SU741853A1 - Pulse width-to-pulse frequency converter - Google Patents

Description

one

The invention relates to medical, engineering, and is intended for use in devices for measuring and monitoring heart rate.

Known pulse converter

duration in pulse frequency, containing a pulse sensor and a counting circuit jlj

However, the known device has considerable dimensions and the inaccurate accuracy of heart rate measurement.

The aim of the invention is to improve the accuracy of pulse rate measurement and simplify the design. J5

For A timer, a generator and pulses and a divider are inserted into the device, the pulse sensor output is connected to the time relay input and the divider setup input, the time relay output is connected to the pulse generator input, the output of which is connected to the counting input of the divider, and the divider is connected to the input of the counting circuit.

The drawing shows a block diagram of a pulse duration converter, to pulse frequency.

Pulse duration to pulse frequency converter contains 1 pulse relay, time relay 2, 3 pulse generator, divider 4, counting circuit 5. Divider 4 consists, for example, of pulse duration counter 6 and divider counter 7. Pulse sensor output 1 is connected to a setup input the divider 4 and the relay 2 time input, the time relay 2 code is connected to the input of the generator 3 pulses, the output of which is connected to the counting input of de-glitter 4, and the output of the divider 4- connected to the input of the counting circuit 5.

The Converter pulse duration in pulse frequency operates as follows. The pulse duration from the pulse sensor 1, in the form of an impulse bundle (f 1 kfU), is fed to the setting input of the Divider 4, where it is stored. At the end of the pack starts

relay 2 times, controlling the generator of 3 pulses, whose frequency is $ 2 6 MHz, pulse duration imp. Therefore, from the generator 3 pulses to the input of the divider 4 will pass a pack of 60,000 pulses. The stability requirements of the relay 2 times and the generator of 4 pulses are rather insignificant, for example, at frequencies X2 5.9 - 6.1 mHz, the pulse value is measured with an accuracy of ± 1 beats. (to increase the accuracy, for example, to + 0.1 beats, you need to change the frequencies f and, respectively, f kHz and fl 60 mHz, etc.). The pulses from the generator 3 pulses in the divider are divided by the pulse duration, and the quotient is recorded in the counting circuit 5 (for example, when the pulse duration time is 0.25 s, the setting of the divider 4 in the pulse pulse counter 6 will contain the number 250, and in this way, 60OOOO will be divided in the counter-divider 7 by 250, from the code of the divider 4 to the counting circuit 5, 24O pulses will pass, which corresponds to 240 beats / min).

The proposed converter provides high accuracy of pulse frequency measurement.

Claims (1)

1. USSR author's certificate No. 470771, kp A 61 B 5/02, 1974 (prototype).