Question

For standard HD television there are 1920×1080 pixels in the display. There are 3 different color pixels used in the display and 8-bits are used for each pixel to indicate the brightness of its color. There are different image rates used but a 50 Hz refresh rate is often used to allow motion to appear smooth. That is, a new picture is sent to the screen 50 times per second. Each image is called a frame and this rate is thus usually referred to as the frame rate. Assume you are viewing an HD video image for 60 seconds how many bits would have to be transmitted for this one minute of video? What bandwidth would you need to transmit this video signal, that is, how many bits per second? This is a lot of bits per second, compare it to your internet connection. The only way HD TV and streaming video in general became practical was by the use of digital compression so you needed many fewer bit per image with fewer effective images and the availability of cheap semiconductor memory.

Answer 1

An HD television display consists of 1920x1080 pixels, with each pixel using 8 bits for brightness. To transmit one minute of video, a large number of bits are needed. The bandwidth required for transmitting this video signal is much higher than typical internet connections.

Step-by-step explanation:

An HD television display consists of 1920x1080 pixels, with each pixel having 3 colors and using 8 bits to indicate brightness. Therefore, for each pixel, a total of 24 bits are used to represent the color and brightness. To calculate the number of bits needed to transmit one minute of video, we first need to know the frame rate. If we assume a frame rate of 50 Hz, then there would be 50 frames per second. Multiply this by 60 seconds to get the total number of frames in one minute (3000 frames). Multiply this by the number of bits used per frame (1920x1080x24) to get the total number of bits needed for one minute of video.

To calculate the bandwidth needed to transmit this video signal, we divide the total number of bits by the duration of one minute (60 seconds). This will give us the number of bits per second.

Compared to an internet connection, the number of bits per second required for HD TV is much higher. Most internet connections have speeds measured in megabits per second, while HD TV requires transmitting multiple gigabits per second.