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Digital graphic equalizer
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Patent number 5,524,022
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Issue date Jun 4, 1996
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Pioneer Electronic Corporation
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Hisashi Kihara
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H03 - BASIC ELECTRONIC CIRCUITRY
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Automatic level control circuit
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Patent number 5,043,676
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Issue date Aug 27, 1991
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Pioneer Electronic Corporation
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Takeshi Sato
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H03 - BASIC ELECTRONIC CIRCUITRY
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Limiter circuit
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Patent number 4,928,071
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Issue date May 22, 1990
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Pioneer Electronic Corporation
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Hideo Yamamoto
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H03 - BASIC ELECTRONIC CIRCUITRY
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Signal processing circuit
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Patent number 4,449,229
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Issue date May 15, 1984
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Pioneer Electronic Corporation
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Shuichi Mori
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H04 - ELECTRIC COMMUNICATION TECHNIQUE