JPS5560355A - Level detection circuit - Google Patents

Level detection circuit

Info

Publication number
JPS5560355A
JPS5560355A JP13341878A JP13341878A JPS5560355A JP S5560355 A JPS5560355 A JP S5560355A JP 13341878 A JP13341878 A JP 13341878A JP 13341878 A JP13341878 A JP 13341878A JP S5560355 A JPS5560355 A JP S5560355A
Authority
JP
Japan
Prior art keywords
level
detection level
hysteresis width
detection
input
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
JP13341878A
Other languages
Japanese (ja)
Inventor
Takashi Yokogawa
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 JP13341878A priority Critical patent/JPS5560355A/en
Publication of JPS5560355A publication Critical patent/JPS5560355A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/10—Control of transmission; Equalising by pilot signal

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

PURPOSE:To make it possible to adjust a detection level with hysteresis width kept constant by varying a comparison reference potential on detecting a drop in level. CONSTITUTION:When a pilot level is normal and an input level is less than detection level VTH, transistor TR2 is OFF and level decrease detection level D' is equal to 20log[VrefR2/(R1+(R8//R9)+R2)]/Vst(Vst is an input voltage at a standard level). On the other hand, when the pilot level lowers abnormally and the input level is greater than the detection level, TR2 turns ON and at this time, hysteresis width H' becomes equal to H'(dB)=20log[1+K(R1+(R8//R9)/R2)]. As a result, equalizing VELto KVref varies the detection level, so that even if Vref is varied in value, the hysteresis width will unconditionally be determined by the value of K.
JP13341878A 1978-10-30 1978-10-30 Level detection circuit Pending JPS5560355A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13341878A JPS5560355A (en) 1978-10-30 1978-10-30 Level detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13341878A JPS5560355A (en) 1978-10-30 1978-10-30 Level detection circuit

Publications (1)

Publication Number Publication Date
JPS5560355A true JPS5560355A (en) 1980-05-07

Family

ID=15104300

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13341878A Pending JPS5560355A (en) 1978-10-30 1978-10-30 Level detection circuit

Country Status (1)

Country Link
JP (1) JPS5560355A (en)

Similar Documents

Publication Publication Date Title
JPS54158536A (en) Current control circuit for ignition device
JPS5560355A (en) Level detection circuit
JPS53116412A (en) Checker for semiconductor regulator
JPS5733493A (en) Semiconductor storage device
JPS5518155A (en) Power amplifier
JPS5425831A (en) Latent image stabilizing method
JPS5624567A (en) Humidity measuring system
SE8402390L (en) MAGNETIC VALVE WITH CONTROLLED MAGNETIZING CURRENT
JPS5690272A (en) Lifetime detector for nonadjusted battery
JPS5518710A (en) Positive and negative follow-up power circuit
JPS5539413A (en) Schmitt trigger circuit
JPS5779457A (en) Voltage comparing circuit
JPS5443516A (en) System stabilizer
JPS5331951A (en) Selection checking circuit
JPS55116271A (en) Battery voltage detector
JPS57196623A (en) Output controlling circuit
JPS5616311A (en) Transistor circuit
JPS5515537A (en) Voltage control circuit
JPS556857A (en) Semiconductor integrated circuit
JPS5710819A (en) Dummy circuit of switching regulator
JPS5762404A (en) Process control system
JPS5621071A (en) Signal level indicator
JPS5693487A (en) Afc circuit
JPS56943A (en) Temperature control circuit
JPS52110556A (en) Gain control device