The science of sound


SYOS process is based on the combination of two different disciplines: musical acoustics and psychoacoustics. SYOS mouthpieces were developed after 5 five of research in these two domains. Today, SYOS offers an infinity of new geometries to the musicians, which allows to shape the sound aesthetics regardless of the material used to make the mouthpiece.



Musical Acoustics





Musical Acoustics


What's musical acoustics?

Musical acoustics is the scientific fields dedicated to the study of musical instruments. Right between wave physics and music, this domain stem from antiquity and especially from Pythagore's work on music strings. The Greek philosophers already established physical dependences between the length of a string and the pitch of the sound produced by the string. Today, scientific knowledge and tools have evolved and we are now able to simulate and model physical events (air flow, pressure drop, resonance...) inside the instruments.

Researches in musical acoustics bring a deep understanding of the instruments and allow us to improve their quality, by studying vibration properties and acoustic radiations, and by modelling the relation between the musician and the instrument. Computational models are created with the help of simulation softwares and validated by experiments on real musical instruments.


Can the sound of instruments be predicted?

The tune accuracy, the timbre and the easiness to play are fundamental parameters when making musical instruments. These characteristics can be predicted, at least partially, by the measure or the calculation of the input acoustic impedance of the instrument. This physical quantity corresponds to the ratio of acoustic pressure to the air flow at the input of the instrument. The acoustic impedance at a particular frequency indicates how much sound pressure is generated by a given air vibration at that frequency. For a given pressure excitation (like trumpeter's lips or reed's vibration), impedance peaks are observed at the frequencies for which the air column inside the instrument and the excitation device are well matched: these are the air column resonance frequencies.

For instance, the figure on the left represent the acoustic impedance of a trumpet playing the open fingering. The allowed notes are Bb2 (233 Hz), F3 (349 Hz), Bb3 (466 Hz), D4 (587), F4 (698 Hz), ...


How does it relates to the instrument sound quality?

The frequencies of the different peaks on the above figure correspond to the frequencies of the notes. The measure of the impedance is then an indicator of the accuracy of the instrument. The global tuning of the instrument can thus be predicted without playing it. Acoustic impedance also gives information on timbre and easiness to play. For a given fingering, the number and the distribution of the peaks is an indicator of the harmonic richness of the note. The amplitude of the peaks is related to the instrument resistance: if the peak is low, the musician will have to blow much more in the instrument to play the note than if the peak is high.

SYOS mouthpieces are created in a way that acoustic impedance is optimized whatever the playing conditions and the sound aesthetics are, which guarantee accuracy and easiness to play from low frequencies to high frequencies. Are you curious to hear the result? Test SYOS mouthpieces quality and enjoy the comfort they provide!