DE3028120A1 - Body function frequency measuring appts. esp. for breathing rate - determines quotient of measured to reference count values using programmable memory and binary counters - Google Patents

Abstract

The circuit is for measuring the frequency of a periodic signal and is esp. applicable to bodily functions such as breathing. The conventional method of counting breaths over a period of half to one minute is automated simply. The number of pulses derived from a signal corresp. to the function is fed to a programmable memory with a number of reference pulses. The quotient of the measured reference pulse counts is digitally determined. The derived and reference pulses are fed to binary counters whose output values are fed as addresses to the programmable memory or memories at defined times. The transfer times are determined by a decoder. At these times the count values are first input to intermediate memories and converted into addresses before transfer to the programmable memories.

Description

- 10 - VPA 80 P 5957 EN Possible commercially available integrated modules

Binary counter: MC 14024
Decoder: CD 4002
Temporary memory: SN 74LS 174 Programmable memory: HM-7621

130067 / 028Ö

Claims (8)

- JT - VPA 80 P 5957 DE patent claims - * \ 1./Method for determining the frequency of a periodic ■■■ - Signal, in particular a body function such as breathing, characterized in that electrical pulses are derived from the signal, the number of which together with the number of reference pulses at least one programmable memory (9, 10) are supplied for the digital determination of the quotient from the number of derived reference pulses. 2. The method according to claim 1, characterized that the derived as well as the reference pulses are sent to a binary counter (3, 4) are given whose output values at certain times as addresses to the programmable memory (s) (9-i .10). 3. The method according to claim 2, characterized that the specific times are predetermined by a decoder (8) and the counter values first get to the buffer (5, 6), from v / o they are used as addresses for the programmable one or more Memory (s) (9, 10) are supplied. 4. The method according to any one of claims 1 to 3, d a through characterized in that the output signal of the programmable memory (s) (9, 10) is used to control a recorder. 5. The method according to any one of claims 1 to 3, d a through characterized in that the output signal of the programmable memory (s) (9, 10) used to control a numeric display will. 1300B7 / 028Ö -JS- VPA 80 P 5957 DE 6. The method according to any one of claims 1 to 5, d a through marked that for each decimal place of the frequency value to be determined one programmable memory (9, 10) is provided. 7. The method according to any one of claims 1 to 5, d a characterized in that for each two decimal places of the frequency value to be determined a programmable memory (9, 10) is provided. 8. Circuit arrangement for performing the method according to one of claims 1 to 7, characterized that a first binary counter (3) is provided, at whose input the reference pulses are applied, that a second binary counter (4) is provided is, at the input of which the derived pulses are placed, that the outputs of the first counter (3) with the parallel inputs of the first buffer (5) and the outputs of the second counter (A) with the parallel The inputs of the second buffer (6) are connected to the input and the outputs of the second counter (4) are also connected to such a decoder (7, 8) that the transfer of the counter output values takes place after a certain number of derived pulses and that the outputs of the two Intermediate memory (5, 6) are connected to the address inputs of at least one programmable memory (9, 10). 130067/0280