What is audio compression?
Audio compression is the process of reducing the file size of an audio recording while conserving its sound quality as far as possible.
There are two main types of audio compression:
- Lossless Compression: This method reduces file size without comprising the audio quality or data. It uses algorithms to compress the audio data so that it can be perfectly reconstructed during playback. Formats like FLAC (Free Lossless Audio Codec) and ALAC (Apple Lossless Audio Codec) use lossless compression.
- Lossy Compression: This approach removes some of the audio data to reduce the file size to a large extent. It discards parts of the audio considered less perceivable by human ears, such as very high frequencies. Formats like MP3 and AAC (Advanced Audio Coding) use lossy compression. They are common in music streaming and storage due to their smaller file sizes, and most listeners don’t notice any dip in quality.
Does compression make audio louder?
Yes, compression can make audio sound louder. By reducing the peaks, it allows the overall volume to be increased without distortion, making quieter parts more audible.
When should you not to use compression?
Avoid using compression when you want to keep the natural dynamics of a recording, such as in classical music or certain acoustic performances. It’s also best to skip it if the audio already has a consistent volume level.
What is a good compression ratio for audio?
A good starting point for general audio is a ratio of 3:1 or 4:1. For more aggressive compression, like for voiceover or podcasting, you might use 6:1 or higher.
Should you always compress audio?
No, you shouldn't always compress audio. It depends on the style of the music or recording and the desired sound. Some recordings benefit from a more natural dynamic range without compression.
Do compressed audio files lose quality?
Lossy compressed audio files, like MP3s, can lose some quality because parts of the audio are removed to make the file smaller. Lossless compressed files, like FLAC, maintain the original quality.
