Digital Audio Fundamentals

What is sound made up of?

Air molecules only
Pressure differences only
Pressure differences and air molecules (correct)
Vibrating objects and sound waves

What type of waveform does not exhibit regularity?

Periodic waveform
Cycle
Noise (correct)
Hertz

What is the unit of regularity of a waveform?

Hz
Second
kHz
Cycle (correct)

What determines the pitch of the sound as heard by our ears?

Frequency (D) Signup and view all the answers

What are the two characteristics of sound waves?

Frequency and Amplitude (D) Signup and view all the answers

What is the unit of measurement for the rate at which sound is measured?

Hz (D) Signup and view all the answers

What is the frequency range of human hearing?

20 Hz - 200 kHz (B) Signup and view all the answers

What does the amplitude of a sound wave represent?

The intensity or loudness of the sound (C) Signup and view all the answers

What is the purpose of an Analogue to Digital Converter (ADC)?

To convert analogue signals into digital signals (B) Signup and view all the answers

What is the process called when converting analogue sound into digital sound?

Digitization (C) Signup and view all the answers

What are the two parts of the digitization process?

Sampling and Quantization (C) Signup and view all the answers

What is the purpose of a Digital to Analogue Converter (DAC)?

To convert digital signals into analogue signals (C) Signup and view all the answers

What is the main purpose of MIDI (Musical Instrument Digital Interface)?

To specify a musical performance by sending instructions to musical instruments (A) Signup and view all the answers

What is a MIDI sequencer?

A tool that allows musicians to edit and create musical compositions (B) Signup and view all the answers

What is an advantage of MIDI compared to WAV files?

Smaller file size and storage requirements (A) Signup and view all the answers

What is an example of using audio effectively in multimedia?

Sounding an alarm when a limit is reached (A) Signup and view all the answers

What is a use of audio in multimedia?

To provide musical background for a video segment (D) Signup and view all the answers

What is a characteristic of MIDI files?

They have small file sizes (C) Signup and view all the answers

What is the primary function of quantization in digital audio?

To select the closest level to present a signal sample (C) Signup and view all the answers

What is the typical sampling rate for CD audio?

44.1 KHz (C) Signup and view all the answers

What is the purpose of resolution in digital audio?

To store the amplitude value of a digital audio signal (A) Signup and view all the answers

What is the formula to calculate the size of a digital audio file?

rate × duration × resolution × number of channels (B) Signup and view all the answers

What is the purpose of digital audio editing software?

To perform various operations such as trimming, splicing, and volume adjustments (A) Signup and view all the answers

What is the factor that determines the quality of digital audio signals?

Sampling rate and resolution (D) Signup and view all the answers

How can audio be used in a medical context?

To train medical students to recognize different breathing sounds (B) Signup and view all the answers

What is an advantage of using audio in multimedia applications?

It can communicate more directly than other media (B) Signup and view all the answers

What is a disadvantage of using audio?

It is easily overused (A) Signup and view all the answers

What is a type of digital audio that requires a lot of storage space?

Sampled audio (D) Signup and view all the answers

What is MIDI data used for?

To provide instructions on musical compositions (B) Signup and view all the answers

What is an example of how audio can be used for direct voice communication?

Leaving a voice message for other users of an application (B) Signup and view all the answers