Q2 System shown in Fig.below is used for scrambling audio signals. The output y(r) is the scrambled version of the input m(t). (a) Find the spectrum of the scrambled signal y(r). (b) Suggest a method of descrambling y(t) to obtain m(t). A slightly modified version of this scrambler was first used commercially on the 25-mile radio- telephone circuit connecting Los Angeles and Santa Catalina island. M(f) m(t) Low-pass filter 0-15 kHz y(1) (Scrambled output) 15 kHz 15 kHz f kHz 2 cos 30,000rt

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Q2 System shown in Fig.below is used for scrambling audio signals. The output y(t) is the scrambled
version of the input m(t).
(a) Find the spectrum of the scrambled signal y(t).
(b) Suggest a method of descrambling y(t) to obtain m(t).
A slightly modified version of this scrambler was first used commercially on the 25-mile radio-
telephone circuit connecting Los Angeles and Santa Catalina island.
M(f)
Low-pass
filter
0-15 kHz
m(t)
y(t)
(Scrambled output)
- 15 kHz
15 kHz
f kHz
2 cos 30,000t
Transcribed Image Text:Q2 System shown in Fig.below is used for scrambling audio signals. The output y(t) is the scrambled version of the input m(t). (a) Find the spectrum of the scrambled signal y(t). (b) Suggest a method of descrambling y(t) to obtain m(t). A slightly modified version of this scrambler was first used commercially on the 25-mile radio- telephone circuit connecting Los Angeles and Santa Catalina island. M(f) Low-pass filter 0-15 kHz m(t) y(t) (Scrambled output) - 15 kHz 15 kHz f kHz 2 cos 30,000t
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