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ELECTRONIC RECORDING/REPRODUCING APPARATUS EMBODYING NOISE REDUCTION CIRCUITS FOR USE IN CONNECTION WITH AUDIO [ AND VIDEO ] SIGNALS--NAMELY, MAGNETIC TAPE RECORDERS,, CASSETTE RECORDERS, [ RECORD PLAYERS, ] RADIO [ TRANSMITTERS AND ] RECEIVERS, AND MOTION PICTURE SOUND TRACK RECORDING AND REPRODUCING APPARATUS; MAGNETIC TAPES [ , DISCS, ] * AND * MOTION PICTURE SOUND TRACKS [ , AND VIDEO RECORDINGS ] OF ELECTRICAL SIGNALS WHICH HAVE BEEN SUBJECTED TO DYNAMIC RANGE COMPRESSION PRIOR TO RECORDING