https://www.allaboutcircuits.com/technical-articles/what-is-the-sinc-function-and-why-is-it-important-in-electrical-engineering/?fbclid=IwAR1LWbQcCyVjGbL4FDbV-1-Cwjocwtm-XklD4GydsvRr1TBbvJj_bEvlcIw