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GB1436472A - Shock falsing inhibitor circuit for a plural tone receiver - Google Patents

Shock falsing inhibitor circuit for a plural tone receiver

Info

Publication number
GB1436472A
GB1436472A GB614474A GB614474A GB1436472A GB 1436472 A GB1436472 A GB 1436472A GB 614474 A GB614474 A GB 614474A GB 614474 A GB614474 A GB 614474A GB 1436472 A GB1436472 A GB 1436472A
Authority
GB
United Kingdom
Prior art keywords
tone
transistor
receiver
gate
inhibitor
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
GB614474A
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 GB1436472A publication Critical patent/GB1436472A/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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
    • G08B3/1008—Personal calling arrangements or devices, i.e. paging systems
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
    • G08B3/1008—Personal calling arrangements or devices, i.e. paging systems
    • G08B3/1016—Personal calling arrangements or devices, i.e. paging systems using wireless transmission

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Amplifiers (AREA)
  • Electronic Switches (AREA)
  • Manipulation Of Pulses (AREA)
  • Noise Elimination (AREA)

Abstract

1436472 Receivers MOTOROLA Inc 11 Feb 1974 [1 March 1973] 06144/74 Headings H3T and H4L [Also in Division G4] A receiver designed to respond to the sequential application of at least two tones A, B comprises means for suppressing an output therefrom if tone B is received within a predetermined time after reception of tone A. Thus substantially simultaneous detection of tones due to shocking, jarring or other external influence on the receiver is ignored, and the receiver may safely use reed filters. Reception of tone A by filter 14 gives rise to a negative pulse which is differentiated at 31; if tone B is detected while 31 is still providing a negative poutput, then gate 32 is enabled. Latch 33 then operates to keep gate 32 open for the duration of the output from filter 15, while the output from gate 32 operates an inhibitor 21. In the embodiment of Fig. 3 the outputs from 14, 15 are applied to terminals 35, 51, the signal at 35 being differentiated at 36 to turn transistor 37 off. If a signal is applied to 51 while 37 is off, then transistor 50 is turned on, transistor tor 37 is clamped off and transistor 55 is turned on. The voltage at terminal 56 is then applied to inhibitor 21.
GB614474A 1973-03-01 1974-02-11 Shock falsing inhibitor circuit for a plural tone receiver Expired GB1436472A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00337057A US3806938A (en) 1973-03-01 1973-03-01 Shock falsing inhibitor circuit for a plural tone receiver

Publications (1)

Publication Number Publication Date
GB1436472A true GB1436472A (en) 1976-05-19

Family

ID=23318933

Family Applications (1)

Application Number Title Priority Date Filing Date
GB614474A Expired GB1436472A (en) 1973-03-01 1974-02-11 Shock falsing inhibitor circuit for a plural tone receiver

Country Status (10)

Country Link
US (1) US3806938A (en)
JP (1) JPS502804A (en)
AR (1) AR199607A1 (en)
AU (1) AU461470B2 (en)
BR (1) BR7401396D0 (en)
CA (1) CA981342A (en)
FR (1) FR2220077A1 (en)
GB (1) GB1436472A (en)
IL (1) IL44285A (en)
ZA (1) ZA741253B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4019142A (en) * 1974-08-16 1977-04-19 Wycoff Keith H Selectively callable receiver operated in accordance with tone characteristics
US4769610A (en) * 1987-06-29 1988-09-06 Motorola, Inc. Tone decoder

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3465294A (en) * 1966-03-07 1969-09-02 Motorola Inc Plural channel frequency detecting circuit

Also Published As

Publication number Publication date
ZA741253B (en) 1975-02-26
FR2220077A1 (en) 1974-09-27
BR7401396D0 (en) 1974-11-05
AU461470B2 (en) 1975-05-29
JPS502804A (en) 1975-01-13
IL44285A0 (en) 1974-05-16
US3806938A (en) 1974-04-23
AR199607A1 (en) 1974-09-13
DE2409974A1 (en) 1974-09-26
CA981342A (en) 1976-01-06
IL44285A (en) 1976-07-30
AU6611174A (en) 1975-05-29
DE2409974B2 (en) 1977-04-14

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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