313lecture1 - Introduction Prof. Adnan Kavak Dept. of...

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Unformatted text preview: Introduction Prof. Adnan Kavak Dept. of Electrical and Computer Engineering The University of Texas at Austin EE 313 Linear Systems and Signals Fall 2008 Adapted from Originals with Courtesy of Prof. Brian Evans 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 • 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? Moving Picture Experts Group (MPEG) Joint Picture Experts Group (JPEG) 1-5 Communication Systems • Voiceband modems (56k), cable modems • Digital subscriber line (DSL) ISDN: 144 kilobits per second (kbps) Symmetric: High-speed DSL Asymmetric: Asymmetric DSL and Very High- Speed DSL • Cellular phones First generation (1G): AMPS Second generation (2G): Global System for Mobile (GSM) and Interim Standard-95 (Code Division Multiple Access) Integrated Digital Services Network (ISDN) 1-6...
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This note was uploaded on 02/10/2009 for the course EE 313 taught by Professor Cardwell during the Spring '07 term at University of Texas at Austin.

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313lecture1 - Introduction Prof. Adnan Kavak Dept. of...

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