GB1423565A - Device for determining in a signal the presence of a given frequency - Google Patents
Device for determining in a signal the presence of a given frequencyInfo
- Publication number
- GB1423565A GB1423565A GB1699073A GB1699073A GB1423565A GB 1423565 A GB1423565 A GB 1423565A GB 1699073 A GB1699073 A GB 1699073A GB 1699073 A GB1699073 A GB 1699073A GB 1423565 A GB1423565 A GB 1423565A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- rate
- logic
- frequencies
- circuit
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
- H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
- H03D3/04—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by counting or integrating cycles of oscillations
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measuring Frequencies, Analyzing Spectra (AREA)
- Manipulation Of Pulses (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7212651A FR2179536B1 (US07968547-20110628-C00004.png) | 1972-04-11 | 1972-04-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1423565A true GB1423565A (en) | 1976-02-04 |
Family
ID=9096666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1699073A Expired GB1423565A (en) | 1972-04-11 | 1973-04-09 | Device for determining in a signal the presence of a given frequency |
Country Status (11)
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2241930B1 (US07968547-20110628-C00004.png) * | 1973-08-23 | 1976-06-18 | Alsthom Cgee | |
| US4021653A (en) * | 1975-10-14 | 1977-05-03 | Motorola, Inc. | Digital programmable tone detector |
| NL170797C (nl) * | 1975-11-18 | 1982-12-16 | Nederlanden Staat | Inrichting voor het detecteren van een signaal. |
| US4181967A (en) * | 1978-07-18 | 1980-01-01 | Motorola, Inc. | Digital apparatus approximating multiplication of analog signal by sine wave signal and method |
| US4504786A (en) * | 1982-06-14 | 1985-03-12 | Slaughter Grimes G | Signal detector |
| US4707653A (en) * | 1985-10-17 | 1987-11-17 | Ampex Corporation | Frequency measurement circuit |
| FR2685990A1 (fr) * | 1992-01-02 | 1993-07-09 | Sgs Thomson Microelectronics | Detecteur de verrouillage d'une boucle a verrouillage de phase. |
| GB2346292B (en) * | 1999-01-30 | 2003-06-11 | Motorola Ltd | Voltage standing-wave ratio measurement apparatus and use in a cellular communications system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1638582C3 (de) * | 1967-06-20 | 1973-11-15 | Siemens Ag, 1000 Berlin U. 8000 Muenchen | Schaltungsanordnung zum Erzeugen eines Signales bei zwischen zwei Wechselspannungen auftretenden Frequenz unterschieden |
-
1972
- 1972-04-11 FR FR7212651A patent/FR2179536B1/fr not_active Expired
-
1973
- 1973-04-09 US US00349525A patent/US3820021A/en not_active Expired - Lifetime
- 1973-04-09 GB GB1699073A patent/GB1423565A/en not_active Expired
- 1973-04-10 SE SE7305049A patent/SE385620B/xx unknown
- 1973-04-11 CH CH525473A patent/CH573122A5/xx not_active IP Right Cessation
- 1973-04-11 ZA ZA732507A patent/ZA732507B/xx unknown
- 1973-04-11 BE BE129886A patent/BE798065A/xx not_active IP Right Cessation
- 1973-04-11 ES ES413585A patent/ES413585A1/es not_active Expired
- 1973-04-11 CA CA168,461A patent/CA977033A/en not_active Expired
- 1973-04-11 IT IT22879/73A patent/IT982756B/it active
- 1973-04-11 NL NL7305090A patent/NL7305090A/xx not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| IT982756B (it) | 1974-10-21 |
| CH573122A5 (US07968547-20110628-C00004.png) | 1976-02-27 |
| ZA732507B (en) | 1974-02-27 |
| DE2318026B2 (de) | 1976-04-01 |
| FR2179536A1 (US07968547-20110628-C00004.png) | 1973-11-23 |
| BE798065A (fr) | 1973-10-11 |
| CA977033A (en) | 1975-10-28 |
| SE385620B (sv) | 1976-07-12 |
| DE2318026A1 (de) | 1973-10-31 |
| ES413585A1 (es) | 1976-01-16 |
| US3820021A (en) | 1974-06-25 |
| FR2179536B1 (US07968547-20110628-C00004.png) | 1975-03-21 |
| NL7305090A (US07968547-20110628-C00004.png) | 1973-10-15 |
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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 |