1.0EARS 2https://ears2.eu/csadminhttps://ears2.eu/cs/archives/author/adminrich600338<blockquote class="wp-embedded-content" data-secret="zi7g4aPXeB"><a href="https://ears2.eu/cs/encyclopediacs/contact-microphone">Contact Microphone</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://ears2.eu/cs/encyclopediacs/contact-microphone/embed#?secret=zi7g4aPXeB" width="600" height="338" title="„Contact Microphone“ — EARS 2" data-secret="zi7g4aPXeB" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script> /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); //# sourceURL=https://ears2.eu/wp-includes/js/wp-embed.min.js </script> A simple recording technology that allows sound vibration travelling through solid objects to be detected and recorded. Contact microhpones are made from piezoelectric crystals, which induce an electric current when they are vibrated. Often small and round, they can be stuck directly to objects.https://ears2.eu/wp-content/uploads/2013/03/radiator_piezo-01.png