Representing Sounds Flashcards
What is an analogue signal?
Information in the form of continuous varying data is an analogue signal
What is sampling?
Sampling is the process that converts analogue sound into discrete digital data that can be stored in a computer.
What factors affect the audio quality of digital sound?
Sampling rate, bit depth
and bit rate
What is a sampling rate?
The sampling rate is the number of samples taken per second.
What is the unit for measuring a sampling rate?
Hertz (Hz)
True or false: The higher the sampling rate, the higher the sound detail.
True
What is bit depth?
Bit depth is the number of bits available for each sample.
What values does a CD represent?
CD can represent values from 0 to 65535(216 -1).
What is a bit rate?
Bit rate is the number of bits of data used to store data sampled every second.
What unit is used to calculate the bit rate?
The unit for bit rate is kilobits per second (kbps).
How is the bit rate calculated?
Bit rate=Sampling rate × bit depth × channels
True or False: The more the bit rate the lesser the quality.
False. The more the bit rate the better the quality.
Why is the audio quality of a music CD better than downloading from Internet?
The bit rate of a music CD is higher than downloading from Internet
True or False: The more the bit rate the higher the file size.
True.
How is a file size of an audio file calculated?
File size (bits) =bit rate× number of seconds
What is the bit depth of a CD?
16 bits
