Numerous consumer products for instance wireless speakers are cutting the cable and offer ultimate freedom of movement. The buzz of cordless gizmos like cordless loudspeakers has caused a rapid rise of transmitters which broadcast in the most popular frequency bands of 900 MHz, 2.4 GHz and 5.8 Gigahertz and therefore wireless interference has turned into a serious problem.
Traditional FM transmitters usually work at 900 MHz and don’t have any certain method of dealing with interference nevertheless changing the transmit channel is a method to deal with interfering transmitters. Digital audio transmission is usually used by newer audio systems. The signal bandwidth is higher than 900 MHz transmitters and thus competition in these frequency bands is high. Frequency hoppers which include Bluetooth devices as well as numerous cordless telephones will hop throughout the entire frequency spectrum. Real-time audio has pretty strict requirements regarding reliability and low latency. A regularly used technique is forward error correction where the transmitter transmits extra data combined with the audio. Consequently, these products can easily broadcast 100% error-free even if there’s interference. Additionally, it requires a back channel to the transmitter. In situations of dropped packets, the receiver will inform the transmitter and the dropped packet is resent. As a result both the transmitter and receiver require a buffer in order to store packets. Employing buffers will cause a delay or latency in the transmission. A bigger buffer size improves the reliability of the transmission. Video applications, however, require the audio to be synchronized with the movie. Given that each receiver also requires transmit functionality, the receivers cost more to make and in addition use up more energy.
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