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Psychoacoustics is the branch of psychophysics involving the scientific study of the perception of sound by the human auditory system. It is the branch of science studying the psychological responses associated with sound including noise , speech , and music .
A440 Play ⓘ. 440 Hz = 4.21 or 4.39. The Bark scale is a psychoacoustical scale proposed by Eberhard Zwicker in 1961. It is named after Heinrich Barkhausen, who proposed the first subjective measurements of loudness. [1]
with Ernst Terhardt als Herausgeber: Facts and models in hearing. Proceedings of the Symposium on Psychophysical Models and Physiological Facts in Hearing. Held at Tutzing, Oberbayern, April 22–26, 1974. Springer, Berlin [u.a.] 1974; Psychoakustik. Springer, Berlin [u.a.] 1982, ISBN 3-540-11401-7; with Manfred Zollner: Elektroakustik.
A complete model of the perception of loudness will include the integration of SPL by frequency. [ 5 ] Historically, loudness was measured using an ear-balancing method with an audiometer in which the amplitude of a sine wave was adjusted by the user to equal the perceived loudness of the sound being evaluated. [ 6 ]
For multi-component or broadband signals, a more elaborate loudness model is required, accounting for critical bands. To be fully precise, a measurement in sones must be specified in terms of the optional suffix G, which means that the loudness value is calculated from frequency groups, and by one of the two suffixes D (for direct field or free ...
One filter type used to model the auditory filters is the gammatone filter. It is a simple linear filter and therefore is easy to implement, but cannot by itself account for nonlinear aspects of the auditory system; it is nevertheless used in a variety of models of the auditory system. Variations and improvements of the gammatone model of ...
One example of a popular song that was recorded with MaxxBass processing is "Lady Marmalade", the 2001 Grammy award-winning version sung by Christina Aguilera, Lil' Kim, Mýa, and Pink, produced by Missy Elliott. [26] Other software and hardware companies have developed their own versions of missing fundamental-based bass augmentation products.
In this process, there is a block called "Psychoacoustic model". This is communicated with the band filter and the quantify block. The psychoacoustic model analyzes the samples sent to it by the filter band, computing the masking threshold in each frequency band using a Fast Fourier transform. The number of points used depends upon the MPEG layer.