This paper introduces an 16-lead digital EEG signal acquisition system, which applies MCU MSP430 as central control unit with high performance analog devices and high speed multi-channel, multi-bit analog-to-digital converter as peripheral to retrench analog circuit. Data is transferred to PC by USART interface. Software on PC based on virtual instrument technology realizes real-time detection, display and storage. The system has many advantages such as high precision, stable performance, small volume and low power dissipation, thus provides a new means for digital EEG signal acquisition.
Analog-Digital Conversion ; Electroencephalography ; instrumentation ; Equipment Design ; Signal Processing, Computer-Assisted ; instrumentation ; Software

An opened instrument with liquid crystal display (LCD) for generating and measuring physiological signal is introduced in this paper. Based on a single-chip microcomputer. the instrument uses the technique of LCD screen to display signal wave and information, and it realizes man-machine interaction by keyboard. This instrument can produce not only defined signal in common use by utilizing important saved data and relevant arithmetic, but also user-defined signal. Therefore, it is open to produce signal. In addition, this instrument has strong extension because of its modularized design as computer, which has much function such as displaying, measuring and saving physiological signal, and many features such as low power consumption, small volume, low cost and portability. Hence this instrument is convenient for experiment teaching, clinic examining, maintaining of medical instrument.
Analog-Digital Conversion ; Equipment Design ; Humans ; Microcomputers ; Monitoring, Physiologic ; instrumentation ; Signal Processing, Computer-Assisted ; instrumentation ; Software

This paper mainly introduces the design of digital scanning converter (DSC) for medical endoscopic ultrasound imaging. Fast modified vector totational CORDIC (FMVR-CORDIC) arithmetic complete coordinate conversion is used to increase the speed of ultrasonic scanning imaging. FPGA is used as the kernel module to control data transferring, related circuits and relevant chips' working, and to accomplish data preprocessing. With the advantages of simple structure, nice flexibility and convenience, it satisfies the demand for real-time displaying in this system. Finally, the original polar coordinate image is transformed to rectangular coordinate grey image through coordinate transformation. The system performances have been validated by the experimental result.
Algorithms ; Analog-Digital Conversion ; Capsule Endoscopes ; Endoscopy, Gastrointestinal ; methods ; Equipment Design ; Humans ; Signal Processing, Computer-Assisted ; instrumentation ; Ultrasonography ; instrumentation ; methods

The paper introduced the structure of digital hearing aid in brief firstly, then analyzed and compared signal processing algorithms applied in digital hearing aid, serving respectively in multi-channel frequency compensation, noise reduction and acoustic feedback cancellation. Finally, several special signal processing techniques used in digital hearing aid were introduced.
Algorithms ; Analog-Digital Conversion ; Hearing Aids ; Humans ; Prosthesis Fitting ; Signal Processing, Computer-Assisted ; instrumentation ; Speech Discrimination Tests

Counting-type analog quantity (CAQ), a new conception, is introduced in this article. CAQ possesses some features of analog quantity and digital quantity, that is to say, it has double features. By analysis, two kinds of CAQ are found: one is width-modulated countable pulse series, the other is frequency-modulated countable pulse series. Furthermore, the method of generating CAQ is described and its double feature is also proved. It is very convenient to realize single-channel or multi-channel analog-to-digital (A/D) conversion by using CAQ without utilizing present integrated A/D conversion chip. In this paper, for proving its feasibility, multi-channel telemetering computer system for dynamic information about human vascular wall,a typical example of using CAQ in medicine, is expatiated. The typical example clearly indicates: not only the method for application of CAQ is simple and viable, but also the application of CAQ is very wide.
Analog-Digital Conversion ; Blood Vessels ; physiology ; Computer-Aided Design ; Elasticity ; Electronics, Medical ; instrumentation ; Humans ; Monitoring, Physiologic ; instrumentation ; Signal Processing, Computer-Assisted