JPS57171870A - Signal deciding circuit for digital multifrequency signal receiver - Google Patents

Signal deciding circuit for digital multifrequency signal receiver

Info

Publication number
JPS57171870A
JPS57171870A JP56057659A JP5765981A JPS57171870A JP S57171870 A JPS57171870 A JP S57171870A JP 56057659 A JP56057659 A JP 56057659A JP 5765981 A JP5765981 A JP 5765981A JP S57171870 A JPS57171870 A JP S57171870A
Authority
JP
Japan
Prior art keywords
signal
frequencies
frequency
combined
bits
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.)
Granted
Application number
JP56057659A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6347184B2 (enrdf_load_stackoverflow
Inventor
Takashi Hatano
Yasunori Ogawa
Masatoshi Kumagai
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP56057659A priority Critical patent/JPS57171870A/ja
Publication of JPS57171870A publication Critical patent/JPS57171870A/ja
Publication of JPS6347184B2 publication Critical patent/JPS6347184B2/ja
Granted 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)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
JP56057659A 1981-04-16 1981-04-16 Signal deciding circuit for digital multifrequency signal receiver Granted JPS57171870A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56057659A JPS57171870A (en) 1981-04-16 1981-04-16 Signal deciding circuit for digital multifrequency signal receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56057659A JPS57171870A (en) 1981-04-16 1981-04-16 Signal deciding circuit for digital multifrequency signal receiver

Publications (2)

Publication Number Publication Date
JPS57171870A true JPS57171870A (en) 1982-10-22
JPS6347184B2 JPS6347184B2 (enrdf_load_stackoverflow) 1988-09-20

Family

ID=13062019

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56057659A Granted JPS57171870A (en) 1981-04-16 1981-04-16 Signal deciding circuit for digital multifrequency signal receiver

Country Status (1)

Country Link
JP (1) JPS57171870A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59125188A (ja) * 1982-12-30 1984-07-19 Fujitsu Ltd デイジタル多周波信号受信方式

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0393180U (enrdf_load_stackoverflow) * 1989-09-21 1991-09-24

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1342904A (en) * 1970-07-31 1974-01-10 Plessey Telecommunications Res Multifrequency data receivers

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1342904A (en) * 1970-07-31 1974-01-10 Plessey Telecommunications Res Multifrequency data receivers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59125188A (ja) * 1982-12-30 1984-07-19 Fujitsu Ltd デイジタル多周波信号受信方式

Also Published As

Publication number Publication date
JPS6347184B2 (enrdf_load_stackoverflow) 1988-09-20

Similar Documents

Publication Publication Date Title
SE9402495D0 (sv) Radiomottagningsanordning
US4395595A (en) Digital pushbutton signalling receiver
JPS6471292A (en) Dial tone detector
CA2027766A1 (en) Multi-frequency signal receiver and a method of detecting the multi-frequency signal
ES486655A1 (es) Perfeccionamientos en aparatos para detectar senales de mul-tifrecuencia en una senal entrante
JPS57171870A (en) Signal deciding circuit for digital multifrequency signal receiver
DE3881090D1 (de) Schaltungsanordnung zum erkennen von doppelton-mehrfrequenzsignalen in fernsprechanlagen.
IE45187L (en) Frequency detection
GB1411418A (en) Signal generators
SU1614130A2 (ru) Устройство дл приема многочастотных сигналов
FI901306A0 (fi) En inkoppling foer separation av en frekvensreferens signal.
GB1501706A (en) Multi-frequency signal receivers
JPS5765902A (en) Fm demodulating circuit
SU1309331A1 (ru) Приемник многочастотных сигналов
JPS5550765A (en) Digital signal receiver
SU794745A1 (ru) Устройство приема сигналов
SU801320A1 (ru) Приемник тонального вызова
JPS55133154A (en) Compensation circuit for cross polarized wave
SU985968A1 (ru) Устройство дл приема дискретных частотно-манипулированных сигналов
SU1070708A1 (ru) Устройство дл приема многочастотных сигналов
JPS61225994A (ja) 多周波信号受信装置
TH2296A (th) การจัดวงจรกรองเพื่อใช้ให้ระบบการทำสัญญาณ
TH1518B (th) การจัดวงจรกรองเพื่อใช้ให้ระบบการทำสัญญาณ
JPS55102960A (en) Signal transmission system
JPS56120239A (en) Simple privacy telephone system