4. What do we need for the
transmission?
• We need two different signals L(left) &
R(right) to be modulated, transmitted, received
and demodulated duly without getting distorted
5.
6. We need :----
a.An input signal
b.Two preemphasizers
c.A DSB-SC modulator
d.A frequency doubler
e.A pilot signal
f. A summer
g.An FM modulator
7.
8.
9. Why do we need L + R & L – R??
A mono phonic receiver will work with only the
L+R component and there will no loss of
AUDIO(so the signal will have the backward
compatibility)
10.
11. We need :----
a. An input signal (through a
LIMITER DISCRIMINATOR)
b. A Low Pass Filter(0-15 KHz)
c. A Bandpass Filter(19 KHz)
d. A Bandpass Filter( 23 – 53 KHz)
e. A pilot signal
f. A Frequency Doubler
g. A Synchronous Detector
h. Two Deephasizers
12.
13.
14.
15. Preemphasizer refers to a system
process designed to increase, within a band of
frequencies, the magnitude of some (usually
higher) frequencies with respect to the
magnitude of other (usually lower) frequencies
in order to improve the overall signal-to-noise
ratio by minimizing the adverse effects of such
phenomena as attenuation distortion or
saturation of recording media in subsequent
parts of the system.
16.
17.
18.
19.
20. Deemphasizer refers to a system process
designed to decrease, within a band of
frequencies, the magnitude of some (usually
higher) frequencies with respect to the
magnitude of other (usually lower)
frequencies in order to improve the overall
signal-to-noise ratio by minimizing the
adverse effects of such phenomena as
attenuation distortion or saturation of
recording media in subsequent parts of the
system.