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This paper describes a fourth order continuous time band pass filter used to filter analog signals coming from passive infrared sensors (PIR). Specifications for this filter are characterized by an extremely large time constant which strongly condition the topology of the filter used. Moreover, very low power consumption is also required, since these filters are implemented together with the sensor...
Described is an efficient and low complexity technique to encode binary sequences like the significance map generated in wavelet-based compression methods. This is achieved using a generalised form of the bintree partitioning for 1-D signals, the vector K-tree partitioning. Results show higher compression rate and lower compression time than other binary sequences compression methods. Application...
An FPGA-based approach is proposed for implementing a compression system developed specifically for the signal of phonocardiogram. The compression method offers better rate and distorsion than standard audio compression techniques. Both the algorithm and the details on the solutions adopted for its implementation are presented in this paper.
Cardiac auscultation is, together with the electrocardiogram, the first basic analysis tool used to evaluate the functional state of the heart, as well as the first indicator used to submit the patient to a cardiologist. Nowadays there is great interest in the development of automatic systems capable of aiding the physician in the diagnosis of the heart condition by analyzing the sounds and murmurs...
Nowadays, the microelectronics market is characterized by an increasing complexity and integration, in particular in the field of application specific integrated circuits (ASICs) not only for digital but also for mixed-signal designs. The lack of a well defined methodology for analog synthesis, similar to the digital field means a serious drawback for analog and mixed signal design development. In...
A general purpose system for telediagnosis of the valvular condition of the heart by analysing the phonocardiographic (PCG) signals generated by the heart is presented in this article. The system includes two main parts: a processing stage and a compression stage. The first one is arranged as a modular hierarchical structure with different abstraction levels, and performs a complete analysis of the...
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