Digital TV Signal Transmission and Reception: Key Concepts
Digital TV Signal Transmission and Reception
In the spectrum shown in the figure, the digital signals are:
c) Luminance, chrominance, sound stereo sound 2, 3, and 4.
To narrow the spectrum occupied by an analog TV channel, the following is used to deliver the luminance modulation:
c) AM with Vestigial Sideband (VSB).
Report of the scheme at which point the spectrum is shown below:
d) 4
To output a television signal from a mountain with a coverage angle of 160 degrees, if the panels only cover 90 degrees, the solution would be:
c) Place two panels at an angle of 90° between them.
In a microwave radio link system, the following is due to meet. Identify the incorrect answer:
d) That signals the first and second Fresnel zones reach integrate.
Point out the incorrect statement regarding QAM modulation:
c) The digital data frequency modulates the main carrier.
Indicate the erroneous statement on PSK modulation:
b) Since the phase detection is simple and serves to transmit long strings of bits.
About the COFDM transmission system, the following statement is incorrect:
d) It is used in satellite digital TV DVB-S digital transmission.
Indicate the parameter that is NOT a measure of quality value in digital television:
a) Cyclic Redundancy Check (CRC)
Indicate the claim on the BER (bit error rate) that is INCORRECT:
b) The higher the BER, the more assurance we will correct image.
In radiant systems of TV broadcasting, the desired coverage angle is achieved by:
d) Placing multiple radiating elements with different emission directions.
In PSK modulation for television:
c) Move the carrier phase according to the digital mix set.
In an analog television relay transmitter system, which is correct:
c) The system has two premises controlled by PLL oscillators (for Rx and Tx).
Indicate the statement that is INCORRECT regarding the DVB system:
a) Compress the analog channels and FM radio in a single channel.
To output a television signal from a mountain with a coverage angle of 160 degrees, if we only cover panels 90 degrees, the solution would be:
c) Place two panels at an angle of 90° between them.
The propagation of electromagnetic waves in space can occur in different ways. Indicate the INCORRECT statement:
a) The surface wave propagation occurs in very high frequencies.
Antennas are often used to work in a way that:
b) The capacitive and inductive reactance and resistance setting aside a minimum.
In the case of antennas used to broadcast, which is due to meet:
(Report the claim WRONG)
a) The ROE must be as low as possible, on the order of 0.1 or 0.2.
The antennas used in Seville to receive terrestrial TV are:
c) Yagi antennas with horizontal polarization.
The most common dishes are:
(Pointing to the wrong answer)
d) Phased dipole flat panels.
Point out the statement that is incorrect with regard to the characteristics of the antennas, both for broadcast and for receipt.
d) The antennas used to receive a good ROE prevents breakage.
Satellite dishes that are oriented to receive a geostationary satellite must be ‘point’ according to the following considerations (note the phrase INCORRECT)
c) From Spain, all visible satellites are in a straight line to the south.
If we put two identical emitter panels (gain 10 dB / 80° emission angle) in the same direction and phased over each other and the appropriate distances:
c) The gain of the whole would be approximately 13 dB.
Electromagnetic waves travel through space in one direction and with:
b) The magnetic and electric field in perpendicular planes.
Electromagnetic waves have some parameters that define them, some of them are:
b) Polarization, power, frequency, and wavelength.