Method to calibrate acoustic instruments, and calibration system

Details Method to calibrate acoustic instruments, and calibration system Method to calibrate acoustic instruments, and calibration system

1986-06-20

1988-05-31

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Testing, monitoring, or calibrating

73 1DV, 73585, H04B 1700

Patent

active

047485981

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

REFERENCES:
patent: 3942150 (1976-03-01), Booth et al.
patent: 3959770 (1976-05-01), Schaefer
patent: 4240281 (1980-12-01), Lather et al.
patent: 4615007 (1986-09-01), King et al.
Short, Microprocessors and Programmed Logic, 1981, pp. 38-39.
Fiedler/Wassenberg "Handbuch der Medizintechnik" pp. 5-7.
"Handbook of Clinical Audiology" 1978, pp. 179-187.

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