Method to calibrate acoustic instruments, and cali

专利名称：Method to calibrate acoustic instruments,

and calibration system

发明人：Wolfgang Kopke申请号：US06/876821申请日：19860620公开号：US04748598A公开日：19880531

摘要：To provide for permanent calibration of an audiometer, for example, to holdthe calibration even in case of an interruption of supply voltage, an electrically erasableprogrammable and reprogrammable read-only memory (EEPROM) (15) receivescalibration data in a closed loop by comparing the output of a transducer (13) with theinput to a measuring microphone (31), in digital form and after digitizing, with commandoutputs stored in a computer (22). A tone generator (11), likewise controlled by thecomputer, provides control frequencies via a controlled amplifier (12) to the transducer(13). The calibrating EEPROM (15) receives correction data from the computer via a databus (29) which, in turn, controls the resistance of a switchable resistance (18, 181) toprovide a correction voltage to the amplifier (12).

申请人：ROBERT BOSCH GMBH

代理机构：Frishauf, Holtz, Goodman & Woodward

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