A communication apparatus to transmit a plurality of frames in a network, where each frame includes one or more symbols having a symbol length, includes a data processing unit. The amplifier circuit comprises a buffer amplifier which stabilizes an input signal and outputs a stabilized output signal. A branch node block can be in communication with a leaf node block. The ventilation chamber includes a radially inner leakage inlet, a radially outward leakage outlet and built in components that are dimensioned to as to provide a flame blocking function with regard to ignition of the leakage at the leakage inlet. Some of the pixel values of the recovered image corresponding to the current macroblock are stored and the recovered image is deblocking-filtered.