{"id":863,"date":"2020-03-23T15:58:27","date_gmt":"2020-03-23T07:58:27","guid":{"rendered":"http:\/\/www.aoyint.com\/2020\/03\/23\/72fa4447fe4020a9d56f430b3adc50d2\/"},"modified":"2021-01-23T18:05:19","modified_gmt":"2021-01-23T10:05:19","slug":"72fa4447fe4020a9d56f430b3adc50d2","status":"publish","type":"post","link":"https:\/\/www.aoyint.com\/english\/72fa4447fe4020a9d56f430b3adc50d2.html","title":{"rendered":"what is Hi-Res high-resolution audio source and purchase guide"},"content":{"rendered":"

Hi-Res past and present<\/span><\/p>\n

High-Resolution Audio means high-resolution music, referred to as Hi-Res Audio. It is a general term for music file types whose quality exceeds the previous CD level, and is also one of the important roles of modern digital streaming music.<\/span><\/p>\n

The sound source specification war since the last century<\/span><\/p>\n

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In the 1980s, under the leadership of Sony Digital Audio Stationary Head and Mitsubishi ProDigi, digital recording quickly became the mainstream in the 1980s.<\/span> In 1982, SONY and Philips jointly developed the CD carrier, making digital audio gain the favor of consumers.<\/span> Soon after recording technology entered digitalization, the recording specifications of record companies exceeded the specifications of the quality of CDs sold in the market.<\/span><\/p>\n

Limited by the storage technology at the time, if the recording is carried out according to the recording specifications, a single track may be equivalent to the storage capacity of a CD. CDs have never had the above-mentioned digital files in the market.<\/span><\/p>\n

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The first commercial music medium Super Audio CD that “exceeds CD quality” is known as SACD.<\/span> As early as 1999 AD, it was jointly published by SONY and Philips. Unlike the PCM code used in CD, SACD innovatively uses DSD code, which has a higher response frequency and dynamic range.<\/span><\/p>\n

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As for the competitor DVD Audio that will debut later, it still uses PCM encoding, but it has a sampling frequency and sampling rate several times that of the CD specification. Both the response frequency and dynamic range have been greatly improved. Therefore, in the specification war of high-resolution music,<\/span> DVD Audio has benefited from the use of CD recording technology. Many record companies and audio equipment companies do not want to restrict the patents of SONY and Philips, which makes suppliers more willing to use DVD Audio.<\/span><\/p>\n

At that time, the DVD cracking technology was mature, so the security of DVD Audio was questioned by manufacturers. In addition, SACD has the characteristic that it cannot be read by a computer. SONY, Philips and many of its record companies began to implement SACD, gradually becoming high-resolution<\/span> The war of musical specifications gains an advantage.<\/span><\/span><\/p>\n

In 2007, after DVD Audio released its last audio source album, it ended the high-resolution music specification competition on physical media.<\/span> Nevertheless, why SACD has not yet become a common specification in the market?<\/span> One of the reasons is that most consumers cannot distinguish the difference in sound quality between SACD and mainstream CD, and even SACD cannot play music through CD players. It must be equipped with a dedicated SACD player. At that time, the cost of SACD players was high, which further increased consumption.<\/span> People step into the threshold of SACD.<\/span><\/p>\n

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Since the rise of the iPod in the early 21st century, many major changes have taken place in the recording industry. Digital streaming music files have gradually replaced the traditional physical media. At this time, most of the digital streaming music files sold are destructively compressed mp3 or AAC files.<\/span> Mainstream.<\/span> Although there was still a huge gap in listening quality between digital streaming files and physical media at that time, the price and portability of digital streaming music files far exceeded that of physical media, and most consumers did not have the ability to distinguish clearly.<\/span> Therefore, under the trade-off between convenience and sound quality, digital streaming music files gradually gain market advantages.<\/span><\/p>\n

With the popularization of high-resolution audio equipment, some consumers are no longer satisfied with destructively compressed files.<\/span> In 2008, Hdtrack, an American online music company, first launched the download of high-resolution music files. After that, digital music files that were sold at a selling point that surpassed CD sound quality were gradually opened for purchase on major online music websites.<\/span><\/span><\/p>\n

Until 2014, the Japan Electronics and Information Industry Technology Association (JEITA) officially defined High-Resolution Audio. The video giant SONY vigorously promoted the “Hi-Res” trademark and announced the arrival of a new era of “Hi-Res”!<\/span><\/p>\n

JEITA’s definition of high-resolution music<\/span> <\/span><\/p>\n

Sampling frequency or sampling rate, one of the two must exceed the CD specification, and no one shall be lower than the CD specification.<\/span> The specification of CD is sampling frequency: 44.1kHz, bit depth: 16bit<\/span><\/span><\/p>\n

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