CA985753A - Switchable frequency tone filter and detector with high speed switching capability - Google Patents
Switchable frequency tone filter and detector with high speed switching capabilityInfo
- Publication number
- CA985753A CA985753A CA183,297A CA183297A CA985753A CA 985753 A CA985753 A CA 985753A CA 183297 A CA183297 A CA 183297A CA 985753 A CA985753 A CA 985753A
- Authority
- CA
- Canada
- Prior art keywords
- detector
- high speed
- speed switching
- frequency tone
- switching capability
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/022—Selective call receivers
- H04W88/025—Selective call decoders
- H04W88/027—Selective call decoders using frequency address codes
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/04—Frequency selective two-port networks
- H03H11/12—Frequency selective two-port networks using amplifiers with feedback
- H03H11/1217—Frequency selective two-port networks using amplifiers with feedback using a plurality of operational amplifiers
- H03H11/1252—Two integrator-loop-filters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Networks Using Active Elements (AREA)
- Noise Elimination (AREA)
- Mobile Radio Communication Systems (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US00304440A US3803429A (en) | 1972-11-07 | 1972-11-07 | Switchable frequency tone filter and detector with high speed switching capability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA985753A true CA985753A (en) | 1976-03-16 |
Family
ID=23176520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA183,297A Expired CA985753A (en) | 1972-11-07 | 1973-10-12 | Switchable frequency tone filter and detector with high speed switching capability |
Country Status (12)
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50135962A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1974-04-16 | 1975-10-28 | ||
| US4019142A (en) * | 1974-08-16 | 1977-04-19 | Wycoff Keith H | Selectively callable receiver operated in accordance with tone characteristics |
| JPS5146235U (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1974-10-04 | 1976-04-05 | ||
| JPS587094B2 (ja) * | 1975-03-18 | 1983-02-08 | 日本電気株式会社 | ムセンコベツコシユツホウシキ |
| AT343213B (de) * | 1975-04-08 | 1978-05-10 | Funktechnisches Labor Ernst F | Schaltungsanordnung fur einen empfanger fur impulsfolgen |
| JPS5366309A (en) * | 1976-11-26 | 1978-06-13 | Nec Corp | Digital type tone signal detector |
| GB1562121A (en) * | 1976-11-26 | 1980-03-05 | Nippon Electric Co | Tone signal detecting circuits |
| US4145656A (en) * | 1977-04-27 | 1979-03-20 | Texas Instruments Incorporated | Transceiver capable of sensing a clear channel |
| US4419765A (en) * | 1979-10-12 | 1983-12-06 | Keith H. Wycoff | Signal absence detector |
| US4578533A (en) * | 1980-11-03 | 1986-03-25 | Universal Data Systems, Inc. | Switchable line powered modem |
| JPS57131991A (en) * | 1981-02-09 | 1982-08-16 | Matsushita Electric Ind Co Ltd | Gravitation type heat pipe |
| EP0142586A1 (en) * | 1983-11-17 | 1985-05-29 | Budapesti Radiotechnikai Gyar | A filter arrangement with active elements |
| US4659996A (en) * | 1984-02-27 | 1987-04-21 | Motorola, Inc. | Method and apparatus for de-ringing a switched capacitor filter |
| JPS61276695A (ja) * | 1985-05-31 | 1986-12-06 | Sumitomo Electric Ind Ltd | 複合パイプ、その製造方法及びそれを利用したヒ−トパイプ |
| EP0236579B1 (fr) * | 1986-03-11 | 1990-09-26 | Alcatel Bell-Sdt S.A. | Procédé de transmission de signaux à fréquences déterminées, notamment les signaux de teléimprimeur |
| GB2217539B (en) * | 1988-04-14 | 1992-09-23 | Plessey Co Plc | Prescaler output filter |
| DE3922977A1 (de) * | 1989-07-12 | 1991-01-24 | Texas Instruments Deutschland | Trimmschaltung und unter verwendung einer solchen trimmschaltung ausfuehrbares abgleichverfahren |
| US5142255A (en) * | 1990-05-07 | 1992-08-25 | The Texas A&M University System | Planar active endfire radiating elements and coplanar waveguide filters with wide electronic tuning bandwidth |
| DE4038291A1 (de) * | 1990-11-29 | 1992-06-04 | Funkwerk Koepenick Gmbh I A | Anordnung fuer die auswertung von selektivrufen |
| US8876512B2 (en) * | 2008-09-23 | 2014-11-04 | Cryovac, Inc. | Die for coextruding a plurality of fluid layers |
| US20100072655A1 (en) * | 2008-09-23 | 2010-03-25 | Cryovac, Inc. | Die, system, and method for coextruding a plurality of fluid layers |
| US8012572B2 (en) * | 2009-03-06 | 2011-09-06 | Cryovac, Inc. | Multilayer, heat-shrinkable film comprising a plurality of microlayers |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE708317C (de) * | 1939-01-17 | 1943-04-22 | Telefunken Gmbh | Anordnung zur Daempfung eines an einen Sender angeschlossenen Belastungskreises, insbesondere der Antenne eines Telegraphiesenders, in den Belastungspausen |
| CH294530A (de) * | 1951-10-04 | 1953-11-15 | Patelhold Patentverwertung | Verfahren und Einrichtung zum Senden von Impulssignalen mit Frequenztastung, insbesondere für drahtlose Telegraphie. |
| US3670242A (en) * | 1969-12-03 | 1972-06-13 | Lear Siegler Inc | A selective paging receiver and decoder employing an electronic filter means |
| FR2128019B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1970-04-08 | 1973-05-11 | Cit Alcatel |
-
1972
- 1972-11-07 US US00304440A patent/US3803429A/en not_active Expired - Lifetime
-
1973
- 1973-10-12 CA CA183,297A patent/CA985753A/en not_active Expired
- 1973-10-25 ZA ZA738270A patent/ZA738270B/xx unknown
- 1973-10-26 AU AU61856/73A patent/AU474076B2/en not_active Expired
- 1973-10-31 IL IL43528A patent/IL43528A/en unknown
- 1973-11-06 JP JP12487773A patent/JPS5330561B2/ja not_active Expired
- 1973-11-06 AR AR250879A patent/AR201118A1/es active
- 1973-11-07 FR FR7339611A patent/FR2205779B1/fr not_active Expired
- 1973-11-07 BR BR8706/73A patent/BR7308706D0/pt unknown
- 1973-11-07 DE DE2355700A patent/DE2355700C3/de not_active Expired
- 1973-11-07 GB GB5163573A patent/GB1412897A/en not_active Expired
-
1976
- 1976-10-14 HK HK651/76*UA patent/HK65176A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| GB1412897A (en) | 1975-11-05 |
| AU6185673A (en) | 1975-05-01 |
| DE2355700A1 (de) | 1974-05-22 |
| IL43528A0 (en) | 1974-06-30 |
| JPS5330561B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1978-08-28 |
| BR7308706D0 (pt) | 1974-08-22 |
| AU474076B2 (en) | 1976-07-15 |
| DE2355700B2 (de) | 1977-03-10 |
| AR201118A1 (es) | 1975-02-14 |
| US3803429A (en) | 1974-04-09 |
| HK65176A (en) | 1976-10-22 |
| DE2355700C3 (de) | 1986-01-09 |
| JPS4979653A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1974-08-01 |
| IL43528A (en) | 1976-05-31 |
| ZA738270B (en) | 1974-09-25 |
| FR2205779A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1974-05-31 |
| FR2205779B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1978-02-10 |
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