JPS5795746A - Receiver for multifrequency signal - Google Patents

Receiver for multifrequency signal

Info

Publication number
JPS5795746A
JPS5795746A JP55171248A JP17124880A JPS5795746A JP S5795746 A JPS5795746 A JP S5795746A JP 55171248 A JP55171248 A JP 55171248A JP 17124880 A JP17124880 A JP 17124880A JP S5795746 A JPS5795746 A JP S5795746A
Authority
JP
Japan
Prior art keywords
output
angular frequency
adder
input signal
window 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
JP55171248A
Other languages
Japanese (ja)
Other versions
JPH0150151B2 (en
Inventor
Kensaku Fujii
Shiro Kikuchi
Masaharu Kawaguchi
Akira Fukui
Kazuto Hirose
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 JP55171248A priority Critical patent/JPS5795746A/en
Publication of JPS5795746A publication Critical patent/JPS5795746A/en
Publication of JPH0150151B2 publication Critical patent/JPH0150151B2/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)

Abstract

PURPOSE:To make a receiver for multifrequency signals small-size, by causing an output, which is obtained by multiplying an input signal by a window function, to pass through a primary cyclic digital filter to obtain outputs of a real part and an imaginary part and by obtaining an output proportional to the amplitude of a required angular frequency. CONSTITUTION:An input signal from a terminal 1 is multiplied by the square window function, which is supplied from a window function generator 70, in a multiplier 30, and the output is inputted to an adder 43. A filter coefficient ejomegaT (omega is a required detection angular frequency and T is the sampling period) is given by a primary cyclic digital filter consisting of adders 43-45, multipliers 35-38, and registers 50 and 51 for delay of one sampling period, and the discrete Fourier conversion is executed to output outputs of a real part and an imaginary part to terminals 21r and 21i, respectively. These outputs are squared by multipliers 33 and 34, respectively and are added by an adder 42 to transmit an output proportional to the amplitude of components of the required detection angular frequency omega to a terminal 2. On the basis of the output of the adder 42, it is discriminated whether the input signal having the required detection angular frequency omega exists or not.
JP55171248A 1980-12-04 1980-12-04 Receiver for multifrequency signal Granted JPS5795746A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55171248A JPS5795746A (en) 1980-12-04 1980-12-04 Receiver for multifrequency signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55171248A JPS5795746A (en) 1980-12-04 1980-12-04 Receiver for multifrequency signal

Publications (2)

Publication Number Publication Date
JPS5795746A true JPS5795746A (en) 1982-06-14
JPH0150151B2 JPH0150151B2 (en) 1989-10-27

Family

ID=15919790

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55171248A Granted JPS5795746A (en) 1980-12-04 1980-12-04 Receiver for multifrequency signal

Country Status (1)

Country Link
JP (1) JPS5795746A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0440028A2 (en) * 1990-01-29 1991-08-07 Dialogic Corporation Multifrequency tone signal detector
EP0497115A2 (en) * 1991-02-01 1992-08-05 Blaupunkt-Werke GmbH RDS broadcast receiver
JPH0686338A (en) * 1991-12-31 1994-03-25 American Teleph & Telegr Co <Att> Method for detection of control signal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0440028A2 (en) * 1990-01-29 1991-08-07 Dialogic Corporation Multifrequency tone signal detector
EP0497115A2 (en) * 1991-02-01 1992-08-05 Blaupunkt-Werke GmbH RDS broadcast receiver
JPH0686338A (en) * 1991-12-31 1994-03-25 American Teleph & Telegr Co <Att> Method for detection of control signal

Also Published As

Publication number Publication date
JPH0150151B2 (en) 1989-10-27

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