AN EXPERIMENTAL SINGLE-SIDE-BAND ACOUSTICAL REINJECTION TEST METHOD FOR DOPPLER SYSTEMS

Authors
WALLACE JJA MARTIN K WHITTINGHAM TA
Citation
Jja. Wallace et al., AN EXPERIMENTAL SINGLE-SIDE-BAND ACOUSTICAL REINJECTION TEST METHOD FOR DOPPLER SYSTEMS, Physiological measurement, 14(4), 1993, pp. 479-484
Citations number
3
Categorie Soggetti
Biophysics,"Engineering, Biomedical",Physiology
Journal title
Physiological measurement → ACNP
ISSN journal
09673334
Volume
14
Issue
4
Year of publication
1993
Pages
479 - 484
Database
ISI
SICI code
0967-3334(1993)14:4<479:AESART>2.0.ZU;2-4
Abstract
An experimental acoustical re-injection system based on a wideband sin gle-sideband generator has been developed. This has been used to prese nt a clinical Doppler system with a simulated Doppler shift, as would be obtained from a unidirectional moving reflector. Development of thi s approach should permit independent electronic testing of forward and reverse channels, including mean and peak frequency calculations and measurement of channel separation. Sideband suppression of 28 dB minim um has been obtained for a range of ultrasound frequencies from 2.5 MH z to 10 MHz and audio frequency shifts up to 10 kHz.