US 12,470,226 B2
Signal processing system, signal processing method, and non-transitory computer readable medium
Eizo Ichihara, Tokyo (JP); and Yusuke Kai, Tokyo (JP)
Assigned to Asahi Kasei Microdevices Corporation, Tokyo (JP)
Filed by Asahi Kasei Microdevices Corporation, Tokyo (JP)
Filed on Jan. 28, 2024, as Appl. No. 18/424,842.
Application 18/424,842 is a continuation of application No. PCT/JP2022/027331, filed on Jul. 11, 2022.
Claims priority of application No. 2021-145058 (JP), filed on Sep. 6, 2021; and application No. 2021-160654 (JP), filed on Sep. 30, 2021.
Prior Publication US 2024/0171187 A1, May 23, 2024
Int. Cl. H03M 1/06 (2006.01); H03M 1/12 (2006.01)
CPC H03M 1/0629 (2013.01) [H03M 1/12 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A signal processing system comprising:
an adaptive decimation filter apparatus which has a decimation filter which outputs an output signal obtained by down-sampling an input signal, and an aliasing noise detection unit which detects a magnitude of aliasing noise, which is folded back to a frequency lower than a Nyquist frequency in the output signal of the decimation filter by the down-sampling, on a basis of a characteristic of the input signal and a characteristic of the decimation filter; and
a signal processing apparatus which has a filter control unit which adjusts an order of the decimation filter on a basis of the magnitude of the aliasing noise, and an adaptive filter unit which performs filter processing on the output signal of the decimation filter;
wherein the adaptive filter unit performs the filter processing corresponding to the order of the decimation filter or the characteristic of the decimation filter;
wherein the filter control unit adjusts a phase of the output signal according to adjustment of the order of the decimation filter.