element to visualize the analog signal, and then synthesize the obtained analog image with the dynamic image captured by the camera. devised (3rd
(see figure).

The spread of data processing in recent years has created a demand for data processing by reproducing recorded data, but in the conventional method described above, the data of bioelectrical phenomena is image information, so it is difficult to reproduce analog waveforms. difficult to do.

In order to make it possible to reproduce analog signals within the framework of the conventional method of recording on a VTR after video synthesis as described above, during recording, the subject is imaged with a video camera and recorded in the video band of the VTR, and the bioelectrical A part of the analog human power of the phenomenon is recorded on a data recorder, and when played back, the recorded data is visualized using the above-mentioned memory scope method and recorded on a VTR.
One possible method is to combine the video with the played video and display it on the monitor screen. However, with this method, it is difficult to synchronize the two videos, and it is necessary to take measures such as separating the synchronization signal from the VTR playback video signal and controlling the data recorder via a microcomputer (CPU). becomes expensive.

Therefore, a method as shown in FIG. 3 can be considered to simplify this synchronization means and obtain a reproduced analog signal. This method uses one synchronization signal generator to control a video camera and an analog human signal waveform imaging circuit using a common synchronization signal. In this case, the video camera will be used with external synchronization. The video captured by the camera and the visualized waveform video are combined by a video synthesis circuit and recorded in the video band of the VTR, and the analog human power performs PWM modulation and records in the audio band of the VTR. SWl and SW2 are interlocking switches, and are in position 1 during playback.
When recording, switch to position 2.

In this method, even if the composite video recorded on the VTR is clear, the composite image played back from the VTR is not clear. !
is inevitably degraded due to its frequency characteristics and is not clear. Therefore, the necessary clear waveform image cannot be obtained. Furthermore, with this method, editing of the composite screen is not possible during playback.

Therefore, the present invention records the subject's dynamics and bioelectrical phenomena on the same recording medium, and when playing back the waveform i! which requires relatively high image quality. The objective is to make the i-image clearer, obtain the necessary analog output, and enable editing of the composite screen.

[Means for solving problems]

The present invention modulates a bioelectric phenomenon analog human power signal as necessary and records it in the audio band of a VTR, and upon playback, obtains an analog output, visualizes the waveform, and combines it with the dynamic image of the subject to display it on the monitor screen. I made it so that it is displayed on the screen.

(Function) With the above configuration, an analog output is obtained during playback, making it possible to record and process the data.Also, since a waveform video signal is created from the analog output and the video is synthesized, the waveform according to the frequency characteristics of the VTR is generated. No image deterioration occurs,
A clear waveform image is displayed.

〔Example〕

FIG. 1 is a block diagram illustrating a preferred embodiment of the present invention.

During recording, the interlocking switches SW1 and SW2 are switched to position 2, and the video camera is used in internal synchronization to image the dynamic state of the subject. A portion of the video captured by the camera is recorded in the video band of the VTR. Analog human power of bioelectrical phenomena is
By appropriate modulation, such as PWM modulation, frequency components equivalent to audio are recorded in the audio band (low frequency) of the VTR.

At this time, the interlocking switches SW 1 and SW 2 are 2
, the dynamic images of the subject are simultaneously sent to the image synthesis circuit. On the other hand, a part of the analog input is converted into a video signal through A/D conversion by a waveform visualization circuit using the memory scope method, which is then combined with the patient's video in a video synthesis circuit and sent to a cathode ray tube monitor. It will be done. For example, the video synthesis circuit displays dynamic T! on the left half of the screen. i@! , waveform 'ii! on the right half! Both images are combined so that the images are shared.

During playback, the interlocking switches SWs and SW2 are switched to the 1 position. The dynamic video recorded in the video band of the VTR is
After playback, it is sent as is to the video synthesis circuit, but the analog signal (No. 6) recorded in the audio band of the VTR is converted to a video signal by the waveform visualization circuit via a PWM demodulator after playback, and then sent to the video synthesis circuit. .To combine both videos,
The synchronization signal used for the waveform visualization circuit and the synchronization signal of the camera that takes dynamic images must be the same.The technology of dividing the screen into two on the left and right, or on the top and bottom is well-known. In order to display a 9JJ image and a waveform image on the right, a common horizontal synchronizing signal may be used and both video signals may be switched in one cycle of the horizontal synchronizing signal, that is, in the middle of a horizontal scanning line. Therefore, in this embodiment, a synchronization signal is extracted from the reproduced video signal of the VTR via a synchronization separation circuit, and is supplied to the waveform imaging circuit. If it is desired to record the reproduced analog signal, it is sufficient to supply this analog signal to a suitable recorder before inputting it to the waveform imaging circuit.

In the video synthesis circuit, dynamic! In addition to having three screens and half a waveform screen, it is also possible to make the ratio of the left and right surfaces variable. In addition, the method is not limited to splitting the screen, and may also be a superimpose method in which two images are duplicated.The superimpose method has the disadvantage that the dynamic image is hidden when the waveform image becomes dense. However, in that case, there is no problem if you make it possible to erase one of the images.

FIG. 2 is a block diagram showing another embodiment of the invention. In the above-described embodiment, only dynamic images were recorded on the VTR, but in this embodiment, waveform images are also recorded on the VTR. Therefore, the output of the video synthesis circuit is not directly input to the video band of the VTR, but rather the output of the video synthesis circuit is input to the VTR. In this case, the waveform image is recreated and replaced with the recorded waveform image during playback, so no deterioration of the waveform image occurs. This has the advantage that the waveform video that is displayed can be played back on a general VTR playback device.

〔Effect of the invention〕

As explained above, according to the present invention, the following many effects can be obtained.

1) When simply recording composite video on a VTR as in the past, the high frequency components included in the waveform video signal are not reproduced due to the poor frequency characteristics of the VTR, so the quality of the waveform image on the playback screen deteriorates. In contrast, in the present invention, since the waveform image is always based on a signal obtained by visualizing the VTR reproduced analog output, the image quality is not degraded and is clear.

2) Analog data can be easily retrieved as needed, making data processing possible.

3) During playback, images can be synthesized arbitrarily. Furthermore, it is possible to change the proportion of the f)19 image on the screen according to the necessity, and to hide the waveform image in educational settings.

4) When recording a composite image, the dynamic image only occupies a part of the screen, but in the present invention, since it is recorded on the screen during recording, the storage capacity for the dynamic image is greatly increased. Become.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a first embodiment of the present invention, 'N
Figure 42 is a block diagram showing the second embodiment of the present invention;
The figure is a block diagram showing a comparative example for the present invention, fJIJ
FIG. 4 is a block diagram showing a conventional example. Since the names of the parts were written in the drawings without using symbols, the symbols will not be explained.

Claims (1)

[Claims] The dynamic image of the subject captured by the video camera is recorded in the video band of the video tape recorder, and an analog signal indicating the bioelectrical phenomenon of the subject is recorded in the audio band of the video tape recorder. The playback analog signal from the video tape recorder is converted into a video signal and inputted to the video synthesis means together with the playback video signal from the video tape recorder, and the output of the video synthesis means is supplied to a monitor to display the above-mentioned dynamic image on the same monitor screen. A bioelectrical phenomenon video monitor device capable of displaying images and the above-mentioned analog images.