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SE7708218L - RECEIVER FOR NUMBER FREQUENCY SIGNALS - Google Patents

RECEIVER FOR NUMBER FREQUENCY SIGNALS

Info

Publication number
SE7708218L
SE7708218L SE7708218A SE7708218A SE7708218L SE 7708218 L SE7708218 L SE 7708218L SE 7708218 A SE7708218 A SE 7708218A SE 7708218 A SE7708218 A SE 7708218A SE 7708218 L SE7708218 L SE 7708218L
Authority
SE
Sweden
Prior art keywords
receiver
frequency signals
number frequency
signals
frequency
Prior art date
Application number
SE7708218A
Other languages
Swedish (sv)
Inventor
P Bakker
J P Maat
Original Assignee
Philips Nv
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 Philips Nv filed Critical Philips Nv
Publication of SE7708218L publication Critical patent/SE7708218L/en

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
    • H04Q1/46—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency, e.g. speech current

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
SE7708218A 1976-07-20 1977-07-15 RECEIVER FOR NUMBER FREQUENCY SIGNALS SE7708218L (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7608047A NL7608047A (en) 1976-07-20 1976-07-20 RECEIVER FOR TONE-FREQUENT CHARACTERS.

Publications (1)

Publication Number Publication Date
SE7708218L true SE7708218L (en) 1978-01-21

Family

ID=19826629

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7708218A SE7708218L (en) 1976-07-20 1977-07-15 RECEIVER FOR NUMBER FREQUENCY SIGNALS

Country Status (7)

Country Link
JP (1) JPS5313810A (en)
BE (1) BE856903A (en)
BR (1) BR7704723A (en)
DE (1) DE2730453A1 (en)
FR (1) FR2359561A1 (en)
NL (1) NL7608047A (en)
SE (1) SE7708218L (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4696031A (en) * 1985-12-31 1987-09-22 Wang Laboratories, Inc. Signal detection and discrimination using waveform peak factor

Also Published As

Publication number Publication date
DE2730453A1 (en) 1978-01-26
JPS5313810A (en) 1978-02-07
NL7608047A (en) 1978-01-24
BR7704723A (en) 1978-05-16
BE856903A (en) 1978-01-18
FR2359561A1 (en) 1978-02-17

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Legal Events

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