CA2527157A1 - Multichannel quadrature modulation compatible with standard television channel plans - Google Patents
Multichannel quadrature modulation compatible with standard television channel plans Download PDFInfo
- Publication number
- CA2527157A1 CA2527157A1 CA002527157A CA2527157A CA2527157A1 CA 2527157 A1 CA2527157 A1 CA 2527157A1 CA 002527157 A CA002527157 A CA 002527157A CA 2527157 A CA2527157 A CA 2527157A CA 2527157 A1 CA2527157 A1 CA 2527157A1
- Authority
- CA
- Canada
- Prior art keywords
- signals
- television channel
- standard television
- quadrature modulation
- multichannel
- 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.)
- Granted
Links
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
A method and apparatus for modulating both quadrature components of each of a plurality of RF signals comprising a multichannel signal compatible with standard television frequency plans is disclosed. By employing certain digital signal processing techniques, a pair of composite baseband signals are produced in manner that is uniquely associated with the modulation content of the RF signals. According to one aspect of the invention, by using the composite baseband signals to modulate in quadrature a single quadrature modulator, the composite baseband signals are shown to have a baseband frequency span that is substantially half of the frequency range spanned by the multichannel signal. An application for the CATV field in which a 6 MHz television channel spacing between the RF signals is also disclosed.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US81875292A | 1992-01-08 | 1992-01-08 | |
| US07/818,752 | 1992-01-08 | ||
| CA002127686A CA2127686C (en) | 1992-01-08 | 1993-01-07 | Multichannel digital signal generation method and apparatus |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002127686A Division CA2127686C (en) | 1992-01-08 | 1993-01-07 | Multichannel digital signal generation method and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2527157A1 true CA2527157A1 (en) | 1993-07-22 |
| CA2527157C CA2527157C (en) | 2008-07-29 |
Family
ID=35696246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002527157A Expired - Fee Related CA2527157C (en) | 1992-01-08 | 1993-01-07 | Multichannel quadrature modulation compatible with standard television channel plans |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2527157C (en) |
-
1993
- 1993-01-07 CA CA002527157A patent/CA2527157C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2527157C (en) | 2008-07-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed | ||
| MKLA | Lapsed |
Effective date: 20110107 |