| 摘要 |
<p>A signal processor which acquires a first signal (Sμa), including a first desired signal portion (Yμa) and a first undesired signal portion (nμa), and a second signal (Sμb), including a second desired signal portion (Yμb) and a second undesired signal portion (nμb), wherein the first and second desired signal portions are correlated. The processor (26) of the present invention generates a noise reference signal (n'(t)) which is a combination of only the undesired signal portions and is correlated to both the first and second undesired signal portions. The noise reference signal (n'(t)) is then used to remove the undesired portion of each of the first and second measured signals via an adaptive noise canceler (27), preferably of the joint process estimator type. The processor (26) may be employed in conjunction with an adaptive noise canceler (27) in physiological monitors (20) wherein the known properties of energy attenuation through a medium are used to determine physiological characteristics of the medium.</p> |
