GB1362413A - Decoding method and apparatus - Google Patents
Decoding method and apparatusInfo
- Publication number
- GB1362413A GB1362413A GB4249271A GB4249271A GB1362413A GB 1362413 A GB1362413 A GB 1362413A GB 4249271 A GB4249271 A GB 4249271A GB 4249271 A GB4249271 A GB 4249271A GB 1362413 A GB1362413 A GB 1362413A
- Authority
- GB
- United Kingdom
- Prior art keywords
- matrix
- constants
- signals
- fed
- encode
- 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
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)
- Stereo-Broadcasting Methods (AREA)
Abstract
1362413 Stereophonic systems INDUSTRIAL PATENT DEVELOPMENT CORP 13 Sept 1971 [13 Oct 1970 21 May 1971] 42492/71 Heading H4R In a decoder for a stereophonic system in which four signals Lf, Lr, Rf, Rr, are fed on to two channels by a matrix which provides the channel signals L<SP>1</SP> and R<SP>1</SP> where L<SP>1</SP>=K 1 (L f + XRf+Lr-WRr) and R<SP>1</SP>=K 2 (Bf+XLf+ Rr-WLr), K 1 , K 2 , X and W, are constants and X and W are between 0 and 1, the channel signals L<SP>1</SP> and R<SP>1</SP> are fed to a matrix which produces four signals where Y and Z are constants between 0 and 1. Fig. 1 shows a matrix which is switchable between the encode and decode functions, being in the encode state in Fig. 1 and the decode state in Fig. 2 (not shown). The matrix includes amplifiers 20, 22, 24, 26 which introduce no phase change and amplifiers 28 and 30 which are phase reversing. Resistors 40, 42, 60 and 62 provide for adjustment of the constants W, X, Y and Z.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US8037170A | 1970-10-13 | 1970-10-13 | |
| US14581371A | 1971-05-21 | 1971-05-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1362413A true GB1362413A (en) | 1974-08-07 |
Family
ID=26763430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4249271A Expired GB1362413A (en) | 1970-10-13 | 1971-09-13 | Decoding method and apparatus |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE2150168A1 (en) |
| GB (1) | GB1362413A (en) |
-
1971
- 1971-09-13 GB GB4249271A patent/GB1362413A/en not_active Expired
- 1971-10-07 DE DE19712150168 patent/DE2150168A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE2150168A1 (en) | 1972-04-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |