DSP (digital signal processing)
description
Transcript of DSP (digital signal processing)
DSP (digital signal processing)(DSP) deals with commonly signals
such as speech, music, video, EKG or ECG (heart), and EEG (brain).
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
Preparing the analog signal for communication through a communication channel
Analyzing the analog signal for use in a voice recognition telephone system.
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.
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
Analog-To-Digital convertor
• Sampler• Quantization• Coding.
Sampler Quantizes Codes
Discrete time signal Digital signal
Quantized signal Analog signal
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
The sampling theorem introduced by Nyquist and later by Shannon is used to determine the appropriate sampling rate
Fs≥2Fmax