The so-called lossless sound quality actually means that the original music collected is not compressed, and the sound sources of all frequencies in the music are collected to maximize the details of the music and make the music more expressive and authentic. Our common lossless music formats are APE, FLAC and so on. Lossless music takes up a lot of memory because the original music is not compressed. Generally, the music at 3 or 4 o'clock is above 20 megabytes.

The standard sound quality is compression capacity, which cuts off the sound that people can't hear. We all know that the frequency that human ears can hear is between 20Hz and 20kHz. However, in the actual performance and recording process, music will inevitably go beyond this range. Although people can't hear music in this range, it doesn't rule out that some old drivers can hear music in this range.

Therefore, the standard sound quality is actually castrating music, and frequencies above 10- 12 kHz will be attenuated or cut off, which some music lovers can't bear.

Extended data

Sound fidelity

In sound technology, it includes volume, pitch and timbre. The volume of sound, that is, the intensity and amplitude of audio; The tone of sound, also called pitch, is the frequency of audio or the number of changes per second; The timbre of sound, that is, the overtone or harmonic components of audio.

Talking about the sound quality of a sound is mainly to measure whether the above three aspects of the sound reach a certain level, that is, whether it has a certain intensity relative to the pitch of a certain frequency or frequency band, whether the amplitude of each frequency point is uniform, balanced and full at the same volume within the required frequency range, whether the frequency response curve is straight and whether the pitch of the sound is accurate, which not only faithfully presents the true face of the sound source frequency or component, but also meets the requirements.

The sound is moderate and rich in overtones, which sounds beautiful. The value of sound quality is determined by the actual bit rate.

At present, the recognized sound quality standards in the industry are divided into four grades, namely, the sound quality of digital laser disc CD-DA, and its signal bandwidth is10 Hz ~ 20 Hz; FM broadcast FM quality, its signal bandwidth is 20 Hz ~15 kHz; AM broadcast quality, with signal bandwidth of 50hz ~ 7 kHz；; The sound quality of the telephone has a signal bandwidth of 200 Hz to 3400 Hz.

It can be seen that the digital CD has the highest sound quality and the telephone has the lowest sound quality. In addition to frequency range, people often use other methods and indicators to further describe the sound quality standards for different purposes.

For analog audio, the more frequency components of the reproduced sound, the less distortion and interference, the higher the fidelity of the sound and the better the sound quality. For example, in communication science, the sound quality is not only measured by the frequency range of audio signals, but also by indicators such as distortion and signal-to-noise ratio. ?

For digital audio, the more frequency components of the reproduced sound, the smaller the bit error rate and the better the sound quality. Usually measured by digital rate (or storage capacity), the higher the sampling frequency, the more quantization bits, the more channels and the greater the storage capacity. Of course, the higher the fidelity, the better the sound quality.

References:

Baidu encyclopedia sound quality