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REDacted Studying > Audio Formats > Flashcards

Audio Formats Flashcards

1
Q

What is an audio format?

A

A type of computer file that stores music

Audio formats can be categorized into uncompressed lossless, compressed lossless, or lossy.

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2
Q

Define bitrate.

A

The number of bits conveyed or transferred in a unit of time

In music formats, bitrate is measured in kilobits per second (kbps).

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3
Q

What does a higher bitrate indicate?

A

Higher quality of the audio file

For example, an MP3 320kbps file transfers 320 kilobits per second.

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4
Q

What are uncompressed lossless formats?

A

Formats that store all of the original recorded data

Examples include WAV (PCM) and AIFF (PCM).

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5
Q

What is the main uncompressed lossless format?

A

Pulse-code modulation (PCM)

PCM is used in formats like WAV and AIFF.

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6
Q

What defines compressed lossless formats?

A

They store all original recorded data in less space than uncompressed lossless formats

They achieve this by compressing the data.

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7
Q

List examples of compressed lossless formats.

A
  • Free Lossless Audio Codec (FLAC)
  • Apple Lossless Audio Codec (ALAC)
  • Monkey’s Audio (APE)

These formats retain all data and can be transcoded without quality loss.

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8
Q

What are lossy formats?

A

Compressed formats that remove some original data

They have smaller file sizes but may have audible differences compared to lossless formats.

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9
Q

True or False: Lossy formats can be transcoded into lossless formats without losing quality.

A

False

Lossy formats cannot be transcoded into lossless because they have already lost data.

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10
Q

List examples of lossy formats.

A
  • MPEG Layer 3 Audio (MP3)
  • Advanced Audio Encoding (AAC)
  • Windows Media Audio (WMA)
  • Dolby Digital Audio Codec 3 (AC3)
  • DTS Coherent Acoustics Codec (DTS)

These formats are always compressed.

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11
Q

What is the file size of an uncompressed lossless WAV (PCM) file for a 3-minute, 24-second song?

A

34.3 MB

This is the size for the song ‘Sk8er Boi’ by Avril Lavigne.

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12
Q

What is transparency in audio formats?

A

The audible quality of a lossy music file where it cannot be distinguished from a lossless file by the average human

MP3 192kbps is often considered transparent.

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13
Q

What is the only allowed lossless format on RED?

A

FLAC

Lossless formats can be transcoded without a loss in quality.

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14
Q

List the allowed lossy formats on RED.

A
  • MP3 (minimum bitrate 192kbps)
  • AAC
  • AC3
  • DTS

MP3 is the most popular lossy format on RED.

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15
Q

Fill in the blank: The minimum bitrate for MP3 on RED is _______.

A

192kbps

This applies to both CBR and VBR settings.

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REDacted Studying (6 decks)

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