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Digital deemphasis circuit
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Patent number 5,023,609
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Issue date Jun 11, 1991
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Deutsche ITT Industries GmbH
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Werner Reich
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Digital decimation filter
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Patent number 4,872,129
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Issue date Oct 3, 1989
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Deutsche ITT Industries, GmbH
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Heinrich Pfeifer
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H03 - BASIC ELECTRONIC CIRCUITRY
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Digital demodulator
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Patent number 4,827,515
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Issue date May 2, 1989
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Deutsche ITT Industries GmbH
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Werner Reich
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H04 - ELECTRIC COMMUNICATION TECHNIQUE