GB1414166A - Quadraphonic sound transmission or recording system - Google Patents
Quadraphonic sound transmission or recording systemInfo
- Publication number
- GB1414166A GB1414166A GB3546772A GB3546772A GB1414166A GB 1414166 A GB1414166 A GB 1414166A GB 3546772 A GB3546772 A GB 3546772A GB 3546772 A GB3546772 A GB 3546772A GB 1414166 A GB1414166 A GB 1414166A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signals
- sum
- signal
- difference
- microphones
- 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
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R5/00—Stereophonic arrangements
- H04R5/027—Spatial or constructional arrangements of microphones, e.g. in dummy heads
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Algebra (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Mathematical Physics (AREA)
- Pure & Applied Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Abstract
1414166 Quadraphonic systems BRITISH BROADCASTING CORP 4 July 1973 [28 July 1972] 35467/72 Heading H4R A quadraphonic system operates with a three channel transmission signal, one of the signals being an omnidirection sum signal and the other two signals being signals dependent on the position of a sound source with repect to respective different axes. The signals may be derived from two pairs of microphones, each microphone having a cardioid directional characteristic Fig. 2, with the sum signals from each pair providing the omnidirection signal, either by taking one only of the sum signals, or by averaging the sum signals, the other two signals being derived from the difference of the signals of the microphones in each pair. Alternatively a single omnidirectional microphone can provide the omnidirectional sum signal and two microphones having "figure of eight" characteristics with the axes at right angles, one to the other, can provide the other two signals. For reproduction the omnidirectional signal is combined with each of the other signals in sum and difference to provide four output signals. For transmission by broadcast the two difference signals can modulate quadrature carriers transmitted with the sum signal to provide a signal which is compatible with the conventional stereo broadcasts. On reproduction the ratio of the sum to the difference signal can be modified to vary the apparent sound stage size.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3546772A GB1414166A (en) | 1972-07-28 | 1972-07-28 | Quadraphonic sound transmission or recording system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3546772A GB1414166A (en) | 1972-07-28 | 1972-07-28 | Quadraphonic sound transmission or recording system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1414166A true GB1414166A (en) | 1975-11-19 |
Family
ID=10378056
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3546772A Expired GB1414166A (en) | 1972-07-28 | 1972-07-28 | Quadraphonic sound transmission or recording system |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1414166A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2345047A1 (en) * | 1976-03-15 | 1977-10-14 | Nat Res Dev | SOUND REPRODUCTION SYSTEMS |
US4262170A (en) * | 1979-03-12 | 1981-04-14 | Bauer Benjamin B | Microphone system for producing signals for surround-sound transmission and reproduction |
-
1972
- 1972-07-28 GB GB3546772A patent/GB1414166A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2345047A1 (en) * | 1976-03-15 | 1977-10-14 | Nat Res Dev | SOUND REPRODUCTION SYSTEMS |
US4262170A (en) * | 1979-03-12 | 1981-04-14 | Bauer Benjamin B | Microphone system for producing signals for surround-sound transmission and reproduction |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |