GB1450081A - Detecting or processing electrical signals - Google Patents
Detecting or processing electrical signalsInfo
- Publication number
- GB1450081A GB1450081A GB4429273A GB4429273A GB1450081A GB 1450081 A GB1450081 A GB 1450081A GB 4429273 A GB4429273 A GB 4429273A GB 4429273 A GB4429273 A GB 4429273A GB 1450081 A GB1450081 A GB 1450081A
- Authority
- GB
- United Kingdom
- Prior art keywords
- data signal
- 12msec
- period
- spurious
- amplifier
- 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
- 239000003990 capacitor Substances 0.000 abstract 2
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 230000007774 longterm Effects 0.000 abstract 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/30—Input circuits therefor
- A61B5/307—Input circuits therefor specially adapted for particular uses
- A61B5/308—Input circuits therefor specially adapted for particular uses for electrocardiography [ECG]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R17/00—Measuring arrangements involving comparison with a reference value, e.g. bridge
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/30—Input circuits therefor
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/38—DC amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers
- H03F3/387—DC amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers with semiconductor devices only
- H03F3/393—DC amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers with semiconductor devices only with field-effect devices
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
- H03G3/345—Muting during a short period of time when noise pulses are detected, i.e. blanking
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
- A61B5/7217—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal of noise originating from a therapeutic or surgical apparatus, e.g. from a pacemaker
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7235—Details of waveform analysis
- A61B5/7239—Details of waveform analysis using differentiation including higher order derivatives
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Molecular Biology (AREA)
- General Health & Medical Sciences (AREA)
- Pathology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Veterinary Medicine (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- Biophysics (AREA)
- Public Health (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Cardiology (AREA)
- Electrotherapy Devices (AREA)
- Noise Elimination (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Abstract
1450081 - Removing spurious pulses SIEMENS AG 20 Sept 1973 [20 Sept 1972] 44292/73 Headings G1N and G1U Spurious pulses are removed from a data signal, e.g. an ECG waveform, by an arrangement which, having detected the presence of a spurious pulse by the fact that its leading edge is sufficiently steep, effectively then zeroises the waveform for a pre-set period, e.g., 12msec., and then at the end of the pre-set period allows the waveform to return to its proper level smoothly, rather than abruptly, thereby both preventing the formation of secondary high frequency noise and reducing any long term transients resulting from the original spurious pulse. As shown in Fig. 2, an ECG waveform normally passes direct from a terminal 1, via an amplifier 19, to ultilisation devices 10, 11. The beginning of a spurious pulse with a sufficiently steep leading edge is detected by a differentiator 12, 13, rectifier 14 and threshold circuit 15, to set a 12msec monostable 16 on. This causes an FET 22 to conduct thereby applying 100% negative feedback to the amplifier 19 so that the data signal is zeroized. At the end of the 12msec period, FET 22 returns to its normal non-conductive state and the data signal is reapplied to the line 2. However, no abrupt change occurs because the amplitude of the data signal at the end of the 12msec period will be stored on a capacitor 24 and will be applied, via amplifier 19, in opposition to the data signal. Thus, the signal on line 2, which was zero during the 12msec reject period, gradually rises, as capacitor 24 discharges, to the valve of the data signal.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2246100A DE2246100C3 (en) | 1972-09-20 | 1972-09-20 | Device for acquiring or processing useful measurement signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1450081A true GB1450081A (en) | 1976-09-22 |
Family
ID=5856829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4429273A Expired GB1450081A (en) | 1972-09-20 | 1973-09-20 | Detecting or processing electrical signals |
Country Status (5)
| Country | Link |
|---|---|
| DE (1) | DE2246100C3 (en) |
| FR (1) | FR2200526B1 (en) |
| GB (1) | GB1450081A (en) |
| NL (1) | NL7312380A (en) |
| SE (1) | SE395772B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USRE31158E (en) | 1976-06-23 | 1983-02-22 | National Research Development Corporation | Apparatus for indicating uterine activity in labor |
| CN114224302A (en) * | 2021-12-22 | 2022-03-25 | 上海贝瑞电子科技有限公司 | Multi-physiological-parameter signal single-channel synchronous acquisition device |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4305400A (en) * | 1979-10-15 | 1981-12-15 | Squibb Vitatek Inc. | Respiration monitoring method and apparatus including cardio-vascular artifact detection |
| US4331157A (en) * | 1980-07-09 | 1982-05-25 | Stimtech, Inc. | Mutually noninterfering transcutaneous nerve stimulation and patient monitoring |
| DE3818455A1 (en) * | 1988-05-31 | 1989-12-14 | Philips Patentverwaltung | Peak voltage meter |
-
1972
- 1972-09-20 DE DE2246100A patent/DE2246100C3/en not_active Expired
-
1973
- 1973-09-07 NL NL7312380A patent/NL7312380A/xx not_active Application Discontinuation
- 1973-09-18 SE SE7312702A patent/SE395772B/en unknown
- 1973-09-19 FR FR7333579A patent/FR2200526B1/fr not_active Expired
- 1973-09-20 GB GB4429273A patent/GB1450081A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USRE31158E (en) | 1976-06-23 | 1983-02-22 | National Research Development Corporation | Apparatus for indicating uterine activity in labor |
| CN114224302A (en) * | 2021-12-22 | 2022-03-25 | 上海贝瑞电子科技有限公司 | Multi-physiological-parameter signal single-channel synchronous acquisition device |
| CN114224302B (en) * | 2021-12-22 | 2024-03-15 | 上海贝瑞电子科技有限公司 | Multi-physiological parameter signal single-channel synchronous acquisition device |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2246100A1 (en) | 1974-03-28 |
| NL7312380A (en) | 1974-03-22 |
| DE2246100C3 (en) | 1979-06-07 |
| DE2246100B2 (en) | 1978-10-12 |
| SE395772B (en) | 1977-08-22 |
| FR2200526B1 (en) | 1979-04-27 |
| FR2200526A1 (en) | 1974-04-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |