Encoding and decoding
analog and digital
signals
Encoding involves converting data
from its original form into another
form for transmission. Decoding is
the reverse proce...
Analog data is represented by
using continuous variable physical
quantities, such as voltages.
For example, a watch that displays
the time by hands moving
smoothly around the clock face is
an analog device.
Most natural events in the real
world, such as temperature, light
and pressure, are in analog form.
For example, a digital clock shows
the time as a certain number of
hours and minutes.
Digital data is represented in the
f...
Information technology works
with data in a digital form.
Digital signals are represented as a
series of 0s and 1s.
The form of the data (either
analog or digital) and the
transmission signal (either analog
or digital signal) affects the ...
The quality of analog data
depends on maintaining the exact
wave as it moves through a wire
or space. If it is corrupted i...
However, digital data is
transmitted as a series of 0s and
1s, and it is possible to regenerate
data that has been corrupt...
There are four encoding and
decoding possibilities in
transmission:
• Analog data to analog signal.
• Digital data to anal...
Information technology works
with data in a digital form.
Analog data to analog signal. The
wave shape of the data is encoded
into the signal. A telephone
encodes analog data in th...
Digital data to analog signal. A
series of 0s and 1s is encoded into
a continuous wave. A modem
encodes (or modulates) dig...
A modem encodes digital data to
analog signals and decodes analog
signals to digital data.
Analog data to digital signal—the
wave shape of the data is encoded
into a series of 0s and 1s. This
process of generating...
Images are digitised using such
devices as scanners, and sounds
are digitised using a process called
sampling.
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Encoding and Decoding

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Encoding and Decoding analog and digital signals

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Encoding and Decoding

  1. 1. Encoding and decoding analog and digital signals
  2. 2. Encoding involves converting data from its original form into another form for transmission. Decoding is the reverse process.
  3. 3. Analog data is represented by using continuous variable physical quantities, such as voltages.
  4. 4. For example, a watch that displays the time by hands moving smoothly around the clock face is an analog device.
  5. 5. Most natural events in the real world, such as temperature, light and pressure, are in analog form.
  6. 6. For example, a digital clock shows the time as a certain number of hours and minutes. Digital data is represented in the form of digits or numbers.
  7. 7. Information technology works with data in a digital form.
  8. 8. Digital signals are represented as a series of 0s and 1s.
  9. 9. The form of the data (either analog or digital) and the transmission signal (either analog or digital signal) affects the quality of the data received and the cost of transmission.
  10. 10. The quality of analog data depends on maintaining the exact wave as it moves through a wire or space. If it is corrupted in any way, there is no way of regenerating the wave.
  11. 11. However, digital data is transmitted as a series of 0s and 1s, and it is possible to regenerate data that has been corrupted. That is, to reconstruct the data, it is only necessary to distinguish between a 0 and a 1.
  12. 12. There are four encoding and decoding possibilities in transmission: • Analog data to analog signal. • Digital data to analog signal. • Digital data to digital signal. • Analog data to digital signal.
  13. 13. Information technology works with data in a digital form.
  14. 14. Analog data to analog signal. The wave shape of the data is encoded into the signal. A telephone encodes analog data in the form of sounds into analog signals suitable for the telephone line. If the signal is corrupted, there is no way of restoring the original analog data.
  15. 15. Digital data to analog signal. A series of 0s and 1s is encoded into a continuous wave. A modem encodes (or modulates) digital data from a computer into analog signals for the telephone line. When the analog signal is received by another modem, it decodes (or demodulates) the analog signal into digital data.
  16. 16. A modem encodes digital data to analog signals and decodes analog signals to digital data.
  17. 17. Analog data to digital signal—the wave shape of the data is encoded into a series of 0s and 1s. This process of generating digits or numbers is called digitising.
  18. 18. Images are digitised using such devices as scanners, and sounds are digitised using a process called sampling.
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