IT943926B - Apparecchiatura e procedimento per la rilevazione di toni audio in pa rallelo - Google Patents

Apparecchiatura e procedimento per la rilevazione di toni audio in pa rallelo

Info

Publication number
IT943926B
IT943926B IT32352/71A IT3235271A IT943926B IT 943926 B IT943926 B IT 943926B IT 32352/71 A IT32352/71 A IT 32352/71A IT 3235271 A IT3235271 A IT 3235271A IT 943926 B IT943926 B IT 943926B
Authority
IT
Italy
Prior art keywords
rallelo
procedure
detection
equipment
audio tones
Prior art date
Application number
IT32352/71A
Other languages
English (en)
Original Assignee
Ibm
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 Ibm filed Critical Ibm
Application granted granted Critical
Publication of IT943926B publication Critical patent/IT943926B/it

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)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Measuring Frequencies, Analyzing Spectra (AREA)
IT32352/71A 1970-12-18 1971-12-14 Apparecchiatura e procedimento per la rilevazione di toni audio in pa rallelo IT943926B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US9938370A 1970-12-18 1970-12-18

Publications (1)

Publication Number Publication Date
IT943926B true IT943926B (it) 1973-04-10

Family

ID=22274755

Family Applications (1)

Application Number Title Priority Date Filing Date
IT32352/71A IT943926B (it) 1970-12-18 1971-12-14 Apparecchiatura e procedimento per la rilevazione di toni audio in pa rallelo

Country Status (7)

Country Link
US (1) US3686576A (it)
JP (1) JPS5123402B1 (it)
CA (1) CA940206A (it)
DE (1) DE2159059A1 (it)
FR (1) FR2118090B1 (it)
GB (1) GB1359693A (it)
IT (1) IT943926B (it)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA984068A (en) * 1972-08-10 1976-02-17 Alexander D. Proudfoot Method and apparatus for detecting the presence of signal components of predetermined frequency in a multi-frequency signal
CH619332A5 (en) * 1976-02-02 1980-09-15 Intertel Ii Inc Signal-controlled system for optional blocking or unblocking of a transmission line, and use of the system
FR2370386A1 (fr) * 1976-11-05 1978-06-02 Constr Telephoniques Melangeur pour recepteur de signaux multifrequences
FR2373926A1 (fr) * 1976-12-10 1978-07-07 Constr Telephoniques Recepteur de signaux multifrequences
US6674855B1 (en) 1999-10-06 2004-01-06 Comverse Ltd. High performance multifrequency signal detection

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL91655C (it) * 1900-01-01
US3189835A (en) * 1961-05-01 1965-06-15 Anelex Corp Pulse retiming system
US3219935A (en) * 1961-08-08 1965-11-23 Yokogawa Electric Corp Measuring-counting system for determining and control-circuit for continuously providing exact multiple of unknown frequency input
US3354398A (en) * 1965-06-07 1967-11-21 Collins Radio Co Digital frequency comparator
DE1563618B1 (de) * 1966-06-21 1970-12-17 Philips Patentverwaltung Mehrfach-Regelanordnung fuer Regelkreise,deren Regelgroessen in einem durch die Einzel-Sollwerte bestimmten Verhaeltnis stehen sollen
US3501701A (en) * 1967-06-19 1970-03-17 Nasa Digital frequency discriminator
SE324835B (it) * 1968-10-14 1970-06-15 Asea Ab

Also Published As

Publication number Publication date
FR2118090A1 (it) 1972-07-28
GB1359693A (en) 1974-07-10
FR2118090B1 (it) 1974-06-07
JPS5123402B1 (it) 1976-07-16
DE2159059A1 (de) 1972-06-22
CA940206A (en) 1974-01-15
US3686576A (en) 1972-08-22

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