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Hitachi Ltd
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Hitachi Ltd
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Application filed by Hitachi LtdfiledCriticalHitachi Ltd
Priority to JP4132575ApriorityCriticalpatent/JPS51116658A/en
Publication of JPS51116658ApublicationCriticalpatent/JPS51116658A/en
PURPOSE: To reduce aperture effect and to make a coder of voice band level effectively into an integrated circuit by converting the signal from a differentiated input analog signal into a frequency-modulation code.