Google Patents Automatic amplitude control of speech sound wavesÄownload PDF Info Publication number US3074025A US3074025A US773065A US77306558A US3074025A US 3074025 A US3074025 A US 3074025A US 773065 A US773065 A US 773065A US 77306558 A US77306558 A US 77306558A US 3074025 A US3074025 A US 3074025A Authority US United States Prior art keywords speech sound amplitude tube waves tubes Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US3074025A - Automatic amplitude control of speech sound waves US3074025A - Automatic amplitude control of speech sound waves
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