In accordance with the invention, a timing signal is recorded containing certain information that is used, upon playback, to produce a reference marker which is compared with the detectable characteristics of recorded information signals to produce {HEAD ~ a measure} of {TAIL ~ skew distortion} 
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In accordance with the invention , a timing signal is recorded containing certain information that is used , upon playback , to produce a reference marker which is compared with the detectable characteristics of recorded information signals to produce { HEAD ~ a measure } of { TAIL ~ skew distortion }
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