JPS5461404A - Adaptive signal detector - Google Patents

Adaptive signal detector

Info

Publication number
JPS5461404A
JPS5461404A JP12847477A JP12847477A JPS5461404A JP S5461404 A JPS5461404 A JP S5461404A JP 12847477 A JP12847477 A JP 12847477A JP 12847477 A JP12847477 A JP 12847477A JP S5461404 A JPS5461404 A JP S5461404A
Authority
JP
Japan
Prior art keywords
value
signal
memory
level
threshold value
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
JP12847477A
Other languages
Japanese (ja)
Inventor
Yutaka Okumura
Eijiro Hishida
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
Nippon Telegraph and Telephone Corp
Original Assignee
NEC Corp
Nippon Telegraph and Telephone 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 Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP12847477A priority Critical patent/JPS5461404A/en
Publication of JPS5461404A publication Critical patent/JPS5461404A/en
Pending legal-status Critical Current

Links

Landscapes

  • Monitoring And Testing Of Transmission In General (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE: To enable to detect the signal even to lower level, by cnanging the threshold value judging the presence of the input signal depending on the minimum value of the measured value for the input signal level of the signal detection circuit.
CONSTITUTION: The signal detector 21 detects the non-communication state and the memory 24 is preset and outputs predetermined value. When the line is connected, the monitor signal is inverted and the output of the cetector 21 is made OFF by detecting it. The level detector 1 calculates the signal power, the result is compared with the content of the memory 24 with the comparator 23, the switch 25 is ocntrolled, and smaller value is written in the memory. When this operation is repeated, the content of memory becomes a value corresponding to the minimum level. This value is used for the threshold value of the comparator 3 by applying a suitable coefficient with the coefficient unit 26. Since small threshold value is used, detection is possible even to lower level
COPYRIGHT: (C)1979,JPO&Japio
JP12847477A 1977-10-25 1977-10-25 Adaptive signal detector Pending JPS5461404A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12847477A JPS5461404A (en) 1977-10-25 1977-10-25 Adaptive signal detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12847477A JPS5461404A (en) 1977-10-25 1977-10-25 Adaptive signal detector

Publications (1)

Publication Number Publication Date
JPS5461404A true JPS5461404A (en) 1979-05-17

Family

ID=14985617

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12847477A Pending JPS5461404A (en) 1977-10-25 1977-10-25 Adaptive signal detector

Country Status (1)

Country Link
JP (1) JPS5461404A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50124508A (en) * 1973-03-12 1975-09-30
JPS5154703A (en) * 1974-11-08 1976-05-14 Oki Electric Ind Co Ltd
JPS5295915A (en) * 1976-02-06 1977-08-12 Nec Corp Adaptable audio detection circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50124508A (en) * 1973-03-12 1975-09-30
JPS5154703A (en) * 1974-11-08 1976-05-14 Oki Electric Ind Co Ltd
JPS5295915A (en) * 1976-02-06 1977-08-12 Nec Corp Adaptable audio detection circuit

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