JPS54120511A - Reception system for digital multi-frequency signal - Google Patents

Reception system for digital multi-frequency signal

Info

Publication number
JPS54120511A
JPS54120511A JP2788178A JP2788178A JPS54120511A JP S54120511 A JPS54120511 A JP S54120511A JP 2788178 A JP2788178 A JP 2788178A JP 2788178 A JP2788178 A JP 2788178A JP S54120511 A JPS54120511 A JP S54120511A
Authority
JP
Japan
Prior art keywords
fourier transform
wave generator
circuit
cosine
multiplied
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.)
Pending
Application number
JP2788178A
Other languages
Japanese (ja)
Inventor
Hitoshi Imagawa
Shiro Kikuchi
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 JP2788178A priority Critical patent/JPS54120511A/en
Publication of JPS54120511A publication Critical patent/JPS54120511A/en
Pending 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)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To simplify the extension of a circuit with its constitution made simple by allowing several signal processing parts to use in common the input and output parts of a MF receiver using a discrete Fourier transform circuit. CONSTITUTION:Several frequency signals inputted via input terminal 11 are multiplied 13 by a window function from a window function generator 14 by way of expander 12 before being inputted to signal distributor 40. Signal distributor 40 distributes several frequency signals to discrete Fourier transform circuits 16, 41 and 42. Signals inputted to Fourier transform circuits 16, 41 and 42 are Fourier-transformed, multiplied 19 and 20 by outputs of sine-wave generator 17 and cosine- wave generator 18, and then integrated 21 and 22 before being added 25 together. Determing each input timing by Fourier transform circuits 16, 41 and 42 makes it possible to use sine-wave generator 17, cosine-wave generator 18 and threshold- level generating circuit 27 in common.
JP2788178A 1978-03-11 1978-03-11 Reception system for digital multi-frequency signal Pending JPS54120511A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2788178A JPS54120511A (en) 1978-03-11 1978-03-11 Reception system for digital multi-frequency signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2788178A JPS54120511A (en) 1978-03-11 1978-03-11 Reception system for digital multi-frequency signal

Publications (1)

Publication Number Publication Date
JPS54120511A true JPS54120511A (en) 1979-09-19

Family

ID=12233224

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2788178A Pending JPS54120511A (en) 1978-03-11 1978-03-11 Reception system for digital multi-frequency signal

Country Status (1)

Country Link
JP (1) JPS54120511A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5669961A (en) * 1979-11-12 1981-06-11 Nec Corp Digital multifrequency signal receiver
JPS5935267A (en) * 1982-08-20 1984-02-25 Matsushita Electric Ind Co Ltd Multimicroprocessor
US6668057B1 (en) 1999-11-24 2003-12-23 Kabushiki Kaisha Toshiba Apparatus for receiving tone signal, apparatus for transmitting tone signal, and apparatus for transmitting or receiving tone signal

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5057710A (en) * 1973-09-25 1975-05-20

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5057710A (en) * 1973-09-25 1975-05-20

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5669961A (en) * 1979-11-12 1981-06-11 Nec Corp Digital multifrequency signal receiver
JPS5935267A (en) * 1982-08-20 1984-02-25 Matsushita Electric Ind Co Ltd Multimicroprocessor
JPS6341103B2 (en) * 1982-08-20 1988-08-15 Matsushita Electric Ind Co Ltd
US6668057B1 (en) 1999-11-24 2003-12-23 Kabushiki Kaisha Toshiba Apparatus for receiving tone signal, apparatus for transmitting tone signal, and apparatus for transmitting or receiving tone signal

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