公开(公告)号：US20180331674A1

公开(公告)日：2018-11-15

申请号：US15775850

申请日：2016-11-11

Applicant: DENSO CORPORATION

Inventor： Takasuke ITO ,  Shigeki OTSUKA ,  Kazuyoshi NAGASE

IPC: H03H17/02 ,  H04B3/20

CPC classification number: H03H17/028 ,  H03H7/01 ,  H03H17/02 ,  H03H17/0248 ,  H04B3/04 ,  H04B3/20

Abstract: A signal output device is provided in a communication apparatus. The communication apparatus communicates with a different one of the communication apparatus using a single line. The signal output device includes a signal output unit. The signal output unit includes a first filter and a second filter. The first filter is provided by a Bessel filter. The second filter is provided by a Chebyshev filter or a Butterworth filter. The signal output unit outputs a signal which is obtained by passing a predetermined signal through the first filter and the second filter. The signal output from the signal output unit has a pass characteristic of the first filter and a pass characteristic of the second filter. A cutoff frequency of the first filter is set to be lower than a cutoff frequency of the second filter.