Sound

An audio file has 44,100 samples per second, bit depth of 24-bits and a channel. Estimate the file size for one second?

• 129.2 bits

• 129.2 bytes

• 129.2 KiB

• 129.2 MiB

Answer explanation

Estimate the file size of a 5-second audio file with 44,100 samples per second, bit depth of 24-bits and a channel.

• 646 bits

• 646 bytes

• 646 KiB

• 646 MiB

Answer explanation

Why are sound signals sampled?

• To play sound via speakers or headphones.

• To analyse sound quality

• To compress sound files

• To store in a computer

Which of the following is uncompressed file formats?

• MP3

• WAV

• Ogg Vorbis

• All of the above

What is bit depth?

• Number of bits available for each sample

• Number of bits of data used to store data sampled every second.

• Number of samples in a second.

Which of the following represents the calculation for estimating size of a sound file?

• File size (sound) = Sampling rate (Hz) x bit depth (bits) x duration (second) x channels

What is analogue sound?

• A sound signal after sampling.

• A continuously varying signal.

• A sound signal with different pitches.

• A signal that can take only certain values.

What is sampling?

• The process that converts analogue sound into discrete digital data.

• The process to take samples of a sound signal to check its quality.

• The process that converts digital data into analogue sound.

Which of the following is TRUE about sampling?

• The shape of digital sound is quite similar to analogue sound but the curves are not smooth.

• Digital sound is of higher quality when compared to analogue sound.

• A listener feels that a digital sound is very different from its analogue signal.

• All of the above

What range of values are represented by a DVD that represents each sample in 24 bits?