Analog and digital signals (for Modulation Transmission) are different
types which are mainly used to carry the data from one apparatus to another.
Analog signals are continuous wave signals that change with time
period whereas digital is a discrete signal is a nature. The main difference
between analog and digital signals is, analog signals are represented
with the sine waves whereas digital signals are represented with square waves.
Let us discuss some dissimilarity of analog & digital signals. The best
example of an analog and digital is electrons because it deals with analog as
well as digital signals, input & outputs. In some way, an electronics project mainly interacts by the real
analog world whereas digital signals with computers, microprocessors, and logic
units. These two kinds of signals are similar to different electronic
languages. As some of the other languages can only recognize as well as speak
one of the two. This article discusses an overview of both analog as well as
digital signals, and comparison between them.
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What is Analog and Digital Signal?
An analog signal is
one type of continuous time-varying signals, and these are classified into composite
and simple signals. A simple type of analog signal is nothing but a sine wave,
and that can’t be decomposed, whereas a composite type analog signal can be
decomposed into numerous sine waves. An analog signal can be defined by using
amplitude, time period otherwise frequency, & phase. Amplitude streaks the
highest height of the signal, frequency streaks the rate at which an analog
signal is varying, and phase streaks the signal position with respect to time
nothing. An analog signal is not resistant toward the noise, therefore; it
faces distortion as well as reduces the transmission quality. The analog signal
value range cannot be fixed.
Analog Signal
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Similar to analog,
digital signals carry the data although it is a bit different. These signals
are discrete or not continuous. A digital signal carries the data in the form
of binary because it signifies in the bits. These signals can be decomposed
into sine waves which are termed as harmonics. Every digital signal has
amplitude, frequency, & phase like the analog signal. This signal can be
defined by bit interval as well as bit rate. Here, bit interval in nothing but
the required time for transmitting an only bit, whereas the bit rate is bit
interval frequency.
Digital Signal
Digital signals are more resistant
toward the noise; therefore, it barely faces some distortion. These waves are
simple in transmitting as well as more dependable while contrasted to analog
waves. Digital signals include a limited variety of values which lies among
0-to-1.
Characteristics of
Analog and Digital Signals
The analog and
Digital signal characteristics mainly include adaptability, continuity,
representation, data type, signal type, medium of transmission, type of values,
security, bandwidth, hardware, data storage, portability, data transmission,
impedance, power consumption, recording data, use, rate of data transmission,
examples and applications.
Adaptability
Analog signals are less adjustable for a
range of use, whereas digital signals are more adjustable for a range of use.
Continuity
Analog signals use a continuous variety of
amplitude values whereas digital signal takes a limited set of distinct values
at consistently spaced spots in the time.
Type of Data
Analog signals are continuous in nature,
whereas digital signals are discrete.
Type of Waves
Analog signal wave type is sinusoidal,
whereas a digital signal is a square wave.
Medium of Transmission
Analog signal medium of transmission is wire
or wireless, whereas a digital signal is a wire.
Type of Values
Analog signal value type if positive as well
as negative, whereas a digital signal is positive.
Security
The
security of an analog signal is not encrypted, whereas a digital signal is
encrypted.
Bandwidth
The analog signal bandwidth is low, whereas
the digital signal is high.
Hardware
Analog signal hardware is not elastic,
whereas digital is elastic in execution
Data Storage
The data storage of an analog signal is in
the wave signal form, whereas digital signal stores the data in the binary bit
form.
Portability
Analog signals are portable similar to the
thermometer and low cost, whereas digital signals are portable similar to computers
and expensive.
Data transmission
In analog, the signal can be deterioration
due to noise throughout transmission, whereas digital signal can be noise
resistant throughout transmission devoid of any deterioration.
Impedance
The impedance of the analog signal is low,
whereas the digital signal is high.
Power Consumption
Analog devices use
more power, whereas digital devices use less power.
Data Transmission Rate
The data transmission
rate in the analog signal is slow, whereas in the digital signal it is faster.
Examples
The best examples of
the analog signal are video, human voice in the air, radio transmission waves
or TV transmission waves.
Applications
Analog signals can be
utilized in analog devices exclusively, thermometer, whereas digital signals
are appropriate for digital electronic devices like computers, PDA, cell
phones.
Key Differences
between Analog and Digital Signals
The key difference between analog and digital signals in
tabular form is shown below.
Analog Signal
|
Digital Signal
|
An analog signal signifies a continuous signal that keeps changes with a
time period.
|
A digital signal signifies a discrete signal that carries binary data
and has discrete values.
|
Analog signals are continuous sine waves
|
Digital signal is square waves.
|
Analog signals describe the behavior of the wave with respect to
amplitude, time period, & phase of the signal.
|
Digital signals describe the behavior of the signal with respect to the
rate of a bit as well as bit interval.
|
Analog signal range will not be set.
|
Digital signal is limited as well as ranges from 0 to 1.
|
Analog signal is further horizontal toward distortion during the
response to noise
|
A digital signal has resistance in response toward the noise, therefore,
it does not often face distortion.
|
An analog signal broadcasts the information in the signal form.
|
A digital signal broadcasts the information in the form of binary that
is bits.
|
The example of an analog signal is the human voice
|
The example of a digital signal is the data transmission in a computer.
|
Advantages of Digital Signal Over Analog Signal
There are several
advantages using digital signal over an analog signal.
·
Digital signals are more secure, and
they do not get damaged by noise.
·
These signals use low bandwidth
·
They allow the signals transmitted
over a lengthy distance.
·
Digital signal has a higher rate
transmission
·
By using these signals, we can
translate the messages, audio, video into device language.
·
Digital signals enable the
transmission of multidirectional concurrently.
Thus, the difference between analog and digital signal in tabular form is
shown above. The combination of analog and digital components is not rare to
observe in a circuit. Usually, microcontrollers are digital beasts, and they
have interior circuitry frequently which allows them to connect with analog
circuitry. An ADC (analog to digital converter) permits a
microcontroller to connect an analog sensor to read analog voltage. The fewer
general DAC permits a microcontroller for generating analog voltages, which is
useful whenever it requires making the sound. Here is a question for you, which is a better signal? analog or digital signal?
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CONTACT US
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Tel : +86 0755 26909863
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Source: elprocus
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