Search results
Results from the WOW.Com Content Network
The selection of the sample rate was based primarily on the need to reproduce the audible frequency range of 20–20,000 Hz (20 kHz). The Nyquist–Shannon sampling theorem states that a sampling rate of more than twice the maximum frequency of the signal to be recorded is needed, resulting in a required rate of greater than 40 kHz.
[81] [82]: sec. 2.6 An audio CD can represent frequencies up to 22.05 kHz, the Nyquist frequency of the 44.1 kHz sample rate. [ 83 ] There was a long debate over the use of 16-bit (Sony) or 14-bit (Philips) quantization , and 44,056 or 44,100 samples/s (Sony) or approximately 44,000 samples/s (Philips).
The decline in CD sales has slowed in recent years; in 2021, CD sales increased in the US for the first time since 2004, [63] with Axios citing its rise to "young people who are finding they like hard copies of music in the digital age". [64] It came at the same time as both vinyl and cassette reached sales levels not seen in 30 years. [65]
Other sampling rates include: 44.1 kHz (also known as CD Quality): Originated in the late 1970s with PCM adaptors, and is still a common sampling rate to this day, mostly due to CD's adoption of this sampling rate, defined in the Red Book standard in 1980. [6] A comparison of several sampling rates, depicting their dynamic ranges.
CD audio, for example, has a sampling rate of 44.1 kHz (44,100 samples per second), and has 16-bit resolution for each stereo channel. Analog signals that have not already been bandlimited must be passed through an anti-aliasing filter before conversion, to prevent the aliasing distortion that is caused by audio signals with frequencies higher ...
For music-quality audio, 44.1 and 48 kHz sampling rates are the most common. Master recording may be done at a higher sampling rate (i.e. 88.2, 96, 176.4 or 192 kHz). High-resolution PCM recordings have been released on DVD-Audio (also known as DVD-A), DualDisc (utilizing the DVD-Audio layer), or High Fidelity Pure Audio on Blu-ray.
1987; 38 years ago () Digital Audio Tape ( DAT or R-DAT ) is a signal recording and playback medium developed by Sony and introduced in 1987. [ 1 ] In appearance it is similar to a Compact Cassette , using 3.81 mm / 0.15" (commonly referred to as 4 mm) magnetic tape enclosed in a protective shell, but is roughly half the size at 73 mm × 54 mm ...
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.