Test SXI audio-video 2ª Evaluación (Ingles)

Concepts: Digital audio. Frequency (Hz). Sample rate (Hz). Bit resolution. Bitrate. Codec. Decibel.

Concepts: Digital Video. Dimensions or resolution. Bitrate. Frames per second (fps). Aspect ratio.

If file is digitalized, it’s necessary a digitalization process and compression for generating a file able to be played in a computer. true. false.

Usually, audio and video are not compressed separately and the compression methods are different. true. false.

Compression techniques consists in reduce and eliminate redundant data. true. false.

Excessive compression may lead to lose video quality. true. false.

With efficient compression techniques the file size can be dramatically reduced without affect (almost) the quality of our video/audio. true. false.

The frequency is: Number of times that the air vibrates in a second. Analogic sound. Number of times that the air vibrates in a second. Digital Sound.

Sample rate, defines how many time we´ll get the analogic signal for generating digital signal: true. false.

Number of bits used for storing our analogic signal. bit resolution. bitrate.

Defines how many space in HD take a second of the audio. bit resolution. bitrate.

Codec is an acronym for encoding and not decoding. It is a special algorithm. true. false.

the unit of measure of the volume of intensity of a sound. Decibel. BitSound.

Size of the video expressed in pixel when visualized at 100%. FPS. Resolution.

FPS: Inidcates how many frames appears in a second. true. false.

Aspect ratio: Proportion between height and weight. True. The answer is false, it is not weight but width.

Codification and compression. Usually, audio and video are compressed separately and the compression methonds are different. Typically, audio and video are compressed together and the compression methods are the same.

Compression techniques consists in reduce and eliminate redundant data. Codification and Compression. Codification and Compilation. Compression and Compilation.

Excessive compression may lead to lose video quality¡¡. true. false.

Excessive compression can cause quality improvement. true. false.