Patent ID: 9306774
Filing Date: 2016-04-05
CPC Classification: H04B,H04L

Claim Text:
1. A communication apparatus comprising: a generation unit to generate PAM (Pulse Amplitude Modulation) signals that indicate a plurality of different levels of values corresponding to data of a transmission target; a pulse shaping filter to receive an input that is the PAM signals generated by the generation unit and provide an output that is pulse-shaped PAM signals that correspond to the input of the PAM signals from the generation unit; and a converter to convert the pulse-shaped PAM signals from the pulse shaping filter into analog signals and provide the analog signals to a transmission line connected to an external apparatus, wherein the pulse shaping filter causes the converter to handle a reduced number of gradations by providing the output that is the pulse-shaped PAM signals corresponding to the input of the PAM signals from the generation unit according to one of two input and output relations that are a first input and output relation and a second input and output relation, the generation unit generates the PAM signals that indicate five different levels of values according to a PAM5 mode as the PAM signals corresponding to the data of the transmission target; the pulse-shaping filter provides the pulse-shaped PAM signals with thirteen levels of output values; and the converter is provided to handle up to sixteen gradations corresponding to four bits.