Design of PC-programmable digital hearing-testing device

Author

Patel, Jasbir N. ; Abid, Z.

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Western Ontario, London, Ont.

fYear

2005

fDate

1-4 May 2005

Firstpage

244

Lastpage

247

Abstract

The design of PC programmable digital hearing-testing device is described in this paper targeting the testing of hearing impairedness in a laboratory environment. It is used to measure the response of each ear at different frequencies and at different sound pressure level (SPL). The device input is the serial 12-bit data and 7-bit control signal from USB connection while the output signal is sound waves with frequency range from 20 Hz to 20 KHz. This device is designed and simulated in 0.18 mum CMOS technology. It is composed of digital components except for the active filter. The device is designed as a single chip to fit on a 32 Omega headphones and powered by 1.3 V supply. The device is designed without using any ADC and DAC converters. Improved designs of 12-bit counter, clock generator and control are proposed. PWM generator is designed using digital components only to provide more accuracy and reliability. A second order, Butter-worth active low-pass filter is used as demodulator. The SPL output of the device is PC controllable through the USB connection

Keywords

Butterworth filters; CMOS digital integrated circuits; hearing; low-pass filters; microcomputer applications; patient diagnosis; test equipment; 0.18 mum; 1.3 V; 12 bit; 12-bit counter; 20 Hz to 20 kHz; 32 ohm; 7 bit; Butterworth active low-pass filter; CMOS technology; PC-programmable digital hearing-testing device; PWM generator; USB connection; active filter; clock generator; demodulator; headphones; hearing impairedness testing; sound pressure level; Active filters; Auditory system; CMOS technology; Ear; Frequency measurement; Headphones; Pressure measurement; Pulse width modulation; Testing; Universal Serial Bus;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical and Computer Engineering, 2005. Canadian Conference on

Conference_Location

Saskatoon, Sask.

ISSN

0840-7789

Print_ISBN

0-7803-8885-2

Type

conf

DOI

10.1109/CCECE.2005.1556919

Filename

1556919