JPS60207637A - Living body signal display apparatus - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a biosignal display device for displaying biosignals such as cardiogram signals and phonocardiogram signals.

(Naka) Prior Art A conventional biological signal display device of this type is shown in FIG. That is, in this biosignal display device 1a, the biosignal S output from the biosignal detection circuit 2 is A/D converted by the A/D converter 6 in accordance with the timing signal z1 provided from the timing signal generation circuit 4.

The digitized biological signal S is stored at a predetermined address position in the storage circuit 10a based on the address designation signal X from the write/read control circuit 8. The biological signal S stored here is the TV signal output from the TV synchronization signal generation circuit 12.
The signals are sequentially read out from the Atsys designated multiple XK synchronized with the synchronization signal and sent to the next-stage comparison circuit 14a. The comparison circuit 14a compares the quantization level of the input biosignal S with the count value Y of the counter 16 based on the TV synchronization signal output of the TV synchronization signal generation circuit 12, and transfers the display signal to the next stage when the two are equal. The signal is output to the boat/boat circuit 18. As a result, a bright spot signal is output from the one/yoat circuit 18, and a TV synchronization signal given from the TV synchronization signal generation circuit 12 is added to this bright spot signal by an adder 20, and the result is output to the TV monitor 22.

By the way, the biological signal S obtained by the biological signal detection circuit 2
is a relatively low frequency signal with one period of about 1 second. On the other hand, the storage capacity of the storage circuit 10a is set to about 500 bytes due to cost limitations and the like. Due to these factors, in the conventional device 1a, the timing signal z1 given from the timing signal generation circuit 4 to the A/D converter 6 is a low-frequency one that is combined with the biological signal S, and the sampling rate of the biological signal S is set using this signal. are doing. Therefore, if an attempt is made to store, for example, 10 seconds worth of biological signals S in the storage circuit 10a, the sampling rate of the biological signals S that are +++ A/D converted will be 15 to 30 milliseconds. In the R wave of an electrocardiogram, the cycle interval is usually about 0 milliseconds, so
When a biological signal is digitized at the sampling rate mentioned above, it becomes a discontinuous curve as shown in FIG. 4(a), which makes it difficult to see the scale and causes the signal to be captured. For this reason, the waveform is displayed differently depending on whether the biological signal is sampled at its peak position or not, resulting in problems such as insufficient reproducibility.

(c) Purpose The present invention aims to solve the above-mentioned conventional problems, to display biological signals as faithfully and continuously as possible in an easy-to-see manner, and to realize this at a low cost.

In order to achieve such an object, the present invention has an electrocardiogram signal,
a sampling signal generation circuit that provides a sampling signal having a frequency sufficiently larger than the frequency component of the biological signal to an A/D converter into which a biological signal such as a phonocardiogram signal is input; and the A/D converter. A detector that detects the maximum and minimum values of the quantization level included within a predetermined period of the biosignal digitized by the detector, and a memory that stores each signal of the maximum and minimum values detected by this detector. The circuit compares the quantization level of each signal of maximum value and minimum value read from this storage circuit with the count value corresponding to the TV scanning line, and the count value is determined as the maximum value and minimum value of each signal. and a comparison circuit that outputs a display signal when the quantization level is within the range of the quantization level, and the biological signal can be continuously displayed by interpolating between the maximum value and minimum value signals.

(e) Examples Hereinafter, the present invention will be explained in detail based on examples shown in the drawings.

FIG. 2 is a block diagram of the biological signal display device of this embodiment, and parts corresponding to those in FIG. 1 are given the same reference numerals. In the figure, 1b indicates a biological signal display device, 2 a biological signal detection circuit that outputs a biological signal S, such as an electrocardiogram signal ECa or a phonocardial signal, and 4 a timing signal z with a constant frequency.
A timing signal generation circuit 24 generates a timing signal Z from the timing signal generation circuit 4, and a sampling signal 24 outputs a sampling signal z2 having a sufficiently large frequency compared to the frequency component of the biological body No. 1g S in response to a timing signal Z from the timing signal generation circuit 4. This is a generation circuit. 6 generates a biological signal S in response to the sampling signal 22 given from the sampling signal generation circuit 24.
A/D converter for A/D converting, 26b, 26
Biosignal S digitized by A/D converter 6
Among them, maximum value and minimum value detectors 10b, IOC, which respectively detect the maximum value and minimum value of the quantization level included in the pulse period to of the timing signal Z1 output from the timing signal generation circuit 4; are each of the maximum value and minimum value stored in each biological Ig signal Saw and S button having the quantization level of the maximum value and minimum value detected by the maximum value and minimum value detector 26t) + 260, respectively. Storage circuit, 8 is each storage circuit 10t of maximum value and minimum value), maximum value to 100.

This is a write/read control circuit that controls writing and reading of each minimum value biological signal Sw, S@I+1. 12 is a TV synchronization signal generation circuit, 113 is a signal for detecting and counting the horizontal synchronization signal included in the TV synchronization signal output from the TV synchronization signal generation circuit 12, and 141) is the maximum value and minimum value. Each storage circuit 101), each maximum value and minimum value biosignal 5asx, Sm read from the IOC, respectively.
The quantization level of ++ is compared with the count value Y given from the counter 16, and when this count value Y is within the range of the quantization level of the maximum value and minimum value of each signal S and Smn, a display signal is generated. This is a comparison circuit that outputs . 18 is a one-shot circuit that inputs the display signal output from the comparator circuit 14b, and a bright spot signal output from the one-shot circuit 18 in response to the display signal and the TV synchronization signal generation circuit 12. An adder 22 adds the TV synchronization signal and a TV monitor.

In the biosignal display device 1b having the above configuration, the biosignal S output from the biosignal detection circuit 2 is sequentially A/D converted by the A/D converter 6 in accordance with the sampling signal z2 given from the sampling signal generation circuit 24. . In this case, the sampling signal z2 is the timing signal 2.2 output from the timing signal generation circuit 4, as shown in the third section. The frequency is higher than that. Therefore, the biological signal S is A/D converted at a sampling rate that is sufficiently higher than its frequency components. Biosignal 5il-i maximum value detector 261 digitized by A/D converter 6
) and the minimum value detector 26C. The maximum value and minimum value detectors 261) and 26C each measure the pulse period t of the timing signal Z1 given from the timing signal generation circuit 4. A signal Sm of the maximum value and minimum value of the quantization level from the biological signal S included in the biological signal S.

S win is detected, and the detected maximum value and minimum value biological signals Sm and F3wdrl are sent to the maximum value and minimum value storage circuits 10b and IOC at the next stage. And D [period t. The maximum value and minimum value of each biological signal Sy obtained for each
Smn is set to the maximum value and minimum value storage circuits 10t), 1 by the write address designation signal X from the write/read control circuit 8.
It is stored at a predetermined address location of 0C. in this way,
Biosignal 4 S Vi A/D conversion is performed at a sampling rate of a sufficiently large frequency compared to the frequency component, but the maximum value and minimum value storage circuits 101) are stored in the IOC at a relatively slow speed as before. The maximum value and minimum value of each biological signal S and S are stored.

Next, when data is read from each of the maximum value and minimum value storage circuits 10b and 10C, the TV synchronization signal output from the T-■ synchronization signal generation circuit 12 is applied to the successive write control circuit 8. The continuous write control circuit 8 generates a read address designation signal X in response to a horizontal synchronization signal included in the input TV synchronization signal.
is given to each of the maximum value and minimum value storage circuits 1ob and 1oc. As a result, the maximum value and minimum value biological signals SM and 5ill are read out in parallel from the storage circuit 101) and the IOC and sent to the next stage comparison circuit 141). The TV synchronization signal from the TV synchronization 1 word generation circuit 12 is sent to the counter 1.
6, the counter 16 counts the horizontal synchronizing signal included in this TV synchronizing signal and supplies the count value Y to the comparator circuit 12 as well. In other words, this count value Y corresponds to the TV scanning line. Comparison circuit 14b
is the maximum value and minimum value storage circuit 101), and compares the quantization level of the maximum value and minimum value of the biological signals Sag and Smn given from the IOC with the count value Y given from the counter 16, and calculates this count value. When Y is within the range of the maximum and minimum quantization levels of the biological signals Sm and Smn, a display signal is sequentially output in response to the output of the counter 16, and this signal is provided to the one-on-one circuit 18. The one-on-one circuit 18 outputs a bright spot signal every time the display signal is input from the comparator 14b, and supplies this to the adder 20.

j Since the TV synchronization signal 12 from the TV synchronization signal generation circuit 12 is inputted to the JII calculator 20 together with the bright spot signal from the one-shot circuit 18, both signals are added by the adder 20 and this is sent to the TV monitor 22. It can be output.

Therefore, each of the minimum and maximum values of the biological signals Sm addressed and read by the current read address designation signal X1
al, S When there is a duck, on the screen of the TV monitor 22, as shown in FIG. Interpolated data is displayed. Therefore, the finally displayed biological signal becomes a continuous curve.

(f) Effects As described above, according to the present invention, biological signals can be displayed faithfully and as continuous curves without having to acquire necessary data. This not only makes observation easy, but also provides good reproducibility and high reliability. Moreover, since it does not require a large storage capacity, it can be realized at low cost, which is an excellent effect.

[Brief explanation of the drawing]

FIG. 1 shows a conventional example, and FIGS. 2 to 4 show embodiments of the present invention. FIGS. 1 and 2 are block diagrams of a biological signal display device, and FIG. 3 is a waveform diagram. FIG. 4 is an explanatory diagram showing a comparison of biological signal display examples between a conventional product and a product according to the present invention. 1b...Biological signal display device, 6...A/D converter,
job, foe...maximum value, minimum value storage circuit, 14
+...Comparison circuit, 16...Counter, 24...Sampling signal generation circuit, 261)! 26c...Maximum value. The best detectors available. Head 8 Shimadzu Corporation

Claims (1)

[Claims] fl+ A sampling signal generation circuit that provides a summing signal having a frequency sufficiently larger than the frequency component of the biological signal to an A/D converter into which a biological signal such as an electrocardiogram signal or a phonocardiogram signal is input;
A detector that detects the maximum and minimum values of the quantization level included within a predetermined period of the biological signal digitized by the converter, and stores the maximum and minimum value signals detected by this detector. The quantization level of each signal of the maximum value and minimum value read from this storage circuit is compared with the count value corresponding to the TV scanning line, and this count value is determined as the maximum value and the minimum value. and a comparison circuit that outputs a display signal when the signal is within the quantization level range, and interpolates between the maximum value and minimum value of each signal so that biological signals can be continuously displayed. Characteristic biological signal display device.