Exam 8: Representing Multimedia Digitally

To play a digitized sound, the numbers are read from memory into a digital-to-analog converter (DAC) which creates an electrical wave that is input to a speaker .

The process of reducing the number of bits required to present information from which the original form cannot be exactly reconstructed is known as ________ compression .

Each pixel on a computer display is formed from red, yellow, and blue colored lights .

Assume you have a scanned black and white photo and the subpixels had values of 195 each . You want the image's pixels to all be nearer intense white while keeping their relative relationships . Which of the following could the subpixels be changed to?

When sound is created in a digital environment, a continuously changing wave (in analog form) is created .

The decimal number 174 is equivalent to binary

Digitizing a sound wave requires that the analog wave be converted to bits .

The Nyquist rule requires that, to capture frequencies up to 17,000 Hz, you must sample at a rate of at least ________ Hz .

Which of the following statements is NOT correct?

All colors with equal intensities of the RGB subpixels are always some shade of gray .

Higher bandwidth usually means higher latency .

Digitizing sound

The compression scheme of the Motion Picture Experts Group of the ISO is ________ .

Run-length encoding is a lossy compression scheme .

GIF encoding

When an object vibrates, the vibrations push the air which causes pressure waves that vibrate our eardrums and, by doing this, create sound .

Small points of colored light arranged in a grid to form a computer display are called ________ .

An object creates sound by vibrating in a medium .

The MP3 compression ratio is typically more than 10:1 which means that the number of bits is much greater after compression .

Select all that apply . Digitized sound