1.0Embeddedhttps://www.em-company.fr/blogkrikohttps://www.em-company.fr/blog/index.php/author/jack/FFT based frequency calculation (algorithm) - Embeddedrich600338<blockquote class="wp-embedded-content" data-secret="EN6iUVdNKE"><a href="https://www.em-company.fr/blog/index.php/2017/11/03/fft-based-frequency-calculation/">FFT based frequency calculation (algorithm)</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://www.em-company.fr/blog/index.php/2017/11/03/fft-based-frequency-calculation/embed/#?secret=EN6iUVdNKE" width="600" height="338" title="“FFT based frequency calculation (algorithm)” — Embedded" data-secret="EN6iUVdNKE" 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://www.em-company.fr/blog/wp-includes/js/wp-embed.min.js
</script>
Determining the frequency of a sinusoidal waveform can be achieved using an FFT based method. If we restrain ourselves to the simple case where the waveform is made of one single sine wave, then the fundamental frequency (f0) is indeed what we call the “waveform frequency”. If that is the case, a simple FFT would … Continue reading ""