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A channel map is maintained by the Central device and may also be maintained by the Peripheral device. This is a table of data which indicates which channels are available for use and which are not. Implementations mark channels as used or unused according to how well each channel is performing in terms or errors and evidence of interference ...
In retransmission and flow control modes, L2CAP can be configured for reliable or asynchronous data per channel by performing retransmissions and CRC checks. Reliability in either of these modes is optionally and/or additionally guaranteed by the lower layer Bluetooth BDR/EDR air interface by configuring the number of retransmissions and flush ...
SBC is a digital audio encoder and decoder used to transfer data to Bluetooth audio output devices like headphones or loudspeakers. It can also be used on the Internet. [ 2 ] It was designed with Bluetooth bandwidth limitations and processing power in mind to obtain a reasonably good audio quality at medium bit rates with low computational ...
Apache Mynewt NimBLE is a full-featured, open source Bluetooth Low Energy 4.2 and 5.0 protocol stack written in C for embedded systems. NimBLE is one of the most complete protocol stacks, supporting 5.0 features including high data rate and extended advertising. The implementation supports all layers of the Bluetooth protocol.
1.5 — all of 1.4 plus specification corrections and clarifications to absolute volume control, browsing and other features [9] 1.6 — all of 1.5 plus browsing data and track information [10] Number of items that are in a folder without downloading the list; Support for transmitting cover arts through the BIP over OBEX protocol.
The actual maximum code rate allowed depends on the error-correcting code used, and may be lower. This is because Shannon's proof was only of existential nature, and did not show how to construct codes that are both optimal and have efficient encoding and decoding algorithms.
For instance, SATA revision 3.0 (6 Gbit/s) controllers on one PCI Express 2.0 (5 Gbit/s) channel will be limited to the 5 Gbit/s rate and have to employ more channels to get around this problem. Early implementations of new protocols very often have this kind of problem.
The American mathematician Richard Hamming pioneered this field in the 1940s and invented the first error-correcting code in 1950: the Hamming (7,4) code. [5] FEC can be applied in situations where re-transmissions are costly or impossible, such as one-way communication links or when transmitting to multiple receivers in multicast.