JPS55147015A - Audio unit mounting on car - Google Patents

Audio unit mounting on car

Info

Publication number
JPS55147015A
JPS55147015A JP5477479A JP5477479A JPS55147015A JP S55147015 A JPS55147015 A JP S55147015A JP 5477479 A JP5477479 A JP 5477479A JP 5477479 A JP5477479 A JP 5477479A JP S55147015 A JPS55147015 A JP S55147015A
Authority
JP
Japan
Prior art keywords
control signal
noise
sound volume
circuit
depending
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
JP5477479A
Other languages
Japanese (ja)
Inventor
Makoto Kobashi
Tsuneji Koshikawa
Yoshio Ariki
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP5477479A priority Critical patent/JPS55147015A/en
Priority to GB8014417A priority patent/GB2050095B/en
Priority to DE19803017312 priority patent/DE3017312A1/en
Publication of JPS55147015A publication Critical patent/JPS55147015A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • 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
    • H03G3/32—Automatic control in amplifiers having semiconductor devices the control being dependent upon ambient noise level or sound level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2430/00—Signal processing covered by H04R, not provided for in its groups
    • H04R2430/01—Aspects of volume control, not necessarily automatic, in sound systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/13—Acoustic transducers and sound field adaptation in vehicles

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

PURPOSE: To perform automatic adjustment of sound volume and quality depending on the amplitude of noise with a simple circuit constitution, by picking up only the component of specific frequency band of noise for control signal.
CONSTITUTION: The time constant circuit 33 determining the response speed in sound volume change consists of the resistors R331, R332 and capacitor C331, and the time constant τ is set to 1∼5 seconds. The control signal from the circuit 33 changes with the band noise passed through the filter 31 which blocks the frequency components about 20Hz or less and passes the frequency components more than those. This control signal is fed to the gate of FETTr42 being the sound volume connected to the emitter of the amplifying transistor Tr41 in the audio signal reproducing circuit 4 in AC. Since Tr42 produces the resistance change between the source and drain depending on the level fed with the control signal, the amplifying factor of Tr41 changes with it. Accordingly, the sound volume adjustment can automatically be made depending on the noise and the driver can enjoy the listening signal safely.
COPYRIGHT: (C)1980,JPO&Japio
JP5477479A 1979-05-07 1979-05-07 Audio unit mounting on car Pending JPS55147015A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP5477479A JPS55147015A (en) 1979-05-07 1979-05-07 Audio unit mounting on car
GB8014417A GB2050095B (en) 1979-05-07 1980-05-01 Sound volume control in an automobile
DE19803017312 DE3017312A1 (en) 1979-05-07 1980-05-06 CONTROL ARRANGEMENT FOR CONTROLLING THE VOLUME FOR TONE SIGNALS EMITTED BY A CAR RADIO

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5477479A JPS55147015A (en) 1979-05-07 1979-05-07 Audio unit mounting on car

Publications (1)

Publication Number Publication Date
JPS55147015A true JPS55147015A (en) 1980-11-15

Family

ID=12980112

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5477479A Pending JPS55147015A (en) 1979-05-07 1979-05-07 Audio unit mounting on car

Country Status (3)

Country Link
JP (1) JPS55147015A (en)
DE (1) DE3017312A1 (en)
GB (1) GB2050095B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57207293A (en) * 1981-06-15 1982-12-18 Pioneer Electronic Corp Automatic sound volue corrector
JPS5826218U (en) * 1981-08-11 1983-02-19 アルパイン株式会社 equalizer device
JPS61116423U (en) * 1984-12-28 1986-07-23
KR100804497B1 (en) 2006-11-23 2008-02-20 주식회사 현대오토넷 Speed pulse stabilization apparatus at auto volume control system

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4644292A (en) * 1984-05-31 1987-02-17 Pioneer Electronic Corporation Automatic gain and frequency characteristic control unit in audio device
JPS61131189U (en) * 1985-02-01 1986-08-16
GB2256102A (en) * 1991-05-24 1992-11-25 Robin Middlemass Howie Automatic level controller for in-vehicle sound system
GB2257317A (en) * 1991-06-26 1993-01-06 Damian Rupert Lindley Automatic volume control for car stereo
FR2696060A1 (en) * 1992-09-22 1994-03-25 Carpentier Claude Method and device for automatically controlling the gain of an amplifier of an electroacoustic system, in particular for a motor vehicle.
FR2765610B1 (en) * 1997-07-04 2003-08-15 Kiekert Ag MOTOR VEHICLE WITH A CLOSING SYSTEM TO BE OPENED OR LOCKED BY REMOTE CONTROL
EP3032741A1 (en) * 2014-12-11 2016-06-15 Alpine Electronics, Inc. Audio signal processing apparatus for a vehicle and signal processing method for a sound system
WO2017174150A1 (en) * 2016-04-08 2017-10-12 Arcelik Anonim Sirketi Image display device with adaptive volume level adjustment function
US9893697B1 (en) * 2017-06-19 2018-02-13 Ford Global Technologies, Llc System and method for selective volume adjustment in a vehicle

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5430817A (en) * 1977-07-15 1979-03-07 Eller Dieter Method of and device for controlling or adjusting effective tone source

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2392218A (en) * 1945-01-09 1946-01-01 Rca Corp Announcing method and system
DE2413829A1 (en) * 1974-03-22 1975-09-25 Hoeh Guenther Dipl Ing Automatic volume control for car radio - matches its output volume to surrounding noise by use of noise transducer
FR2394420A1 (en) * 1975-10-28 1979-01-12 Orlik Henri IMPROVEMENTS TO "AUTO-RADIO" RADIO RECEIVERS
DE2716936A1 (en) * 1977-04-16 1978-10-19 Carl Jaeger Kg Moebelfabrik Car radio amplifier including microphone - uses microphone signal to make gain dependent on noise inside car
DE2903607C2 (en) * 1979-01-31 1985-05-09 Heymann, Andreas, 4300 Essen Control device for volume control of radio reception or LF transmission devices depending on the level of background noise

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5430817A (en) * 1977-07-15 1979-03-07 Eller Dieter Method of and device for controlling or adjusting effective tone source

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57207293A (en) * 1981-06-15 1982-12-18 Pioneer Electronic Corp Automatic sound volue corrector
JPH0129085B2 (en) * 1981-06-15 1989-06-07 Pioneer Electronic Corp
JPS5826218U (en) * 1981-08-11 1983-02-19 アルパイン株式会社 equalizer device
JPS6241452Y2 (en) * 1981-08-11 1987-10-23
JPS61116423U (en) * 1984-12-28 1986-07-23
JPH054335Y2 (en) * 1984-12-28 1993-02-03
KR100804497B1 (en) 2006-11-23 2008-02-20 주식회사 현대오토넷 Speed pulse stabilization apparatus at auto volume control system

Also Published As

Publication number Publication date
DE3017312A1 (en) 1980-11-13
GB2050095B (en) 1983-10-12
GB2050095A (en) 1980-12-31

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