Read e-book online Biosignal and Biomedical Image Processing PDF

By John L. Semmlow

ISBN-10: 8002281160

ISBN-13: 9788002281160

A textbook for a one-semester path combining sign and photograph processing for graduate and complex undergraduate scholars in biomedical engineering. scholars are assumed to have a few wisdom of the MATLAB software program package deal.

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Extra resources for Biosignal and Biomedical Image Processing

Example text

11. The first element is an N-to-1 analog switch that allows multiple input channels to be converted. Typical ADC systems provide up to 8 to 16 channels, and the switching is usually softwareselectable. Since a single ADC is doing the conversion for all channels, the conversion rate for any given channel is reduced in proportion to the number of channels being converted. 25 kHz. The Sample and Hold is a high-speed switch that momentarily records the input signal, and retains that signal value at its output.

Note that simple truncation can be viewed as multiplying the function by a rectangular window, a function whose value is one for the portion of the function that is retained, and zero elsewhere. The consequences of this artificial shortening will depend on the specific window function used. Consequences of data windowing are discussed in Chapter 3 under the heading Window Functions. If a window function is used, Eq. (8) becomes: N X(m) = ∑ x(n) f (n) W(n) m (9) n=1 where W(n) is the window function.

Most ADC software packages provide a means for determining which element in an array has most recently been filled to facilitate buffering, and frequently the ability to determine which of two arrays (or which half of a single array) is being filled to facilitate double buffering. DATA BANKS With the advent of the World Wide Web it is not always necessary to go through the analog-to-digital conversion process to obtain digitized data of physiological signals. A number of data banks exist that provide physiological signals such as ECG, EEG, gait, and other common biosignals in digital form.

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Biosignal and Biomedical Image Processing by John L. Semmlow


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