JPS56153871A - Receiving system for signal-frequency signal - Google Patents

Receiving system for signal-frequency signal

Info

Publication number
JPS56153871A
JPS56153871A JP5552180A JP5552180A JPS56153871A JP S56153871 A JPS56153871 A JP S56153871A JP 5552180 A JP5552180 A JP 5552180A JP 5552180 A JP5552180 A JP 5552180A JP S56153871 A JPS56153871 A JP S56153871A
Authority
JP
Japan
Prior art keywords
signal
frequency
output
input
significant
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
JP5552180A
Other languages
Japanese (ja)
Other versions
JPH022340B2 (en
Inventor
Kenichi Sato
Akira Goto
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry 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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP5552180A priority Critical patent/JPS56153871A/en
Publication of JPS56153871A publication Critical patent/JPS56153871A/en
Publication of JPH022340B2 publication Critical patent/JPH022340B2/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
    • H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency

Landscapes

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

Abstract

PURPOSE:To shorten a detection time to prevent the voice malfunction, by providing a narrow-band filter having the center frequency different from a significant signal, an amplitude limiter, and a signal frequency detecting circuit, in the single frequency receiving system with frequency f1 Hz as the significant signal. CONSTITUTION:The receiving signal input to input terminal 2-1 is input to single tuned circuit 2-2 and is subjected to narrow-band filtering of center frequency f2 Hz different from significant signal f1 Hz. Consequently, in the output signal of single tuned circuit 2-2, frequency f2 Hz is emphasized. If the input signal is voice or the like, a waveform approximating the sine wave of f2 Hz is output. If the input signal consists of only frequency f1 Hz of the significant signal, the sine-wave of f1 Hz is output. These output signals f2 Hz and f1 Hz are converted into square waves and have only the signal of f1+ or -DELTAf1 Hz detected by single frequency detector 2-4. After integrating said signal, its output is output from output terminal 2-6.
JP5552180A 1980-04-28 1980-04-28 Receiving system for signal-frequency signal Granted JPS56153871A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5552180A JPS56153871A (en) 1980-04-28 1980-04-28 Receiving system for signal-frequency signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5552180A JPS56153871A (en) 1980-04-28 1980-04-28 Receiving system for signal-frequency signal

Publications (2)

Publication Number Publication Date
JPS56153871A true JPS56153871A (en) 1981-11-28
JPH022340B2 JPH022340B2 (en) 1990-01-17

Family

ID=13001006

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5552180A Granted JPS56153871A (en) 1980-04-28 1980-04-28 Receiving system for signal-frequency signal

Country Status (1)

Country Link
JP (1) JPS56153871A (en)

Also Published As

Publication number Publication date
JPH022340B2 (en) 1990-01-17

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