Cross-talk elimination system for an instructional tape recorder

Claim 1

A cross-talk elimination system for an instructional tape recorder, comprising, in combination, a magnetic tape having first and second recording tracks thereon; a program channel having a first magnetic recording/reproducing head and a first recording/reproducing circuit for recording/reproducing an instructional program onto said first recording track of said magnetic tape; a student channel having a second magnetic recording/reproducing head and a second recording/reproducing circuit for recording/reproducing a learner''s oral sigNal onto said second recording track of said magnetic tape; a coupling network means for coupling signals from said program channel with signals from said student channel; a monitor amplifier means for amplifying a signal from said coupling network means and for driving a headphone or a loudspeaker in order to make it possible for said learner to hear said instructional program and said learner''s signal simultaneously; an electrical network means connected to said second magnetic recording/reproducing head for producing a compensating electric signal having the same amplitude and phase as a leakage signal appear across a winding of said first magnetic recording/reproducing head at a reproducing mode when said second magnetic recording/reproducing head is at a recording mode; and a mixing network means connected between said electrical network means and said first magnetic recording/reproducing head for combining differentially said compensating electric signal with an electric signal appearing across a winding of said first magnetic recording/reproducing head in order to reduce the amplitude of said leakage signal when said first magnetic recording/reproducing head and said second magnetic recording/reproducing head are at a reproducing mode and a recording mode, respectively.