Analog Modulation vs. Digital Modulation
Modulation is the process of modifying one signal based
on another, and it is used mostly in the transmission of data from one point to
another. Although there are many types of modulation, there are two basic types:
analog modulation and digital modulation. The main difference between analogmodulation and digital modulation is in the manner that they transmit data.
With analog modulation, the input needs to be in the analog format, while
digital modulation needs the data in a digital format.
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Because of the differences in the input signal, the
output signal is also quite different. In analog modulation, any value between
the maximum and minimum is considered to be valid. It is not so with digital
modulation as only two values are considered valid; one value to represent “1”
and another to represent “0.” All other values are considered noise and are
rejected.
Because most signals that we transmit are analog in
nature, like one’s voice, it is far simpler to do analog modulation than
digital. If you want to transmit a voice using digital modulation, you’d need
to pass it through an analog-to-digital converter before transmission and a
digital-to-analog converter at the receiver to recover the original signal. The
additional stages needed for transmitting digital modulation increases both the
cost and complexity of the transmitter and receiver.
The major advantage that digital modulation has over
analog transmission is how it achieves greater fidelity. With analog
modulation, any noise or interference that falls in the given frequency
bandwidth gets mixed with the actual signal. Although there are a number of
ways to mitigate noise, it will still cause some amount of degradation. Because
digital modulation only recognizes 0’s and 1’s, any noise is virtually
eliminated once the receiver discerns whether a “0” or a “1” was transmitted.
Unless the signal is very badly distorted, the output signal will be literally
identical to what was transmitted.
Under both analog modulation and digital modulation,
there are a number of other modulation techniques each with its own strengths
and weaknesses. But each technique has its basic commonalities of transmitting
either a digital or analog signal.
Summary:
1. Analog modulation takes an analog signal while digital
modulation takes a digital signal.
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2. Analog modulation has a range of valid values while digital modulation only
has two.
3. Analog modulation is cheaper to implement than digital modulation.
4. Digital modulation produces more accurate output than analog modulation.
3. Analog modulation is cheaper to implement than digital modulation.
4. Digital modulation produces more accurate output than analog modulation.
Difference
between Analog and Digital Signals
Analog vs. Digital Signals
There are two types of signals that carry information –
analog and digital signals. The difference between analog and digital signals
is that analog is a continuous electrical signal, whereas digital is a
non-continuous electrical signal.
Analog Signals vary in time, and the variations follow
that of the non-electric signal. When compared to analog signals, digital
signals change in individual steps and consist of pulses or digits. Analog
signals are a model of the real quantity and the voice intensification
that causes electric current variations. Digital signals have discrete levels,
and the specified value of the pulse remains constant until the change in the
next digit. There are two amplitude levels, which are called nodes, which are
based on 1 or 0, true or false, and high or low.
Digital signals, similar to Morse code, are sent to
a computer which
interprets these into words. A digital signal, a 0 or 1, is sent through the
phone line. For example, when you type the letter A into your computer, it
converts it into 01000001. This 01000001 goes to other computer, which
interprets it as A. A series of eight 0’s and 1’s is called a byte, whereas
each 0 or 1 is called a bit.
The difference between digital and analog signals can
also be understood by observing various examples of different waves, and how
they work. In the 1800’s, analog waveforms were used in conjunction with copper to
relay or transmit conversations. Since they have the tendency to catch
distorting electromagnetic waves, or noise which drops the quality of the
signal, they soon became troublesome and difficult to maintain. Soon the change
from analog to digital occurred, because digital signals were easier to
transmit and were more reliable compared to analog signals.
A signal is the transmission of data that
we constantly deal with during our daily routine life. From telephones to
cellular devices, and music to computers, signals are very important. With the
advent of modern technology, telephone and computers etc. have become a
necessity, and the cost of analog signal transmission has become not only
expensive, but troublesome. Digital signals soon replaced analog because they
are simply different and uniformed, and not severely altered by noise or
distortion. Almost all electronic devices use digital signals, because they
remain accurate in shape and amplitude. Digital signals provide better
continuous delivery, and are preferred over analog signals.
Summary:
1. Analog signals can be converted into digital signals
by using a modem.
2. Digital signals use binary values to
send and receive data between computers.
3. Digital signals are easier and more reliable to
transmit with fewer errors.
4. Analog signal are replicas of sound waves that can be
distorted with noise and drop the quality of transmission.
5. Digital data has a faster rate of transmission when
compared to analog, and gives better productivity.
Difference
between Analog and Digital Transmission
Analog vs. Digital Transmission
Analog transmission is a method of conveying voice, data,
image, signal, or video information. It uses a continuous signal varying in
amplitude, phase, or another property that is in proportion to a specific
characteristic of a variable. Analog transmission could mean that the
transmission is a transfer of an analog source signal which uses an analog
modulation method (or a variance of one or more properties of high frequency
periodic waveform, also known as a carrier signal). FM and AM are examples of
such a modulation. The transmission could also use no modulation at all. It is
most notably an information signal
that is constantly varying.
Data transmission (also known as digital transmission or
digital communications) is a literal transfer of data over
a point to point (or point to multipoint) transmission medium –such as copper wires,
optical fibers, wireless communications media, or storage media. The data that
is to be transferred is often represented as an electro-magnetic signal (such
as a microwave). Digital transmission transfers messages discretely. These
messages are represented by a sequence of pulses via a line code. However,
these messages can also be represented by a limited set of wave forms that
always vary. Either way, they are represented using a digital modulation
method.
Analog transmission is capable of being conveyed in a no
fewer than four ways: through a twisted pair or coax cable, through a fiber
optic cable, through the air, or through water. There are, however, only two
basic types of analog transmission. The first is known as amplitude modulation
(or AM). This is a technique used in electronic communication and works by
alternating the strength of a transmitted signal in relation to the information that
is being sent. The second is known as frequency modulation (or FM). This type
of communication conveys information over a carrier wave, just as AM
transmission. However, FM communication alternates the frequency of the
transmitted signal.
Data that is transmitted via digital transmission may be
digital messages that have origins for a data source (a computer or
a keyboard, for example). However, this transmitted data may also be from an
analog signal (a phone call or a video signal, for example). It may then be
digitized into a bit stream using pulse code modulation (or PCM) –or even more
advanced source coding schemes. The coding of the data is carried out using
codec equipment.
Summary:
1. Analog transmission conveys voice, data, image, signal, or video information using an information signal that is continuously varying; digital transmission transfers data over a transmission medium discretely.
2. Analog transmission can be conveyed in four ways: a twisted pair or coax cable, a fiber optic cable, the air, or water; digital transmission may be transmitted via an electro-magnetic signal, such as a microwave.
1. Analog transmission conveys voice, data, image, signal, or video information using an information signal that is continuously varying; digital transmission transfers data over a transmission medium discretely.
2. Analog transmission can be conveyed in four ways: a twisted pair or coax cable, a fiber optic cable, the air, or water; digital transmission may be transmitted via an electro-magnetic signal, such as a microwave.
Difference
between Analog and Digital
Analog vs. Digital
Technologically speaking analog and digital are two kinds of processes
used for the transmission of any  electric signals. A Usually the
information which transformed into electric signal is either audio or video.
This is done via the translation of any information into different types of
electric signals. For the analog format, the translation of data is in electric
pulses  which varies in amplitude while for the digital format, the
translation of data is in the binary format with two distinct amplitudes
represent each bit.
Devices come with built-in ‘translation’ facilities so
you have equipment like analog or digital phones, fax machines, modems, clocks,
watches etc. A microphone and speaker are good examples for analog devices.
Analog technology is older and has been used for decades.
It is cheap too but the problem with analog signals is that there is a
limitation on the size of the data that can be transmitted at any given point
of time.
Digital technology has changed how most of our equipment
works. It changes all data into binary code at the point of transmission and
this binary code is reassembled back into data as original at the reception
point of the transmission. Since digital signals can be manipulated by software,
it gives you way more options than an analog one. In telecommunication, as
compared to analog signals since digital signals have an original blueprint
that has to be replicated at the conclusion point of the transmission, it is
more accurate and clear.
However, another difference between the digital and
analog technology is that of quality. Since digital devices are translating and
reassembling data, the quality is not that good. Â But advancement in
computing technology allows to artificially remove possible errors and
disturbances in  any digital signals. Digital is still quite expensive as
compared to the analog one. Global technology giants are working on reducing
the price though.
The most efficient use of the digital technology has been
realized in the cellular phone industry with analog becoming redundant though
the sound quality is better in the latter. It can be said that all natural
signals are analog. For instance when human speech is transformed directly to
electric signals it is an analog signal. But converting it to digital format
opens up an endless possibility of usage, Â like a simple act of saving
that in a computer.
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