SU740230A1 - Digital cardiotachometer - Google Patents

Description

(54) DIGITAL PULSOTOMOMETER

The invention relates to the field of medical measurement technology and can be used in devices for measuring pulse rate. Known digital .. pulsator / containing datlik, pulse signal generator, the input of which is connected to the sensor, reference frequency generator, counter, digital indicator and reset signal generator, outputs of which are connected to the reset inputs of the counter and digital indicator, and output of the counter connected With digital indicator 1, -However, the known device has a complex circuit. The aim of the invention is to simplify the circuit when measuring the instantaneous and average values of the pulse rate. For this, two frequency dividers with the same conversion factor, a decoder and a controlled frequency divider are introduced, the input of the first frequency splitter is connected to the output of the pulse generator and the output of the reset signal generator, the second splitter input the frequency is connected to the output of the reference frequency generator, and the output is connected to the signal input of the controlled frequency divider, the control input of which is connected via a decoder to the output of the counter, and the output of the frequency divider to be connected is connected to the signal input y counter. FIG. 1 is a block diagram of a digital heart rate monitor; FIG. 2 is a time diagram of its operation. The digital heart rate monitor consists of a sensor 1 of the pulse generator 2 pulse signals, the input of which is connected to the sensor, a generator 3 of the reference frequency, a counter 4, a digital indicator 5. and a former of 6 reset signals, the output 1 of which is connected to the fault inputs, a counter 4 and a digital indicator 5, and the output of the counter .4 is connected to a digital indicator 5, two dividers 7 and 8 frequencies with the same conversion factor, the decoder 9. and a controlled frequency divider 10, the input of the first frequency divider 7 is connected to the output of the imager 2 signal s pulsation, and the output - to the input of the reset signal shaper 6, the input of the second frequency divider 8 connected to the output of the reference frequency generator 3, and the output - the signal input of a controllable divider 10 hour

then: gee, which is also connected to the output of the decoder of the 9th ingress counter 4y and the counter eaixbiibi connected on by the inputs of the decoder 9.

In the assumption of a digital pulsot-Scef-ieTpe a piece of juicy linear approximation of the dependence of the frequency on the pulse period is made. Lohman 12 reflects the dependence of the value of the inverse code S of the counter 4 on the pulse Neriod. The number of breakpoints at 12 depends on the required accuracy of the test and the limits of measurement of the pulse of the achometer,

The operation of a digital pulse meter is considered with a division factor of 7 and 8 frequency, equal to the medical unit, which corresponds to an instantaneous measurement; heart rate,

The signals 13 of the pulse from the sensor 1 is fed to the input of the imaging unit 2 pulse signals. With the release of the formyryat-. l 2 signals 14 are received through a frequency divider 7 on shaper 6 signals 15 and 1b с6р6ёа :, ббг-Рбрае come on a digital display) 5 and on counter 4. Signal 15, coming on digital indicator 5, precedes signal 16, which goes on counter 4. When the signal-15 in the digital indicator 5 arrives, the recorded information of the glS is reset and the current value of the number presented in the form of the return code is reset. 4. After that, the signal 4 receives the signal 16, which resets it to its original state. condition. ,

The frequency division factor of the frequency divider control 10 is determined by the signals from the decoding signal .9. In the initial state of the counter 4, the decoder 9 controls the operation of the controlled divider 10 frequency in such a way / that at its output the highest frequency of the signals of the 17 counting pulses is received. 4. After a certain period, the time determined by the specified precision of the piecewise linear approximation, the number of pulses in the counter 4 reaches the value at which the decoder 9 performs Switching the controlled frequency divider Yu and the input of the counter 4 receives signals 17 with a lower frequency - RP 4, Similarly, the frequency of signals 17 from the output of controlled frequency divider 10 decreases depending on the number of pulses received at counter 4, the capacity of counter 4, the division factors of controlled frequency divider 10 and the number of pulses in the counter at which the change occurs output signals of the decoder 9, calculated in such a way that the value of the numbers presented by the counter code of the counter 4 with a given accuracy corresponds to the pulse frequency for the measured period T ..

In order to get the averaged values of the frequency nyrtbca, the coefficient of trans. counting the dividers 7 and 8 frequencies with the same division factor is set: they pitch in more. At the same time, the frequency of the signals at the input Q of the driver of the reset signals and the frequency of the signals at the input of the controlled frequency divider 10 decreases.

The digital digital pulsothometer allows you to simplify the circuit from-. instantaneous and average pulse rate values 5, exclude precision elements and sources of reference voltages. In connection with the simplification of the circuit and the predominant use of digital microcircuits, the amount of tuning work is reduced and

the timing of periodic calibration increases. In this connection, the simplification of the scheme is achieved by about 20%. While maintaining the accuracy characteristics of the 5 known bullets of the cell of the achometer, the proposed device makes it possible. reduce its size and power consumption due to large integration and microwatt consumption. n digital chips MOS technology, as well as improve its reliability.

Claims (1)

The invention includes a digital heart rate monitor, which contains a sensor, a pulse shaper5 lOv pulse whose input is connected to a sensor, a reference frequency generator, a counter, a digital indicator and a shaper of reset signals, the outputs of which are connected to the fault inputs of a counter and digital indicator, and the output of the counter is connected to a digital indicator, which is tl icch a y and y. so that, in order to simplify cxeMJ when measuring instantaneous and. mean values of the pulse rate, two frequency dividers with the same conversion factor, a decoder and a controlled frequency divider are entered into it, and the input of the first frequency divider is divine with the output of the pulse signal conditioning unit, - the output - with the input of the reset signalization generator, the input the second frequency divider is connected. with the output of the generator-reference frequency, and the output - with the signal input.  MLC of controlled frequency divider, the control input of which is connected via a decoder to the counter input, the output of the controlled frequency divider is connected to the Signal input 0 counter. Sources of information taken into account in the examination 1, USSR inventor certificate 464304,, cl. A 61 B, 5/02, 1975 5 (prototype),: