An analog signal is a signal that is continuous in
time and amplitude that is a signal that is an analog signal is an electric
signal with continuously varying amplitude
Uses continuous range of values to represent
Stored in the form of wave signals
Analog signal can have infinite number of values and
varies continuously with time.
Analog signal is usually represented by sine wave
A digital signal refers to an electrical signal that
is converted into a pattern of bits, it’s a signal that assumes a definite
Digital signals are stored in form of binary bits.
They assume definite values
The transition of a digital signal from one value to
other value is instantaneous.
Digital signals are represented by square wave
CONVERTING ANALOG VOICE SIGNALS TO DIGITAL VOICE
easier for storage since they are resistant to
corruption as compared to the analog,
strong immunity to noise because as compared to the
analog signals digital signals do not need amplifiers, that is, when
transmitting analog signals over a long distance, they need amplifiers which in
the process noise picked up by the signal on the way may also be amplified
which does not happen in the digital signals because they just need to be
reconstructed and retransmitted because they are definite,
parallel processing possibility, multiple messages can
also be evaluated simultaneously which therefore saves time.
error correction, digital instruments are free from
observational errors like parallax and approximation errors possibilities due
to the fact that the signals are definite.
The installation process is relatively cheaper.
They are reliable since the devices are available on a
wide range by many people.
Digital data can be compressed relatively easily,
thereby increasing the efficiency of transmission
They are relatively easy to upgrade. Such upgrading
can increase bandwidth, reduces the incidence of error
CONNECTION OF ANALOG SIGNALLLS FROM A TRANSMITTER TO A
Input transducer: The device that converts a physical
signal from source to an electrical signal Transmitter: The device that sends
the transduced signal the transmitter also contains the modulator
Through the optical fibers as Transmission channel:
The physical medium on which the signal is carried
Receiver: The device that recovers the transmitted
signal from the channel, the demodulator is also contained in the receiver.
Output transducer: The device that converts the received
signal back into a useful quantity
DIGITAL SIGNALS COUPLED FROM A CODER TO A DECODER.
The process of communication begins with the source.
When the source of the communication puts together
their intended message, this is referred to as ‘Encoding’. ‘Encoding’ can be
defined as transforming an abstract idea into a communicable message. This is
done using words, symbols, pictures, symbols and sounds.
The encoded message must now be delivered to its
audience via a message channel. A message channel is a term that refers to the
medium that carries the message from the sender to the receiver.
Anyone who is audience to the message is referred to
as the receiver.
Decoding which is done by the decoder
When the receiver views or hears the message, they do
what is termed ‘decoding’. Decoding can be defined at the receiver interpreting
the message and coming to an understanding about what the source is
Response, could be a communication in turn or a