US 11,838,157 B2
Signal processing device, signal processing method, and signal processing program
Hideaki Emoto, Yokohama (JP); and Mitsuyuki Shirae, Yokohama (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Appl. No. 17/782,310
Filed by MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
PCT Filed Nov. 18, 2020, PCT No. PCT/JP2020/042904
§ 371(c)(1), (2) Date Jun. 3, 2022,
PCT Pub. No. WO2021/117433, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 2019-222173 (JP), filed on Dec. 9, 2019.
Prior Publication US 2022/0385506 A1, Dec. 1, 2022
Int. Cl. H04L 27/14 (2006.01)
CPC H04L 27/14 (2013.01) 7 Claims
OG exemplary drawing
 
1. A signal processing device for processing a frequency signal having a first frequency or a second frequency higher than the first frequency, comprising:
an acquisition circuit configured to acquire signal waveform data corresponding to the frequency signal;
a generation circuit configured to generate a sine wave and a cosine wave of demodulation waveform data having a demodulation frequency between the first frequency and the second frequency;
a first phase calculation circuit configured to calculate a first phase based on a multiplication result of the sine wave and the signal waveform data at a first time and a multiplication result of the cosine wave and the signal waveform data at the first time;
a second phase calculation circuit configured to calculate a second phase based on a multiplication result of the sine wave and the signal waveform data at a second time advanced from the first time by a specified time interval less than one cycle of the demodulation frequency and a multiplication result of the cosine wave and the signal waveform data at the second time; and
a conversion circuit configured to output a signal value of the acquired frequency signal, based on comparison between the first phase and the second phase.