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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.
Real Audio 32 kbit/s stereo music codec in Helix Producer 10; QDesign Music Codec 2 Pro 32 kbit/s at 32 kHz, Quality mode; Microsoft WMA9 Std 32 kbit/s at 32 kHz; mp3PRO 32 kbit/s at 32 kHz, in Adobe Audition 1.5; Various 18 47-77 Nero HE-AAC: HydrogenAudio user "guruboolez" 2004 July multiple ~175 MPC: musepack-standard; MP3: LAME 3.97 alpha-V ...
Bit rate is the product of the sample rate and number of bits per sample used to encode the music. CD audio is 44100 samples per second. The number of bits per sample also depends on the number of audio channels. The CD is stereo and 16 bits per channel. So, multiplying 44100 by 32 gives 1411200—the bit rate of uncompressed CD digital audio.
Each sample represents the amplitude of the signal at a specific point in time, and the samples are uniformly spaced in time. The amplitude is the only information explicitly stored in the sample, and it is typically stored as either an integer or a floating-point number, encoded as a binary number with a fixed number of digits – the sample's ...
The 'Music' category is merely a guideline on commercialized uses of a particular format, not a technical assessment of its capabilities. For example, MP3 and AAC dominate the personal audio market in terms of market share, though many other formats are comparably well suited to fill this role from a purely technical standpoint.