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The curve is much shallower in the high frequencies than in the low frequencies. This flattening is called upward spread of masking and is why an interfering sound masks high frequency signals much better than low frequency signals. [1] Figure B also shows that as the masker frequency increases, the masking patterns become increasingly compressed.
Sound intensity, also known as acoustic intensity, is defined as the power carried by sound waves per unit area in a direction perpendicular to that area, also called the sound power density and the sound energy flux density. [2] The SI unit of intensity, which includes sound intensity, is the watt per square meter (W/m 2).
Infrasound arrays at monitoring station in Qaanaaq, Greenland.. Infrasound, sometimes referred to as low frequency sound or incorrectly subsonic (subsonic being a descriptor for "less than the speed of sound"), [1] describes sound waves with a frequency below the lower limit of human audibility (generally 20 Hz, as defined by the ANSI/ASA S1.1-2013 standard). [2]
ASUS then released the Xonar HDAV 1.3, which was the first solution enabling loss-less HD audio bit streaming to AV receivers. [63] In May 2009, ASUS launched the Essence ST sound card, targeted at high-end audiophiles, and featuring 124 dB SNR rating and precision audio clock tuning. [64]
The two sound cards are the same; the Phoebus comes bundled with an external desktop controller that is not included with the Phoebus Solo. [19] [20] Xonar Phoebus Solo 22 April 2013 [19] Xonar SE PCIe July 2019 [21] Xonar STX PCIe Xonar U1 External (USB) Xonar U3 23 December 2014 [22] [23] Xonar U5 14 July 2014 [24] [25] Xonar U7 [26] April ...
Audio filters can also be designed to provide gain (boost) as well as attenuation. In other applications, such as with synthesizers or sound effects, the aesthetic of the filter must be evaluated subjectively. Audio filters can be implemented in analog circuitry as analog filters or in DSP code or computer software as digital filters.
The FAA specifications [19] have detailed requirements for when certain warnings should sound in the cockpit. The system monitors an aircraft's height above ground as determined by a radar altimeter. A computer then keeps track of these readings, calculates trends, and will warn the flight crew with visual and audio messages if the aircraft is ...
The loudness war (or loudness race) is a trend of increasing audio levels in recorded music, which reduces audio fidelity and—according to many critics—listener enjoyment. Increasing loudness was first reported as early as the 1940s, with respect to mastering practices for 7-inch singles . [ 1 ]