GB1414260A - Process and apparatus for quadraphonic transmission - Google Patents
Process and apparatus for quadraphonic transmissionInfo
- Publication number
- GB1414260A GB1414260A GB784873A GB784873A GB1414260A GB 1414260 A GB1414260 A GB 1414260A GB 784873 A GB784873 A GB 784873A GB 784873 A GB784873 A GB 784873A GB 1414260 A GB1414260 A GB 1414260A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signals
- khz
- transmission
- microphones
- turns
- 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
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/86—Arrangements characterised by the broadcast information itself
- H04H20/88—Stereophonic broadcast systems
- H04H20/89—Stereophonic broadcast systems using three or more audio channels, e.g. triphonic or quadraphonic
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Computer Networks & Wireless Communication (AREA)
- Stereo-Broadcasting Methods (AREA)
- Stereophonic System (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
1414260 Quadraphonic transmission ELEKTROMEOHANIKAI VALLALAT 16 Feb 1973 [28 Dec 1972] 7848/73 Heading H4L Signals 1, 2, 3, 4 from a rectangular array of microphones 1-4 are coded and transmitted (for example, in frequency multiplex) to four loudspeakers 8, 9, 10, 11 respectively receiving them as double signals 1+2, 2+3, 3+4 and 4+1. The rectangular array of speakers is turned through 45 degrees relative to the microphone array in order to reproduce from virtual sources 12, 13, 14, 15 a sound pattern which is identical to, and has the same orientation as, that sensed by the microphones. A coder 5 turns the four microphone signals into three composite signals, the first being a sum of all four (1+2+3+4), the second and third being the diagonal differences (1-3, 2-4). A main channel of 30 Hz to 15 kHz (1, Fig. 2, not shown) carries the sum signal, and quadrature subcarriers (4) centred on 38 kHz carry the other two signals. Pilots at 19 kHz and 38 kHz are included, the latter to operate stereoquadraphonic mode switching circuits at the receiver. The transmission link 6 is radio or line. The decoder 7 turns the three composite signals into the four loud-speaker signals in an unspecified manner.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| HUEE002080 HU165189B (en) | 1972-12-28 | 1972-12-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1414260A true GB1414260A (en) | 1975-11-19 |
Family
ID=10995470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB784873A Expired GB1414260A (en) | 1972-12-28 | 1973-02-16 | Process and apparatus for quadraphonic transmission |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS4998601A (en) |
| AT (1) | AT335515B (en) |
| CS (1) | CS177118B2 (en) |
| DE (1) | DE2307418A1 (en) |
| FR (1) | FR2212717A1 (en) |
| GB (1) | GB1414260A (en) |
| HU (1) | HU165189B (en) |
| IT (1) | IT1009023B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2310672A1 (en) * | 1975-05-07 | 1976-12-03 | Emv Elektromechanikai Vallalat | Quadrphonic sound equipment using dual composite signals - has four loudspeakers receiving dual compositie signals to produce phantom sound sources |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2218822C3 (en) * | 1971-04-15 | 1980-10-16 | Matsushita Electric Industrial Co Ltd., Kadoma, Osaka (Japan) | Four channel FM transmission system |
| 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 |
-
1972
- 1972-12-28 HU HUEE002080 patent/HU165189B/hu unknown
-
1973
- 1973-02-15 DE DE19732307418 patent/DE2307418A1/en active Pending
- 1973-02-16 GB GB784873A patent/GB1414260A/en not_active Expired
- 1973-02-16 CS CS114873A patent/CS177118B2/cs unknown
- 1973-02-16 AT AT138273A patent/AT335515B/en not_active IP Right Cessation
- 1973-03-09 JP JP48027920A patent/JPS4998601A/ja active Pending
- 1973-03-20 IT IT6778673A patent/IT1009023B/en active
- 1973-05-22 FR FR7318628A patent/FR2212717A1/fr not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| HU165189B (en) | 1974-07-27 |
| FR2212717A1 (en) | 1974-07-26 |
| ATA138273A (en) | 1976-07-15 |
| AT335515B (en) | 1977-03-10 |
| JPS4998601A (en) | 1974-09-18 |
| DE2307418A1 (en) | 1974-07-11 |
| IT1009023B (en) | 1976-12-10 |
| CS177118B2 (en) | 1977-07-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |