A. Suppose that a modulated signal x(t) is created by taking a baseband signal and mixing it with a 250 Hz cosine signal, resulting in the passband spectrum X(f) shown below. Suppose that the modulated signal x(t) is mixed with a 200 Hz cosine signal c(t). The spectrum of the 200 Hz cosine is shown below as C(f). (Please look at the picture.)Which of the spectra above is the spectrum of the after mixing x(t) and c(t)?(Please pick among the choices in the picture)=============================================B. Please look at the 2nd picture. Need help. Thank you. 1年X(f)-500-400-300-200-10010020030040050014 C(f)-500-400-300 -200 -100100200300400500Consider the four amplitude spectra shown below.A400 300 -200100200' 300' 400f500-500-100ATAApt-500400-300-200-100100200300400500CA,Apt-500-400-300-200-100100200300400500D300f500-500-400300-200-100100200400 Consider a received signal containing two baseband signals modulating two differentcarriers so that they occupy non-overlapping regions of the spectrum. One of thebaseband signals has a rectangular spectrum, and the other has a triangular spectrum.The spectrum of the received signal, Y(f), is shown below.Y(f)++ ++++-200++++++++> f{kHz)150200-250-150-1005050100250The desired signal is demodulated by first mixing the received signal with a cosine withfrequency 110kHz.Which of the following is the bandwidth of an ideal low pass filter that will isolate thedesired baseband signal only?Select one:a. 85 kHzb. 25 kHzC. 15 kHzd. 55 kHz

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Answered: A. Suppose that a modulated signal x(t)…

Introductory Circuit Analysis (13th Edition)

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ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

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A. Suppose that a modulated signal x(t) is created by taking a baseband signal and mixing it with a 250 Hz cosine signal, resulting in the passband spectrum X(f) shown below. Suppose that the modulated signal x(t) is mixed with a 200 Hz cosine signal c(t). The spectrum of the 200 Hz cosine is shown below as C(f).

(Please look at the picture.)

Which of the spectra above is the spectrum of the after mixing x(t) and c(t)?

(Please pick among the choices in the picture)

=============================================

B. Please look at the 2nd picture. Need help. Thank you.

1年X(f)
-500
-400
-300
-200
-100
100
200
300
400
500
14 C(f)
-500
-400
-300 -200 -100
100
200
300
400
500
Consider the four amplitude spectra shown below.
A
400 300 -200
100
200' 300' 400
f
500
-500
-100
ATA
Apt
-500
400
-300
-200
-100
100
200
300
400
500
C
A,
Apt
-500
-400
-300
-200
-100
100
200
300
400
500
D
300
f
500
-500
-400
300
-200
-100
100
200
400

Consider a received signal containing two baseband signals modulating two different
carriers so that they occupy non-overlapping regions of the spectrum. One of the
baseband signals has a rectangular spectrum, and the other has a triangular spectrum.
The spectrum of the received signal, Y(f), is shown below.
Y(f)
++ ++++
-200
++++++++> f{kHz)
150
200
-250
-150
-100
50
50
100
250
The desired signal is demodulated by first mixing the received signal with a cosine with
frequency 110kHz.
Which of the following is the bandwidth of an ideal low pass filter that will isolate the
desired baseband signal only?
Select one:
a. 85 kHz
b. 25 kHz
C. 15 kHz
d. 55 kHz

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