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SG8494G - Videorecorder with equalizing circuit - Google Patents

Videorecorder with equalizing circuit

Info

Publication number
SG8494G
SG8494G SG8494A SG8494A SG8494G SG 8494 G SG8494 G SG 8494G SG 8494 A SG8494 A SG 8494A SG 8494 A SG8494 A SG 8494A SG 8494 G SG8494 G SG 8494G
Authority
SG
Singapore
Prior art keywords
mode
luminance signals
switching level
oscillations
whenever
Prior art date
Application number
SG8494A
Inventor
Gerd Reime
Original Assignee
Nokia Deutschland Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to DE4035309A priority Critical patent/DE4035309A1/en
Priority to DE91110743T priority patent/DE59100587D1/en
Priority to ES91110743T priority patent/ES2049503T3/en
Priority to AT91110743T priority patent/ATE97287T1/en
Priority to EP91110743A priority patent/EP0484631B1/en
Priority to DK91110743.1T priority patent/DK0484631T3/en
Priority to JP3194339A priority patent/JP2693060B2/en
Priority to IS3758A priority patent/IS3758A7/en
Priority to CA002052986A priority patent/CA2052986C/en
Priority to MX9101799A priority patent/MX9101799A/en
Priority to HU913428A priority patent/HU211179B/en
Priority to NO91914312A priority patent/NO914312L/en
Priority to FI915192A priority patent/FI915192A/en
Priority to CS913342A priority patent/CS334291A3/en
Priority to PT99438A priority patent/PT99438B/en
Priority to BR919104833A priority patent/BR9104833A/en
Priority to IE386891A priority patent/IE65895B1/en
Priority to PL29229591A priority patent/PL292295A1/en
Priority to KR1019910019648A priority patent/KR0144849B1/en
Application filed by Nokia Deutschland Gmbh filed Critical Nokia Deutschland Gmbh
Priority to SG8494A priority patent/SG8494G/en
Priority to HK218/94A priority patent/HK21894A/en
Publication of SG8494G publication Critical patent/SG8494G/en

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>
SG8494A 1990-11-07 1994-01-19 Videorecorder with equalizing circuit SG8494G (en)

Priority Applications (21)

Application Number Priority Date Filing Date Title
DE4035309A DE4035309A1 (en) 1990-11-07 1990-11-07 VIDEO RECORDER WITH AN EQUALIZER
DE91110743T DE59100587D1 (en) 1990-11-07 1991-06-28 VCR with an equalizer circuit.
ES91110743T ES2049503T3 (en) 1990-11-07 1991-06-28 VIDEO RECORDING DEVICE WITH A CORRECTOR CIRCUIT.
AT91110743T ATE97287T1 (en) 1990-11-07 1991-06-28 VIDEO RECORDER WITH AN EQUALIZATION CIRCUIT.
EP91110743A EP0484631B1 (en) 1990-11-07 1991-06-28 Videorecorder with equalizing circuit
DK91110743.1T DK0484631T3 (en) 1990-11-07 1991-06-28 Video recorder with a counter-distortion circuit
JP3194339A JP2693060B2 (en) 1990-11-07 1991-08-02 Video recorder with distortion correction circuit
IS3758A IS3758A7 (en) 1990-11-07 1991-09-27 Video recorder with debugging circuit
CA002052986A CA2052986C (en) 1990-11-07 1991-10-08 Video recorder with distortion corrector circuit
MX9101799A MX9101799A (en) 1990-11-07 1991-10-28 VIDEO RECORDER WITH DISTORTION CORRECTOR CIRCUIT
HU913428A HU211179B (en) 1990-11-07 1991-10-31 Method and circuit arrangement for reducing distortions of the frequency-modulated luminance signal of a video recorder
NO91914312A NO914312L (en) 1990-11-07 1991-11-04 VIDEO PLAYER INCLUDING A DISTORTION CORRECTION CIRCUIT
FI915192A FI915192A (en) 1990-11-07 1991-11-04 VIDEOBANDSPELARE MED FOERVRAENGNINGSKORRIGERINGSKRETS.
CS913342A CS334291A3 (en) 1990-11-07 1991-11-05 Video recorder with a distortion equalizing circuit
BR919104833A BR9104833A (en) 1990-11-07 1991-11-06 VIDEO RECORDER WITH AN ANTI-DISTORTION CIRCUIT
PT99438A PT99438B (en) 1990-11-07 1991-11-06 VIDEO RECORDER WITH DISTORTION CORRECTOR CIRCUIT
IE386891A IE65895B1 (en) 1990-11-07 1991-11-06 Video recorder with distortion corrector circuit
PL29229591A PL292295A1 (en) 1990-11-07 1991-11-06 Video recorder with interference correction circuitry
KR1019910019648A KR0144849B1 (en) 1990-11-07 1991-11-06 Video recorder with distortion correction circuit
SG8494A SG8494G (en) 1990-11-07 1994-01-19 Videorecorder with equalizing circuit
HK218/94A HK21894A (en) 1990-11-07 1994-03-10 Videorecorder with equalizing circuit

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
SG8494G true SG8494G (en) 1994-04-15

Family

ID=25898302

Family Applications (1)

Application Number Title Priority Date Filing Date
SG8494A SG8494G (en) 1990-11-07 1994-01-19 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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

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
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
HK21894A (en) 1994-03-18
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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