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On the aged society coming soon, many studies have explored homecare technologies. In this work, the activities at home are captured by a panoramic camera located at the center of a living room, and then analyzed and classified into standing, walking, sitting, falling, and watching television. First, the background subtraction scheme accompanied with shadow removal, and morphological operators of...
Attention plays a critical role in effective learning. By means of attention assessment, it helps learners improve and review their learning processes, and even discover Attention Deficit Hyperactivity Disorder (ADHD). Hence, this work employs modified smart glasses which have an inward facing camera for eye tracking, and an inertial measurement unit for head pose estimation. The proposed attention...
In this work, a high-gain wide-bandwidth optical receiver consisting of a trans-impedance amplifier, a limiting amplifier, and an output buffer is developed. Especially in each gain stage of a limiting amplifier, the high-gain 4'th-order Multi-Level Active Feedback (MLAF) structure with serial inductor peaking is employed to effectively increase the bandwidth and the gain. The TSMC 90nm CMOS technology...
This work is to develop an intelligent driver-assistance system which can perceive the physiological state of a driver to avoid fatigue driving. The proposed system includes a camera, a wireless ElectroCardioGram (ECG) sensor patch, and a computation platform. The camera in front of a driver is to catch a face image which is processed to obtain features of a mouth for identifying a yawn. The sensor...
The paper presents an over-current protection circuit designed for high voltage power switches. The proposed protection mechanism employs a current limiter to monitor the current flowing through the power switch. The current limiter protects the power switch from potential damage by automatically switching off the device once the current exceeds the preset rating value. Simulated results exhibit that...
This work proposes a voice-activity home care system which can construct a life log associated with voices at home. Accordingly, the techniques of sound-pressure-level calculation, abnormal sound detection, noise reduction, text-independent speaker recognition and keyword spotting are developed. In abnormal sound detection and speaker recognition, we adopt the two-stage recognition processes of Gaussian...
This brief studies the transimpedance of the regulated cascode (RGC) structure and develops a multilevel active feedback (MLAF) structure to build an inductorless CMOS differential transimpedance amplifier (TIA). The proposed TIA consists of an input stage, a single-to-differential circuit, a gain stage, and an output buffer. The input stage adopts the RGC structure of which transimpedance is theoretically...
Existing methods have addressed the issue of detecting abnormal events at a smart home for medical care or security monitoring services extensively in the past decades. However, most of approaches use wearable sensors that require users to be equipped with the sensor devices at every moment. If the monitored users stop or pause the sensors, any abnormal events are not able to be detected. The use...
This work proposes the arousal-selection and feature-selection schemes to improve speaker's gender and age identification performance. Our previous results showed that gender and age recognition rates would increase as affective stimulation degrees were lower and higher, respectively. Considering a practical scenario, the speaker's mood does not alter frequently, so speech frames are partitioned into...
In this work, we develop a high-frequency and power-efficiency ultrasound beam-forming processor which consists of two 8-channel Low-Voltage Differential Signaling (LVDS) receivers and a 16-channel beam-forming module. The proposed LVDS receiver includes the front-end receiving buffer of a pre-amplifier, a hysteresis comparator and an adjustable delay chain, and the back-end signal extractor of a...
Fall injury is already a major problem in elderly health care. This work develops a self-adaptive fall-detection apparatus which is embedded in glasses for users easily to put on. The proposed system adopts a 9-axis sensing module of a triaxial magnetometer, accelerometer and gyroscope. First, the magnetometer is to filter out some normal events like head rotating, based on variations of rotation...
To achieve a large bandwidth without inductor peaking, this work presents an inductor-less bandwidth-extension technique to establish Multi-Level Active Feedback (MLAF) structure that is used in a CMOS differential Trans-Impedance Amplifier (TIA). The proposed TIA consists of a trans-impedance stage, a low-pass filter, a gain stage, and an output buffer. The trans-impedance stage adopts the regulated...
This work proposes an online interactive-duet KTV system with emotional scoring, which consists of real-time communication, synchronous playback, chatting box and emotional scoring mechanism. The experimental results demonstrate that most of time differences between two users are less than 50ms and emotional scoring is very promising.
This work is to establish an auto-calibration around-view monitoring system to avoid the inconsistent performance from deviations of camera installation. First, a vehicle is parked at a specific area which has a special pattern on the ground. Second, the captured images from four embedded cameras are compared with the reference pattern images to obtain the deviations in angle, X- axis and Y-axis....
A 44×36-pixel 3D CMOS image sensor is developed based on the Time-Of-Flight (TOF) scheme where N-well_P-substrate photodiodes with a large breakdown voltage are adopted. Additionally, the breakdown voltages of photodiodes are well explored with consideration of crosstalk. This image sensor includes photodiodes, pixel sensing circuits, sense amplifiers, pixel-activated decoders, Time-to-Digital Converters...
In this work, a typical hierarchical Support Vector Machine (SVM) classifier structure with three stages is adopted to identify 6 affective modes of happy, angry, excited, nervous, sad and calm from Musical TeleVision (MTV) sequences, which comprise audio and video signals. To comprehend emotional modes, audio features including the spectral centroid, spectral spread, zero crossing rate, peak of zero...
In this work, emotion-inspired age and gender recognition systems are developed. In the beginning, speakers' utterances with emotions of angry, happy, calm and sad are analyzed to identify their ages and genders where the recognition engine adopts a Support Vector Machine (SVM). According to the experimental results, the accuracies of the age and gender recognitions under a low arousal emotion tend...
A miniaturized monopole slot antenna is proposed to realize digital TV applications. This antenna is designed with the feed-in space and straight gap to effectively establish a wide bandwidth. However, in order to minimize an antenna size, a pair of slot lines is properly adopted to accomplish good impedance matching at the Ultra High Frequency (UHF) band. Experimental results demonstrate that the...
This work presents a monopole antenna with a matching circuit printed on a 1.0-mm thick FR4 substrate for terrestrial broadcasting systems of digital TV. This antenna comprises an iron stick, a matching circuit and a ground pad. To enhance receiving performance, a matching circuit is embedded between an iron stick and a ground pad, which yields a good impedance matching and achieves a wideband operation...
This work is to explore a frequency-domain down-sizing method which preserves picture quality and consumes low complexity in a video decoder. The conventional frequency-domain down-sizing methods usually yield a drift error owing to frequency-domain coefficient truncation and motion compensation using small reference frames. The proposed method can overcome this drawback by using non-zero coefficient...
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