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Echo canceller
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Patent number 5,528,687
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Issue date Jun 18, 1996
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Fujitsu Limited
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Yoshinori Tanaka
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Variable rate coder
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Patent number 5,159,611
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Issue date Oct 27, 1992
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Fujitsu Limited
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Yoshihiro Tomita
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Speech coding apparatus
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Patent number 5,138,662
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Issue date Aug 11, 1992
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Fujitsu Limited
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Fumio Amano
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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Voice detection apparatus
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Patent number 5,103,481
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Issue date Apr 7, 1992
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Fujitsu Limited
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Kohei Iseda
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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Timing-phase recovery circuit
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Patent number 4,312,075
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Issue date Jan 19, 1982
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Fujitsu Limited
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Kazuo Murano
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H04 - ELECTRIC COMMUNICATION TECHNIQUE