GB1182046A - Frequency Measuring Apparatus - Google Patents
Frequency Measuring ApparatusInfo
- Publication number
- GB1182046A GB1182046A GB5304068A GB5304068A GB1182046A GB 1182046 A GB1182046 A GB 1182046A GB 5304068 A GB5304068 A GB 5304068A GB 5304068 A GB5304068 A GB 5304068A GB 1182046 A GB1182046 A GB 1182046A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- voltage
- capacitor
- measured
- direct voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/0245—Detecting, measuring or recording pulse rate or heart rate by using sensing means generating electric signals, i.e. ECG signals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Cardiology (AREA)
- Heart & Thoracic Surgery (AREA)
- Molecular Biology (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Biomedical Technology (AREA)
- Signal Processing (AREA)
- Medical Informatics (AREA)
- Physiology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- General Physics & Mathematics (AREA)
- Electrotherapy Devices (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
1,182,046. Frequency measurement. AHREND-VAN GOGH N.V. 8 Nov., 1968 [10 Nov., 1967], No. 53040/68. Heading H3A. In a frequency measuring system, a capacitor 6 is charged by a constant current source 7, and is discharged by each impulse of a series to be measured, so that a sawtooth voltage occurs across the capacitor, of which the amplitude is proportional to the time interval between successive impulses, and from which a direct voltage is derived at 21 which is inversely proportional to the repetition frequency to be measured. A pulse generator 37, 38, Fig. 2, has its frequency modulated by this voltage, and its output is used to discharge a second capacitor 43 charged from a second constant current source 44 to produce a second sawtooth from which a direct voltage is derived which is inversely proportional to the frequency of the pulse generator, and which is thus directly proportional to the input frequency to be measured. In order to provide a smooth direct voltage at 21 from very low-frequency signals the voltage is smoothed by two capacitors 16, 17 alternately switched into circuit by a bi-stable 25 controlled from the input.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL6715252A NL6715252A (en) | 1967-11-10 | 1967-11-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1182046A true GB1182046A (en) | 1970-02-25 |
Family
ID=19801678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5304068A Expired GB1182046A (en) | 1967-11-10 | 1968-11-08 | Frequency Measuring Apparatus |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE1805564B2 (en) |
| FR (1) | FR1593147A (en) |
| GB (1) | GB1182046A (en) |
| NL (1) | NL6715252A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2368758A1 (en) * | 1976-10-19 | 1978-05-19 | Voron Politekhn Ins | Digital measurement of instantaneous values - uses time stress converter, hyperbola function generator, counter and display for slowly changing events |
-
1967
- 1967-11-10 NL NL6715252A patent/NL6715252A/xx unknown
-
1968
- 1968-10-26 DE DE19681805564 patent/DE1805564B2/en active Pending
- 1968-11-08 GB GB5304068A patent/GB1182046A/en not_active Expired
- 1968-11-08 FR FR1593147D patent/FR1593147A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL6715252A (en) | 1969-05-13 |
| DE1805564A1 (en) | 1970-02-19 |
| DE1805564B2 (en) | 1971-08-15 |
| FR1593147A (en) | 1970-05-25 |
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