L12-ADDA-2009 - From Analog to Digital Trac D. Tran ECE...

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1 From Analog to Digital From Analog to Digital Trac D. Tran ECE Department The Johns Hopkins University Baltimore, MD 21218 Outline Outline Analog and digital: overview Applications of digital signal processing (DSP) systems Continuous-time and discrete-time signal processing Analog technology Gramophone, phonograph, cassette tape, VCR Sampling Analog-to-Digital converter (ADC) Aliasing error Nyquist sampling rate – Shannon sampling theorem Practical ADC issues Digital technology CD, DVD, blu-ray, MP3
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2 DSP Applications DSP Applications Radar & sonar signal processing, navigation, missile guidance, remote sensing, automatic target recognition Military Instrumentation Robot, computer/printer, engine, numerical control Control Systems Image enhancement, compression, HDTV, DirecTV, animation, pattern recognition Image Processing Magnetic resonance imaging (MRI), ultrasound imaging, hearing aids, patient monitoring Medical Engine control, antilock braking system, airbag control, system diagnosis, active suspension Automotive Voice mail, speaker recognition & verification, speech synthesis, speech coding Cellular phones, modems, fax machines, answering machines, speaker phones Telecommunications Specific Uses of DSP Systems Field Analog Technology: Gramophone Analog Technology: Gramophone Thomas Edison’s phonograph 1877 Voice etched directly onto a tinfoil cylinder Gramophone 1887 Voice etched onto a flat record with a spiral groove Modern phonograph, turntable with vinyl records, LPs Same principle
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3 Analog Technology: Cassette Tape Analog Technology: Cassette Tape Philips 1963 Analog audio signals etched onto magnetic tape Similar technology to computer hard-drive & floppy disk Popular in 1970-1990 Transitional period from LP to CD Sony Walkman 1980s Analog version of the
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This note was uploaded on 02/02/2010 for the course ENGINEERIN 520.101 taught by Professor Tracdtran during the Winter '06 term at Johns Hopkins.

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L12-ADDA-2009 - From Analog to Digital Trac D. Tran ECE...

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