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3. 发明授权

US3936607A Electronically variable audiometer of the von Bekesy type 失效
标题翻译： von Bekesy型电子可变听力计
公开(公告)号：US3936607A
公开(公告)日：1976-02-03
申请号：US419602
申请日：1973-11-28
申请人： Sidney Gordon
发明人： Sidney Gordon
IPC分类号： A61B5/12 , H04R29/00
CPC分类号： A61B5/121
摘要： The disclosure relates particularly to audiometers, such as used in ascertaining the hearing ability of test subjects. Functionally, the new audiometer is similar to the so-called von Bekesy audiometer. However, the new system incorporates unique and advantageous circuit arrangements which enable controlled variable attenuation of a power signal to be achieved through simple and reliable electronic means. The new system eliminates the costly and fast-wearing electro-mechanical mechanism customarily used and heretofore considered necessary in a von Bekesy audiometer. The new electronic attenuation system includes means, effective in the extremely low power range of audiometer signal generation, to apply a high level, controllably variable signal, and to attenuate that signal across a high ratio voltage divider. In the high power ranges of the audiometer, the generated signals need not be attenuated in the first instance, and the voltage divider is rendered ineffective automatically when the system operates in the higher ranges. A current amplifier supplies the necessary additional current requirements for high level signals.The new system is unique in its ability to generate an extremely low power adiometer signal by electronic means while effectively obviating the problem of unfavorable noise-to-signal ratios in the low power ranges.
摘要翻译：本公开特别涉及听力计，例如用于确定测试对象的听力能力。功能上，新的听力计类似于所谓的von Bekesy听力计。然而，新系统结合了独特且有利的电路布置，其使得能够通过简单和可靠的电子装置实现功率信号的受控可变衰减。新系统消除了在冯·贝克斯听力计中通常使用和迄今为止认为必要的昂贵且快速穿戴的机电机械。新的电子衰减系统包括在听力计信号产生的极低功率范围内有效的装置，以施加高电平，可控制的可变信号，并且在高比分压器上衰减该信号。在听力计的高功率范围内，所产生的信号在第一种情况下不需要衰减，并且当系统在较高的范围内工作时，分压器自动无效。电流放大器为高电平信号提供必要的附加电流要求。

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