3 Questions
The transformation of the means for electrical signal processing and the availability of digital components capable of operating / managing data compatible with the video and television system allowed the “digitization” of the analog signal. Starting from the analog standard PAL 625/50, from the frequency used for the QAM modulation of the color component of approx. 4.433MHz and from the fact that to reproduce the phase and amplitude information of a sine it is necessary at least 4 samples resulted:
a) A number of approximately 1135 samples per line according to the formula 4 * (2 * (1/50) / 625) / (1 / 4.433
Image and video sensors are used in specific equipment dedicated to the acquisition of photo-video information consisting of optical elements (lenses) and electronic components for power, command and control. Thus, the amount of light that reaches the image is controlled by:
d) changing the diameter through which light enters / to the sensor
The transformation of the means for electrical signal processing and the availability of digital components capable of operating / managing data compatible with the video and television system allowed the “digitization” of theanalog signal. For an HDTV frame, the total effective frame size (digital active line + digital blanking) must also contain the 45 inactive lines and 280 inactive horizontal samples.
a) the total effective size of the frame is 1920 x 1080
Study Notes
Digitization of Analog Signal
- The transformation of electrical signal processing and availability of digital components enabled the digitization of the analog signal.
- The digitization process started from the analog standard PAL 625/50.
QAM Modulation
- The frequency used for QAM modulation of the color component is approximately 4.433MHz.
- At least 4 samples are required to reproduce the phase and amplitude information of a sine.
Image and Video Sensors
- Image and video sensors are used in specific equipment for acquiring photo-video information.
- The equipment consists of optical elements (lenses) and electronic components for power, command, and control.
- The amount of light that reaches the image is controlled by the equipment.
HDTV Frame
- For an HDTV frame, the total effective frame size must include the digital active line and digital blanking.
- The frame size also contains 45 inactive lines and 280 inactive horizontal samples.
This quiz explores the digitization process of analog signals in video and television systems, including the transformation of means for electrical signal processing and the availability of digital components. It also delves into the technical aspects such as QAM modulation, color components, and sampling requirements for reproducing phase and amplitude information.
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