lecture1 - Introduction Prof. Brian L. Evans Dept. of...

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Unformatted text preview: Introduction Prof. Brian L. Evans Dept. of Electrical and Computer Engineering The University of Texas at Austin EE 313 Linear Systems and Signals Spring 2009 Initial conversion of content to PowerPoint by Dr. Wade C. Schwartzkopf 1-2 Audio CD Samples at 44.1 kHz Human hearing is from about 20 Hz to 20 kHz Sampling theorem (covered last week of class): sample analog signal at a rate of more than twice the highest frequency in the analog signal Apply a filter to pass frequencies up to 20 kHz (called a lowpass filter) and reject high frequencies, e.g. a coffee filter passes water through but not coffee grounds Lowpass filter needs 10% of cutoff frequency to roll off to zero (filter can reject frequencies above 22 kHz) Sampling at 44.1 kHz captures analog frequencies of up to but not including 22.05 kHz. 1-3 Coverage of Course Analysis of linear subsystems within control, communication, and signal processing systems Examples of electronic control systems? Antilock brakes Engine control Chemical processing plant Emerging trend: brake by wire Examples of signal processing systems? 1-4 Signal Processing Systems Speech and audio Speech synthesis and recognition Audio CD players Audio compression: AC3, MPEG 1 layer 3 audio (MP3) Image and video compression Image compression: JPEG, JPEG 2000 Video CDs: MPEG 1 DVD, digital cable, HDTV: MPEG 2 Wireless video: MPEG 4/H.263, MPEG 4 Advanced Video Coding/H.264 Examples of communication systems?...
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lecture1 - Introduction Prof. Brian L. Evans Dept. of...

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