Noise reduction apparatus

Details Noise reduction apparatus Noise reduction apparatus

H - Electricity

04

N

352/14

H04N 5/78 (2006.01)

Patent

CA 1147852

IN THE RECEIVING OFFICE OF THE UNITED STATES PATENT AND TRADEMARK OFFICE INTERNATIONAL APPLICATION UNDER THE PATENT COOPERATION TREATY NOISE REDUCTION APPARATUS Abstract of the Disclosure An improved apparatus for reducing noise in a frequency-modulated data stream of the type utilizing a reference stream of predetermined frequency that has been subjected to essentially the same noise. In a preferred embodiment of the apparatus, the data stream is transformed into a first signal of value propor- tional to the frequency of the data stream, and the reference stream is transformed into a second signal that has a value proportional to the product of the reference stream frequency times a feedback value. The feedback value is derived from a combination of the first and second signals. One of the important uses of the apparatus is in connection with frequency modulation tape recording systems.

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