3d1x2 Skt Book 1

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Quizzes Created: 1 | Total Attempts: 184

Questions: 109 | Attempts: 184 | Updated: Mar 20, 2023

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Mar 20, 2023

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Apr 02, 2013

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3d1x2 Skt Book 1

What is the process, or result of the process, of modifying any characteristic of an information singal or carrier signal so that it varies in step with the instantaneous value of another information signal?

What is the conversion of an analog signal into another analog signal?

Which of these is not a form of analog modulation?

Which of these is not a basic type of digital conversion techniques?

Amplitude Shift Keying(ASK) is also know as ______ because the amplitude of the carrier was either on or off depending on the state of the digital input.

____ is the simplest form of Phase Modulation. There are two phase shifts (0 degrees or 180 degrees) for data transmission depending on whether a binary 1 or 0 is to be transmitted.

What uses four different carrier phases (0 degrees, 90 degrees, 180 degrees, and 270 degrees) to represent two data transmission bits. For example, to send 00, the phase changes by 0 degrees.

______ encodes different digital values as changes in signal phase. This is easier to implement and is more robust than PSK because____ looks for differences, rather than specific values. This form of modulation can be found in local area network technologies.

What is a combination of AM and PM? We use this to convert a digital signal to analog form by varying the amplitude and phase of the carrier signal. Using this method of modulation you are able to encode up to four data bits for transmission. This is also similar to QPSK.

What is the conversion of an analog signal into a digital signal? This is done by converting an analog wave into discrete pulses, taking multiple samples, and converting the samples into a digital signal.

What varies one or more parameters of a pulse according to a modulating signal to transmit the desired information?

____ is the simplest kind of pulse-modulation technique and is amplitude-modulated. This is used for time-division multiplexing(TDM) and differs from AM mainly in the use of a rectangular pulse train rather than a sine wave for the carrier signal.

____ is used in military TDM equipment. ____ uses a pulse time method that represents an analog signal by varying the positioning (the time displacement) of a discrete pulse within a bit interval. The position is varied according to the sampled value of an analog signal.

_____ is a complete digitization process since it converts an analog signal into one that is discrete with respect to both time and amplitude (or polarity). The signal is based on an analog signal that has already been modulated (by using PAM, PDM, or PPM).

The pulses of PCM are grouped into any of a predefined number of different levels using a ______; each of the possible levels is represented by a unique bit stream. The number of possible values in this stream determines the granularity of the modulation.

This is a variation of PCM. Amplitudes are represented using 4-bit values (rather than the 8 bits used in PCM), and a 32Kbps data-transfer rate is used (rather than 64Kbps, as in PCM).

What is a variation of DM where a signal's step size may vary from sample to sample?

This modulation varies the signal step size according to the input signal amplitude. At lower input signals, smaller step sizes minimize quantizing noise. At higher signal levels, larger step sizes minimize slope overload.

In Amplitude Modulation, we can show the output of the modulation that contain the following frequencies. Which of these is not an output?

In complex Amplitude Modulation, this sideband has the same shape and orientation as the band of modulating signal frequencies.

In complex Analog Modulation, this sideband is the mirror image of the original modulating signal. This sideband is said to be inverted, since its shape is the reverse of the modulating signal.

We can express the 6-to-1 improvement of SSBSC over DSBSC as __ decibels (dB) of improvement.

______ signals can be detected by reinserting the carrier frequency, when heterodyned with the received signal, produces a sum and a difference output signal. The sum signal is eliminated, and the difference signal corresponds to the original modulating signal.

The predominant characterisic of single-sideband modulation is that ___________.

The only basic waveform in nature is a pure _____ wave; any other waveform is a "composite" or "resultant" wave.

What term do we use for the additional sidebands that cause unwanted bandwidth and distortion in the transmitted AM signal?

In ____, the amplitude of the modulated wave does not change---only the frequency is varied.

In _____, the information is represented by instantaneous variations in the phase of the carrier wave.

In FM, the _______ used to establish the carrier frequency is made to change above and below the carrier frequency with each cycle of the intelligence waveform to produce the modulated wave.

____________ in FM is proportional to the cycle rate (frequency) of the modulating signal.

In FM, who establishes the amount of deviation?

The frequency during the constant amplitude portion of each alternation is the ______ frequency.

The amount of phase shift is proportional to the ________ of the modulating signal.

The rate of phase shift is porportional to the _________ of the modulating signal.

The output of a PM modulated signal also varies in amplitude. Therefore, the signal is fed to a ______ to remove amplitude variations and maintain the phase shift only.

The big advantage of PM over FM is that this circuit uses a _______-controlled oscillator to maintain a stable carrier frequency.

In FM, the oscillator cannot be crystal controlled, since it is actually made to vary in frequency. That means that an FM oscillator requires a complex _______ circuit to achieve the same degree of stability.

The important thing to remember about the difference between FM and indirect FM is that modulation occurs at the oscillator stage in FM, while it occurs in a stage _____ the oscillator in indirect FM.

What is one distinct advantage of BPSK?

In QPSK, if a "10" is transmitted, how many degrees will the phase shift?

In DPSK, information is not represented by an absolute phase value but by a _______ in phase value.

The information-carrying components that occur on either side of a carrier are called _______.

In PAM, we call the frequency components that are multiples of f(o) ________. The number of the ________ is the number of its multiple of f(o).

__ encodes different digital values as changes in signal phase. This is easier to implement and is more robust than PSK because looks for differences, rather than specific values. This form of modulation can be found in local area network technologies.

is used in military TDM equipment. uses a pulse time method that represents an analog signal by varying the positioning (the time displacement) of a discrete pulse within a bit interval. The position is varied according to the sampled value of an analog signal.

In PAM, we call the frequency components that are multiples of f(o) . The number of the is the number of its multiple of f(o).