Distortion reduction circuit for video playback
AssigneeRobert Bosch GmbH
InventorBerthold Eiberger
Life of this patent
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Abstract
The correction of broadband signals reproduced from magnetic tape are corrected for distortion by three stages in cascade, which the first serves to correct distortion in the group propagation time through the system of playback magnetic head and playback preamplifier, the second directs for amplitude distortion including a 90.degree. phase rotation and the third stage provides equilization to compensate for high frequency losses.
Claims6
Apparatus for removal of distortion from broadband signals reproduced from a magnetic tape record by a playback apparatus including a magnetic head signal pick-up means and a preamplifier for amplifying the output of said pick-up means, said distortion removal apparatus including:
- a first stage having an input connected to said preamplifier for compensatory removal of distortion of said signals which was caused by distortion of group propagation signal time of signal components passing through said pick-up means and said preamplifier, and for providing a first partially distortion-corrected signal at an output of said first stage;
- a second stage, having an input connected to said output of said first stage, for providing reduction of signal amplitude distortion and at the same time providing 90.degree. phase rotation and for providing a second partially distortion-corrected signal at an output of said second stage, and
- a third stage, having an input connected to the output of said second stage, for compensation of high frequency signal amplitude with linear phase characteristic.
Dependencies are inferred from the claim text.