JPS57160274A - Correction circuit for pincushion distortion - Google Patents

Correction circuit for pincushion distortion

Info

Publication number
JPS57160274A
JPS57160274A JP4562081A JP4562081A JPS57160274A JP S57160274 A JPS57160274 A JP S57160274A JP 4562081 A JP4562081 A JP 4562081A JP 4562081 A JP4562081 A JP 4562081A JP S57160274 A JPS57160274 A JP S57160274A
Authority
JP
Japan
Prior art keywords
circuit
compensating
pincushion distortion
distortion
pincushion
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.)
Pending
Application number
JP4562081A
Other languages
Japanese (ja)
Inventor
Toshiaki Terakawa
Tsugihiko Kobayashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP4562081A priority Critical patent/JPS57160274A/en
Publication of JPS57160274A publication Critical patent/JPS57160274A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/22—Circuits for controlling dimensions, shape or centering of picture on screen
    • H04N3/23—Distortion correction, e.g. for pincushion distortion correction, S-correction
    • H04N3/233—Distortion correction, e.g. for pincushion distortion correction, S-correction using active elements
    • H04N3/2335—Distortion correction, e.g. for pincushion distortion correction, S-correction using active elements with calculating means

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Details Of Television Scanning (AREA)

Abstract

PURPOSE:To eliminate virtually the pincushion distortion and to improve the reliability of a distortion compensating circuit, by storing previously the compensating circuit, by storing previously the compensating information of the pincushion distortion in a digital memory and producing a compensating signal based on th correcting information to obtain an optional correction waveform. CONSTITUTION:The correcting information based on which a pincushion correction signal is digitally stored in a digital memory 40 and then read out to a D/A converter 41 to be converted into an analog value. Thus the parabola voltage VP is produced. The voltage VP is set at a value obtained by carrying out the sampling to the frequency of a horizontal synchronizing signal and then applied to a multiplying or modulating circuit 22 to be superposed on the vertical sawtooth wave voltage VS applied to the circuit 22. Then the current ID flowing to a vertical deflecting coil 20 is modulated with an optional correcting waveform and through the circuit 22. Thus the pincushion distortion can be virtually eliminated.
JP4562081A 1981-03-30 1981-03-30 Correction circuit for pincushion distortion Pending JPS57160274A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4562081A JPS57160274A (en) 1981-03-30 1981-03-30 Correction circuit for pincushion distortion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4562081A JPS57160274A (en) 1981-03-30 1981-03-30 Correction circuit for pincushion distortion

Publications (1)

Publication Number Publication Date
JPS57160274A true JPS57160274A (en) 1982-10-02

Family

ID=12724414

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4562081A Pending JPS57160274A (en) 1981-03-30 1981-03-30 Correction circuit for pincushion distortion

Country Status (1)

Country Link
JP (1) JPS57160274A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60236380A (en) * 1984-05-09 1985-11-25 Hitachi Ltd Focus correcting device of cathode-ray tube
JPS60256275A (en) * 1984-05-23 1985-12-17 ドイチエ・アイテイーテイー・インダストリーズ・ゲゼルシヤフト・ミト・ベシユレンクタ・ハフツンク Method of correcting digital deflection of television receiver and correcting circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5578688A (en) * 1978-12-07 1980-06-13 Sony Corp Right-left pincushion distortion corrector for beam index type color television picture receiver

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5578688A (en) * 1978-12-07 1980-06-13 Sony Corp Right-left pincushion distortion corrector for beam index type color television picture receiver

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60236380A (en) * 1984-05-09 1985-11-25 Hitachi Ltd Focus correcting device of cathode-ray tube
JPS60256275A (en) * 1984-05-23 1985-12-17 ドイチエ・アイテイーテイー・インダストリーズ・ゲゼルシヤフト・ミト・ベシユレンクタ・ハフツンク Method of correcting digital deflection of television receiver and correcting circuit

Similar Documents

Publication Publication Date Title
NO943189L (en) Demodulator for consumer applications
JPS5578690A (en) Horizontal linearity corrector for beam index type color television picture receiver
ES456982A1 (en) Signal processor for switched vertical deflection system
JPS57160274A (en) Correction circuit for pincushion distortion
CA2196819A1 (en) Digital fm demodulator
JPS6423685A (en) Horizontal deflecting output circuit
US3637920A (en) Method and system for correcting color errors in the television-scanning of color films
JPS5710593A (en) Convergence circuit
ES441301A1 (en) Deflection waveform correction signal generator
GB1386231A (en) Waveform correction for resonant recovery deflection systems
JPS572166A (en) Distortion correcting circuit of pickup tube or the like
KR880012078A (en) TV deflection TV deflection
CA2040252A1 (en) Parabolic voltage generating circuit
DE3785473D1 (en) PILLOW DISTORTION CORRECTION IN DISTRIBUTION.
JPS5637773A (en) Video special effect generator
ATE55667T1 (en) DEFLECTION CIRCUIT FOR FLAT SQUARE CRT WITH CORRECTED SEAGULL WING-SHAPED DISTORTION.
JPS5884570A (en) Horizontal deflecting circuit
JPS59180530U (en) Sawtooth wave generation circuit
JPS56119577A (en) Vertical deflecting circuit
JPS6022698Y2 (en) Pink tension distortion correction circuit
JPS55112077A (en) Automatic display distortion correcting device
JPS5969576U (en) Convergence correction device
JPH0143749Y2 (en)
JPS5668875A (en) Binary system
JPS56120267A (en) Corrector for horizontal linearity