On at least two occasions, height inflation had become so high that reforms became necessary. In the early 17th century, Michael Praetorius reported in his encyclopedic syntagma musicum that the heights had become so high that the singers had suffered a heavy load of larynx and that the noisy and viola players complained of jagged strings. The standard language areas he cited show that the level of his time, at least in the part of Germany where he lived, was at least a small third higher than today. Solutions to this problem were sporadic and local, but in general they included the definition of separate standards for voice and organ (in German: Chorton, enlightened. `Chorton`) and for chamber sets (in German: Kammerton, bed. `Kammerton`). Where the two met, as for example in a cantata, singers and instrumentalists could perform from music in different touches. This system has kept pitch inflation in check for about two centuries.  The relative heights of the different notes in a scale can be determined by one of the multiple voting systems. In the West, the 12-note chromatic scale is the most common method of organization, and with the same temperament, it is now the most common method for optimizing this scale. In it, the height ratio between two successive notes of the scale is exactly the twelfth root of two (or about 1.05946).
Different methods. B musical voice training have been used in well-heated systems (such as the systems used in the time of Johann Sebastian Bach). The strongest opponents of the upward trend in tone were singers who complained that it weighed on their voices. It was mainly because of its protests that the French government passed a law on 16 February 1859 setting the A on the medium C at 435 Hz. It was the first attempt to standardize height on such a scale, and it was called normal tuning. It also became outside France a very popular pitch standard and was also known at various times as the French location, the mainland or the international place (the last of them not to be confused with the 1939 “international standard pitch” below). A conference held in Vienna in 1885 defined this value among Italy, Austria, Hungary, Russia, Prussia, Saxony, Sweden and Wurtemberg.  This was finally introduced into the Treaty of Versaille in 1919.  The normal pitch allowed the average C to be set at approximately 258.65 Hz. It is always possible that two sounds of indeterminate height are significantly higher or lower than between them. For example, a snare drum sounds higher than a bass drum, although both have an indeterminate pitch because their sound contains higher frequencies. In other words, it is possible and often easy to roughly distinguish the relative tones of two tones of an indeterminate pitch, but sounds of an indeterminate height do not correspond properly to a certain height.
A particular type of height often occurs in nature when clay reaches an observer`s ear directly from the source, and even after reflection of a reflective surface. This phenomenon is called “redoubling” because adding a true repetition of the original sound to itself is a sine qua non condition. To analyze the contribution to emotional assessments of acoustic properties related to sound, we examined 23 acoustic signal parameters of the Toolbox Stamp (Peeters et al., 2011), which include spectral, temporal and temporal audio descriptors. Initial hierarchical analyses of clustering and main components suggested reducing them to 17 descriptors due to high collinarity.