JPS52122016A - Malfunction prevention system of signal receiver - Google Patents

Malfunction prevention system of signal receiver

Info

Publication number
JPS52122016A
JPS52122016A JP3845676A JP3845676A JPS52122016A JP S52122016 A JPS52122016 A JP S52122016A JP 3845676 A JP3845676 A JP 3845676A JP 3845676 A JP3845676 A JP 3845676A JP S52122016 A JPS52122016 A JP S52122016A
Authority
JP
Japan
Prior art keywords
signal receiver
prevention system
malfunction prevention
signal
malfunction
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
JP3845676A
Other languages
Japanese (ja)
Inventor
Hiroshi Hara
Yasuo Saka
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 JP3845676A priority Critical patent/JPS52122016A/en
Publication of JPS52122016A publication Critical patent/JPS52122016A/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 prevent the malfunction without adopting the signal in case of the presence of level difference more than the fixed between the maximum level value and the minimum level value of the signal acting within the constant time after detecting the presence of signal.
JP3845676A 1976-04-06 1976-04-06 Malfunction prevention system of signal receiver Pending JPS52122016A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3845676A JPS52122016A (en) 1976-04-06 1976-04-06 Malfunction prevention system of signal receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3845676A JPS52122016A (en) 1976-04-06 1976-04-06 Malfunction prevention system of signal receiver

Publications (1)

Publication Number Publication Date
JPS52122016A true JPS52122016A (en) 1977-10-13

Family

ID=12525756

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3845676A Pending JPS52122016A (en) 1976-04-06 1976-04-06 Malfunction prevention system of signal receiver

Country Status (1)

Country Link
JP (1) JPS52122016A (en)

Similar Documents

Publication Publication Date Title
JPS52122016A (en) Malfunction prevention system of signal receiver
JPS51145256A (en) Signal detecting circuit
JPS5224100A (en) Invasion alarm device
JPS5363910A (en) Audible signal sound signal detection system
JPS5431213A (en) Data transmission system
JPS51135401A (en) Automatical station selection device
JPS5359400A (en) Annunciator
JPS52106614A (en) Signal detection
JPS52116149A (en) Control unit
JPS5315171A (en) Signal level detection circuit
JPS5287009A (en) Signal detection system of magnetic memory unit
JPS5242098A (en) Fire alarm unit
JPS53118912A (en) Malfunction preventing system for signal receiver
JPS5223296A (en) Fire receiver
JPS52116150A (en) Control unit
JPS5277540A (en) Detection signal compensation signal
JPS5376786A (en) Receiver of fire alarm system
JPS5420625A (en) Fault discrimination ststem of memory system
JPS5371542A (en) Noise detecting system
JPS5243325A (en) Threshold value decisive system for detecting light-pen signal
JPS5228832A (en) Information transmission system
JPS5351776A (en) Saturation detector
JPS53144300A (en) Alarm device
JPS52114298A (en) Automatic alarming device
JPS5375815A (en) Multi-pass disturbance quantity indication system of receiver