Circuit for compensating for the drop-out of a reproduced video signal

A dropout compensator for a video reproducing apparatus, comprising:

• delay means for delaying a reproduced video signal to generate a delayed signal;
• voltage controlled amplifier means for generating an amplified delay signal in response to first and second amplification control signals;
• switching means for selectively providing one of said reproduced video signal and said amplified delay signal in response to a drop-out detecting signal;
• first inverting means for inverting said reproduced video signal to generate an inverted reproduced video signal;
• second inverting means for inverting said amplified delay signal to generate an inverted amplified delay signal;
• first muting means for extracting and providing a first synchronous output signal by selectively enabling transmission of said inverted reproduced video signal in response to a separated horizontal synchronous signal separated from said reproduced video signal;
• second muting means for extracting and providing a second synchronous output sisal by selectively enabling transmission of said inverted amplified delay signal in response to said separated horizontal synchronous signal;
• first comparator means having a first non-inverting port and a first inverting port for generating said first amplification control sisal by comparing said first synchronous output signal received at said first non-inverting port with said second synchronous output signal received at said first inverting port;
• second comparator means having a second non-inverting port and a second inverting port for generating said second amplification control signal by comparing said first synchronous output signal received at said second inverting port with said second synchronous output signal received at said second non-inverting port;
• and
• said voltage controlled amplifier means generating said amplified delay signal by adjusting an amplitude of said delayed signal in response to said first and second amplification control signals.

A dropout compensating method for compensating for a portion of a reproduced video signal having a reduced amplitude in a video reproducing apparatus, said method comprising the steps of:

• delaying said reproduced video signal to generate a delayed signal;
• extracting a separated synchronous signal from said reproduced video signal;
• extracting and providing only a first synchronous output signal by muting said reproduced video signal in response to said separated synchronous signal;
• extracting and providing only a second synchronous output signal by muting an amplified signal in response to said separated synchronous signal;
• comparing said first and second synchronous output signals to generate amplification control signals;
• adjusting an amplitude of said delayed signal in dependence upon said amplification control signals to generate said amplified signal;
• and
• alternately enabling transmission of said reproduced video signal and said amplified signal in response to a drop-out detecting signal to generate a compensated signal, said compensated signal including a portion to compensate for said portion of said reproduced video signal having the reduced amplitude.

A dropout compensator for a video reproducing apparatus, comprising:

• delay means for delaying a reproduced video signal to generate a delayed signal;
• voltage-controlled amplifier means for adjusting an amplitude of said delayed signal to generate an amplified delayed signal;
• switching means for alternately enabling transmission of one of said reproduced video signal and said amplified delayed signal in response to a drop-out detecting signal indicating that a portion of said reproduced video signal has a reduced amplitude, said drop-out detecting signal having a pulse width corresponding to said portion of said reproduced video signal having the reduced amplitude;
• first muting means for extracting and providing a first synchronous output signal corresponding to said reproduced video signal by selectively enabling transmission of said reproduced video signal in response to a separated synchronous signal;
• second muting means for extracting and providing a second synchronous output signal corresponding to said amplified delayed signal by selectively enabling transmission of said amplified delayed signal in response to said separated synchronous signal;
• first comparator means having a first non-inverting port and a first inverting port for generating a first amplification control signal by receiving said first synchronous output signal at said first non-inverting port and receiving said second synchronous output signal at said first inverting port;
• and
• second comparator means having a second non-inverting port and a second inverting port for generating a second amplification control signal by receiving said first synchronous output signal at said second inverting port and receiving said second synchronous output signal at said second non-inverting port;
• said voltage controlled amplifier means adjusting said amplitude of said delayed signal in response to said first and second amplification control signals.

A drop-out compensator for a video reproducing apparatus, comprising:

• delay means for delaying a reproduced video signal to generate a delayed signal;
• voltage-controlled amplification means for adjusting an amplitude of said delayed signal to generate an amplified delay signal;
• switching means for selectively providing one of said reproduced video signal and said amplified delay signal in response to a drop-out detecting signal indicating that a portion of said reproduced video signal has a reduced amplitude, said drop-out detecting signal having a pulse width corresponding to said portion of said reproduced video signal having the reduced amplitude;
• inverting means for inverting said reproduced video signal to generate an inverted reproduced video signal, and for inverting said amplified delay signal to generate an inverted amplified delay signal;
• muting means for extracting and providing a first synchronous output signal by selectively enabling transmission of said inverted reproduced video signal in response to a separated synchronous signal, and for extracting and providing a second synchronous output signal by selectively enabling transmission of said inverted amplified delay signal in response to said separated synchronous signal;
• and
• comparator means having first and second inverting ports and first and second non-inverting ports for generating a first amplification control signal by inputting said first synchronous output signal to said first non-inverting port and inputting said second synchronous output signal to said first inverting port, and for generating a second amplification control signal by inputting said first synchronous output signal to said second inverting port and inputting said second synchronous output signal to said second non-inverting port;
• said voltage controlled amplification means adjusting said amplitude of said delayed signal in response to said first and second amplification control signals.