Estimation of analogue pre-filtering characteristics for CORSA standardisation

Article type: Research Article

Authors: Sun, X.Q.^a | Cheetham, B.M.G.^{a; *} | Evans, K.G.^a | Earis, J.E.^b

Affiliations: [a] Department of Electrical Engineering and Electronics, Liverpool University, Liverpool L69 3BX, UK | [b] Aintree Chest Centre, Fazakerley Hospital, Liverpool, UK

Correspondence: [*] Correspondence: Barry M.G. Cheetham, Department Electrical Engineering and Electronics, Liverpool University, Brownlow Hill, Liverpool L69 3BX, UK. Tel.: +44 151 794 4509; Fax: +44 151 794 4540; E-mail: [email protected].

Abstract: This paper is concerned with devising a standard procedure for determining the gain and phase responses of the analogue filters used to pre-process pulmonary signals prior to their digitisation. The customary high-pass filtering, in particular, will strongly affect the time-domain wave-shapes of digitised signals and this must be taken into account when analysing the signals. Several means of determining the effect of the high-pass filtering are investigated and a measurement procedure is proposed which may be easily carried out using simple laboratory equipment.

DOI: 10.3233/THC-1998-6407

Journal: Technology and Health Care, vol. 6, no. 4, pp. 275-283, 1998