113D_1_EE113D_CR2_C54xPgmg

113D_1_EE113D_CR2_C54xPgmg - Digital versus Analog Signal...

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Digital versus Ana log Signal Processing The advantages of using digital signal processing over analog signal processing are: 1) Less expensive, and often fewer components 2) More reliable and deterministic performance 3) More flexible and easy adjustable by reprogramming 4) Higher precision (the more bits you use to represent signals, the higher accuracy you get) 5) Higher noise immunity 6) Wider range of applications (like ada ptive signal processing) , The dis-advantages of using digital signal processing over analog signal processing are: 1) Limited ban dwidth (to prevent aliasing bandwidth is limited to folding frequency F s/2 ) 2) Quantization of signals is necessary (and can be considered as an additional noise source) 3) Due to quantization and overflow a st able system can become unstable and create oscil- la ti ons (which are called limit cycles and overflow oscilla ti ons, respectively) Hardware versus Software Digital Signal Processing Implementation 1) DSP chip is less expensive tha n a CPU . 2) DSP is simpler and it can run faster. 3) DSP can perf orm real-time signal processing in applications upto higher frequencies. 4) DSP has higher amount of parallelism. 3 25
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Applications Typical digital signal processing tasks are: 1) ~igital filterin.g: Finite Imp~lse Response (FIR) and Recursive (IIR) digital filtering 2) Signal processing: Compression, Expansion, Averaging 3) Data Processing: Encrypting/Scrambling, Encoding, Decoding 4) Numeric Processing: Scaler, vector and matrix arithmetic, functional computations 5) Modulation: Amplitude , Frequency, Phas e 6) Spectral Analysis: Fas~ Fourier Transform (FFT ), Discrete Fourier Transform (DFT ) Table 1- 1. Typical Applications for the TMS320DSPs Automotive Adaptive ride control Antiskid brakes Cellular telephones Digital radios Engine control Navigation and global positioning Vibration analysis Voice commands Anticollision radar General-Purpose Adaptive filtering Convolution Correlation Digital filtering Fast Fourier transforms Hilbert transforms Waveform generation Windowing Instrumentation Digital filtering Function generation Pattern matching Phase-locked loops Seismic processing Spectrum analysis Transient analysis Consumer Digital radioslTVs Educational toys Music synthesizers Pagers Power tools Radar detectors Solid-state answering machines Graphlcsllmaglng 3-D rotation Animation/digital maps Homomorphic processing Image compressionltransmission Image enhancement Pattern recognition Robot vision Workstations Medical Diagnostic equipment Fetal monitoring Hearing aids Patient monitoring Prosthetics Ultrasound equipment Control Disk drive control Engine control las er printer control Motor control Robotics control Servo control Industrial Numeric control Power-line monitoring Robotics Security access MUllary Image processing Missile guidance Navigation Radar processing Radio frequency modems Secure communications Sonar processing Telecommunications VolcelSpeech 1200- to 33 600-bps mode ms Adaptive equalizers ADPCM transcoders Cellular telephones Channel multiplexing
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