![]() ![]() This "transmission" doesn't occur by any magic. Sound is produced by the transmission of the vibrations produced in the vocal fold, to the air in the vocal tract. So our vocal folds continue to vibrate at the same frequency in helium as in normal air.Ģ. This is a neuromuscular process and is NOT affected by Helium or any other gas (at least in the short term). The frequency generated by the vocal folds depends on the tension exerted on them and surrounding muscles. Reception and perception of sound by another human.ġ.Transmission of energy from the end of the vocal tract (mouth) to the surrounding medium.Resonance and Attenuation in the vocal tract.Transmission of energy from vocal folds to air in the vocal tract.We'll then proceed to explain each part using a few different examples and pieces of derivative logic: In order to properly understand this without any unnecessary "controversy", let's break the whole process of sound generation and perception into 5 important, but completely separate parts. This should be explainable by physics, what is the answer? There also appears to no consensus on whether a LISTENER in a helium atmosphere would hear the same frequencies as normal (it's helium all the way so it shouldn't make any difference right?) OR hear the squeaky voices associated with helium. For example, the university article simply says - "Inhaling helium changes the frequencies of the resonances, and therefore of the formants they produce" - Okay, how? The above appears to completely contradict the source university article as well as this other article in Scientific American that say the pitch of the sound (and the actual frequency of oscillations) doesn't change, only the timbre (and the distribution of power between low and high frequencies) changes.Īdditionally, neither the university article quoted nor Scientific American explain HOW the presence of helium leads to the presence of higher frequencies. One of the top Google results from a site called Live"Science", says - ".their wavelengths stay the same regardless of whether the tract is filled with helium gas or air.That means the frequencies of the resonant harmonics must increase in a helium-filled cavity instead." I recently Googled this, and found a ton of articles with confusing explanations: I'm classifying this as a physics question, since it has to do with resonances, attenuation, etc. Sonic Visualiser is an impressive free tool for musicians that will aid music learning and analysis of audio files.This question (and answer) is an attempt to clear the air on what appears to be a very simple issue, with conflicting or unclear explanations on the internet. ![]() Unfortunately though, Sonic Visualiser cannot support VST plugins directly because Steinberg's VST license is incompatible with Sonic Visualiser's GPL license although both Mac and Windows users can get support using the Audacity VST Enabler. It can load audio files in WAV, Ogg and MP3 formats, view their waveforms in spectrograms and allows you to annotate audio data by adding time points and markers. Although its free, Sonic Visualiser is very powerfu. Sonic Visualiser can use LADSPA and DSSI effects plugins and Windows users are at a slight advantage over Mac users as they can download some LADSPA plugins from the Audacity plugin page. ![]()
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