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GB2134752B - Tone generator - Google Patents

Tone generator

Info

Publication number
GB2134752B
GB2134752B GB08400858A GB8400858A GB2134752B GB 2134752 B GB2134752 B GB 2134752B GB 08400858 A GB08400858 A GB 08400858A GB 8400858 A GB8400858 A GB 8400858A GB 2134752 B GB2134752 B GB 2134752B
Authority
GB
United Kingdom
Prior art keywords
tone generator
tone
generator
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
GB08400858A
Other versions
GB8400858D0 (en
GB2134752A (en
Inventor
Paul Allan
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.)
GE Healthcare UK Ltd
Plessey Co Ltd
Original Assignee
GE Healthcare UK Ltd
Plessey Co 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
Priority claimed from GB838301324A external-priority patent/GB8301324D0/en
Application filed by GE Healthcare UK Ltd, Plessey Co Ltd filed Critical GE Healthcare UK Ltd
Priority to GB08400858A priority Critical patent/GB2134752B/en
Publication of GB8400858D0 publication Critical patent/GB8400858D0/en
Publication of GB2134752A publication Critical patent/GB2134752A/en
Application granted granted Critical
Publication of GB2134752B publication Critical patent/GB2134752B/en
Expired 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
    • H04Q1/4575—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 which are transmitted in digital form

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)
GB08400858A 1983-01-18 1984-01-13 Tone generator Expired GB2134752B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08400858A GB2134752B (en) 1983-01-18 1984-01-13 Tone generator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB838301324A GB8301324D0 (en) 1983-01-18 1983-01-18 Tone generator
GB08400858A GB2134752B (en) 1983-01-18 1984-01-13 Tone generator

Publications (3)

Publication Number Publication Date
GB8400858D0 GB8400858D0 (en) 1984-02-15
GB2134752A GB2134752A (en) 1984-08-15
GB2134752B true GB2134752B (en) 1986-08-06

Family

ID=26284943

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08400858A Expired GB2134752B (en) 1983-01-18 1984-01-13 Tone generator

Country Status (1)

Country Link
GB (1) GB2134752B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2570899B1 (en) * 1984-09-26 1986-12-05 Jeumont Schneider GENERATOR OF A PLURALITY OF DIFFERENT FREQUENCY SIGNALS AND TRANSMITTER INCLUDING SUCH A GENERATOR
US5127004A (en) * 1989-09-15 1992-06-30 Rockwell International Corporation Tone and announcement message code generator for a telephonic switching system and method
GB2287377B (en) * 1991-06-12 1995-12-13 Mitel Corp Digitally controlled ringer signal generation
GB2308248B (en) * 1995-12-12 1998-02-11 Holtek Microelectronics Inc Waveform-generating apparatus
GB2317063B (en) * 1996-09-03 1999-03-03 Holtek Microelectronics Inc An adjustable-period dual-tone multifrequency generator

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH542554A (en) * 1972-03-30 1973-09-30 Ibm Method for the transmission of audible signals and call signals in a time division multiplex communication system
US4205203A (en) * 1978-08-08 1980-05-27 Wescom Switching, Inc. Methods and apparatus for digitally signaling sounds and tones in a PCM multiplex system
CA1124898A (en) * 1979-03-01 1982-06-01 Ernst A. Munter Pcm tone signal generator
GB2103039A (en) * 1981-07-23 1983-02-09 Int Standard Electric Corp Electronic tone generator

Also Published As

Publication number Publication date
GB8400858D0 (en) 1984-02-15
GB2134752A (en) 1984-08-15

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 20040112