Dsip introduction
-
Upload
raveendra-tudangil -
Category
Engineering
-
view
72 -
download
5
Transcript of Dsip introduction
IntroductionChapter 1
Outline• Signal
• System
• Signal Processing
Signal• A signal is defined as any physical quantity that varies
with time, space or any other independent variable or variables.
• Mathematically, we can describe signal as a function of one or more independent variables.
S1(t)=5t.
S2(t)=20t2.
S3(x,y)=3x+2xy+10y2.
• Examples of natural signals are speech signals, electrocardiogram (ECG), electroencephalogram (EEG) etc.
System• A system is a physical device or an algorithm which performs required
operation on a signal.• A filter used to reduce the noise and interference corrupting a desired
information-bearing signal.
• Natural signals are also generated by some system.
• Speech signals are generated by forcing air through the vocal cord; i.e. the system consists of vocal cord and vocal tract called the vocal cavity.
• Images are obtained by exposing photographic film to a scene or an object.
• Thus signal generation is usually associated with a system that responds to a stimulus or force.
• The stimulus in combination with the system is called the signal source.
Signal Processing• The operations that are performed on a signal by a
system is referred to as signal processing.• Filtering