JPS5635538A - Noise detecting circuit - Google Patents

Noise detecting circuit

Info

Publication number
JPS5635538A
JPS5635538A JP11023779A JP11023779A JPS5635538A JP S5635538 A JPS5635538 A JP S5635538A JP 11023779 A JP11023779 A JP 11023779A JP 11023779 A JP11023779 A JP 11023779A JP S5635538 A JPS5635538 A JP S5635538A
Authority
JP
Japan
Prior art keywords
capacitor
pressure dividing
circuit
output
dividing point
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
JP11023779A
Other languages
Japanese (ja)
Inventor
Motoaki Kawasaki
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 Home Electronics Ltd
NEC Corp
Original Assignee
NEC Home Electronics Ltd
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 Home Electronics Ltd, Nippon Electric Co Ltd filed Critical NEC Home Electronics Ltd
Priority to JP11023779A priority Critical patent/JPS5635538A/en
Publication of JPS5635538A publication Critical patent/JPS5635538A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)

Abstract

PURPOSE:To realize an extraction of only the noise component out of the signal, by connecting a capacitor between the output of the low-impedance circuit and the pressure dividing point of the pressure dividing circuit and then keeping the terminal voltage of the capacitor at a constant level by the power source having the same voltage as the pressure dividing point. CONSTITUTION:The envelope curve detection output (a) of the signal input is converted into the low-output impedance via the low-impedance circuit LZ to be applied to the capacitor C4. And at the same time, the switches SW1 and SW2 are turned on only for the period of the differential pulse (b) produced by the differentiating circuit DF1 and DF2 each. The capacitor C4 is connected to the pressure dividing point of the pressure dividing circuit as well as to the power sources E1 and E2 having the same voltage as the pressure dividing point and via the switches SW1 and SW2. And the capacitor C4 is charged or discharged quickly by the power source E1 or E2 every time the level of the output (a) varies,and thus keeps a con stant voltage level. At the same time, the noise component passes through the capacitor C4 in the form of the AC signal. And thus only the noise component is delivered.
JP11023779A 1979-08-31 1979-08-31 Noise detecting circuit Pending JPS5635538A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11023779A JPS5635538A (en) 1979-08-31 1979-08-31 Noise detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11023779A JPS5635538A (en) 1979-08-31 1979-08-31 Noise detecting circuit

Publications (1)

Publication Number Publication Date
JPS5635538A true JPS5635538A (en) 1981-04-08

Family

ID=14530573

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11023779A Pending JPS5635538A (en) 1979-08-31 1979-08-31 Noise detecting circuit

Country Status (1)

Country Link
JP (1) JPS5635538A (en)

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