Sound Flashcards

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1
Q

Why can’t Analogue data be stored in its original form?

A

Analogue data is continuous so it can’t be stored

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2
Q

Why can Digital data be stored?

A

Digital data is discrete so can be stored as an electrical voltage which can be represented as a bit pattern

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3
Q

How do you convert from Analogue to Digital sound

A
  • A microphone records the analogue signals
  • It converts this into an electrical voltage
  • This is converted into binary values by the ADC which samples the data at a given frequency, to be stored in the computer
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4
Q

What are the steps of converting from Digital to Analogue?

A

DAC’s convert digital data into a continuously varying analogue signal

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5
Q

How do you convert from Digital to Analogue sound

A

-This binary data is turned back into electrical voltage by the DAC, then a speaker moves according to the electrical voltage producing analogue sound

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6
Q

What is the aim of taking samples at regular intervals?

A

To create an approximation of the original sound wave

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7
Q

What is Sample rate?

A

Sample rate is the amount of samples taken per second

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8
Q

State Nyquist’s Theorem.

A

The sound must be sampled at a rate that’s twice the highest analogue frequency to recreate an accurate representation of the original soundwave.

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9
Q

What is sample resolution?

A

The number of bits used to store each sample

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10
Q

How does sample rate and resolution affect the stored data form of the audio?

A

The higher the sample rate and resolution, the better the sound quality and the larger the file size

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11
Q

State the two formulas for representing file size in mono or stereo

A

Mono : Frequency x Sample resolution x length

Stereo : Frequency x Sample resolution x length x 2

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12
Q

What is MIDI and what does it stand for

A

Musical instrument digital interface is used to synthesis musical instruments. It’s used for editing, recording and playing back music.

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13
Q

What are the advantages of using MIDI

A
  • Music can easily be manipulated or transposed
  • Provides access to individual musicians, doesn’t require a whole orchestra
  • Is straightforward to create a musical score
  • Better sound quality (no background noise)
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14
Q

How does amplitude and frequency affect the sound and what is frequency stored in?

A

Amplitude affects the volume, frequency affects the pitch. Frequency is stored in hertz

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