JPS5765948A - Multifrequency signal receiver - Google Patents

Multifrequency signal receiver

Info

Publication number
JPS5765948A
JPS5765948A JP55142601A JP14260180A JPS5765948A JP S5765948 A JPS5765948 A JP S5765948A JP 55142601 A JP55142601 A JP 55142601A JP 14260180 A JP14260180 A JP 14260180A JP S5765948 A JPS5765948 A JP S5765948A
Authority
JP
Japan
Prior art keywords
adders
multipliers
inputted
discrete fourier
positive number
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
JP55142601A
Other languages
Japanese (ja)
Inventor
Kensaku Fujii
Hitoshi Imagawa
Masaharu Kawaguchi
Akira Fukui
Ryujiro Muramatsu
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
Hitachi Ltd
NEC Corp
Nippon Telegraph and Telephone Corp
Oki Electric Industry Co Ltd
Original Assignee
Fujitsu Ltd
Hitachi Ltd
NEC Corp
Nippon Telegraph and Telephone Corp
Oki Electric Industry Co Ltd
Nippon Electric Co 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, Hitachi Ltd, NEC Corp, Nippon Telegraph and Telephone Corp, Oki Electric Industry Co Ltd, Nippon Electric Co Ltd filed Critical Fujitsu Ltd
Priority to JP55142601A priority Critical patent/JPS5765948A/en
Publication of JPS5765948A publication Critical patent/JPS5765948A/en
Pending 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

Landscapes

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

Abstract

PURPOSE:To make discrete Fourier conversion possible without a multistage shift rgister, by using a primary cyclic digital filter, where the filter coefficient is a positive number smaller than 1, in the multifrequency signal converter using discrete Fourier conversion. CONSTITUTION:When an input signal f(nt) is inputted to a terminal 1, cosnomegaT and sinnomegaT supplied from a generating circuit 7 are multiplied by multipliers 31 and 32 and are inputted to adders 41 and 42. Adders 41 and 42 constitute a primary cyclic digital filter together with multipliers 35 and 36 for multiplication of a filter coefficient alpha (alpha is a positive number smaller than 1) and one-period delay registers 51 and 52, and a real part Fc' and an imaginary part Fs' are outputted from adders 41 and 42. The Fc' and the Fs' are squared and are added by an adder 45.
JP55142601A 1980-10-13 1980-10-13 Multifrequency signal receiver Pending JPS5765948A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55142601A JPS5765948A (en) 1980-10-13 1980-10-13 Multifrequency signal receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55142601A JPS5765948A (en) 1980-10-13 1980-10-13 Multifrequency signal receiver

Publications (1)

Publication Number Publication Date
JPS5765948A true JPS5765948A (en) 1982-04-21

Family

ID=15319097

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55142601A Pending JPS5765948A (en) 1980-10-13 1980-10-13 Multifrequency signal receiver

Country Status (1)

Country Link
JP (1) JPS5765948A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100299557B1 (en) * 1991-07-11 2001-09-22 유나이티드 파슬 서어비스 오브 아메리카 인코포레이티드 Digital filter and method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100299557B1 (en) * 1991-07-11 2001-09-22 유나이티드 파슬 서어비스 오브 아메리카 인코포레이티드 Digital filter and method thereof

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