In order to improve the speech quality and auditory perceptiveness of electronic cochlear implant under strong noise background, a speech enhancement system used for electronic cochlear implant front-end was constructed. Taking digital signal processing (DSP) as the core, the system combines its multi-channel buffered serial port (McBSP) data transmission channel with extended audio interface chip TLV320AIC10, so speech signal acquisition and output with high speed are realized. Meanwhile, due to the traditional speech enhancement method which has the problems as bad adaptability, slow convergence speed and big steady-state error, versiera function and de-correlation principle were used to improve the existing adaptive filtering algorithm, which effectively enhanced the quality of voice communications. Test results verified the stability of the system and the de-noising performance of the algorithm, and it also proved that they could provide clearer speech signals for the deaf or tinnitus patients.
Algorithms ; Cochlear Implantation ; Cochlear Implants ; Electronics ; Humans ; Noise ; Signal Processing, Computer-Assisted ; Speech ; Speech Perception

According to the large stray capacitance of the gate terminal of power MOSFET,this paper introduces the main characteristics and application of IC driver MAX626/7/8,especially designed for the high speed power MOSFET.The ultrasound generator made from that chip is simple in circuit,stable when working as well as small and light for carrying.

As a disease difficult to treat,the refractory ascites due to post hepatitis often results in a bad prognosis because the general medical treatment is ineffective.This paper introduces the current interventional treatment of the refractory ascites.

A realizaton project of electrical stimulator aimed at motor dysfunction of stroke is proposed in this paper. Based on neurophysiological biofeedback, this system, using an ARM9 S3C2440 as the core processor, integrates collection and display of surface electromyography (sEMG) signal, as well as neuromuscular electrical stimulation (NMES) into one system. By embedding Linux system, the project is able to use Qt/Embedded as a graphical interface design tool to accomplish the design of stroke rehabilitation apparatus. Experiments showed that this system worked well.
Biofeedback, Psychology ; Computers ; Electric Stimulation Therapy ; instrumentation ; Electromyography ; Equipment Design ; Humans ; Software ; Stroke Rehabilitation

This pap er introduces something of photodynamic therapy including the basic principles,pho tosensitizers and recent situation of clinical trial.Its light source,research and clinical applications to malignant tumors are also presented.

Exercise quantity is one of the important indexes used to evaluate physical consumption during training, so it is necessary to design a kind of instrument to accurately measure physical consuption. It must be practical, portable and with a low power consumption. This article introduces the mechanism of measuring exercise quantity. The methods of traditional and acceleration compared, the latter is selected. The design is described from the two aspects of general design and component choosing.

It's very difficult segment the medical microscopic image for its features such as multi-objective, complicated background, abundant disturbances and noises, little contrast. After comparing the results of several segmentation arithmetics, this paper puts forward an OTSU-based self-adaptation threshold partition algorithm for effective segmentation of medical microscopic image.

Aiming at the single treatment and the design separation between treatment and assessment in electrotherapy equipment, a kind of system including low-intermediate frequency treatment and efficacy evaluation was developed. With C8051F020 single-chip microcomputer as the core and the circuit design and software programming used, the system realized the random switch of therapeutic parameters, the collection, display and data storage of pressure pain threshold in the assessment. Experiment results showed that the stimulus waveform, current intensity, frequency, duty ratio of the system output were adjustable, accurate and reliable. The obtained pressure pain threshold had a higher accuracy (< 0.3 N) and better stability, guiding the parameter choice in the precise electrical stimulation. It, therefore, provides a reliable technical support for the treatment and curative effect assessment.
Electric Stimulation Therapy ; instrumentation ; Equipment Design ; Microcomputers ; Pain Measurement ; instrumentation ; Software

Phonocardiogram exercise testing(PCGET) is a recently developed method for evaluating cardiac contractility and the cardiac reserve of patients with heart disease and of healthy subjects. In order to test the reliability of PCGET method in physical sport, the present author conducted a clinical study. The ratio of the amplitude of the first heart sound after PCGET to that recorded at rest was defined as an indicator, i.e. cardiac contractility reserve index (CCRI). PCGET was performed on 30 athletes and 30 non-athletes. The results showed that the average of CCRI was 10.139 +/- 2.631 in 30 athletes and 6.612 +/- 3.104 in 30 non-athletes. There was a significant difference between CCRI of the two groups (P < 0.01). Thus, PCGET might be a noninvasive, convenient and inexpensive technique to evaluate the cardiac reserve quantitatively for athletes.
Adolescent ; Adult ; Exercise Test ; methods ; Feasibility Studies ; Humans ; Myocardial Contraction ; physiology ; Phonocardiography ; methods ; Sports ; physiology

Bovine spongiform encephalopathy (BSE) is an infectious disease which can threaten animal husbandry and human health seriously. The disease mainly violates the central neural system. This article selectively reviewed current researches on the analytical detection of BSE and transmissible spongiform encephalopathy (TSE).
Animals ; Cattle ; Encephalopathy, Bovine Spongiform ; diagnosis ; transmission ; virology ; Humans ; Prions ; isolation & purification