Community hub
Recent from talks
Knowledge base stats:
Talk channels stats:
Members stats:
48,000 Hz
In digital audio, 48,000 Hz (also represented as 48 kHz or DVD Quality) is a common sampling rate. It has become the standard for professional audio and video.
48 kHz is evenly divisible by 24, a common frame rate for media, such as film, unlike 44.1 kHz.
In the late 1970s, digital audio didn't yet have a standard for a sampling rate, with proprietary sampling rates ranging from 32 kHz up to 50 kHz.
As the use of digital audio increased, it became apparent that standardization on a single sampling rate was needed, which started to be worked on in 1981.
A variety of requirements had to be considered before deciding on a sampling rate. Principally, the sampling rate had to be at least double the maximal frequency carried (as per the Nyquist–Shannon sampling theorem) — at least 40 kHz to roughly cover all human-audible frequencies without aliasing distortion.
The sampling rates under consideration ranged between 45 kHz and 60 kHz. 60 kHz would have been the ideal sampling rate for film and video use because it would have a complete absence of leap frames, but from the professional audio-only recording perspective, it was considered wastefully high.
To synchronize digital audio with television and film, there were five sampling rates available, that had leap frames but were not too high, which were as follows: 45, 48, 50, 52.5, and 54 kHz. European television chose 48 kHz due to them already broadcasting in 32 kHz, which corresponded to a 3:2 ratio, which made conversion easy, with no leap frames. As for NTSC television, they had two choices: 48, or 50 kHz. Ultimately, they chose 48 kHz, because there would be a leap frame every 5 frames, unlike 50 kHz, which would have a leap frame every 3 frames of color and b/w NTSC video, because European television was already using 48 kHz, and because it was easy to synchronize with 24 frames per second, a common frame rate used in television, and video.
Humans can't easily hear the difference between 48, 44.1 kHz, and other similar sampling rates. One benefit that 44.1 kHz provides is that it is easier to work with, requiring fewer computer resources, simply because it has fewer samples per second, which also results in smaller file sizes. However, a 44.1 kHz to 48 kHz conversion process may cause quality loss (a 48 kHz to 44.1 kHz conversion process is also), because 48 kHz divided by 44.1 kHz is not an integer.[self-published source?]
Hub AI
48,000 Hz AI simulator
(@48,000 Hz_simulator)
48,000 Hz
In digital audio, 48,000 Hz (also represented as 48 kHz or DVD Quality) is a common sampling rate. It has become the standard for professional audio and video.
48 kHz is evenly divisible by 24, a common frame rate for media, such as film, unlike 44.1 kHz.
In the late 1970s, digital audio didn't yet have a standard for a sampling rate, with proprietary sampling rates ranging from 32 kHz up to 50 kHz.
As the use of digital audio increased, it became apparent that standardization on a single sampling rate was needed, which started to be worked on in 1981.
A variety of requirements had to be considered before deciding on a sampling rate. Principally, the sampling rate had to be at least double the maximal frequency carried (as per the Nyquist–Shannon sampling theorem) — at least 40 kHz to roughly cover all human-audible frequencies without aliasing distortion.
The sampling rates under consideration ranged between 45 kHz and 60 kHz. 60 kHz would have been the ideal sampling rate for film and video use because it would have a complete absence of leap frames, but from the professional audio-only recording perspective, it was considered wastefully high.
To synchronize digital audio with television and film, there were five sampling rates available, that had leap frames but were not too high, which were as follows: 45, 48, 50, 52.5, and 54 kHz. European television chose 48 kHz due to them already broadcasting in 32 kHz, which corresponded to a 3:2 ratio, which made conversion easy, with no leap frames. As for NTSC television, they had two choices: 48, or 50 kHz. Ultimately, they chose 48 kHz, because there would be a leap frame every 5 frames, unlike 50 kHz, which would have a leap frame every 3 frames of color and b/w NTSC video, because European television was already using 48 kHz, and because it was easy to synchronize with 24 frames per second, a common frame rate used in television, and video.
Humans can't easily hear the difference between 48, 44.1 kHz, and other similar sampling rates. One benefit that 44.1 kHz provides is that it is easier to work with, requiring fewer computer resources, simply because it has fewer samples per second, which also results in smaller file sizes. However, a 44.1 kHz to 48 kHz conversion process may cause quality loss (a 48 kHz to 44.1 kHz conversion process is also), because 48 kHz divided by 44.1 kHz is not an integer.[self-published source?]