HK21894A - Videorecorder with equalizing circuit - Google Patents
Videorecorder with equalizing circuitInfo
- Publication number
- HK21894A HK21894A HK218/94A HK21894A HK21894A HK 21894 A HK21894 A HK 21894A HK 218/94 A HK218/94 A HK 218/94A HK 21894 A HK21894 A HK 21894A HK 21894 A HK21894 A HK 21894A
- Authority
- HK
- Hong Kong
- Prior art keywords
- mode
- luminance signals
- switching level
- oscillations
- whenever
- Prior art date
Links
Classifications
-
- 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
- H04N5/93—Regeneration of the television signal or of selected parts thereof
-
- 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
- H04N5/92—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
-
- 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
- H04N5/93—Regeneration of the television signal or of selected parts thereof
- H04N5/931—Regeneration of the television signal or of selected parts thereof for restoring the level of the reproduced signal
- H04N5/9315—Regeneration of the television signal or of selected parts thereof for restoring the level of the reproduced signal the level control being frequency dependent
Landscapes
- Multimedia (AREA)
- Signal Processing (AREA)
- Engineering & Computer Science (AREA)
- Television Signal Processing For Recording (AREA)
- Picture Signal Circuits (AREA)
- Networks Using Active Elements (AREA)
- Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
- Debugging And Monitoring (AREA)
- Facsimile Image Signal Circuits (AREA)
- Macromonomer-Based Addition Polymer (AREA)
- Polyoxymethylene Polymers And Polymers With Carbon-To-Carbon Bonds (AREA)
- Television Systems (AREA)
Abstract
In the signal path (1) for the frequency-modulated luminance signal of a video recorder, an equalising circuit (11) is disposed between the video band (2) and the frequency demodulator (3) which, whenever the luminance signals fall below a specific switching level (U16), operates in the mode of a bandpass filter (19) which is tuned to the carrier frequencies of the luminance signals and, whenever the luminance signals exceed this switching level in the direction of higher values, operates in the mode of an amplitude-controlled delay unit. In the latter mode, phase errors caused by recording and transmission are largely cancelled, whereas, in the former mode, oscillation patterns with deteriorated oscillations are again refreshed in terms of amplitude through the resonance effect. The height of switching level (U16) is set by a noise detection circuit (21) which detects the rate of the oscillations which do not pass through a specific detection level of the noise detection circuit situated in the vicinity of the sound point line of the frequency demodulator. The equalising circuit is thereby adapted to the different reproduction quality levels of different video tapes in such a way that image reproduction with minimum interference and maximum definition is achieved. <IMAGE>
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4035309A DE4035309A1 (en) | 1990-11-07 | 1990-11-07 | VIDEO RECORDER WITH AN EQUALIZER |
| SG8494A SG8494G (en) | 1990-11-07 | 1994-01-19 | Videorecorder with equalizing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| HK21894A true HK21894A (en) | 1994-03-18 |
Family
ID=25898302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| HK218/94A HK21894A (en) | 1990-11-07 | 1994-03-10 | Videorecorder with equalizing circuit |
Country Status (20)
| Country | Link |
|---|---|
| EP (1) | EP0484631B1 (en) |
| JP (1) | JP2693060B2 (en) |
| KR (1) | KR0144849B1 (en) |
| AT (1) | ATE97287T1 (en) |
| BR (1) | BR9104833A (en) |
| CA (1) | CA2052986C (en) |
| CS (1) | CS334291A3 (en) |
| DE (2) | DE4035309A1 (en) |
| DK (1) | DK0484631T3 (en) |
| ES (1) | ES2049503T3 (en) |
| FI (1) | FI915192A (en) |
| HK (1) | HK21894A (en) |
| HU (1) | HU211179B (en) |
| IE (1) | IE65895B1 (en) |
| IS (1) | IS3758A7 (en) |
| MX (1) | MX9101799A (en) |
| NO (1) | NO914312L (en) |
| PL (1) | PL292295A1 (en) |
| PT (1) | PT99438B (en) |
| SG (1) | SG8494G (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR960009146B1 (en) * | 1993-12-29 | 1996-07-13 | Daewoo Electronics Co Ltd | Reservation recording control method of video tape recorder |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT346099B (en) * | 1976-08-05 | 1978-10-25 | Philips Nv | PLAYBACK DEVICE |
| JP2604697B2 (en) * | 1984-04-12 | 1997-04-30 | ソニー株式会社 | FM demodulation circuit |
| DE3516913C1 (en) * | 1985-05-10 | 1986-10-02 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Automatic FM sideband level control for video recorders |
| DE3539816A1 (en) * | 1985-11-09 | 1987-05-21 | Standard Elektrik Lorenz Ag | Filter circuit for influencing the resolution of a video recording luminance signal reproduced on a screen |
| DE3809394A1 (en) * | 1987-04-18 | 1989-10-12 | Graetz Nokia Gmbh | Video device with an equalizer circuit in the signal path for the frequency-modulated signals |
| DE3915454A1 (en) * | 1988-05-12 | 1989-12-07 | Mitsubishi Electric Corp | INVERSION PHENOMEN CANCELING |
| JPH0810533B2 (en) * | 1988-10-20 | 1996-01-31 | 日本ビクター株式会社 | Magnetic playback device |
-
1990
- 1990-11-07 DE DE4035309A patent/DE4035309A1/en active Granted
-
1991
- 1991-06-28 DE DE91110743T patent/DE59100587D1/en not_active Expired - Fee Related
- 1991-06-28 EP EP91110743A patent/EP0484631B1/en not_active Expired - Lifetime
- 1991-06-28 AT AT91110743T patent/ATE97287T1/en not_active IP Right Cessation
- 1991-06-28 DK DK91110743.1T patent/DK0484631T3/en active
- 1991-06-28 ES ES91110743T patent/ES2049503T3/en not_active Expired - Lifetime
- 1991-08-02 JP JP3194339A patent/JP2693060B2/en not_active Expired - Fee Related
- 1991-09-27 IS IS3758A patent/IS3758A7/en unknown
- 1991-10-08 CA CA002052986A patent/CA2052986C/en not_active Expired - Fee Related
- 1991-10-28 MX MX9101799A patent/MX9101799A/en unknown
- 1991-10-31 HU HU913428A patent/HU211179B/en not_active IP Right Cessation
- 1991-11-04 FI FI915192A patent/FI915192A/en not_active Application Discontinuation
- 1991-11-04 NO NO91914312A patent/NO914312L/en unknown
- 1991-11-05 CS CS913342A patent/CS334291A3/en unknown
- 1991-11-06 KR KR1019910019648A patent/KR0144849B1/en not_active IP Right Cessation
- 1991-11-06 BR BR919104833A patent/BR9104833A/en unknown
- 1991-11-06 IE IE386891A patent/IE65895B1/en not_active IP Right Cessation
- 1991-11-06 PL PL29229591A patent/PL292295A1/en unknown
- 1991-11-06 PT PT99438A patent/PT99438B/en not_active IP Right Cessation
-
1994
- 1994-01-19 SG SG8494A patent/SG8494G/en unknown
- 1994-03-10 HK HK218/94A patent/HK21894A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| NO914312L (en) | 1992-05-08 |
| EP0484631B1 (en) | 1993-11-10 |
| FI915192A0 (en) | 1991-11-04 |
| EP0484631A3 (en) | 1992-11-25 |
| PT99438B (en) | 1999-02-26 |
| BR9104833A (en) | 1992-06-23 |
| IE913868A1 (en) | 1992-05-20 |
| JPH04273680A (en) | 1992-09-29 |
| MX9101799A (en) | 1992-07-08 |
| SG8494G (en) | 1994-04-15 |
| PT99438A (en) | 1994-02-28 |
| CA2052986C (en) | 2000-08-08 |
| IE65895B1 (en) | 1995-11-29 |
| FI915192A (en) | 1992-05-08 |
| HU211179B (en) | 1995-11-28 |
| JP2693060B2 (en) | 1997-12-17 |
| HUT62129A (en) | 1993-03-29 |
| ATE97287T1 (en) | 1993-11-15 |
| CS334291A3 (en) | 1992-05-13 |
| KR0144849B1 (en) | 1998-07-15 |
| NO914312D0 (en) | 1991-11-04 |
| PL292295A1 (en) | 1992-08-10 |
| DE59100587D1 (en) | 1993-12-16 |
| KR920011229A (en) | 1992-06-27 |
| HU913428D0 (en) | 1992-02-28 |
| DE4035309C2 (en) | 1993-08-05 |
| IS3758A7 (en) | 1992-05-08 |
| EP0484631A2 (en) | 1992-05-13 |
| DE4035309A1 (en) | 1992-05-14 |
| ES2049503T3 (en) | 1994-04-16 |
| DK0484631T3 (en) | 1994-01-03 |
| CA2052986A1 (en) | 1992-05-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PC | Patent ceased (i.e. patent has lapsed due to the failure to pay the renewal fee) |