GB1053389A - - Google Patents
Info
- Publication number
- GB1053389A GB1053389A GB1053389DA GB1053389A GB 1053389 A GB1053389 A GB 1053389A GB 1053389D A GB1053389D A GB 1053389DA GB 1053389 A GB1053389 A GB 1053389A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- frequency
- signals
- heterodyned
- tracting
- 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.)
- Active
Links
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/4802—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage by using electronic circuits in general
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- 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
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Frequencies, Analyzing Spectra (AREA)
Abstract
1,053,389. Frequency discriminators. AGA A.B. Dec. 31, 1963 [Jan. 25, 1963]. No. 51319/63. Heading H3A. A method of determining the frequency of a signal comprises deriving a phase quadrature signal from the signal, differentiating the two signals, multiplying in modulators each signal by the differential of the other and finally sub- - tracting the modulation products to produce a voltage proportional to the frequency of the signal. The signal whose frequency is to be measured may be used directly, Fig. 1 (not shown), or alternatively it may be heterodyned with a standard frequency and the measurement made on the beat frequency, Fig. 2 (not shown). For low frequency signals, the signal and quadrature signal are modulated on to a carrier frequency, Fig. 3 (not shown).
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1053389A true GB1053389A (en) |
Family
ID=1757528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1053389D Active GB1053389A (en) |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1053389A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3582781A (en) * | 1969-06-27 | 1971-06-01 | Sony Corp | Velocity detecting apparatus employing a pair of modulation-type magnetic heads on which carriers are phase modulated by flux from a moving magnetic scale |
| FR2506023A1 (en) * | 1981-05-15 | 1982-11-19 | Snecma | OBJECT DISPLACEMENT SENSOR AND DEVICE BY APPLYING TO MEASURE ROTATION SPEED AND ROTOR VIBRATION FREQUENCIES, IN PARTICULAR A TURBOMACHINE WHEEL |
| US4369405A (en) * | 1979-07-10 | 1983-01-18 | Nippondenso Co., Ltd. | Rotational position detecting apparatus |
| GB2143386A (en) * | 1983-07-14 | 1985-02-06 | Standard Telephones Cables Ltd | Radio receiver |
-
0
- GB GB1053389D patent/GB1053389A/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3582781A (en) * | 1969-06-27 | 1971-06-01 | Sony Corp | Velocity detecting apparatus employing a pair of modulation-type magnetic heads on which carriers are phase modulated by flux from a moving magnetic scale |
| US4369405A (en) * | 1979-07-10 | 1983-01-18 | Nippondenso Co., Ltd. | Rotational position detecting apparatus |
| FR2506023A1 (en) * | 1981-05-15 | 1982-11-19 | Snecma | OBJECT DISPLACEMENT SENSOR AND DEVICE BY APPLYING TO MEASURE ROTATION SPEED AND ROTOR VIBRATION FREQUENCIES, IN PARTICULAR A TURBOMACHINE WHEEL |
| EP0065458A1 (en) * | 1981-05-15 | 1982-11-24 | Societe Nationale D'etude Et De Construction De Moteurs D'aviation, "S.N.E.C.M.A." | Capacitive detector for the displacement of objects |
| US4482859A (en) * | 1981-05-15 | 1984-11-13 | S.N.E.C.M.A. | Object displacement sensor and device for measuring the rotation speed and vibration frequency of a rotor |
| GB2143386A (en) * | 1983-07-14 | 1985-02-06 | Standard Telephones Cables Ltd | Radio receiver |
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