Method and apparatus for introducing subliminal changes to audio stimuli

摘要: A method and apparatus for introducing gradual changes to an audio signal so that the are subliminal. The can involve tempo volume, example, take form of a gentle gradient having ever increasing/decreasing ramp-like over sufficient duration, or more complex program involving several gradients. In preferred embodiment, enhanced play-back device such as portable cassette recorder be programmed subliminally alter characteristics standard pre-recorded tape containing music, example. As motivational tool during walking, jogging other repetitive exercise, is gradually increased period time encourage corresponding (and subliminal) increase in physical exertion by user whose rate movement proportional music. either manually changed conjunction with subliminal program, itself override mode, version present-inventive which allows only manual alternation. alternate special contains tempo, on (which operates at one speed, only) cause same effect embodiment.