GB1412897A - Switchable frequency tone filter and detector with high speed switching capability - Google Patents

Switchable frequency tone filter and detector with high speed switching capability

Info

Publication number
GB1412897A
GB1412897A GB5163573A GB5163573A GB1412897A GB 1412897 A GB1412897 A GB 1412897A GB 5163573 A GB5163573 A GB 5163573A GB 5163573 A GB5163573 A GB 5163573A GB 1412897 A GB1412897 A GB 1412897A
Authority
GB
United Kingdom
Prior art keywords
filter
frequency
bandwidth
capacitor
tones
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
Application number
GB5163573A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Motorola Solutions Inc
Original Assignee
Motorola Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Motorola Inc filed Critical Motorola Inc
Publication of GB1412897A publication Critical patent/GB1412897A/en
Expired legal-status Critical Current

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)
GB5163573A 1972-11-07 1973-11-07 Switchable frequency tone filter and detector with high speed switching capability Expired GB1412897A (en)

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
GB1412897A true GB1412897A (en) 1975-11-05

Family

ID=23176520

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5163573A Expired GB1412897A (en) 1972-11-07 1973-11-07 Switchable frequency tone filter and detector with high speed switching capability

Country Status (12)

Country Link
US (1) US3803429A (enExample)
JP (1) JPS5330561B2 (enExample)
AR (1) AR201118A1 (enExample)
AU (1) AU474076B2 (enExample)
BR (1) BR7308706D0 (enExample)
CA (1) CA985753A (enExample)
DE (1) DE2355700C3 (enExample)
FR (1) FR2205779B1 (enExample)
GB (1) GB1412897A (enExample)
HK (1) HK65176A (enExample)
IL (1) IL43528A (enExample)
ZA (1) ZA738270B (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2217539A (en) * 1988-04-14 1989-10-25 Plessey Co Plc Switchable response filter

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50135962A (enExample) * 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 (enExample) * 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
GB1562121A (en) * 1976-11-26 1980-03-05 Nippon Electric Co Tone signal detecting circuits
JPS5366309A (en) * 1976-11-26 1978-06-13 Nec Corp Digital type tone signal detector
US4147984A (en) * 1977-04-27 1979-04-03 Texas Instruments Incorporated Dual digital processor transceiver
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
DE3674580D1 (de) * 1986-03-11 1990-10-31 Acec Verfahren zum uebertragen von signalen bestimmter frequenz, insbesondere fernschreibsignalen.
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
US20100072655A1 (en) * 2008-09-23 2010-03-25 Cryovac, Inc. Die, system, and method for coextruding a plurality of fluid layers
US8876512B2 (en) * 2008-09-23 2014-11-04 Cryovac, Inc. Die 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)

* Cited by examiner, † Cited by third party
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 (enExample) * 1970-04-08 1973-05-11 Cit Alcatel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2217539A (en) * 1988-04-14 1989-10-25 Plessey Co Plc Switchable response filter
GB2217539B (en) * 1988-04-14 1992-09-23 Plessey Co Plc Prescaler output filter

Also Published As

Publication number Publication date
JPS5330561B2 (enExample) 1978-08-28
AU6185673A (en) 1975-05-01
IL43528A (en) 1976-05-31
JPS4979653A (enExample) 1974-08-01
HK65176A (en) 1976-10-22
DE2355700B2 (de) 1977-03-10
IL43528A0 (en) 1974-06-30
AU474076B2 (en) 1976-07-15
ZA738270B (en) 1974-09-25
DE2355700A1 (de) 1974-05-22
CA985753A (en) 1976-03-16
DE2355700C3 (de) 1986-01-09
US3803429A (en) 1974-04-09
FR2205779A1 (enExample) 1974-05-31
BR7308706D0 (pt) 1974-08-22
AR201118A1 (es) 1975-02-14
FR2205779B1 (enExample) 1978-02-10

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PE20 Patent expired after termination of 20 years

Effective date: 19931106