BE768184A - QUADRIPHONE RECORDING AND PLAYBACK SYSTEM - Google Patents
QUADRIPHONE RECORDING AND PLAYBACK SYSTEMInfo
- Publication number
- BE768184A BE768184A BE768184A BE768184A BE768184A BE 768184 A BE768184 A BE 768184A BE 768184 A BE768184 A BE 768184A BE 768184 A BE768184 A BE 768184A BE 768184 A BE768184 A BE 768184A
- Authority
- BE
- Belgium
- Prior art keywords
- quadriphone
- recording
- playback system
- playback
- quadriphone recording
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S3/00—Systems employing more than two channels, e.g. quadraphonic
- H04S3/02—Systems employing more than two channels, e.g. quadraphonic of the matrix type, i.e. in which input signals are combined algebraically, e.g. after having been phase shifted with respect to each other
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Algebra (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Mathematical Physics (AREA)
- Pure & Applied Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Stereophonic System (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US4419670A | 1970-06-08 | 1970-06-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
BE768184A true BE768184A (en) | 1971-12-07 |
Family
ID=21931011
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE768184A BE768184A (en) | 1970-06-08 | 1971-06-07 | QUADRIPHONE RECORDING AND PLAYBACK SYSTEM |
Country Status (7)
Country | Link |
---|---|
US (1) | US3708631A (en) |
JP (1) | JPS5017843B1 (en) |
BE (1) | BE768184A (en) |
CA (1) | CA961417A (en) |
FR (1) | FR2094122B1 (en) |
GB (1) | GB1347994A (en) |
NL (1) | NL7106252A (en) |
Families Citing this family (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3787622A (en) * | 1971-02-05 | 1974-01-22 | Sansui Electric Co | Quadrasonic sound system for two channel transmission |
US3784744A (en) * | 1971-02-24 | 1974-01-08 | Columbia Broadcasting Syst Inc | Decoders for quadruphonic sound utilizing wave matching logic |
US3967063A (en) * | 1971-06-23 | 1976-06-29 | Cbs Inc. | Logic for matrix systems for reproducing quadraphonic sound |
US3830978A (en) * | 1971-07-08 | 1974-08-20 | Matsushita Electric Ind Co Ltd | Circuit for mixing four audio input signals to produce four audio output signals |
JPS5213082B1 (en) * | 1971-07-19 | 1977-04-12 | ||
GB1398786A (en) * | 1971-08-06 | 1975-06-25 | Sony Corp | Multisignal transmission apparatus |
US3794781A (en) * | 1971-09-01 | 1974-02-26 | Columbia Broadcasting Syst Inc | Four channel decoder with improved gain control |
US3824618A (en) * | 1971-10-07 | 1974-07-16 | Pioneer Electronic Corp | Magnetic head and simulated four-channel stereo system |
US3772479A (en) * | 1971-10-19 | 1973-11-13 | Motorola Inc | Gain modified multi-channel audio system |
US3783192A (en) * | 1971-12-30 | 1974-01-01 | Sansui Electric Co | Decoder for use in matrix four-channel system |
JPS5240563B2 (en) * | 1972-03-07 | 1977-10-13 | ||
JPS5228361B2 (en) * | 1972-03-09 | 1977-07-26 | ||
JPS5317283B2 (en) * | 1973-03-07 | 1978-06-07 | ||
GB1522599A (en) * | 1974-11-16 | 1978-08-23 | Dolby Laboratories Inc | Centre channel derivation for stereophonic cinema sound |
US4018992A (en) * | 1975-09-25 | 1977-04-19 | Clifford H. Moulton | Decoder for quadraphonic playback |
US4006306A (en) * | 1975-10-10 | 1977-02-01 | Yudin Industries, Inc. | Audio signal processing apparatus |
US4474441A (en) * | 1980-03-04 | 1984-10-02 | Polaroid Corporation | Method and apparatus for controlling exposure by selective use of blocking visible filter |
US4532647A (en) * | 1981-08-19 | 1985-07-30 | John C. Bogue | Automatic dimension control for a directional enhancement system |
US4525855A (en) * | 1981-08-27 | 1985-06-25 | John C. Bogue | Variable rate and variable limit dimension controls for a directional enhancement system |
US5046098A (en) * | 1985-03-07 | 1991-09-03 | Dolby Laboratories Licensing Corporation | Variable matrix decoder with three output channels |
US4799260A (en) * | 1985-03-07 | 1989-01-17 | Dolby Laboratories Licensing Corporation | Variable matrix decoder |
US5172415A (en) * | 1990-06-08 | 1992-12-15 | Fosgate James W | Surround processor |
US5504819A (en) * | 1990-06-08 | 1996-04-02 | Harman International Industries, Inc. | Surround sound processor with improved control voltage generator |
US5666424A (en) * | 1990-06-08 | 1997-09-09 | Harman International Industries, Inc. | Six-axis surround sound processor with automatic balancing and calibration |
US5339363A (en) * | 1990-06-08 | 1994-08-16 | Fosgate James W | Apparatus for enhancing monophonic audio signals using phase shifters |
US5295189A (en) * | 1990-06-08 | 1994-03-15 | Fosgate James W | Control voltage generator for surround sound processor |
US6925426B1 (en) | 2000-02-22 | 2005-08-02 | Board Of Trustees Operating Michigan State University | Process for high fidelity sound recording and reproduction of musical sound |
GB2514598B (en) * | 2013-05-30 | 2015-04-29 | Egils Ranga | An optimised three speaker stereo sound system |
US20170078793A1 (en) * | 2015-03-23 | 2017-03-16 | Eric Jay Alexander | Inversion Speaker and Headphone for Music Production |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2098561A (en) * | 1934-02-09 | 1937-11-09 | Rca Corp | System for producing stereosonic effects |
US2126929A (en) * | 1936-05-15 | 1938-08-16 | Bell Telephone Labor Inc | Sound reproducing system |
US3184550A (en) * | 1961-06-06 | 1965-05-18 | Admiral Corp | Stereophonic system with derived center channel |
US3632886A (en) * | 1969-12-29 | 1972-01-04 | Peter Scheiber | Quadrasonic sound system |
-
1970
- 1970-06-08 US US00044196A patent/US3708631A/en not_active Expired - Lifetime
-
1971
- 1971-04-28 CA CA111,591A patent/CA961417A/en not_active Expired
- 1971-05-06 NL NL7106252A patent/NL7106252A/xx unknown
- 1971-05-11 JP JP46030898A patent/JPS5017843B1/ja active Pending
- 1971-06-07 BE BE768184A patent/BE768184A/en unknown
- 1971-06-08 GB GB1948871*[A patent/GB1347994A/en not_active Expired
- 1971-06-08 FR FR7120764A patent/FR2094122B1/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US3708631A (en) | 1973-01-02 |
CA961417A (en) | 1975-01-21 |
GB1347994A (en) | 1974-02-27 |
NL7106252A (en) | 1971-12-10 |
JPS5017843B1 (en) | 1975-06-24 |
FR2094122A1 (en) | 1972-02-04 |
DE2126480B2 (en) | 1976-09-30 |
DE2126480A1 (en) | 1972-01-27 |
FR2094122B1 (en) | 1976-12-03 |
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