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Audio tracks are defined in the Red Book specification for CD Digital Audio (which was the first CD specification). One song or movement usually comprises one audio track, containing audio in the form of raw PCM samples in 16 bit/44.1 kHz resolution in 2 channels, and a subcode multiplexed with the audio data.
The audio data stream in an audio CD is continuous but has three parts. The main portion, further divided into playable audio tracks, is the program area. This section is preceded by a lead-in track and followed by a lead-out track. The lead-in and lead-out tracks encode only silent audio, but all three sections contain subcode data streams.
High-resolution audio (high-definition audio or HD audio) is a term for audio files with greater than 44.1 kHz sample rate or higher than 16-bit audio bit depth. It commonly refers to 96 or 192 kHz sample rates. However, 44.1 kHz/24-bit, 48 kHz/24-bit and 88.2 kHz/24-bit recordings also exist that are labeled HD audio.
The logical format of an audio CD (officially Compact Disc Digital Audio or CD-DA) is described in a document produced in 1980 by the format's joint creators, Sony and Philips. [91] The document is known colloquially as the Red Book CD-DA after the color of its cover.
The company was privately founded by David and Norman Chesky of the audiophile recording company Chesky Records, and is based in New York, NY. [2] The service was launched on March 21, 2008, initially offering only CD-quality 44.1 kHz audio files in AIFF format from a small offering of independent record labels, including audiophile record company catalogs from Chesky Records, Reference ...
The Blue Book is a compact disc standard that defines the Enhanced Music CD format, which combines audio tracks and data tracks on the same disc. E-CD/CD+/CD Extra (Enhanced) [21] – a standard jointly developed and published by Microsoft, Philips and Sony
High Definition Compatible Digital (HDCD) is a proprietary audio encode-decode process that claims to provide increased dynamic range over that of standard Compact Disc Digital Audio, while retaining backward compatibility with existing compact disc players. Originally developed by Pacific Microsonics, the first HDCD-enabled CD was released in ...
Those 74 minutes come from the maximum playtime that the Red Book (audio CD standard) specifies for a digital audio CD (CD-DA); although now, most recordable CDs can hold 80 minutes worth of data. The DVD and Blu-ray discs hold a higher capacity of data, so reading or writing those discs in the same 74-minute time-frame requires a higher data ...