IIR Filter design in digital signal processing

IIR Filter design

Concept of filter design:

"Analog filters are designed using analog components like resistors (R), inductance (L) and capacitors (C).while digital filters are implemented using difference equations& can be done using C or assembly language we can easily change the algorithm so we can easily change the filter characteristics according to our requirement".

Basically there are 2 types of filters as follows:

1.FIR (Finite impulse response)Filter
2.IIR (Infinite impulse response)Filter

We will study each type in detail later in this chapter.Presently we will compare analog and digital filters by studying advantages and disadvantages of digital filters.

Advantage of Digital Filter:

1.Many inputs can be filtered without change in Hardware.
2.Characteristics are like linear phase response which is impossible to obtain in analog filters.
3.performance dose not vary with parameters of environmental conditions which can cause problems in analog filters .
4.Portable.
5.Highly Flexible.
6.Repeatable.
7.can be used at very low frequencies ex. for Biomedical signals.
8. Maintenance is not required .

Disadvantages of Digital filters:

1.Speed Limitation.

2.Finite word length effect.

3.Long design and development time.

Multiplexing and Multiple Access

Multiplexing And Multiple Access : Digital Communications Difference between Multiplexing and Multiple Access: Sr.No. Multiplexing Multiple Access 1 “In telecommunications and computer networks, multiplexing is a process where multiple analog message signals or digital data streams are combined into one signal over a shared medium.” “In telecommunications and computer networks, a channel access method or multiple access method allows several terminals connected to the same multipoint physical medium to transmit over it and to share its capacity.” 2 The multiplexed signal is transmitted over a communication channel, which may be a physical transmission medium. A channel-access scheme is based on a multiplex method that allows several data streams or signals to share the same communication channel or physical media.

Difference in between Time division multiplexing (TDM) and Frequency division multiplexing (FDM)

Difference in between TDM and FDM: This page on FDM versus TDM describes difference between FDM and TDM multiplexing . FDM is the short form of frequency division multiplexing and TDM is the short form of time division multiplexing. In FDM each signal is modulated onto different unique RF carrier frequency and all carrier frequencies are separated significantly so that bandwidth of the signals do not overlap in frequency domain. Figure: Difference in between TDM and FDM

Comparison between armature controlled and field controlled DC servo motor

Comparison between armature controlled and field controlled DC servo motor : Field controlled DC servomotor Armature controlled DC servomotor 1. Field is excited by control voltage Armature is excited by control voltage 2. Armature current kept constant Field current kept constant 3. Required low power amplifiers are simple to design Required high power amplifiers 4. Efficiency is poor Efficiency is better 5. It has large time constant It has small time constant 6. Cost is low Cost is high 7. It is open loop system It is close loop system Comparison between ar

M&MA

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