GB1354010A - Multifrequency signal receivers - Google Patents

Multifrequency signal receivers

Info

Publication number
GB1354010A
GB1354010A GB5821271A GB5821271A GB1354010A GB 1354010 A GB1354010 A GB 1354010A GB 5821271 A GB5821271 A GB 5821271A GB 5821271 A GB5821271 A GB 5821271A GB 1354010 A GB1354010 A GB 1354010A
Authority
GB
United Kingdom
Prior art keywords
frequency
time
frequencies
scanned
circuit
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
GB5821271A
Other languages
English (en)
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.)
AT&T Corp
Original Assignee
Western Electric Co 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 Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of GB1354010A publication Critical patent/GB1354010A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/30—Systems using multi-frequency codes wherein each code element is represented by a combination of frequencies
    • 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
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Filters That Use Time-Delay Elements (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
GB5821271A 1970-12-18 1971-12-15 Multifrequency signal receivers Expired GB1354010A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US9942170A 1970-12-18 1970-12-18

Publications (1)

Publication Number Publication Date
GB1354010A true GB1354010A (en) 1974-06-05

Family

ID=22274926

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5821271A Expired GB1354010A (en) 1970-12-18 1971-12-15 Multifrequency signal receivers

Country Status (7)

Country Link
US (1) US3692953A (enExample)
BE (1) BE776664A (enExample)
CA (1) CA953368A (enExample)
DE (1) DE2161979A1 (enExample)
FR (1) FR2118046B1 (enExample)
GB (1) GB1354010A (enExample)
IT (1) IT943299B (enExample)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6693957B1 (en) * 1998-12-31 2004-02-17 Nortel Networks Limited Adaptive front end for discrete multitone modem

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3223783A (en) * 1960-05-09 1965-12-14 Fuji Tsushinki Seizo Kk Time-division multiplex voice-frequency discriminator
NL267564A (enExample) * 1960-08-22
US3296463A (en) * 1963-10-21 1967-01-03 Princeton Applied Res Corp Frequency responsive network
US3288940A (en) * 1963-10-24 1966-11-29 Automatic Elect Lab Multifrequency signal receiver
US3445606A (en) * 1966-03-21 1969-05-20 Stromberg Carlson Corp Multifrequency detection system including a frequency multiplying circuit
FR1536854A (fr) * 1966-09-17 1968-08-16 Int Standard Electric Corp Perfectionnements aux récepteurs de signaux électriques alternatifs

Also Published As

Publication number Publication date
CA953368A (en) 1974-08-20
BE776664A (fr) 1972-04-04
FR2118046A1 (enExample) 1972-07-28
FR2118046B1 (enExample) 1977-01-28
DE2161979A1 (de) 1972-07-06
IT943299B (it) 1973-04-02
US3692953A (en) 1972-09-19

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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