Automatic filtering method and device

• US 10,644,676 B2
• Filed: 10/26/2017
• Issued: 05/05/2020
• Est. Priority Date: 12/15/2016
• Status: Active Grant

• Current Assignee: Omron Corporation
• Original Assignee: Omron Corporation
• Inventors: Zhang, Hao, Yu, Haibin, Duan, Liangyong, Xu, Lei
• Primary Examiner(s): Tadese, Berhanu
• Application Number:
  US16/465,761
• Publication Number:
  US 20190319608A1
• Time in Patent Office: 922 Days
• Field of Search: None
• CPC Class Codes: G01D 3/021 using purely analogue techniques
• CPC Class Codes: G01D 3/032 affecting incoming signal, e.g. by averaging; gating undesired signals
• CPC Class Codes: G01G 23/01 Testing or calibrating of weighing apparatus
• CPC Class Codes: G01G 3/147 involving digital counting
• CPC Class Codes: G01R 23/165 using filters
• CPC Class Codes: H03H 17/025 Notch filters
• CPC Class Codes: H03H 17/0255 Filters based on statistics adaptive filters H03H21/0029

Abstract

An automatic filtering method includes: a step of analyzing an input signal so as to obtain a frequency spectrum of the input signal; and a step of selecting, on the basis of the frequency spectrum, at least one filter from among a plurality of preset filters and filtering the input signal. The step of selecting includes determining, on the basis of the frequency spectrum of, a signal type in the input signal; selecting, on a basis of the signal type, a corresponding filter corresponding to the signal type; filtering the input signal with use of a first parameter of the corresponding filter and setting a second parameter for the corresponding filter on a basis of a result of the filtering; and filtering the input signal with use of the second parameter set for the corresponding filter. The method may ensure a filtering effect against noise.

Claims

1. An automatic filtering method, comprising the steps of:

(i) analyzing an input signal so as to obtain a frequency spectrum of the input signal; and

(ii) selecting, on a basis of the frequency spectrum of the input signal, at least one filter from among a plurality of preset filters and filtering the input signal,

the step (ii) including;

determining, on the basis of the frequency spectrum of the input signal, a signal type included in the input signal;

selecting, on a basis of the signal type included in the input signal, a corresponding filter corresponding to the signal type;

filtering the input signal with use of a first parameter of the corresponding filter and setting a second parameter for the corresponding filter on a basis of a result of the filtering; and

filtering the input signal with use of the second parameter set for the corresponding filter,

the setting of the second parameter for the corresponding filter on the basis of the result of the filtering including;

determining, on the basis of the result of the filtering, whether a type of signal which type corresponds to the corresponding filter has been filtered out;

in a case where the determining shows that the type of signal which type corresponds to the corresponding filter has been filtered out, setting the first parameter of the corresponding filter as the second parameter; and

in a case where the determining shows that the type of signal which type corresponds to the corresponding filter has not been filtered out, repeating a process of adjusting the first parameter of the corresponding filter and simulating a filtering result with use of the adjusted first parameter until the type of signal which type corresponds to the corresponding filter is filtered out and setting the adjusted first parameter as the second parameter.

2. The automatic filtering method according to claim 1, further comprising the steps of:

(iii) adjusting, on a basis of a fine adjustment measure fed back from a user, a parameter of the at least one filter selected; and

(iv) filtering the input signal again with use of the adjusted parameter of the at least one filter selected.

3. The automatic filtering method according to claim 1, wherein

the signal type included in the input signal includes a signal having an electric power source frequency, a high-frequency signal having a constant cycle and frequency, and a high-frequency signal having a non-constant cycle and frequency.

4. An automatic filtering device, comprising:

a signal processing unit configured to analyze an input signal so as to obtain a frequency spectrum of the input signal; and

a first filtering unit configured to select, on a basis of the frequency spectrum of the input signal, at least one filter from among a plurality of preset filters and filter the input signal,

the first filtering unit including;

a first determining unit configured to determine, on the basis of the frequency spectrum of the input signal, a signal type included in the input signal;

a first selecting unit configured to select, on a basis of the signal type included in the input signal, a corresponding filter corresponding to the signal type;

a second determining unit configured to filter the input signal with use of a first parameter of the corresponding filter and set a second parameter for the corresponding filter on a basis of a result of the filtering; and

a third filtering unit configured to filter the input signal with use of the second parameter set for the corresponding filter,

the second determining unit being configured to carry out

a task of determining, on the basis of the result of the filtering, whether a type of signal which type corresponds to the corresponding filter has been filtered out;

a task of, in a case where the determining shows that the type of signal which type corresponds to the corresponding filter has been filtered out, setting the first parameter of the corresponding filter as the second parameter; and

a task of, in a case where the determining shows that the type of signal which type corresponds to the corresponding filter has not been filtered out, repeating a process of adjusting the first parameter of the corresponding filter and simulating a filtering result with use of the adjusted first parameter until the type of signal which type corresponds to the corresponding filter is filtered out and setting the adjusted first parameter as the second parameter.

5. The automatic filtering device according to claim 4, further comprising:

an adjusting unit configured to adjust, on a basis of a fine adjustment measure fed back from a user, a parameter of the at least one filter selected; and

a second filtering unit configured to filter the input signal again with use of the adjusted parameter of the at least one filter selected.

6. The automatic filtering device according to claim 4, wherein

the signal type included in the input signal includes a signal having an electric power source frequency, a high-frequency signal having a constant cycle and frequency, and a high-frequency signal having a non-constant cycle and frequency.

7. A weight measuring unit, comprising:

an automatic filtering device according to claim 4, the automatic filtering device being configured to filter an input signal so as to obtain a weight measuring signal; and

a calculation module configured to calculate a weight on a basis of the weight measuring signal.