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Signals and systems: signal basics and DSP concepts

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1 is an area of science and engineering that has developed rapidly over the past 30 years. This rapid development is a result of the significant advances in digital computer technology and integrated-circuit fabrication.
1. ADigital signal processing
2. Bsignal processing
3. CDigital to analog processing
4. Danalog to digital processing
2Defined as any physical quantity that varies with time, space, or any other independent variable or variables?
1. Asignal
2. Bdigital
3. Canalog
3describe two signals, one that varies linearly with the independent variable / _______and a second that varies _________with t. As another example, consider the function
1. A(time) , quadratically
2. Bspace, time
3. Ctime