MAGNETIC RECORDING AND METHOD FOR CONTROLLING INCLINE OF ROTARY MAGNETIC DRUM

• Main Author: MIZUTANI, YOSHIO
• Format: Patent
• Language: English; Korean
• Published: 15.01.2000
• Edition: 7
• Subjects: INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; PHYSICS

본 발명은 소위 자기기록 재생이든 호환 재생이든 불문하고, 경년변화의 영향을 받지 않고 기록시 트랙패턴과 재생시 자기헤드의 트레이스 패턴을 가능한 일치시켜, 재생화면중의 노이즈 발생을 방지한다. 재생신호 진폭의 소정시간에 걸친 평탄도를 검출하고, 평탄도가 최상의 상태가 되도록 회전드럼의 경사각을 제어하도록 되어있다. 또한 재생신호의 레벨을 검출하여 레벨이 최상의 상태가 되도록 테이프 주행속도를 제어하며, 재생속도의 변화가 있을때는 변화후의 재생속도에 적합한 회전드럼의 경사각이 이미 이전의 제어로 견출되어 기억되어 있는가의 여부를 판단하고, 기억되어 있는 경우는 그 테렌를 판독하여 회전드럼의 경사각 제어를 행하는 양호한 형상으로 구성된다. An envelope is detected from each of a plurality of reproduced video FM signals successively read out from a magnetic tape, and a shape change of the envelope in one vertical scanning period is detected in a control microcomputer. In cases where the shape of the envelope is flattened, the flatness indicates that an inclination angle of a rotational drum is appropriately set and a scanning locus of a magnetic head attached on the rotational drum agrees with a track formed on the magnetic tape. In this case, a reproduced image having no noise is obtained. Therefore, the number of increase/decrease changes in the shape of the envelope is detected as a shape value. In cases where the shape value is high, the inclination angle of the rotational drum is largely and repeatedly changed until the shape value becomes low. In contrast, in cases where the shape value is low, the inclination angle of the rotational drum is slightly and repeatedly changed until the envelope shape is flattened. Accordingly, any noise does not occur in the reproduced image regardless of whether a magnetic recording and reproducing apparatus is used in interchangeable reproduction or self-recording/reproduction.