Apparatus for detecting data transmission rate and method thereof

摘要

An apparatus for detecting a data transmission rate by recognizing an amount of real-time transmitted data and a changed amount of the data so as to allocate an appropriate bandwidth required to transmit/receive data in a system in which a serial bus such as an IEEE 1394 is implemented, is provided. The apparatus for detecting a data transmission rate through a serial bus includes a data transmission rate detecting unit for detecting a data transmission rate of bit stream data transmitted through a predetermined transmission line; a sampler for sampling a data transmission rate detected by the data transmission rate detecting unit at a predetermined period; a low-pass filter for low-pass filtering a value sampled by the sampler; an error detecting unit for detecting an error value in the data transmission rate of the transmitted bit stream data using the value sampled by the sampler and the low-pass filtered value; a first comparing unit for comparing the error value detected by the error detecting unit with a reference error level; an estimated data transmission rate output unit for outputting an estimated data transmission rate on the basis of the low-pass filtered value when the error value is smaller than the reference error level; and a second comparing unit for outputting the estimated data transmission rate from the estimated data transmission rate output unit only in a case where the estimated data transmission rate does not exist between an upper bound and a lower bound when the present operation mode is a transmit/receive tracking mode. Accordingly, the bandwidth of the serial bus such as the IEEE 1394 can be efficiently operated.