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
Speech coding ,
music coding, data
compression
communication
over
noisy
channels
Information extraction
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.
SIGNALS, SYSTEMS, AND SIGNAL PROCESSING
A signal is defined as any physical quantity that vary with time or
any independent variables
A system may also be defined as a physical device that performs an
operation on a signal
A Signal processing is the operations that performed on the signal
means processed the signal.
DSP block diagram
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.
Analog signal
Sampler
Discrete time
signal
Quantized signal
Quantizes
Codes
Digital 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