Filtro Rechazabanda Con Parametros Variantes En El Tiempo Con Mecanismo De Entonación Para La Adquisición De Señales Electrocardiograficas Sujetas A Interferencia De Línea (Parameter-Varying Notch Filter With Tunning Mechanism For The Acquisition Of Electrocardiographic Signals Subject To Powerline Interference)

Isabelo Meza Dector (imeza@inaoep.mx), Miguel Ángel Gutiérrez de Anda (mdeanda@inaoep.mx)


Instituto Nacional de Astrofísica Óptica y Electrónica
This paper appears in: Revista IEEE América Latina

Publication Date: April 2015
Volume: 13,   Issue: 4 
ISSN: 1548-0992


Abstract:
Power line interference is a common problem in the acquisition of electrocardiographic signals. Different techniques have been used in order to cancel power line interference such as adaptive filters with a high quality factor. Each of these techniques have been specific disadvantages such as large transient response or the inability to track changes in the frequency of the power line interference for its removal. In this article, an alternative filtering method is presented. This method is capable to track deviations of the frequency associated to the power line interference, keeping a narrow stop band with a reduced transient response. The filtering strategy was implemented with the aid of a chpKIT max32 as a discrete-time system. Measurements results confirm the adequate operation of the proposed discrete-time filter

Index Terms:
discrete-time filter, notch filter, parameter-varying filter, transient response   


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