JPS5550746A - Noise reduction unit for automobile audio equipment - Google Patents

Noise reduction unit for automobile audio equipment

Info

Publication number
JPS5550746A
JPS5550746A JP12398478A JP12398478A JPS5550746A JP S5550746 A JPS5550746 A JP S5550746A JP 12398478 A JP12398478 A JP 12398478A JP 12398478 A JP12398478 A JP 12398478A JP S5550746 A JPS5550746 A JP S5550746A
Authority
JP
Japan
Prior art keywords
output
circuit
noise
audio
electric field
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.)
Granted
Application number
JP12398478A
Other languages
Japanese (ja)
Other versions
JPS6134302B2 (en
Inventor
Taiji Oomori
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.)
Honda Motor Co Ltd
Original Assignee
Honda Motor 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 Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to JP12398478A priority Critical patent/JPS5550746A/en
Publication of JPS5550746A publication Critical patent/JPS5550746A/en
Publication of JPS6134302B2 publication Critical patent/JPS6134302B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • 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

Landscapes

  • Noise Elimination (AREA)

Abstract

PURPOSE:To warrant the audio characteristics pleasant in actual sence without intermittence of audio output at noise mixing, by controlling the variable low band filter with the signal adding the output of the noise detection circuit and field strength detector circuit. CONSTITUTION:The output of the detection amplifying circuit 3 of AM and FM radio receiver is inputted to the noise detection circuit 6. The circuit 6 detects pulsative noise mixed in the audio signal and consists of the circuit storing the peak value tentatively. Further, the output from the intermediate frequency amplifying circuit 2 is received at the electric field strength detection circuit 7, which outputs the voltage signal inversely proportional to the electric field of received electromagnetic waves. The output of the circuits 6 and 7 is added at the addition circuit 8 and the output controls the variable LPF9. LPF9 adjusts the cut off frequency of the output of the circuit 3 according to the output of the circuit 8 and the speaker 5 is driven via the output amplifier 4. Thus, even at pulsative noise mixing or electric field lowering, although the sound quality is more or less lowered tentatively, no sound is interrupted and pleasant audio performance can be obtained.
JP12398478A 1978-10-07 1978-10-07 Noise reduction unit for automobile audio equipment Granted JPS5550746A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12398478A JPS5550746A (en) 1978-10-07 1978-10-07 Noise reduction unit for automobile audio equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12398478A JPS5550746A (en) 1978-10-07 1978-10-07 Noise reduction unit for automobile audio equipment

Publications (2)

Publication Number Publication Date
JPS5550746A true JPS5550746A (en) 1980-04-12
JPS6134302B2 JPS6134302B2 (en) 1986-08-07

Family

ID=14874156

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12398478A Granted JPS5550746A (en) 1978-10-07 1978-10-07 Noise reduction unit for automobile audio equipment

Country Status (1)

Country Link
JP (1) JPS5550746A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5769339U (en) * 1980-10-14 1982-04-26
JPS57148935U (en) * 1981-03-12 1982-09-18
US4469164A (en) * 1981-05-15 1984-09-04 Toyota Jidosha Kogyo Kabushiki Kaisha Method of and apparatus for inspecting the quality of a casting produced by a die-casting machine
US4480335A (en) * 1981-05-28 1984-10-30 Sanyo Electric Company Ltd. Noise removing apparatus in an FM receiver
JPS6054262A (en) * 1983-05-09 1985-03-28 Ube Ind Ltd Method for controlling and monitoring cylinder speed of injection molding machine
JPS61174827A (en) * 1983-09-26 1986-08-06 フィリップス　エレクトロニクス　ネムローゼ　フェンノートシャップ Reception jamming detector during reception of uhf-fm broadcasting
JPS62151259A (en) * 1985-12-25 1987-07-06 Ube Ind Ltd Method for discriminating defectiveness and non-defectiveness of molding in injection molding device
JPH0318464A (en) * 1989-06-13 1991-01-28 Kobe Steel Ltd Using together with local pressurizing type die casting apparatus
EP1213832A1 (en) * 2000-12-05 2002-06-12 Semiconductor Ideas to The Market (ItoM) BV AM receiver with audio filtering means
JP2013009066A (en) * 2011-06-23 2013-01-10 Toyota Motor Corp In-vehicle radio noise reducing system

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5769339U (en) * 1980-10-14 1982-04-26
JPS57148935U (en) * 1981-03-12 1982-09-18
US4469164A (en) * 1981-05-15 1984-09-04 Toyota Jidosha Kogyo Kabushiki Kaisha Method of and apparatus for inspecting the quality of a casting produced by a die-casting machine
US4480335A (en) * 1981-05-28 1984-10-30 Sanyo Electric Company Ltd. Noise removing apparatus in an FM receiver
JPH0310428B2 (en) * 1983-05-09 1991-02-13 Ube Industries
JPS6054262A (en) * 1983-05-09 1985-03-28 Ube Ind Ltd Method for controlling and monitoring cylinder speed of injection molding machine
JPS61174827A (en) * 1983-09-26 1986-08-06 フィリップス　エレクトロニクス　ネムローゼ　フェンノートシャップ Reception jamming detector during reception of uhf-fm broadcasting
JPS62151259A (en) * 1985-12-25 1987-07-06 Ube Ind Ltd Method for discriminating defectiveness and non-defectiveness of molding in injection molding device
JPH0356144B2 (en) * 1985-12-25 1991-08-27
JPH0318464A (en) * 1989-06-13 1991-01-28 Kobe Steel Ltd Using together with local pressurizing type die casting apparatus
EP1213832A1 (en) * 2000-12-05 2002-06-12 Semiconductor Ideas to The Market (ItoM) BV AM receiver with audio filtering means
WO2002047260A3 (en) * 2000-12-05 2004-01-08 Semiconductor Ideas Market Bv Am receiver with audio filtering means
US6993305B2 (en) 2000-12-05 2006-01-31 Kasperkovitz Wolfdietrich Geor AM receiver with audio filtering means
JP2013009066A (en) * 2011-06-23 2013-01-10 Toyota Motor Corp In-vehicle radio noise reducing system

Also Published As

Publication number Publication date
JPS6134302B2 (en) 1986-08-07

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