Biosignal and medical image processing. MATLAB based - download pdf or read online

By John L. Semmlow

Depending seriously on MATLAB® difficulties and examples, in addition to simulated facts, this text/reference surveys an unlimited array of sign and photograph processing instruments for biomedical functions, supplying a operating wisdom of the applied sciences addressed whereas showcasing invaluable implementation systems, universal pitfalls, and crucial program thoughts. the 1st and in basic terms textbook to provide a hands-on instructional in biomedical sign and photo processing, it bargains a distinct and confirmed method of sign processing guide, not like the other competing resource at the subject. The textual content is followed via a CD with aid info documents and software program together with all MATLAB examples and figures present in the text.

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Filter Types Analog filters are electronic devices that remove selected frequencies. Filters are usually termed according to the range of frequencies they do not suppress. Thus, lowpass filters allow low frequencies to pass with minimum attenuation while higher frequencies are attenuated. Conversely, highpass filters pass high frequencies, but attenuate low frequencies. Bandpass filters reject frequencies above and below a passband region. An exception to this terminology is the bandstop filter, which passes frequencies on either side of a range of attenuated frequencies.

TLFeBOOK Introduction 13 analog-to-digital conversion (ADC). It is this filtering that usually establishes the bandwidth of the system for noise calculations [the bandwidth used in Eqs. (2)–(4)]. As shown later, accurate conversion of the analog signal to digital format requires that the signal contain frequencies no greater than 1⁄2 the sampling frequency. This rule applies to the analog waveform as a whole, not just the signal of interest. Since all transducers and electronics produce some noise and since this noise contains a wide range of frequencies, analog lowpass filtering is usually essential to limit the bandwidth of the waveform to be converted.

Different approaches can be used to implement the conversion electronically; the most common is the successive approximation technique described at the end of this section. ADC’s differ in conversion range, speed of conversion, and resolution. The range of analog voltages that can be converted is frequently software selectable, and may, or may not, include negative voltages. 0 volts or less. The speed of conversion is specified in terms of samples per second, or conversion time. For example, an ADC with a conversion time of 10 µsec should, logically, be able to operate at up to 100,000 samples per second (or simply 100 kHz).

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