Can you really hear the difference in the sound quality of music?
A brief discussion of the principle of audio compression
grade headphones – performance, equipment – can you really hear the difference in music quality? A brief discussion of the principle of audio compression
When you listen to music, most of the time the format being played is MP3 or AAC.
Both formats are smaller formats in which the audio is processed and compressed. To reduce size and save space, they actually remove a portion of the sound signal compared to the original audio. But can you hear it?
In this article, we will introduce the principles of music compression and discuss a question: Does music compression really affect the music you listen to?
The principle of musical compression.
Most of the digital audio we receive every day, whether played online or stored as a file, uses the principle of lossy compression. Lossy compression not only compresses the data, but also deletes the original data, and with lossy compression, some data is gone forever.
But keep in mind that this censored data is not randomly selected. Audio compression formats apply psychoacoustics to remove sounds that are beyond our hearing range and that we are not aware of.
audio compression – operation, equipment – can you really hear the difference in music quality? A brief discussion of the principle of audio compression
The human ear has a hearing range of about 20 Hz to 20 kHz, and sound signals beyond this range cannot be detected even if they are removed. And as we age, the range of hearing decreases. Therefore, it can be said that the sounds that everyone hears are not really absolutely the same, even if they come from the same sound source.
The audio below can help you find your hearing range, you can listen to it with headphones to see how far away you can hear the sound signal. Be careful to control the volume at any time during the listening process, otherwise it may damage your hearing.
Also, when high-frequency sounds and low-frequency sounds are present at the same time, high-frequency sounds will be more difficult to hear clearly. For example, the constant drumbeats in the music can cause you to ignore the slight differences between the melodies.
This phenomenon is called “shadowing” and is used in the principle of compression. If there are louder low-frequency sounds, it can mask the sonic loss of high-frequency sounds. High and low here are relative, so this principle can be applied globally. But sounds above 15 kHz are more susceptible to masking, so that’s also a prime issue for compression.
Although it is obvious that the sound signal removed by lossy compression should be mostly useless data, there are still people who believe that these “ambient sounds” being removed will affect the three-dimensionality of the sound and flatten it.
In general, the key to lossy compression is finding a balance between reducing size and preserving sound quality.
