Thursday, October 19, 2006

Hugh Tripp and a Tizz demonstration you can do yourself

Hugh Tripp shows how you can do your own investigation of Tizz.

Cut a strip from one sheet of inkjet paper and fold it into a zig-zag like you see in Hugh's left hand.

Cut the remaining piece into a circle.

Listen to the sounds of these objects in a quiet, dry environment. Gently excite the round sheet by wiggling it. What do you hear?

Gently excite the zig-zag by wiggling it and compare the sound against the circle.

You will find one structure will generate more noise than the other one.

8 comments:

Brad Avenson said...

Maybe if the surface area of the two pieces were the same the amount of noise might be more similar, but the tension of the corregated bit is significantly less so the tone of the noise will be different.

Zach said...

Okay, I am going to have to check this out.

As a side note I have been reading your old blog posts over the last couple of days and really enjoyed everything. Your RCA project looks really cool.

Bob Crowley said...

Brad,

Yes you are right, but there is also more to it than that. It has to do with surface area for sure and that plays an important role as there is simply less area where turbulence and agitation take place. Tizz and the word "tizzy" mean "an agitated state" by the way!

But the more important phenomenon that you will notice when doing the paper experiment is a result of restricted lateral modes.

Try it and listen and let me know what you think.

Zach that's a nice picture of you.

Bob

Anonymous said...

I did it and the circl sounds like a saw blade really liek it sounds when you hit the side of saw. it is easy to see

Anonymous said...

I hear a high woosh sound almost like sheetmetal. This is with the circle. This is a surprise to me. How does it make that sound what vibrates it?

Anonymous said...

round makes a WOOOOSSSHHHH!!

gm

Anonymous said...

This is that ZZZZZZZZ sound in a LDC? If so, why should we have to listen to it?

Anonymous said...

The disk is like a cymbal. It has all kinds of resonances. Manufacturers go to lengths to reduce this. Dynamics don't have much of it, ribbons have none of it. Considering the channel is only about 8K in most instances, and nobody needs the sheet metal cutting ability of the condenser, it is time to retire the LDC. Amazing how many cling to the SHZZZZ sound on vocals, esp female vocals and it sounds like shit. Total tizzy shit.