Title:
デジタルフィルタ、信号処理装置および通信機
Document Type and Number:
Japanese Patent JP6808296
Kind Code:
B2
Abstract:
To provide a digital filter, a signal processing device and a communication instrument that can remove a direct current component and a low frequency component while maintaining signal quality of a rectangular wave signal due to ΔΣ modulation.SOLUTION: A digital filter, a signal processing device and a communication instrument comprise: an up-sampler 21 that performs up-sampling of a bandpass ΔΣ modulated signal to a predetermined sample rate by inserting 0 between samples of a signal and that generates an up-sampling signal by inserting 0 between samples of the signal; and a delay unit 22 and a subtracter 23 that attenuate a direct current component and a frequency band near the direct current component by subtracting between the up-sampling signal at the present time obtained from the up-sampler 21 and the up-sampling signal before odd number samples.SELECTED DRAWING: Figure 3
Inventors:
Yasuhiko Naito
Masaki Tatemori
Koichi Hasegawa
Masaki Tatemori
Koichi Hasegawa
Application Number:
JP2017098007A
Publication Date:
January 06, 2021
Filing Date:
May 17, 2017
Export Citation:
Assignee:
Japan Radio Co., Ltd.
International Classes:
H03H17/02; H03H17/00; H03M7/32
Domestic Patent References:
| JP10075177A | ||||
| JP2004336703A |
Attorney, Agent or Firm:
Harushima Shigetokiro