GB1512783A - Road vehicle audio system - Google Patents

Road vehicle audio system

Info

Publication number
GB1512783A
GB1512783A GB2253174A GB2253174A GB1512783A GB 1512783 A GB1512783 A GB 1512783A GB 2253174 A GB2253174 A GB 2253174A GB 2253174 A GB2253174 A GB 2253174A GB 1512783 A GB1512783 A GB 1512783A
Authority
GB
United Kingdom
Prior art keywords
amplifier
loudspeaker
sound
stereophonic
feeds
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.)
Expired
Application number
GB2253174A
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.)
Lucas Electrical Co Ltd
Original Assignee
Lucas Electrical 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 Lucas Electrical Co Ltd filed Critical Lucas Electrical Co Ltd
Priority to GB2253174A priority Critical patent/GB1512783A/en
Priority to IT4965475A priority patent/IT1035775B/en
Priority to FR7516525A priority patent/FR2272529B1/fr
Publication of GB1512783A publication Critical patent/GB1512783A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/30—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor
    • H03F3/3069—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor the emitters of complementary power transistors being connected to the output
    • H03F3/3071—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor the emitters of complementary power transistors being connected to the output with asymmetrical driving of the end stage
    • 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
    • H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic

Abstract

1512783 Sound reproducing circuits LUCAS ELECTRICAL Ltd 8 May 1975 [21 May 1974] 22531/74 Headings H4J and H4R A road vehicle audio system has a loudspeaker driven by a main amplifier which also feeds a second amplifier incorporating a low pass filter. A further loudspeaker is driven by the second amplifier. Preferably the main amplifier is stereophonic and feeds two stereophonically related loudspeakers. A cartridge or cassette player or radio 41 feeds a stereophonic amplifier 42 whose outputs are applied to loudspeakers 43, 44 positioned under the front seats of a road vehicle as described in Specification 1,404,316. A bass boost amplifier 40 having a low pass passive filter and a feedback path which provides a low pass active filter is connected between the outputs of stereophonic amplifer (42), (see Fig. 1, not shown) and a loudspeaker 36 located virtually anywhere in the vehicle. A potentiometer (18) in amplifier (40) (see also Fig. 1) sets the level of sound from speaker 36 relative to the sound from speakers 43, 44. Volume control 42a of amplifier 42 affects the sound signal from loudspeaker 36 and tone controls 42b may also affect this sound signal. The amplifier 40 is described and claimed in Specification 1,512,784.
GB2253174A 1974-05-21 1974-05-21 Road vehicle audio system Expired GB1512783A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB2253174A GB1512783A (en) 1974-05-21 1974-05-21 Road vehicle audio system
IT4965475A IT1035775B (en) 1974-05-21 1975-05-19 AUDIO SYSTEM FOR VEHICLES
FR7516525A FR2272529B1 (en) 1974-05-21 1975-05-20

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2253174A GB1512783A (en) 1974-05-21 1974-05-21 Road vehicle audio system

Publications (1)

Publication Number Publication Date
GB1512783A true GB1512783A (en) 1978-06-01

Family

ID=10180897

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2253174A Expired GB1512783A (en) 1974-05-21 1974-05-21 Road vehicle audio system

Country Status (3)

Country Link
FR (1) FR2272529B1 (en)
GB (1) GB1512783A (en)
IT (1) IT1035775B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2118808A (en) * 1982-04-20 1983-11-02 Neutrik Ag Stereophonic sound reproduction in motor vehicles
US4495638A (en) * 1978-05-17 1985-01-22 Body Sonic Kabushiki Kaisha Audio-band electro-mechanical vibration converter
EP0991297A2 (en) * 1998-10-01 2000-04-05 Murata Manufacturing Co., Ltd. 3D woofer drive circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4495638A (en) * 1978-05-17 1985-01-22 Body Sonic Kabushiki Kaisha Audio-band electro-mechanical vibration converter
GB2118808A (en) * 1982-04-20 1983-11-02 Neutrik Ag Stereophonic sound reproduction in motor vehicles
EP0991297A2 (en) * 1998-10-01 2000-04-05 Murata Manufacturing Co., Ltd. 3D woofer drive circuit
EP0991297A3 (en) * 1998-10-01 2006-05-10 Murata Manufacturing Co., Ltd. 3D woofer drive circuit

Also Published As

Publication number Publication date
FR2272529A1 (en) 1975-12-19
FR2272529B1 (en) 1978-06-09
IT1035775B (en) 1979-10-20

Similar Documents

Publication Publication Date Title
US4408095A (en) Acoustic apparatus
JP3097340B2 (en) Headphone equipment
WO1989000802A1 (en) Extended imaging split mode loudspeaker system
GB1425519A (en) Stereophonic signal reproducing apparatus
US3941931A (en) Audio signal mixing system
US3893038A (en) Automatic gain control circuit
GB1512783A (en) Road vehicle audio system
US6687378B1 (en) Vehicle-mounted acoustic system
JPS63194500A (en) Stereoscopic reproducing device
US4167651A (en) Mixing two signals derived from an audio source without oscillation
JPS5546646A (en) Speaker system
GB1517938A (en) Headphone system
JPS59165600A (en) Acoustic device for car
JPH07203575A (en) Headphone system,
JPH0383492A (en) Car audio equipment
CA1132460A (en) Monitor ampliphones
JPS6022710Y2 (en) amplifier output circuit
JPH0418760B2 (en)
JPH0117919Y2 (en)
GB1356843A (en) Stereophonic sound systems
KR100294250B1 (en) Acuostic phase shift system
JPH0553118B2 (en)
FR2373937A1 (en) HI=FI sound reproduction system - extracts LF components from pre-amplifier and feeds them to separate power amplifier which drives bass speaker additional to stereo speakers
JPS60144388U (en) Audio equipment for stereo listening
JP2654267B2 (en) Sound equipment

Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee