(level of sound) : an apparent, subjective acoustic scale which takes account of the variable human sensitivity to different sound frequencies; there are two loudness units of measurement: phon and sone. Phon is defined as loudness of 1000 Hz sound at the sound pressure level of 20 µPa; see [HANDBOOK]. Loudness level of a sound, expressed in phons, is numerically equal to the sound pressure level, expressed in decibels, of the 1000 Hz sound judged by listeners to be equivalent in loudness. Sone is defined as loudness of 1000 Hz sound, 40 dB above a listener's threshold. Loudness level of a sound, expressed in sones, measures a loudness level above threshold for a particular listener; for that reason, the threshold (measured or assumed) should be always specified. decibel (dB) games : tennis
Boosts low frequencies. Useful at low volumes but most loudness circuits can cut off an unacceptable amount of treble.
Perception of loudness as perceived by the recipient.
the intensity of a sound wave compared to a set standard, namely, the lowest threshold of human hearing.
This circuit is designed to compensate for the insensitivity of our ears to low and high frequencies at low volumes. Engaging this feature at low volumes will make the music sound more full. Many loudness circuits will reduce their effect as the volume increases.
Sound volume as it is detected by the average human ear. Hearing is non-flat, and this non-flatness varies with changes in absolute SPL (Sound Pressure Level).
This is the intensive attribute of an auditory sensation, in terms of which sounds may be ordered on a scale extending from quiet to loud
the magnitude of sound (usually in a specified direction); "the kids played their music at full volume"
amplitude rating of a sound
The perceptual correlate of sound level. Subjective perception of loudness is highly non-linear. Doubling or halving loudness requires about 10 dB change in sound level at middle and high frequencies. At low frequencies, it can be as little as 4 dB. The smallest audible change in overall loudness level is about 1 dB dB is just nicely audible. Loudness also depends on the frequency, bandwidth and duration of the sound. See: Equal Loudness Contours.
the auditory property of a sound that enables a listener to place it on a scale going from soft to loud without considering the acoustic properties, such as the intensity of the sound. (LC:294)
A listener's auditory impression of the strength of a sound. The average deviation above and below the static value due to a sound wave is called sound pressure. The energy expended during the sound wave vibration is called intensity and is measured in intensity units. Loudness is the physical resonance to sound pressure and intensity.
Another term for volume.
A person's subjective perception of the volume of sound. A 10dB increase in sound energy is generally perceived as a doubling in loudness.
Perception of the intensity of a sound.
The judgment of the intensity of a sound by a person. Loudness depends primarily on the sound pressure of the stimulus. Over much of the loudness range, it takes about a threefold increase in sound pressure (approximately 10 decibels) to produce a doubling of loudness.
A type of frequency correction applied in some amplifiers to correct for the non-linearity of human hearing and low volume levels. The first Walkman to offer this was the WM-DD100. The action of the loudness circuit was difficult to explain to the non-technical customer, so in later models it was given the name "Mega Bass". Text copyright © Walkman Central. Unauthorised reproduction prohibited. See also: Mega Bass
A subjective term for the sensation of the magnitude of sound.
The loudness of a sound depends on the amplitude
An equalization circuit used in some head units that progressively emphasizes low frequencies and sometimes high frequencies as volume is reduced; can be switchable (on, off), adjustable or automatic.
Perceived volume. Loudness can be deceiving. For example, adding distortion will make a given volume level seem louder than it actually is. M-N-O Magnetic-Planar Speakers: A type of speaker that uses a flat diaphragm with a voice coil etched or bonded to it to radiate sound. If the magnets are both in front of and behind the diaphragm, it becomes a push-pull magnetic-planar.
Our perceived impression of the intensity, frequency, and duration of a sound.
The strength of the physical resonance of a sound to sound pressure and intensity, as experienced by a listener.
the amount of energy a sound has
An intensity dimension of hearing correlated with the amplitude of the sound waves that constitute the stimulus. Greater amplitudes yield greater loudnesses. See also pitch, timbre.
A signal processing feature which compensates for the human ear's deficiencies at various listening levels.
An amount of sound perceived by the listener. Compare this definition to volume, which refers to an amount of sound produced.