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<p><a href="page.php?w=garage_door_opener">garage door opener</a>s,  and low frequency radio transmission in the <a href="page.php?w=very_low_frequency">VLF</a> and <a href="page.php?w=extremely_low_frequency">ELF</a> bands.  The simplest FSK is <b><a href="page.php?w=Binary_numeral_system">binary</a> FSK</b> (<b>BFSK</b>, which is also commonly referred to as <b>2FSK</b> or <b>2-FSK</b>), in which the carrier is shifted between two discrete frequencies to transmit binary (0s and 1s) information.</p>

<p><big>Modulating and demodulating</big></p>
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