JPS575440A - Impulse noise rejector - Google Patents

Impulse noise rejector

Info

Publication number
JPS575440A
JPS575440A JP7986080A JP7986080A JPS575440A JP S575440 A JPS575440 A JP S575440A JP 7986080 A JP7986080 A JP 7986080A JP 7986080 A JP7986080 A JP 7986080A JP S575440 A JPS575440 A JP S575440A
Authority
JP
Japan
Prior art keywords
pulse width
signal
impulse noise
duration time
impulse
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
JP7986080A
Other languages
Japanese (ja)
Inventor
Toshihiko Kono
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.)
Nippon Gakki Co Ltd
Original Assignee
Nippon Gakki 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 Nippon Gakki Co Ltd filed Critical Nippon Gakki Co Ltd
Priority to JP7986080A priority Critical patent/JPS575440A/en
Publication of JPS575440A publication Critical patent/JPS575440A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
    • H03G3/345—Muting during a short period of time when noise pulses are detected, i.e. blanking

Abstract

PURPOSE:To effectively reject impulse noises without much damage to an original signal, by changing a cutoff frequency of a variable filter added with the original signal in accordance with the duration time of the impulse noises. CONSTITUTION:A music signal having an impulse noise from an input terminal is applied to a voltage controlled type LPF filter 12 via signal delay circuit 11. On the other hand, the impulse noise component included in the said music signal is detected at a noise detecting circuit 13 and it is converted into a pulse width signal having a pulse width corresponding to the duration time at a pulse forming circuit 14. Further, this pulse width signal is converted into a DC voltage corresponding to the pulse width at a pulse width/voltage converting circuit 15 and applied to a control terminal of the said voltage variable type LPF filter 12. Thus, if the duration time of impulse noise is short, the cutoff frequency of the LPF filter 12 is higher and inversely, if the duration time of the impulse noise is longer, the cutoff frequency becomes lower.
JP7986080A 1980-06-13 1980-06-13 Impulse noise rejector Pending JPS575440A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7986080A JPS575440A (en) 1980-06-13 1980-06-13 Impulse noise rejector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7986080A JPS575440A (en) 1980-06-13 1980-06-13 Impulse noise rejector

Publications (1)

Publication Number Publication Date
JPS575440A true JPS575440A (en) 1982-01-12

Family

ID=13701947

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7986080A Pending JPS575440A (en) 1980-06-13 1980-06-13 Impulse noise rejector

Country Status (1)

Country Link
JP (1) JPS575440A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6134705A (en) * 1984-07-25 1986-02-19 Sharp Corp Noise eliminating circuit
JPH04170757A (en) * 1990-11-05 1992-06-18 Nec Corp Magnetic recording/reproducing device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6134705A (en) * 1984-07-25 1986-02-19 Sharp Corp Noise eliminating circuit
JPH04170757A (en) * 1990-11-05 1992-06-18 Nec Corp Magnetic recording/reproducing device

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