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SE8004570L - Tonmottagare - Google Patents

Tonmottagare

Info

Publication number
SE8004570L
SE8004570L SE8004570A SE8004570A SE8004570L SE 8004570 L SE8004570 L SE 8004570L SE 8004570 A SE8004570 A SE 8004570A SE 8004570 A SE8004570 A SE 8004570A SE 8004570 L SE8004570 L SE 8004570L
Authority
SE
Sweden
Prior art keywords
pcm
interval
samples
received
tone
Prior art date
Application number
SE8004570A
Other languages
Unknown language ( )
English (en)
Other versions
SE447946B (sv
Inventor
I F Arend
J S Locke
Original Assignee
Northern Telecom 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 Northern Telecom Ltd filed Critical Northern Telecom Ltd
Publication of SE8004570L publication Critical patent/SE8004570L/sv
Publication of SE447946B publication Critical patent/SE447946B/sv

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
    • H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
    • H04Q1/448—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency with conversion of a single frequency signal into a digital signal
    • H04Q1/4485—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency with conversion of a single frequency signal into a digital signal which is transmitted in digital form

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
SE8004570A 1979-07-02 1980-06-19 Mottagare och sett for indikering av nervaron av en forutbestemd pulskodmodulerad tonsignal SE447946B (sv)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/053,826 US4277650A (en) 1979-07-02 1979-07-02 Single frequency tone receiver

Publications (2)

Publication Number Publication Date
SE8004570L true SE8004570L (sv) 1981-01-03
SE447946B SE447946B (sv) 1986-12-22

Family

ID=21986798

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8004570A SE447946B (sv) 1979-07-02 1980-06-19 Mottagare och sett for indikering av nervaron av en forutbestemd pulskodmodulerad tonsignal

Country Status (3)

Country Link
US (1) US4277650A (sv)
CA (1) CA1120622A (sv)
SE (1) SE447946B (sv)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4403298A (en) * 1981-06-15 1983-09-06 Bell Telephone Laboratories, Incorporated Adaptive techniques for automatic frequency determination and measurement
US4438504A (en) 1981-06-15 1984-03-20 Bell Telephone Laboratories, Incorporated Adaptive techniques for automatic frequency determination and measurement
IL64230A0 (en) * 1981-11-06 1982-02-28 Israel Electronics Corp Tone detector
US4528664A (en) * 1982-11-29 1985-07-09 Northern Telecom Limited Call progress signal monitor and method for telephone systems
JPS605658A (ja) * 1983-06-07 1985-01-12 Hashimoto Corp 秘書電話方式
US4726057A (en) * 1986-07-28 1988-02-16 AT&T Information Systems Inc. American Telephone & Telegraph Company Answer detection method and apparatus for coin telephone sets
US4908825A (en) * 1988-04-08 1990-03-13 Northern Telecom Limited Memory organization and output sequencer for a signal processor
US20060222106A1 (en) * 2005-04-04 2006-10-05 Seidman James L Method for detecting single frequency tones

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3863030A (en) * 1972-06-01 1975-01-28 Gte Automatic Electric Lab Inc Pcm tone receiver using digital spectrum analysis

Also Published As

Publication number Publication date
SE447946B (sv) 1986-12-22
US4277650A (en) 1981-07-07
CA1120622A (en) 1982-03-23

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