January 31, 2018 by
People might find that the Bluetooth signal is not stable sometimes, and then it would affect the sound quality of the Bluetooth devices. You might hear the intermittent sound as the unstable Bluetooth signal; it would be blocked by many factors. The factors that would influence the Bluetooth signal should be concerned because these could help us to avoid the problem.
Bluetooth technology uses radio frequencies, or RFs, to send signals wirelessly from one device to another. When a Bluetooth device is in contact with another wireless device using the same band, the signal can be blocked. Metal objects and electrical equipment emitting strong RFs can also interfere with Bluetooth or block it entirely.
These are the major elements that have impacts on Bluetooth signal.
Wi-Fi and Other Wireless Devices
Many Wi-Fi access points use the same 2.4-GHz bandwidth as Bluetooth; they can often interfere with each other to the point where your Bluetooth device may not work properly. Most routers have an option to switch to the 5-GHz frequency. Other Bluetooth devices can also interfere with signals, so sometimes it's necessary not to be using several Bluetooth devices at once. Some cordless phones also operate on these frequencies, as do wireless speakers, cameras and wireless baby monitors. Some LCD monitors can also interfere, not because they use wireless technology, but because they can emit harmonic interference in the 2.4-GHz band, especially when you're using a laptop with the lid closed and an external monitor directly beside it.
Unintentional RF Radiators
Bluetooth is a robust communications technology insofar as it includes mechanisms for error-checking and correction. However, while minor sources of electromagnetic interference, such as personal computers, are unlikely to cause interference with Bluetooth signals, other devices that share the ISM band, including microwave ovens, can cause serious interference. In extreme circumstances, such as setting down a Bluetooth device close to a microwave oven while it is operating, interference can block Bluetooth signals altogether.
Some physical objects can interfere with RFs more than others. In the case of Bluetooth and Wi-Fi signals, the worst culprits are metal objects like filing cabinets, metal doors, refrigerators and even metal studs in walls. Plaster, concrete and bulletproof glass aren't as bad as metal, but can still interfere with Bluetooth signals, particularly if the objects are thick and the Bluetooth signal is weak. Water, bricks and marble have a medium capacity for blocking Bluetooth. At the bottom of the list are wood, glass and synthetic materials like plastic.
A Bluetooth receiver in a cellular phone can also be blocked by the cellular phone transmitter. Typical Global System for Mobile Communications (GSM) cellular phone transmitters output between one and three watts, but Bluetooth receivers are designed to operate with signals in the order of trillionths of a watt, or picowatts, so the receiver can be completely overwhelmed by the transmitter. Even in a best-case scenario, the GSM transmitter generates significant noise, which limits the range of Bluetooth communications.
Reference from: http://classroom.synonym.com/block-bluetooth-signal-17777.html
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