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Question
Why the singnal of wireless/Tv in db value? and why it is 
showing in minus(-)?
 Question Submitted By :: Electronics-Communications
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
Here db(logarithmic unit) stands for Decibel. In humans the
audible range of frequencies is usually said to be 20 Hz
(cycles per second) to 20 kHz (20,000 Hz). It may be harmful
for human ear if it exceeds that range.Hence the value of dB
is always -(minus).
 
Is This Answer Correct ?    17 Yes 6 No
Shivaleela
 
Answer
# 2
Very large and very small values in mathematics can be
mentioned by dB. dB is a logarithmic calculation that
normalizes the value of a factor.

- sign in the value of a signal is because of noting that
the signal is incoming to the antenna (received signal) not
the transmitted one!
 
Is This Answer Correct ?    0 Yes 0 No
Reza R
 
 
 
Answer
# 3
The decibel ( dB) is used to measure sound level, but it is also widely used in electronics, signals and communication. The dB is a logarithmic unit used to describe a ratio or it is the unit of sound.
its value is showing in minus(-) because mathematically we take antilog of the value of sound/noise
 
Is This Answer Correct ?    0 Yes 0 No
Kashmir Singh
 
Answer
# 4
db is the unit for electromagnetic signal power
and (- )sign indicates that the power of the signal is too week
i.e in minus side
a lots of amplification stages are needed to make it useful
 
Is This Answer Correct ?    1 Yes 4 No
King
 

 
 
 
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