I love your presentation of explaining DSP.

Hi! I stumbled upon your channel a while ago, looking for onset detection examples, and I was impressed by your precision and clarity! I'm not really into mics, but it's still very interesting to watch. KZfaq should recommend your videos more! Thanks 🙏

very nice content, good job

Such a clear explanation!

I love these video's about contact mics! I am building an active cajon with home made contact mics so I try to get as much of this kind of information first.

So, to be clear it really is NOT the actual AcT of attaching the piezo to anything but the state of the piezo being attached to something that causes the change.lol thanks.

Awesome content! Thanks for the effort, You make internet better

Where were you able to find such large piezos? Did you make them at home? Briefly what use did you use them for. I'm Italian and I don't speak English but I can do,I equally get an 'idea by seeing the video. I need to detect sounds oise from surfaces or partition walls at my home whether it is a villa or a classic apartment building. I am waiting for info. Thank you very much.

Fantastic!!!

Brilliant!

the last experiment was "disappointing" (in the sense that the response was not A + B) but highly effective to demonstrate your point

Hey, it is possible to create an active vibration cancellation device using two piezo discs? I'm thinking of active damping of the head of my record player arm.

super cool

that’s very interesting !

A couple questions: 1) I know piezo is meant for contact, but it should also be possible to use them as conventional mics/speakers if installed in, say, a 3D printed housing, and/or using an acoustic amplifier horn, similar to an old phonograph. Two such instruments, facing each other but physically decoupled from one another, should allow you to evaluate the frequency response of disparate piezos without having to worry about combining their masses in such a way that the frequency response of both is altered. Have you considered trying this? 2) Have you considered inverting the EQ curve to create a digital filter preset that gives the Marshmallow a flat frequency response? I imagine this could be of use to your customers. I know the curve changes depending on what it's attached to, but if you taped your two transducers to, say, a typical acoustic guitar, maybe dampen the strings with a piece of felt, and run your white noise through it, I bet you could establish a pretty accurate EQ curve for a typical use case. Being able to restore the full, natural tone of a guitar with a simple software plugin could be useful. As always, fantastic work, man!!

Does the earmark at the end of my video sound like a toilet flushing?

Rad! But... what does it sound like 😂

It is probably better to model this with an additional transfer function - that of disk A -> B which represents the vibration transfer. When you compounded the transfer functions, you unfortunately cannot add their decibel magnitudes since it does not account for phase differences, so you will need to compute 20log(A(w)*B(w)) with A,B complex, which is not equal to 20log|A| + 20log|B| (the adding of response decibel magnitudes).

Interesting, I like the fact you look at things overlooked by normal understandings. I looked (very hard) at how we perceive auditory directional cues simply by using two microphones (before I was aware of binaural microphones!) and I tried and failed at many attempts, although left and right was achieved quite easy, above and below, in front and behind was unachievable, months of brainstorming finally gave me an ureaka moment and I sat bolt upright in bed (brainstorming area) and said out aloud "it's your bloody ears!" so I've never looked back since, though I still brainstorm on the pinna and the certain areas of the pinna and try to work out the parts that do what. There are auditory cues that we "don't hear" like the notch filtering effects, and resonances of reflected sounds from the different parts of the pinna, it's a very complicated area i guess unless you are aware of these "unheard tones" that our brain instantly recognises as "up there" over there "behind you", so much so that replication of auditory cues can trick the brain to feel breath on your face or the ground shaking when a recording of a train goes past, or the whisper of someone right next to your face - IF - the ears are of the correct shape for the listener as was used in the recording. I have noticed HRTF spouted for this that and the other all the time, and as I wasn't educated within audio I have not had this thrown down my neck so have realised the function without brainwashing and conducted tests to realise the head is unimportant for binaural recordings to be effective, it enhances it somewhat, but is unimportant. Though, try telling that to an educated person, and they will flame you, block you and whatever else they do to protect their brainwashed information of the "truth" that the head is everything!

1to 3m onms