dsp (digital signal processing) (dsp) deals with commonly signals such as speech, music, video, ekg...
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DSP (digital signal processing)
(DSP) deals with commonly signals such as speech, music, video, EKG or
ECG (heart), and EEG (brain).
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Applications of DSP
Signal transmission /storage/retrieval Information extraction
Speech coding , music coding, data compression
communication over noisy channels
Radar and sonar signal processing
Speech ,image and character recognition
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Preparing the analog signal for communication through a communication channel
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Analyzing the analog signal for use in a voice recognition telephone system.
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DSP block diagram
SIGNALS, SYSTEMS, AND SIGNAL PROCESSINGA signal is defined as any physical quantity that vary with time or any independent variablesA system may also be defined as a physical device that performs an operation on a signalA Signal processing is the operations that performed on the signal means processed the signal.
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Classification of signals:-
• Multi channel and multi dimension signals• Continuous Time versus Discrete Time Signal• Continuous – Valued versus Discrete – Valued
Signals• Deterministic signal and Random signal
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Analog-To-Digital convertor
• Sampler• Quantization• Coding.
Sampler Quantizes Codes
Discrete time signal Digital signal
Quantized signal Analog signal
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Sampling of analog signal
This is the conversion of a continuous-time signal into
discrete-time signal obtained by taking samples of the
continuous-time signal at discrete-time instant
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The sampling theorem introduced by Nyquist and later by Shannon is used to determine the appropriate sampling rate
Fs≥2Fmax
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