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Spread-Spectrum Frequency Hopping
Spread-spectrum frequency hopping is used by Bluetooth to communicate with multiple devices at one time. Using this technique, Bluetooth can transmit information to up to eight devices at once without unwanted interference getting in the way. Spread-spectrum frequency hopping involves switching between 79 different frequencies regularly and randomly. This switch happens 1,600 times every second. This constant switching results in connected devices utilizing only a small portion of the available radio wave spectrum, and due to this significantly decreases the chances of interference among the devices. Spread-spectrum frequency hopping also ensures that if any interference does happen, it will only last a fraction of a second before the Bluetooth changes frequencies again. Any device that uses Bluetooth technology automatically uses spread-spectrum frequency hopping.
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