{"id":3798,"date":"2021-06-15T19:47:57","date_gmt":"2021-06-15T19:47:57","guid":{"rendered":"http:\/\/mp4gain.com\/mp4gain\/?p=3798"},"modified":"2021-06-15T19:47:57","modified_gmt":"2021-06-15T19:47:57","slug":"how-digital-compression-works-part-2","status":"publish","type":"post","link":"https:\/\/mp4gain.com\/mp4gain\/how-digital-compression-works-part-2\/","title":{"rendered":"How digital compression works. Part 2"},"content":{"rendered":"

How digital compression works. Part 2<\/strong><\/p>\n

\"digital<\/p>\n

The next after CDDA in 1987 appeared the DAT format – Digital Audio Tape.<\/p>\n

\"digital<\/p>\n

The sample rate was 48 kHz, the quantization bit did not change. And although the format failed, the 48 kHz sample rate took hold in recording studios, as they say, due to the convenience of digital processing.<\/p>\n

In 1999, the DVD-Audio format was released, which made it possible to record on a disc six stereo tracks with a sampling frequency of 96 kHz and a 24-bit bit depth, or two stereo tracks with a frequency of 192 kHz, 24 bits.<\/p>\n

In the same year, the SACD – Super Audio CD format was introduced, but the discs began to be produced only three years later. I will tell you more about this format in the DSD section.<\/p>\n

These are the main formats that are considered the standard for digital audio recordings on media. Now let’s see how data is transmitted on a digital audio path.<\/p>\n

The structure of the digital audio path.
\nWhen playing music, something like the following happens: the player, using a codec created in the form of a device or program, decompresses the file into a specific format (FLAC, MP3 and others) or reads data from a CD, DVD-Audio or disc SACD, receiving a standard PCM data stream … This stream is then transferred via USB, LAN, S \/ PDIF, PCI, etc., to the I2S converter. In turn, the converter converts the received data into so-called I2S data interface frames (not to be confused with I2C!)<\/p>\n

I2S
\nI2S is a digital audio transmission serial bus. Now I2S is a standard for connecting a signal source (computer, turntable) to a digital-to-analog converter. It is through it that the vast majority of the DAC connects directly or indirectly. There are other digital audio transmission standards, but they are much less common.<\/p>\n

I2S output (input) on PCB
\nI2S output (input) on PCB
\nOther articles in this issue:
\nXakep # 256. Fight Linux
\nBroadcast content
\nSubscription to “Hacker”
\nThe I2S bus can consist of three, four, or even five pins:<\/p>\n

continuous serial clock (SCK) – bit sync clock (can be called BCK or BCLK);
\nword selection (WS) – frame sync clock (may be called LRCK or FSYNC);
\nSerial data (SD): transmitted data signal (can be called DATA, SDOUT, or SDATA). As a general rule, data is transmitted from a transmitter to a receiver, but there are devices that can act as a receiver and transmitter at the same time. In this case, another contact may be present;
\nSerial data in (SDIN): On this pin, data moves in the receive direction, not the transmit direction.
\nSD or SDOUT is used to connect a D \/ A converter, and SDIN is used to connect an A \/ D converter to the I2S bus.<\/p>\n","protected":false},"excerpt":{"rendered":"

How digital compression works. Part 2 The next after CDDA in 1987 appeared the DAT format – Digital Audio Tape. The sample rate was 48 kHz, the quantization bit did not change. And although the format failed, the 48 kHz sample rate took hold in recording studios, as they say, due to the convenience of … Continue reading “How digital compression works. Part 2”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[22888,28067,22897,22895,22896,22901,22903,22899,43025,57136,62530,22909,22910,22920,62048,22921,22919,22940,22939,22938,22935,22936,22943,22907,22946,62531,22944,22913,22918,22916,22914,22925,22923,22891,15335,22949,22948,22950,22892,43024,22889,28075,60122,22890,22947,41194,22937,22932,22929,22953,47818,22917,22924,57137,28071,28088,28072,28087,28074,62532,28089,41199,22954,22905,62047,22908,58661,22958,22957,22956,43028,41202,22955,22959,22960,50676],"class_list":["post-3798","post","type-post","status-publish","format-standard","hentry","category-audio-video","tag-are-digital-audio-and-optical-the-same","tag-are-digital-audio-players-worth-it","tag-can-a-digital-audio-cable-go-bad","tag-can-digital-audio-be-converted-to-analog","tag-can-digital-audio-be-split","tag-can-dogs-hear-digital-audio","tag-can-you-convert-digital-audio-to-analog","tag-can-you-convert-digital-audio-to-rca","tag-can-you-split-digital-audio-signal","tag-cant-get-digital-audio","tag-digital-audio-piotr-has","tag-do-digital-audio-cables-go-bad","tag-do-digital-audio-converters-work","tag-does-digital-audio-cable-make-a-difference","tag-does-digital-audio-have-arc","tag-does-digital-audio-software-needs-magnetism","tag-does-digital-audio-support-5-1","tag-does-displayport-have-digital-audio","tag-does-imac-have-digital-audio-out","tag-does-ipad-have-digital-audio-output","tag-does-ps4-have-digital-audio-out","tag-does-roku-have-digital-audio-out","tag-does-xbox-one-have-digital-audio","tag-how-did-digital-audio-start","tag-how-digital-audio-system","tag-how-digital-audio-technology-works","tag-how-digital-audio-works","tag-how-do-digital-audio-filters-work","tag-how-do-digital-audio-systems-work","tag-how-do-digital-audio-work","tag-how-do-digital-audiobooks-work","tag-how-does-digital-audio-out-work","tag-how-does-digital-audio-work","tag-is-digital-audio","tag-is-digital-audio-analog","tag-is-digital-audio-better-than-analog","tag-is-digital-audio-better-than-hdmi","tag-is-digital-audio-cable-same-as-rca","tag-is-digital-audio-coaxial","tag-is-digital-audio-out-optical","tag-is-digital-audio-out-the-same-as-optical","tag-is-digital-audio-out-the-same-as-toslink","tag-is-digital-audio-output-optical","tag-is-digital-audio-output-the-same-as-optical","tag-is-digital-audio-the-same-as-optical","tag-is-digital-audio-workstation-free","tag-tv-doesnt-have-digital-audio-out","tag-tv-has-digital-audio","tag-tv-only-has-digital-audio-out","tag-what-digital-audio-output","tag-what-do-digital-audio","tag-what-do-digital-audio-mean","tag-what-does-digital-audio-out-mean","tag-what-does-digital-audio-output-pcm-mean","tag-what-is-digital-audio","tag-what-is-digital-audio-broadcasting","tag-what-is-digital-audio-out","tag-what-is-digital-audio-output-on-tv","tag-what-is-digital-audio-s-pdif","tag-what-is-digital-audio-s-pdif-windows-10","tag-what-is-digital-audio-workstation","tag-what-should-digital-audio-output-be","tag-whats-digital-audio","tag-when-did-digital-audio-recording-begin","tag-when-did-digital-audio-workstation-begin","tag-when-did-digital-optical-audio-come-out","tag-when-to-use-optical-digital-audio-cable","tag-where-is-the-digital-audio-output-on-a-samsung-tv","tag-which-digital-audio-cable-is-best","tag-which-digital-audio-format-is-best","tag-which-digital-audio-player","tag-which-digital-audio-recorders","tag-which-digital-audio-workstation-is-best","tag-why-digital-audio-is-better-than-analog","tag-will-rca-cable-work-digital-audio","tag-xbox-have-digital-audio"],"yoast_head":"\nHow digital compression works. Part 2 - mp4gain.com<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mp4gain.com\/mp4gain\/how-digital-compression-works-part-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How digital compression works. Part 2 - mp4gain.com\" \/>\n<meta property=\"og:description\" content=\"How digital compression works. Part 2 The next after CDDA in 1987 appeared the DAT format – Digital Audio Tape. The sample rate was 48 kHz, the quantization bit did not change. And although the format failed, the 48 kHz sample rate took hold in recording studios, as they say, due to the convenience of … Continue reading "How digital compression works. 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