A Measuring Medical Pocket Calculator

Abstract

A measuring medical pocket calculator is presented. The hardware is built around a BASIC-Stamp microcontroller and includes a keyboard, a liquid crystal display, a dual analogue-to-digital converter, digital outputs and a serial port for data exchange with a personal computer. The software is based on a generic programmable calculator and can be adapted to suit specifi c applications. As an example, a dedicated audiologic calculator is presented. It features one-key conversions between different measures of acoustic levels, a hearing aid battery tester, automated calculation of percent hearing loss, and frequency specifi c, age-corrected comparisons (percentiles) to hearing thresholds of the general population.

A Two-Microphone Noise Reduction System for Cochlear Implant Users with Nearby Microphones—Part II: Performance Evaluation

“…The basic algorithm shown in Figure 1 was evaluated in two different simulated acoustic environments. While the amount of noise reduction can be predicted for similar devices with microphones placed above both ears of the user [8,9] to date there is no such theoretical framework for the device in Figure 1. The room simulation procedure used [5] is based on an image method and simulates impulse responses between acoustic sources and microphones in shoeboxshaped rooms, taking the head shadow of the listener into account.…”