FR2394420A1 - IMPROVEMENTS TO "AUTO-RADIO" RADIO RECEIVERS - Google Patents

IMPROVEMENTS TO "AUTO-RADIO" RADIO RECEIVERS

Info

Publication number
FR2394420A1
FR2394420A1 FR7532839A FR7532839A FR2394420A1 FR 2394420 A1 FR2394420 A1 FR 2394420A1 FR 7532839 A FR7532839 A FR 7532839A FR 7532839 A FR7532839 A FR 7532839A FR 2394420 A1 FR2394420 A1 FR 2394420A1
Authority
FR
France
Prior art keywords
radio
pass
auto
level
stage
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
FR7532839A
Other languages
French (fr)
Other versions
FR2394420B1 (en
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to FR7532839A priority Critical patent/FR2394420A1/en
Priority to DE19762646232 priority patent/DE2646232A1/en
Priority to GB4267776A priority patent/GB1561895A/en
Priority to IT6949076A priority patent/IT1071524B/en
Priority to ES452722A priority patent/ES452722A1/en
Publication of FR2394420A1 publication Critical patent/FR2394420A1/en
Application granted granted Critical
Publication of FR2394420B1 publication Critical patent/FR2394420B1/fr
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
    • H03G3/32—Automatic control in amplifiers having semiconductor devices the control being dependent upon ambient noise level or sound level

Landscapes

  • Control Of Amplification And Gain Control (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Amplifiers (AREA)
  • Circuits Of Receivers In General (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

La nécessité d'effectuer une correction manuelle fréquente du niveau sonore, des récepteurs radiophoniques montés sur les véhicules, étant de nature à disperser l'attention du conducteur, ce qui est dangereux et en même temps désagréable, l'invention vise à réaliser cette manoeuvre automatiquement. Conformément à l'invention, dans ce but on combine une sonde, de préférence piézo-électrique, appropriée pour détecter le niveau des bruits dans le véhicule avec un amplificateur, d'une valeur de << gain >> de 1000 environ et un filtre intermédiaire dit << passe-bas >>, c'est-à-dire qui ne laisse passer que les fréquences de l'ordre de 100 périodes par seconde et en dessous, tandis qu'au surplus, un étage dit << intégrateur >> délivre alors une tension, pour l'appliquer en commande de gain variable au 1**er étage préamplificateur basse fréquence.The need to carry out frequent manual correction of the sound level, of the radio receivers mounted on the vehicles, being such as to disperse the driver's attention, which is dangerous and at the same time unpleasant, the invention aims to achieve this maneuver. automatically. In accordance with the invention, for this purpose, a probe, preferably piezoelectric, suitable for detecting the level of noise in the vehicle, is combined with an amplifier, with a "gain" value of approximately 1000 and a filter. intermediate known as "low pass", that is to say which only allows frequencies of the order of 100 periods per second and below to pass, while in addition, a stage called "integrator" > then delivers a voltage, to apply it in variable gain control to the 1 ** st low frequency preamplifier stage.

FR7532839A 1975-10-28 1975-10-28 IMPROVEMENTS TO "AUTO-RADIO" RADIO RECEIVERS Granted FR2394420A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
FR7532839A FR2394420A1 (en) 1975-10-28 1975-10-28 IMPROVEMENTS TO "AUTO-RADIO" RADIO RECEIVERS
DE19762646232 DE2646232A1 (en) 1975-10-28 1976-10-13 SOUND REPRODUCTION DEVICE
GB4267776A GB1561895A (en) 1975-10-28 1976-10-14 Motor vehicle audio apparatus
IT6949076A IT1071524B (en) 1975-10-28 1976-10-15 SOUND REPRODUCER FOR VEHICLES PARTICULARLY CAR RADIO
ES452722A ES452722A1 (en) 1975-10-28 1976-10-26 Motor vehicle audio apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7532839A FR2394420A1 (en) 1975-10-28 1975-10-28 IMPROVEMENTS TO "AUTO-RADIO" RADIO RECEIVERS

Publications (2)

Publication Number Publication Date
FR2394420A1 true FR2394420A1 (en) 1979-01-12
FR2394420B1 FR2394420B1 (en) 1980-01-04

Family

ID=9161700

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7532839A Granted FR2394420A1 (en) 1975-10-28 1975-10-28 IMPROVEMENTS TO "AUTO-RADIO" RADIO RECEIVERS

Country Status (5)

Country Link
DE (1) DE2646232A1 (en)
ES (1) ES452722A1 (en)
FR (1) FR2394420A1 (en)
GB (1) GB1561895A (en)
IT (1) IT1071524B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2731971B2 (en) * 1977-07-15 1980-05-14 Dieter 4300 Essen Eller Method and device for controlling or regulating a useful sound source
DE2752657A1 (en) * 1977-11-25 1979-06-07 Blaupunkt Werke Gmbh Automatic volume control for car radios - selects narrow frequency band from useful signal and uses its level to control switch connecting microphone to store
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
JPS55147015A (en) * 1979-05-07 1980-11-15 Hitachi Ltd Audio unit mounting on car
US4476571A (en) * 1981-06-15 1984-10-09 Pioneer Electronic Corporation Automatic sound volume control device
JPS583305A (en) * 1981-06-29 1983-01-10 Hitachi Ltd Automatic sound volume adjusting circuit
GB2124048A (en) * 1982-05-13 1984-02-08 Carfield Volume control of electronic games
DE3816918C1 (en) * 1988-05-18 1989-07-27 Adam Opel Ag, 6090 Ruesselsheim, De
GB2257317A (en) * 1991-06-26 1993-01-06 Damian Rupert Lindley Automatic volume control for car stereo

Also Published As

Publication number Publication date
IT1071524B (en) 1985-04-10
FR2394420B1 (en) 1980-01-04
GB1561895A (en) 1980-03-05
DE2646232A1 (en) 1977-05-05
ES452722A1 (en) 1977-10-01

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Legal Events

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