JPS54114022A - Digital multi-frequency receiving system - Google Patents

Digital multi-frequency receiving system

Info

Publication number
JPS54114022A
JPS54114022A JP2075178A JP2075178A JPS54114022A JP S54114022 A JPS54114022 A JP S54114022A JP 2075178 A JP2075178 A JP 2075178A JP 2075178 A JP2075178 A JP 2075178A JP S54114022 A JPS54114022 A JP S54114022A
Authority
JP
Japan
Prior art keywords
frequency
output
multiplication
fourier conversion
wind function
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
JP2075178A
Other languages
Japanese (ja)
Other versions
JPH0526400B2 (en
Inventor
Shiro Kikuchi
Hitoshi Imagawa
Yasumasa Iwase
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP2075178A priority Critical patent/JPS54114022A/en
Priority to US06/012,507 priority patent/US4245325A/en
Priority to CA322,210A priority patent/CA1110349A/en
Priority to SE7901642A priority patent/SE429389B/en
Priority to BE193659A priority patent/BE874407A/en
Publication of JPS54114022A publication Critical patent/JPS54114022A/en
Publication of JPH0526400B2 publication Critical patent/JPH0526400B2/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Complex Calculations (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE: To reduce the multiplication frequency for the receiver as a whole and to constitute the receiver with the general-purpose processor by including part of the multiplication of the discrete Fourier conversion into the wind function multiplication.
CONSTITUTION: The 80 units of the sample signal which are sampled during the least common multiple 10m sec. in the cycle of the multi-frequency signal frequency are turned to signals X0∼X79 which are multiplied by the wind function and then divided into 5 groups to be applied to 5 high-speed Fourier conversion parts 1∼5. These conversion parts are constituted so that the multiplying frequency may be reduced by including the necessary multiplication into the wind function. At the same time, the operation is omitted for the output in which the partial output of the high-speed Fourier conversion is turned to the common-profit complex number. The output of the conversion parts are compounded together so that the output corresponding to the same frequency each may be all multiplied to be converted into Fourier conversion output X7, X9...X17 against frequency 700, 900, 1100, 1300 and 1700Hz composing the MF signal.
COPYRIGHT: (C)1979,JPO&Japio
JP2075178A 1978-02-24 1978-02-24 Digital multi-frequency receiving system Granted JPS54114022A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2075178A JPS54114022A (en) 1978-02-24 1978-02-24 Digital multi-frequency receiving system
US06/012,507 US4245325A (en) 1978-02-24 1979-02-15 Digital multifrequency signalling receiver
CA322,210A CA1110349A (en) 1978-02-24 1979-02-23 Digital multifrequency signalling receiver
SE7901642A SE429389B (en) 1978-02-24 1979-02-23 DIGITAL MULTI FREQUENCY SIGNAL RECEIVER SYSTEM
BE193659A BE874407A (en) 1978-02-24 1979-02-23 DIGITAL MULTI-FREQUENCY SIGNALING RECEPTION SYSTEM

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2075178A JPS54114022A (en) 1978-02-24 1978-02-24 Digital multi-frequency receiving system

Publications (2)

Publication Number Publication Date
JPS54114022A true JPS54114022A (en) 1979-09-05
JPH0526400B2 JPH0526400B2 (en) 1993-04-15

Family

ID=12035883

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2075178A Granted JPS54114022A (en) 1978-02-24 1978-02-24 Digital multi-frequency receiving system

Country Status (2)

Country Link
JP (1) JPS54114022A (en)
BE (1) BE874407A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6041387A (en) * 1983-08-17 1985-03-05 Nec Corp Signal processing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6041387A (en) * 1983-08-17 1985-03-05 Nec Corp Signal processing device

Also Published As

Publication number Publication date
JPH0526400B2 (en) 1993-04-15
BE874407A (en) 1979-06-18

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