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Beginner Topic 6 of 49 Graphics, Vision & Media

Audio Basics

Sampling and quantizing sound.

How it works

Sound is a pressure wave, captured by a microphone as a continuous voltage and digitized by sampling at regular intervals and quantizing each sample. The sample rate determines the highest representable frequency, by the Nyquist theorem at half the rate, so 44.1 kHz covers up to 22 kHz, beyond human hearing, and bit depth sets dynamic range, 16 bits giving 96 dB. Channels provide mono, stereo or surround, and formats include uncompressed WAV, lossless FLAC and lossy MP3 and AAC.

Where it is used

Music and podcast production, voice calls, game audio, speech recognition and sound analysis start from digital audio concepts. Time-frequency analysis uses the Fourier transform and spectrograms.

Common pitfall

Sampling below twice the highest frequency causes aliasing, so anti-aliasing filters are needed. Clipping occurs when levels exceed the range, producing harsh distortion. Resampling and format conversions can degrade quality, and perceptual codecs discard information irreversibly. Record with headroom, keep masters in lossless formats and match sample rates across a project.

Where it fits in the course

Audio Basics is topic 6 of 49 in Graphics, Vision & Media, rated Beginner. It follows Image Compression. The next topic is Video Basics.

Practice and explore

How to study this topic

  1. Read the explanation above and restate the definition in your own words.
  2. Open the interactive lesson and answer its mini quiz.
  3. Read the common pitfall, then write a short example that avoids it.
  4. Check your understanding in the Graphics, Vision & Media quiz, and revisit the topic if you miss a question.

Frequently asked questions

What is Audio Basics?
Sampling and quantizing sound. It belongs to Graphics, Vision & Media and is a beginner-level topic.
Where do people use Audio Basics?
Music and podcast production, voice calls, game audio, speech recognition and sound analysis start from digital audio concepts.
What is the most common mistake with Audio Basics?
Sampling below twice the highest frequency causes aliasing, so anti-aliasing filters are needed.
What should I learn before this topic?
Start with Image Compression, the topic just before it in Graphics, Vision & Media.
How can I practice it?
Answer the mini quiz in the interactive lesson, then take the Graphics, Vision & Media quiz.
Is Audio Basics hard to learn?
It is a Beginner topic, so it works as an entry point. If the terms are new, read the explanation twice and try the visualizer before the quiz.
How long does it take to learn Audio Basics?
Most learners can read the explanation and finish the interactive lesson in under an hour. Fluency comes from applying the idea, so plan a few short practice sessions with the quiz.
Which topics are related to Audio Basics?
Image Compression, Video Basics, Image Formats are closely connected. The full list is in the related topics section of this page.
What should I study after Audio Basics?
Continue with Video Basics, the next topic in Graphics, Vision & Media.

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