block diagram of digital modulation in order

input data - precorder - modulator - bpf and power amplifier - medium - bpf and amplifier - demodulator and decoder - output data

input data - clock - buffer - analog carrier - bpf - carrier and clock recovery - output data

input data - decoder - demodulator - bpf - medium - bpf - modulator - precorder - output data

They recover the analog carrier and digital timing signals from the incoming modulated waves since they are necessary to perform the demodulation process

Clock and Carrier Recovery Circuits

Who developed a useful relationship among bandwidth, transmission time, and information capacity?

R. Hartley of Bell Telephone Laboratories

R. Shannon of Bell Telephone Laboratories

Binary systems such as binary FSK an binary PSK, baud and bit rate are _

baud rate is greater than bit rate

bit rate is greater than baud rate

This statement holds true to all forms of digital modulation except FSK

Baud and Minimum Nyquist Bandwidth have the same formula of bit rate divided by number of bits encoded

Baud and Minimum Nyquist Bandwidth have different formula of bit rate divided by number of bits encoded

Baud and Minimum Nyquist Bandwidth have the same formula of baud rate divided by number of bits encoded

ASK is similar to the standard amplitude modulation except:

There are only two output amplitudes possible

There are only four output amplitudes possible

There is only one output amplitudes possible

The correct general expression of ASK is:

v(t) = (1 + V m (t)[ $$\frac{A}{2}$$ cos(w c t)]

v(t) = V c cos{2 $$\pi$$ [f c + V m (t) $$\Delta$$ f]t}

In ASK, bit rate is equal to nyquist bandwidth and baud rate

false, bandwidth is only equal to bit rate but not in baud rate

The bit time is the reciprocal of the baud rate and the time of one signaling element is the reciprocal of the baud.

false, The bit time is the reciprocal of the bit rate and the time of one signaling element is the reciprocal of the baud.

in ask, does the number of bits encoded into one signaling element is always equal to one?

no, it can be 0 or 1. But usually, N = 1 since Bandwidth and Baud Rate are equal to bit rate

Baud rate is equal to bit rate over number of bits encoded while bit rate is equal to baud rate multiply number of bits encoded in HIGHER-THAN-BINARY-ENCODING

true, this is the standard formula yet in ASK they are all equal since the rate of change of ask waveform is the same to the rate of change of binary input

These are the applications of digital modulation except:

broadband digital subscriber lines

satellite communications systems

MODULE 1-2

Authored by Naiomy Eunice Cristobal

Engineering

University

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

the transmission, reception, and processing of information with the use of electronic circuits

signal

electronic communication

digital modulation

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A knowledge that is communicated between two or more points

Modulation

Digital Transmission

Information

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Also called digital radio

Digital Analog Signal

Digital Transmission

Digital Modulation

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In digital _, the carrier facility of can be a physical cable or free space

Modulation/Radio Systems

Transmission

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the difference between digital radio systems and conventional analog modulation system?

Digital radio systems' information signal is digital while Analog Modulation Systems' information signal is analog

Digital radio systems' information signal is analog while Analog Modulation Systems' information signal is digital

Digital radio systems' information signal is modulating signal while Analog Modulation Systems' information signal is analog signal

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The amplitude and phase are varied proportional to the information signal

ASK

Quadrature Amplitude Modulation

FSK

FILL IN THE BLANK QUESTION

1 min • 1 pt

Forms of Digital Modulation

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MODULE 1-2

the transmission, reception, and processing of information with the use of electronic circuits

A knowledge that is communicated between two or more points

Also called digital radio

In digital _, the carrier facility of can be a physical cable or free space

What is the difference between digital radio systems and conventional analog modulation system?

The amplitude and phase are varied proportional to the information signal

Forms of Digital Modulation

v(t) = Vsin(2 π *ft + θ ), theta is?

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