Baseband communication is the simplest form of analog communication.
We use analog communication techniques for analog message
signals, like music, speech, and television. Transmission andreception of analog signals using analog results in an
inherently noisy received signal (assuming the channel addsnoise, which it almost certainly does).
The simplest form of analog communication is
baseband
communication .
We use analog communication
techniques for analog message signals, like music, speech, andtelevision. Transmission and reception of analog signals using
analog results in an inherently noisy received signal(assuming the channel adds noise, which it almost certainly
does).
Here, the transmitted signal equals the message times a
transmitter gain.
An example, which is somewhat out of date, is the wireline
telephone system. You don't use baseband communication inwireless systems simply because low-frequency signals do not
radiate well. The receiver in a baseband system can't do muchmore than filter the received signal to remove out-of-band noise
(interference is small in wireline channels). Assuming thesignal occupies a bandwidth of
Hz (the signal's spectrum extends from zero to
), the receiver applies a lowpass
filter having the same bandwidth, as shown in
[link] .
The receiver for baseband communication systems is quite
simple: a lowpass filter having the same bandwidth as thesignal.
We use the
signal-to-noise ratio of the
receiver's output
to evaluate any analog-message communication system. Assume that
the channel introduces an attenuation
and white noise of
spectral height
. The filter does not affect the signal component—we
assume its gain is unity—but does filter the noise,removing frequency components above
Hz. In the filter's output, the
received signal power equals
and the noise power
,
which gives a signal-to-noise ratio of
The signal power
will be
proportional to the bandwidth
;
thus, in baseband communication the signal-to-noise ratio variesonly with transmitter gain and channel attenuation and noise
level.
Questions & Answers
A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance
Chemistry is a branch of science that deals with the study of matter,it composition,it structure and the changes it undergoes
Adjei
please, I'm a physics student and I need help in physics
Adjanou
chemistry could also be understood like the sexual attraction/repulsion of the male and female elements. the reaction varies depending on the energy differences of each given gender. + masculine -female.
Pedro
A ball is thrown straight up.it passes a 2.0m high window 7.50 m off the ground on it path up and takes 1.30 s to go past the window.what was the ball initial velocity
2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
you have been hired as an espert witness in a court case involving an automobile accident. the accident involved car A of mass 1500kg which crashed into stationary car B of mass 1100kg. the driver of car A applied his brakes 15 m before he skidded and crashed into car B. after the collision, car A s
can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
Joseph
"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
