Storing Sound Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

How is sound recorded

A

By a microphone as analogue signal

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2
Q

What is an analogue signal

A

Pieces of continuously changing data

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3
Q

How can computers read and store sound files

A

Analogue signals are converted into digital data

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4
Q

How are Analogue signals converted into digital data

A

By Analogue to digital converters

Found in most modern devices

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5
Q

What is the process of converting analogue signal to digital data called

A

sampling

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6
Q

How are analogue recordings converted into digital data

A
The amplitude (height of the sound wave) is sampled at regular intervals.
The amplitude can only take certain values depending on the bit depth
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7
Q

What happens once device sampled recording

A

It creates curve digitally, where each block of data matches where each sample was taken

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8
Q

What is a downside of digital data

A

Despite having the same shape as analogue wave it is not continuous. A lot of data is lost. Peaks in analogue waves is much flatter in digital data

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9
Q

How can digital data be improved

A

By taking samples more regularly- most music isn’t sampled every second but every millisecond

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10
Q

What is the sample rate/sample frequency

A

How many samples you take in a second

measured in hertz(hz) or kilohertz(kHz)

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11
Q

Bit depth

A

number of bits available for each sample

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12
Q

How is size of sound file calculated

A

File size (in bits)= sample rate (in hz) x bit depth x length (in seconds)

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13
Q

What does increasing sample rate mean

A

Analogue recording sampled more often. Sampled sound would be better in quality % more closely match original recording

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14
Q

What does increasing bit depth mean

A

Digital file picks up quieter sounds even if happening at same time as louder ones. Will result in sampled sound closer to quality of original recording

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15
Q

What is the con of increasing bit depth or sample rate

A

Increased file size

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