JPH038766B2 - - Google Patents

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 useful in a variety of fields, including the diagnosis of epileptic seizures, physical education, and examination of treatment methods in dentistry. It is used.

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, The test subject was placed on one half of the screen, the waveform was placed on the other half, etc.) and then recorded on a video tape recorder (VTR) and played back later. However, the 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 combine the obtained analog image with the dynamic image captured by the camera. was devised (see Figure 3).

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. It becomes difficult to do so.

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 One possible method is to temporarily record the analog input of the phenomenon on a data recorder, and when playing back, convert the recorded data into a video using the above-mentioned memory scope method, combine it with the video played back from the VTR, 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 a waveform video circuit for an analog input signal 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.
The analog input is PWM modulated and recorded in the audio band of the VTR. SW ₁ and SW ₂ are interlocking switches, which are set to position 1 during playback and to position 2 during recording. In this method, even though the composite image recorded on the VTR is clear, the composite image played back from the VTR is inevitably degraded and not clear due to its frequency characteristics. 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 reproduced, the waveform image, which requires relatively high image quality, becomes clear and the necessary analog output can be obtained. , and to enable editing of the composite screen.

[Means for solving problems]

The present invention modulates a bioelectric phenomenon analog input 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.

[Effect]

With the above configuration, an analog output is obtained during playback, so it is 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 deterioration of the waveform image due to the frequency characteristics of the VTR is avoided. A clear waveform image is displayed.

〔Example〕

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

When recording, switch interlock switches SW ₁ and SW ₂ to position 2, use the video camera in internal synchronization,
Capture images of the subject's movements. A portion of the footage captured by the camera is recorded in the video band of the VTR. Analog inputs of bioelectrical phenomena can be modified with suitable modulation e.g. PWM
VTR converts frequency components equivalent to audio through modulation
Record in the audio band (low frequency). At this time,
Since the interlocking switches SW ₁ and SW ₂ are in position 2, dynamic images of the subject are simultaneously sent to the image synthesis circuit. On the other hand, some of the analog inputs are converted to A/V by a waveform visualization circuit using the memory scope method.
The signal is converted into a video signal through D conversion, combined with the patient's video in a video synthesis circuit, and sent to a cathode ray tube monitor. The video synthesis circuit synthesizes both images so that, for example, the left half of the screen is a dynamic image and the right half is a waveform image.

During playback, interlock switches SW ₁ and SW ₂ are switched to position 1. The dynamic video recorded in the video band of the VTR is sent as is to the video synthesis circuit after playback, but the analog signal recorded in the audio band of the VTR is converted into a video signal by the waveform visualization circuit after playback via the PWM demodulator. After being converted, it is sent to the video synthesis circuit. In order to synthesize both images, the synchronization signal used for the waveform imaging circuit and the synchronization signal of the camera that obtains the dynamic image must be the same. The technology of dividing the screen into two left and right or top and bottom is well known. For example, to display a dynamic image on the left and a waveform image on the right, a common horizontal synchronization signal is used to display both video signals. Switching may be performed during 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, not only can the dynamic screen be divided into half and the waveform screen be divided, but also the left and right screen ratio can be made variable. Furthermore, the method is not limited to dividing the screen, but may also be a superimposition method in which two images are overlapped. The superimpose method has the disadvantage that the dynamic image is hidden when the waveform image becomes dense, but in that case, there is no problem if one of the images can be erased.

FIG. 2 is a block diagram showing another embodiment of the invention. In the above example, only dynamic images are displayed.
Although it was recorded on a VTR, this example also includes waveform video.
It was designed to be recorded on a VCR. Therefore, the output of the camera is not directly input into the video band of the VTR, but the output of the video synthesis circuit is input into the VTR. Also in this case, since the waveform image is recreated and replaced with the recorded waveform image during playback, no deterioration of the waveform image occurs. This example has the advantage that waveform video recorded on a tape can be played back with a general VTR playback device, if there is no problem even if the image quality of the waveform screen is degraded.

〔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 our invention, the waveform image is always
Since it is based on a video signal of the VTR playback analog output, there is no deterioration in image quality and it is clear.

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

3. During playback, the image composition can be edited as desired. It becomes possible to change the proportion of the dynamic image on the screen according to its importance, or to hide the waveform image in educational settings.

4. When recording a composite video, the dynamic video only occupies a part of the screen, but in the present invention, the dynamic video is recorded to fill the entire screen, so the storage capacity for the dynamic video is greatly increased.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention, FIG. 2 is a block diagram showing a second embodiment of the present invention, FIG. 3 is a block diagram showing a comparative example to the present invention, and FIG. The figure is a block diagram showing a conventional example. Since I wrote the part names on the drawing without using symbols,
The symbols will not be explained.

Claims (1)

[Scope of Claims] 1. A dynamic video signal of the subject is recorded by a video camera in the video band of a video tape recorder, and an analog signal indicating bioelectrical phenomena of the subject is recorded in the audio band of the video tape recorder. In the bioelectrical phenomenon video monitoring device configured to record, a first switch means to which a playback output signal recorded by the video tape recorder is supplied and a recording output signal of the video camera is directly supplied; , a second switching means interlocked with the first switching means, which is supplied with a playback output signal recorded in the audio band by the video tape recorder and directly supplied with an analog recording output signal of the bioelectrical phenomenon;
a waveform visualization means that is supplied with the output signal of the second switch means and converts the analog signal indicative of the bioelectrical phenomenon into a video signal; the first switch means and the waveform visualization means. an image synthesizing means for synthesizing both video signals obtained by visualizing the dynamic image signal of the subject and the analog signal indicating the bioelectrical phenomenon; A bioelectric phenomenon video monitor device, characterized in that it is capable of supplying a monitor with a clear reproduction output signal and displaying it.