GB2276260B - A tone detector - Google Patents

A tone detector

Info

Publication number
GB2276260B
GB2276260B GB9305845A GB9305845A GB2276260B GB 2276260 B GB2276260 B GB 2276260B GB 9305845 A GB9305845 A GB 9305845A GB 9305845 A GB9305845 A GB 9305845A GB 2276260 B GB2276260 B GB 2276260B
Authority
GB
United Kingdom
Prior art keywords
tone detector
tone
detector
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 - Fee Related
Application number
GB9305845A
Other versions
GB2276260A (en
GB9305845D0 (en
Inventor
Patrick Ian Conduit
Trevor Pullen
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 UK Ltd
Original Assignee
Motorola Ltd
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 Ltd filed Critical Motorola Ltd
Priority to GB9305845A priority Critical patent/GB2276260B/en
Publication of GB9305845D0 publication Critical patent/GB9305845D0/en
Priority to DE19944406483 priority patent/DE4406483A1/en
Publication of GB2276260A publication Critical patent/GB2276260A/en
Application granted granted Critical
Publication of GB2276260B publication Critical patent/GB2276260B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
GB9305845A 1993-03-20 1993-03-20 A tone detector Expired - Fee Related GB2276260B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB9305845A GB2276260B (en) 1993-03-20 1993-03-20 A tone detector
DE19944406483 DE4406483A1 (en) 1993-03-20 1994-02-28 Sound detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9305845A GB2276260B (en) 1993-03-20 1993-03-20 A tone detector

Publications (3)

Publication Number Publication Date
GB9305845D0 GB9305845D0 (en) 1993-05-05
GB2276260A GB2276260A (en) 1994-09-21
GB2276260B true GB2276260B (en) 1996-04-17

Family

ID=10732473

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9305845A Expired - Fee Related GB2276260B (en) 1993-03-20 1993-03-20 A tone detector

Country Status (2)

Country Link
DE (1) DE4406483A1 (en)
GB (1) GB2276260B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19506544C2 (en) * 1995-02-24 2001-07-12 Siemens Ag Method and circuit arrangement for detecting analog audio signals with a predetermined frequency

Also Published As

Publication number Publication date
GB2276260A (en) 1994-09-21
GB9305845D0 (en) 1993-05-05
DE4406483A1 (en) 1994-09-22

Similar Documents

Publication Publication Date Title
GB2288586B (en) A palletiser
GB9306248D0 (en) A handsafe arrangement
AU122157S (en) A cassette
GB9408578D0 (en) A detector
AU119102S (en) A cassette
GB2281139B (en) A detector
AU119371S (en) A cassette
GB2282260B (en) A Piezo-Resonator
DE69312281D1 (en) A/d wandler
GB2306657B (en) A detector
GB9400105D0 (en) A body-harness
AU119418S (en) A brief
GB9319582D0 (en) A flame detector
GB2276260B (en) A tone detector
GB9312194D0 (en) A velociped
GB2264127B (en) A bombardment-inhibiting facing
GB2263971B (en) A downlighter
AU119066S (en) A drumstick
AU124737S (en) A detector
GB9314451D0 (en) A proximity detector
AU119340S (en) A guitar
AU118527S (en) A tea-towel
GB9303762D0 (en) A duckboard
LTIP1671A (en) A tricycl
HRP931411B1 (en) A transpeduncular corrector - stabilizer

Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19990320