Jitendranath Bera

ECG Acquisition and Automated Remote Processing

ECG Acquisition and Automated Remote Processing - Libros de Medicina - Electrocardiografia - 99,99

An FPGA implementation of real-time QRS detection

This paper illustrates a simple algorithm for real time QRS detection from ECG data. The algorithm is implemented on Xilinx field programmable gate array using very small number of memory cells. Single lead Synthetic ECG using ptb-db database (from Physionet) is generated from a personal computer using the parallel port (LPT1) at 1 ms sampling interval and delivered to the FPGA (Field Programmable Gate Array) board. At first, from the first 1500 samples, the QRS detection algorithm calculates some characteristic amplitude and slope based signatures which are used to form a rule base. These rules are used for detecting the next incoming QRS regions accurately. The index points of R-peaks are determined and shown in the LEDs using switch-based commands.

Sample shifting technique (SST) for estimation of harmonic power in polluted environment

In this paper, an attempt has been made to estimate real and reactive power components for each harmonic in a polluted sinusoidal environment based on a newly proposed sample shifting technique (SST). A special feature of this technique is that each harmonic power component is estimated from the samples of voltage and current signals only, without measuring the power factor angle, or adopting FFT or DFT etc. as used by traditional methods. The present method also determines the DC power component along with the sinusoids. The method of SST is supported by simulation results along with experimental validation.

Development of microcontroller based single phase SPWM inverter with remote control facility

This paper presents the development of a state-of-the-art remotely controlled single phase Sinusoidal Pulse Width Modulated (SPWM) inverter with the incorporation of RISC microcontroller. A provision of remote control from a PC in addition to the local control is incorporated in order to control the functionality of the inverter. The microcontroller itself generates the required pulse according to the remote command, to get variable output frequency from the inverter using the SPWM scheme. Finally the same is experimentally tested for resistive and inductive load and satisfactory result is obtained.

Development of an efficient photovoltaic MPPT Controller

A Maximum Power Point Tracking (MPPT) Controller using a buck converter has been designed and developed for a standalone Photovoltaic(PV) array. Perturb and Observe (P&O) algorithm has been implemented on a microcontroller to achieve the maximum power output from PV array. The whole developed hardware system has been tested with and without MPPT in a conventional PV array. The results show that the introduction of MPPT controller increases the efficiency of the conventional PV array.

GSM based condition reporting system for power station equipments

This work describes a condition based reporting system of Power plant components using GSM technology. In this present approach, a dedicated microcontroller based hardware unit (DHU) has been developed to continuously measure the parameters of the viz. voltage, current, speed of turbine, frequency of generation etc. of the alternator to monitor the running condition of it also. Other than the generator there are subsystems which also need continuous monitoring. In this monitoring system each equipment is connected with one such DHU which is also connected to a Global System for Mobile Communication (GSM) modem. The preliminary level of fault or abnormality in operation of each component is diagnosed by the respective DHU and the fault or abnormalities details are reported to the pre-assigned operator through an SMS service. In extreme case, the provision of equipment shut down by a return SMS is also provided. A proto-type laboratory model has been set up and is working satisfactorily.

A bi-phase enabled serial acquisition system for remote processing of digitized ECG

This paper presents an approach for acquiring digitized ECG samples in a personal computer using an offline communication technique. For this, two standalone embedded modules are placed at the two ends of the communication link. The transmit end module collects ECG samples from the source and stores them in a RAM. Finally it converts each data byte into a bi-phase encoded bit stream for transmission using a standard telephone set through post office telephone line. The receive-end module, coupled with the telephone receiver decodes the ECG data, and then delivers them to a desktop computer through the serial port. An application software in the computer is used to store these samples for visual inspection. The detailed architecture and test results are discussed with synthetic ECG data available from PTB diagnostic ECG database (ptb-db) under Physionet.

Development of a State-of-the-Art ECG DAS for Storing, Processing and Analysis Using MATLAB-Based GUI and Microprocessor

This paper illustrates a low cost novel method for ECG signal acquisition, display and storage using a Graphical User Interface (GUI), which provides a user-friendly front end by using MATLAB-based toolsets. At first, analog ECG has been converted to its digital equivalent with the help of an ADC. Microcontrollers converted this data to a serial (RS232) format and transmit to the PC for serial acquisition. The developed GUI performs the acquisition for its future processing.

ECG Acquisition in a Computer

Most of the modern electrocardiogram recording systems in a clinical setup use a desktop computer as the final data acquisition element.

An intelligent telecardiology system for offline wireless transmission and remote analysis of ECG

This paper illustrates a wireless system developed for offline ECG transmission and its remote processing. At the transmit end, a standalone embedded system collects short duration ECG samples from the source, stores them in a RAM and then encodes these using a customized bi-phase modulation for offline transmission in ISM band. At the receive end, another embedded system extracts ECG data from the demodulated output of the wireless receiver and delivers to a desktop computer using the serial port. An application software stores these samples in a text file. At first, the bit error and packet error are computed from the received dataset. Then, computed ECG wave durations and intervals along with lead data plot are generated on a Graphical User Interface for preliminary level diagnosis. Test results with synthetic ECG from PTB diagnostic ECG database (ptb-db) for short range of communication are reported.