JPS573459A - Frequency selecting device - Google Patents

Frequency selecting device

Info

Publication number
JPS573459A
JPS573459A JP7642880A JP7642880A JPS573459A JP S573459 A JPS573459 A JP S573459A JP 7642880 A JP7642880 A JP 7642880A JP 7642880 A JP7642880 A JP 7642880A JP S573459 A JPS573459 A JP S573459A
Authority
JP
Japan
Prior art keywords
signal
selection circuit
selecting device
signals
subtractor
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
JP7642880A
Other languages
Japanese (ja)
Inventor
Yoshiro Hoshino
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP7642880A priority Critical patent/JPS573459A/en
Publication of JPS573459A publication Critical patent/JPS573459A/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
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted

Landscapes

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

Abstract

PURPOSE:To obtain selecting device having characteristic more prominent than a selected band pass filter, by making subtraction of a signal to be selected from the sum of all other signals, among input signals mixed with a plurality of frequencies. CONSTITUTION:A signal applied to band pass filter groups 2-1-2-n from a signal inpt 1 is detected at detection circuits 3-1-3-n and applied to a selection circuit 4 and an inverse selection circuit 7 as a detection signal. Further, a signal selected at the selection circuit 4 is applied to a subtractor 5 with the signal from a selection designating signal generator 9, and all other signals than the said selected signal are outputted at the inverse selection circuit 7 and applied to an adder 8, and addition is made through suitable adjustment, and the output is applied to the subtractor 5 to obtain a signal output 6. Thus, the frequency can be selected with characteristics more prominent than the characteristic of the selected band filter.
JP7642880A 1980-06-06 1980-06-06 Frequency selecting device Pending JPS573459A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7642880A JPS573459A (en) 1980-06-06 1980-06-06 Frequency selecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7642880A JPS573459A (en) 1980-06-06 1980-06-06 Frequency selecting device

Publications (1)

Publication Number Publication Date
JPS573459A true JPS573459A (en) 1982-01-08

Family

ID=13604890

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7642880A Pending JPS573459A (en) 1980-06-06 1980-06-06 Frequency selecting device

Country Status (1)

Country Link
JP (1) JPS573459A (en)

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