Servo control apparatus and method for video cassette tape recorder
AssigneeLG Electronics Inc.
InventorYoung Gyo Oh
Life of this patent
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Abstract
An improved servo control device and method for a VCR that minimizes jitter caused in a reproducing mode of the VCR (reproducing VCR) when it reproduces a video signal recorded by another VCR (recording VCR). A recording characteristic of the recording VCR (such as a duty interval of horizontal synchronous signals contained in the video signal) is used along with one or more reproducing characteristics (such as speed and phase) of the reproducing VCR to control a rotation speed of the reproducing VCR's drum motor.
Claims22
A servo control apparatus for a motor in a magnetic tape recording and reproducing apparatus comprising:
- reproducing means for reproducing a signal from said magnetic tape;
- a rotation sensor sensing rotation of said motor;
- a phase sensor sensing a phase of said motor;
- speed driving signal generating means for generating a speed driving signal based on output from said rotation sensor;
- phase driving signal generating means for generating a phase driving signal based on output from said phase sensor;
- synchronizing signal generating means for receiving said reproduction signal, determining a duty interval of synchronous pulses in said reproduction signal, and generating a synchronizing signal based on said duty interval;
- motor driving signal generating means for generating a motor driving signal based on said speed driving signal, said phase driving signal, and said synchronizing signal;
- and
- a motor controller controlling said motor based on said motor driving signal.
A servo control method for a motor in a magnetic tape recording and reproducing apparatus comprising:
- a) reproducing a signal from said magnetic tape;
- b) sensing rotation of said motor;
- c) sensing a phase of said motor;
- d) generating a speed driving signal based on output from said step b);
- e) generating a phase driving signal based on output from said step c);
- f) determining a duty interval of synchronous pulses in said reproduction signal;
- g) generating a synchronizing signal based on said duty interval;
- h) generating a motor driving signal based on said speed driving signal, said phase driving signal, and said synchronizing signal;
- and
- i) controlling said motor based on said motor driving signal.
Dependencies are inferred from the claim text.