30 Questions
What is sound made up of?
Pressure differences and air molecules
What type of waveform does not exhibit regularity?
Noise
What is the unit of regularity of a waveform?
Cycle
What determines the pitch of the sound as heard by our ears?
Frequency
What are the two characteristics of sound waves?
Frequency and Amplitude
What is the unit of measurement for the rate at which sound is measured?
Hz
What is the frequency range of human hearing?
20 Hz - 200 kHz
What does the amplitude of a sound wave represent?
The intensity or loudness of the sound
What is the purpose of an Analogue to Digital Converter (ADC)?
To convert analogue signals into digital signals
What is the process called when converting analogue sound into digital sound?
Digitization
What are the two parts of the digitization process?
Sampling and Quantization
What is the purpose of a Digital to Analogue Converter (DAC)?
To convert digital signals into analogue signals
What is the main purpose of MIDI (Musical Instrument Digital Interface)?
To specify a musical performance by sending instructions to musical instruments
What is a MIDI sequencer?
A tool that allows musicians to edit and create musical compositions
What is an advantage of MIDI compared to WAV files?
Smaller file size and storage requirements
What is an example of using audio effectively in multimedia?
Sounding an alarm when a limit is reached
What is a use of audio in multimedia?
To provide musical background for a video segment
What is a characteristic of MIDI files?
They have small file sizes
What is the primary function of quantization in digital audio?
To select the closest level to present a signal sample
What is the typical sampling rate for CD audio?
44.1 KHz
What is the purpose of resolution in digital audio?
To store the amplitude value of a digital audio signal
What is the formula to calculate the size of a digital audio file?
rate × duration × resolution × number of channels
What is the purpose of digital audio editing software?
To perform various operations such as trimming, splicing, and volume adjustments
What is the factor that determines the quality of digital audio signals?
Sampling rate and resolution
How can audio be used in a medical context?
To train medical students to recognize different breathing sounds
What is an advantage of using audio in multimedia applications?
It can communicate more directly than other media
What is a disadvantage of using audio?
It is easily overused
What is a type of digital audio that requires a lot of storage space?
Sampled audio
What is MIDI data used for?
To provide instructions on musical compositions
What is an example of how audio can be used for direct voice communication?
Leaving a voice message for other users of an application
Explore the basics of digital audio, including waveforms and attributes of sound, capturing digital audio, audio file formats, and audio compression.
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