What is lossless sound quality Part 2
The principle of these audio compression methods is to preserve places that are easily heard by the human ear as much as possible.
In conventional fixed bit rate (CBR) mode, the audible data in the audio is removed and is easier for the human ear to hear. The more information that is withheld, the less information that is withheld when the part is inaudible. As the complexity of the sound increases, the degree of deterioration in sound quality becomes more apparent. For example, when listening to pure voice Performances and performances combined with background music, pure compressed music for vocals, sounds less degraded than the original file.
As for the lossless sound quality offered by the current streaming platform, there are many formats, but in fact, strictly speaking, these formats, including flac and ALAC, belong to lossless compression (non-destructive data compression) in place of lossless sound quality in a strict sense. The performance is almost the same as WAVE, but the file size is small, the decoding speed is fast, and at the same time, it can be used in streaming services. Therefore, it is also the representative format of lossless sound quality entering the era of non-optical disc media, and it is also the current music streaming service.
In addition, Tidal’s MQA is a more controversial format, because although MQA is general lossless audio reduction, it focuses on making high quality music files higher than CD quality so that they are similar to files. CD-quality flac. original high-quality sound format, but the point of controversy is whether the higher compression ratio can maintain the same real listening experience as the original high-quality sound quality has been controversial, and MQA requires a specific device to perform the hardware decoding. many devices are still only able to do MQA decoding through software.
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▲Today’s so-called High-Resolution Audio generally refers to sound quality above CD, but to be certified, the device must support 24-bit, 96kHz format processing capability.
However, since MP3 and AAC are previously planned destructive music compression formats, their purpose is to compress CD-level sound quality into smaller files, so most of the encoding specifications are presented in one presentation. 16-bit 44.1 kHz or 16-bit 48 kHz CD-level audio, but MQA is a format with a reduced file size that blocks high-quality sound. Basically, the MQA format will be equivalent to PCM 24-bit or top music.
In fact, with that said, current music file formats that don’t emphasize high-quality streaming services, whether presented in MP3 or AAC, are called lossy-compressed music, while high-quality, lossless streaming quality is compressed without loss. music. As for the music heard by traditional vehicles like vinyl and CD, it is called lossless music. In theory, non-destructively compressed lossless music and lossless music should have the same sound quality.
Does lossless sound quality have to be good? Does compressed sound have to be bad?
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▲ Although Apple Music has released lossless sound quality, its marketing focus is on spatial audio
When the Japanese audio industry started promoting high-quality music, many people jumped up and said that high-quality sound was useless. When Apple Music launched the premium sound format, its executives also said that he was one of the people who couldn’t tell the difference, noting that Apple launched the premium sound service to serve one of those hundred people. ; Before we talk about high-quality sound, let’s go back and talk about the current state of digital music on today’s playback devices. .
