Blank detector for cassette tape player

Dynamic magnetic information storage or retrieval – General processing of a digital signal – Inter-record gap processing

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360 46, G11B 509

Patent

active

054001889

ABSTRACT:
Digital signal processing (DSP) employing a differential mean calculation automatically distinguishes sections of blank tape from program material (such as music or voice) on cassette tapes. Blank tape produces a negligible differential mean value while program material produces substantial differential mean values. Thus, each differential mean is compared to a threshold so that a cassette player can be commanded to fast forward through a blank section of tape. A music envelope detector insures that low amplitude music signals are not detected as blank.

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