SE7413681L - - Google Patents
Info
- Publication number
- SE7413681L SE7413681L SE7413681A SE7413681A SE7413681L SE 7413681 L SE7413681 L SE 7413681L SE 7413681 A SE7413681 A SE 7413681A SE 7413681 A SE7413681 A SE 7413681A SE 7413681 L SE7413681 L SE 7413681L
- Authority
- SE
- Sweden
- Prior art keywords
- circuit
- frequency
- input signal
- signal
- oscillator
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D1/00—Demodulation of amplitude-modulated oscillations
- H03D1/22—Homodyne or synchrodyne circuits
- H03D1/2272—Homodyne or synchrodyne circuits using FET's
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
1484253 Frequency detectors G W GURRY and B F MCCARTHY 30 Oct 1974 [31 Oct 1973] 50666/73 Heading H3A A circuit for detecting when an input signal lies within a predetermined frequency range and has an amplitude exceeding a predetermined value comprises sampling circuits 3, 5 to which the input signal is supplied and which are also fed with sampling signals #2A, #2B, #3A, #3B, from a voltage controlled oscillator circuit 1, the control signal for the oscillator being derived from the sampling circuit 3. This circuit samples the input signal about its zero crossings to provide an output proportional to frequency. As long as the frequency of the input signal lies within the range determined by high and low limit signals fed to oscillator VCO the signal derived from sampler 3 will lock the oscillator circuit to the frequency of the incoming signal. Sampling signals #3A, #3B are phase displaced from #2A, #2B and sampler 5 produces an output dependent on amplitude. When this amplitude exceeds a predetermined value, a signal is produced at the OUTPUT terminal of the circuit.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5066673A GB1484253A (en) | 1973-10-31 | 1973-10-31 | Electrical circuit means for detecting the frequency of input signals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SE7413681L true SE7413681L (en) | 1975-05-02 |
| SE404088B SE404088B (en) | 1978-09-18 |
Family
ID=10456865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE7413681A SE404088B (en) | 1973-10-31 | 1974-10-30 | ELECTRICAL CIRCUIT DEVICE FOR DETECTING AN INSIGNAL OF A FREQUENCY WITHIN A PRESED SPECIFIED RATE |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS5836541B2 (en) |
| AT (1) | AT363518B (en) |
| CA (1) | CA1008139A (en) |
| DE (1) | DE2451571A1 (en) |
| FR (1) | FR2250228B1 (en) |
| GB (1) | GB1484253A (en) |
| IT (1) | IT1021969B (en) |
| NL (1) | NL7414232A (en) |
| SE (1) | SE404088B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1044144B (en) * | 1975-07-30 | 1980-03-20 | Selenia Ind Elettroniche | IMPROVEMENT IN DEVICES FOR DETERMINING POINT ERRORS, PARTICULARLY IN RADAR SYSTEMS |
| US4127824A (en) * | 1977-04-04 | 1978-11-28 | Motorola, Inc. | Sampling filter-detector |
| DE3040380C2 (en) * | 1980-10-25 | 1983-11-17 | Felten & Guilleaume Fernmeldeanlagen GmbH, 8500 Nürnberg | Arrangement for frequency detection |
| JPH0246346U (en) * | 1988-09-22 | 1990-03-29 | ||
| CN113608021B (en) * | 2021-07-23 | 2022-05-20 | 华中科技大学 | Chaotic oscillator circuit and weak signal detection system based on chaos theory |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1094302A (en) * | 1964-03-12 | 1967-12-06 | Plessey Uk Ltd | Improvements in or relating to frequency sensing systems |
| CA946922A (en) * | 1971-04-19 | 1974-05-07 | Wavetek | Frequency detector |
-
1973
- 1973-10-31 GB GB5066673A patent/GB1484253A/en not_active Expired
-
1974
- 1974-10-28 IT IT5377874A patent/IT1021969B/en active
- 1974-10-30 CA CA212,673A patent/CA1008139A/en not_active Expired
- 1974-10-30 DE DE19742451571 patent/DE2451571A1/en not_active Ceased
- 1974-10-30 SE SE7413681A patent/SE404088B/en not_active IP Right Cessation
- 1974-10-31 JP JP49124989A patent/JPS5836541B2/en not_active Expired
- 1974-10-31 FR FR7436531A patent/FR2250228B1/fr not_active Expired
- 1974-10-31 AT AT0880374A patent/AT363518B/en not_active IP Right Cessation
- 1974-10-31 NL NL7414232A patent/NL7414232A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5080707A (en) | 1975-07-01 |
| IT1021969B (en) | 1978-02-20 |
| AT363518B (en) | 1981-08-10 |
| NL7414232A (en) | 1975-05-02 |
| CA1008139A (en) | 1977-04-05 |
| FR2250228A1 (en) | 1975-05-30 |
| SE404088B (en) | 1978-09-18 |
| DE2451571A1 (en) | 1975-06-05 |
| GB1484253A (en) | 1977-09-01 |
| FR2250228B1 (en) | 1978-06-16 |
| JPS5836541B2 (en) | 1983-08-10 |
| ATA880374A (en) | 1981-01-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| NUG | Patent has lapsed |
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