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There are three main frequency bands that the latest wireless loudspeakers work in: 900 MHz, 2.4 GHz and 5.8 GHz. A growing competition in those frequency ranges has led manufacturers to develop new strategies that are able to handle the higher amount of interference. One of which I’m going to explain in this article.
Adaptive frequency hopping is one of the most advanced techniques that works by searching the entire frequency spectrum to find channels that are being used by different transmitters. The frequencies that are filled are identified as vacant. Apart from the other channels that are vacant the hop set is defined as one or more frequencies that are not occupied. In the course of a cordless transmission the transmitter is using one of the free channel frequencies during a short time frame, typically for up to 10 milliseconds. Then , it changes to the next frequency channel in the hop-set. If the frequency channel changes between transmitter and receiver, both change to the next channel. This makes sure that both transmitters as and receiver transmit with the identical frequency. In this way, the hop set must be distributed to every receiver.
If a different wireless product is able to take over a channel, which is one of the frequencies that are in use The hop set must be changed. In such a situation the transmitter scans all channels continuously and keeps a list of channels that are clear. If an active channel gets occupied it is immediately removed by the transmitter that channel from the active hop set and chooses one of the available frequency channels to be part of the new hop set. A list of alternative channels allows that the set of hops to be modified quickly and this technique is highly efficient in avoiding interference and also limiting broadcasting to channels that are already occupied.
There are additional methods that are commonly used on top of adaptive frequency hop. These techniques also increase the durability of the wireless music transmission. Data buffering is an often used method. Data buffering was developed to protect against damage or loss of packets due to poor reception or multipath fade. Information packets delivered are identified with numbers. A 메이저놀이터 (often called CRC) is added to every packet. When the packet is transmitted, the transmitter stores recent information packets in the buffer it has built within. If a packet ends getting damaged or lost the receiver will to request the transmitter to retransmit the damaged or lost packet. This type of function needs a reverse channel as well as time slots in which each receiver is able to receive packets from the transmitter which is why this feature supports a restricted number of wireless receivers each transmitter.