GB1512783A - Road vehicle audio system - Google Patents
Road vehicle audio systemInfo
- 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
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.
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)
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 |
-
1974
- 1974-05-21 GB GB2253174A patent/GB1512783A/en not_active Expired
-
1975
- 1975-05-19 IT IT4965475A patent/IT1035775B/en active
- 1975-05-20 FR FR7516525A patent/FR2272529B1/fr not_active Expired
Cited By (4)
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 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |