The Kinkiness of a Vibrating String

Here’s a super-slow-motion video of a vibrating violin string:

Video by Jost Fischer.

I think this is pretty cool — there’s this kink that’s travelling up and down the length of the string.  What’s going on here, and why don’t we see this with the naked eye?  In this post I’ll explain how a bowed string vibrates, and how, unintuitive as it seems, the odd kinky motion of the Read the rest

Why Inhaling Helium Makes You Sound Like a Chipmunk

Here’s a novel idea from the King’s College Choir:

 

In the video, one of the choristers gets help hitting a high note by taking a breath from a large helium balloon. (Obligatory warning: it’s dangerous to try this at home.)  So… does this actually work?  Does inhaling helium really make your voice higher?

In an earlier post, we looked at how the pitch of your voice depends on Read the rest

Digitally Transforming a Female Voice to a Male Voice

Here’s a recording of a woman reciting a line from the Catalan poem La Vaca Cega:

Speech-female.wav by xserra / CC BY.

Suppose that you wanted to take the recording and change the quality of the voice — change it into a male-sounding voice, for instance.  How would you go about it?  I did this recently for an online audio processing course I took, Read the rest

The Fourier Transform and the Spectrum

Sine waves combining to form a violin waveform.

In What Makes a Musical Sound Part 2, I talked about the spectrum, which shows what frequencies are present in a sound.  In this explicative post, I’ll go into more detail about how we obtain the spectrum, and about what it means when we say a sound is made up of different frequencies.

Sine Waves

But first – what does Read the rest