Apparatus for variable speed playback of plural track records
Abstract
Abstract AN APPARATUS FOR PLAYBACK OF PLURAL TRACKS OF RECORDED INFORMATION AT SELECTIVELY DIFFERENT TRACK RECORD SPEEDS, THE APPARATUS CONSISTING OF A RECORD PLAYBACK UNIT CAPABLE OF PLAYING BACK A SELECTED ONE OF PLURAL RECORD TRACKS EACH CARRYING A CONTROL SIGNAL OF PREDETERMINED, CONSTANT FREQUENCY, AND HAVING CONTROL CIRCUITRY FOR RECEIVING PLAYBACK CONTROL SIGNAL AND CONVERTING IT TO A DC CONTROL VOLTAGE PROPORTIONAL TO FREQUENCY FOR USE IN CONTROLLING THE RECORD PLAYBACK SPEED OF THE PLAYBACK UNIT. THE DC CONTROL VOLTAGE IS APPLIED THROUGH A NONLINEAR NETWORK TO CONTROL A DRIVE AMPLIFIER WHICH, IN TURN, REGULATES THE FORWARD DRIVE MOTOR OF THE RECORD PLAYBACK UNIT TO MAINTAIN THE PLAY-BACK CONTROL SIGNAL AT IS PROPER REFERENCE FREQUENCY VALUE.
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| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |