GB1103648A - Improvements to methods and apparatus for magnetic recording of colour television signals - Google Patents
Improvements to methods and apparatus for magnetic recording of colour television signalsInfo
- Publication number
- GB1103648A GB1103648A GB42954/66A GB4295466A GB1103648A GB 1103648 A GB1103648 A GB 1103648A GB 42954/66 A GB42954/66 A GB 42954/66A GB 4295466 A GB4295466 A GB 4295466A GB 1103648 A GB1103648 A GB 1103648A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- frequency
- signals
- modulated
- colour
- 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
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B9/00—Exposure-making shutters; Diaphragms
- G03B9/70—Exposure-making shutters; Diaphragms with flash-synchronising contacts
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/917—Television signal processing therefor for bandwidth reduction
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/86—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded sequentially and simultaneously, e.g. corresponding to SECAM-system
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Television Signal Processing For Recording (AREA)
- Processing Of Color Television Signals (AREA)
- Networks Using Active Elements (AREA)
Abstract
1,103,648. Colour television. COMPAGNIE FRANCAISE DE TELEVISION. 26 Sept., 1966 [27 Sept., 1965], No. 42954/66. Heading H4F. To magnetically record on a single track a colour television video signal comprising a luminance signal and a sub-carrier frequency modulated by colour signals, e.g. a " SECAM " (Registered Trade Mark) type signal, the video signal is separated into two signals H and L by means of high- and low-pass filters, signal H including at least the modulated sub-carrier and signal L at least the low-frequency components of the luminance signal, and the two signals are combined and passed to a magnetic writing device after signal L has either frequency modulated a wave or has been attenuated to produce a signal L<SP>1</SP>. In the embodiments described signal L extends from 0 to 2 Mc/s. and signal H from 3.5 to 5.5 Mc/s., the video signal comprising a 5À5 Mc/s. luminance signal and a colour subcarrier extending from 3.5 to 4.8 Mc/s. In the embodiment in which signal L<SP>1</SP> comprises a wave frequency-modulated by signal L, the frequency band of signal L<SP>1</SP> comprises 0À2 Mc/s. to 3.3 Mc/s., the frequency modulating means including an output filter. The output of the magnetic recording device is passed to two filters having pass-bands corresponding to signals H and L<SP>1</SP> and the two resulting signals are combined after signal L<SP>1</SP> has been frequency demodulated. Since the reproduced luminance signal has suffered a loss of definition the output signal of the frequency demodulator may be crispened through differentiation of the signal. If the sub-carrier in the input video signal was submitted to a filtering in a coding filter the high-pass filters preferably include a decoding and a coding filter. In the second embodiment in which signal L<SP>1</SP> comprises an attenuated signal L, the subcarrier included in signal H acts as an auxiliary high-frequency bias oscillation, since as is known one method of recording low-frequency components comprises adding to this signal a bias sinusoidal voltage. Instead of attenuating signal L signal H may be amplified. The circuits preferably include a band rejection filter for the frequency band separating the bands of signals L and H.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR32811A FR1458541A (en) | 1965-09-27 | 1965-09-27 | Improvements in methods and devices for magnetic recording of color television signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1103648A true GB1103648A (en) | 1968-02-21 |
Family
ID=8589163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB42954/66A Expired GB1103648A (en) | 1965-09-27 | 1966-09-26 | Improvements to methods and apparatus for magnetic recording of colour television signals |
Country Status (15)
| Country | Link |
|---|---|
| BE (1) | BE687182A (en) |
| CH (1) | CH453423A (en) |
| DE (1) | DE1462493B2 (en) |
| DK (1) | DK124298B (en) |
| ES (1) | ES331632A1 (en) |
| FI (1) | FI52007C (en) |
| FR (2) | FR1458541A (en) |
| GB (1) | GB1103648A (en) |
| IL (1) | IL26583A (en) |
| LU (1) | LU52024A1 (en) |
| MC (1) | MC620A1 (en) |
| NL (1) | NL6613375A (en) |
| NO (1) | NO119027B (en) |
| OA (1) | OA02262A (en) |
| SE (1) | SE346444B (en) |
-
1965
- 1965-09-27 FR FR32811A patent/FR1458541A/en not_active Expired
- 1965-11-08 FR FR37631A patent/FR1462493A/en not_active Expired
-
1966
- 1966-09-20 DE DE1966C0040138 patent/DE1462493B2/en active Granted
- 1966-09-20 OA OA52603A patent/OA02262A/en unknown
- 1966-09-21 BE BE687182D patent/BE687182A/xx not_active IP Right Cessation
- 1966-09-22 MC MC649A patent/MC620A1/en unknown
- 1966-09-22 NL NL6613375A patent/NL6613375A/xx unknown
- 1966-09-23 LU LU52024A patent/LU52024A1/xx unknown
- 1966-09-26 GB GB42954/66A patent/GB1103648A/en not_active Expired
- 1966-09-26 IL IL26583A patent/IL26583A/en unknown
- 1966-09-26 CH CH1385866A patent/CH453423A/en unknown
- 1966-09-26 NO NO164902A patent/NO119027B/no unknown
- 1966-09-26 DK DK499066AA patent/DK124298B/en unknown
- 1966-09-26 SE SE12930/66A patent/SE346444B/xx unknown
- 1966-09-27 FI FI662525A patent/FI52007C/en active
- 1966-09-27 ES ES0331632A patent/ES331632A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE1462493A1 (en) | 1968-12-12 |
| IL26583A (en) | 1970-11-30 |
| OA02262A (en) | 1970-05-05 |
| NO119027B (en) | 1970-03-16 |
| DE1462493B2 (en) | 1977-06-23 |
| NL6613375A (en) | 1967-03-28 |
| SE346444B (en) | 1972-07-03 |
| MC620A1 (en) | 1967-05-31 |
| CH453423A (en) | 1968-06-14 |
| DK124298B (en) | 1972-10-02 |
| FR1458541A (en) | 1966-03-04 |
| BE687182A (en) | 1967-03-01 |
| FI52007C (en) | 1977-05-10 |
| ES331632A1 (en) | 1967-11-16 |
| FI52007B (en) | 1977-01-31 |
| LU52024A1 (en) | 1966-11-23 |
| FR1462493A (en) | 1966-04-15 |
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