Signal processing device, control method thereof, control procedure and recording medium

• US 10,257,000 B2
• Filed: 12/13/2016
• Issued: 04/09/2019
• Est. Priority Date: 01/29/2016
• Status: Active Grant

• Current Assignee: Omron Corporation
• Original Assignee: Omron Corporation
• Inventors: Miyake, Hiroki, Kojima, Toshiyuki
• Primary Examiner(s): Bayard, Emmanuel
• Application Number:
  US15/376,679
• Publication Number:
  US 20170222839A1
• Time in Patent Office: 847 Days
• Field of Search: 375284-285, 375343, 375346, 375350
• CPC Class Codes: G01D 3/032 affecting incoming signal, e.g. by averaging; gating undesired signals
• CPC Class Codes: H04L 25/03299 with noise-whitening circuitry
• CPC Class Codes: H04L 43/028 by filtering

Abstract

The invention is adapted to properly suppress noises of various frequency bands. An input unit (10) includes an acquiring element (11) for periodically acquiring signals from a load cell, so as to obtain time series signals; a plurality of frequency filters (121-123) for filtering the time series signals according to frequencies; and a transfer element (13) for transferring the signal filtered by at least one of the frequency filters (121-123) according to the frequency to a control device (90). The suppressed frequency bands of the frequency filters (121-123) are not repeated.

Claims

1. A signal processing device, adapted to filter signals coming from a load cell measuring a weight of at least one work and transfer the signals to a control device, the signal processing device comprising:

a data acquiring circuit, periodically acquiring the signals from the load cell, so as to obtain the signals of a time series as time series signals;

a plurality of frequency filters, filtering the time series signals acquired by the data acquiring circuit according to frequencies, wherein frequency bands suppressed by the frequency filters are not repeated, and each of the plurality of frequency filters is preset with an inherent vibration frequency of an inertial system including the at least one work being measured and a weighing platform where the at least one work is placed, wherein the plurality of frequency filters are switched by detecting a change of the at least one work being measured; and

a transfer circuit, transferring the signal filtered by at least one of the frequency filters according to the frequency to the control device.

2. The signal processing device as claimed in claim 1, further comprising:

a filter switching circuit, switching each of the frequency filters according to whether the plurality of frequency filters are adapted to the time series signals acquired by the data acquiring circuit.

3. The signal processing device as claimed in claim 2, wherein the filter switching circuit switches the frequency filters according to whether the frequency filters are adapted to the time series signals acquired by the data acquiring circuit during the process that the data acquiring circuit acquires the signals of the time series.

4. The signal processing device as claimed in claim 3, wherein the filter switching circuit receives a control command from the control device, and switches the frequency filters according to the control command.

5. The signal processing device as claimed in claim 3, wherein the filter switching circuit switches the frequency filters according to a flag configured to each of the frequency filters,

wherein the flags are rewritten by the control device.

6. The signal processing device as claimed in claim 1, wherein the frequency filters comprise low pass filters and notch filters.

7. A non-transitory recording medium, recording control procedure, adapted to be accessed by and loaded to a computer serving as the signal processing device as claimed in claim 1, wherein the control procedure is loaded to the computer to implement functions of the data acquiring circuit, the frequency filters and the transfer circuit.

8. A control method of a signal processing device, adapted to filter signals coming from a load cell measuring a weight of at least one work and transfer the signals to a control device, the control method of the signal processing device comprising:

a data acquiring step, periodically acquiring the signals from the load cell, so as to obtain the signals of a time series as time series signals;

a filtering step, filtering the time series signals acquired in the data acquiring step according to frequencies, wherein at least one of a plurality of frequency filters with suppressed frequency bands being not repeated is used to perform the filtering step, each of the plurality of frequency filters is preset with an inherent vibration frequency of an inertial system including the at least one work being measured and a weighing platform where the at least one work is placed, and the plurality of frequency filters are switched by detecting a change of the setup of the at least one work being measured; and

a transfer step, transferring the signal obtained by performing filtering according to the frequency in the filtering step to the control device.

9. A signal processing device, adapted to filter signals coming from a load cell measuring a weight of at least one work and transfer the signals to a control device, the signal processing device comprising:

a processor, configured to periodically acquire the signals from the load cell, so as to obtain the signals of a time series as time series signals; and

a plurality of frequency filters, filtering the time series signals acquired by the processor according to frequencies, wherein frequency bands suppressed by the frequency filters are not repeated, and each of the plurality of frequency filters is preset with an inherent vibration frequency of an inertial system including the at least one work being measured and a weighing platform where the at least one work is placed, and the plurality of frequency filters are switched by detecting a change of the at least one work being measured,

wherein the processor is further configured to transfer the signal filtered by at least one of the frequency filters according to the frequency to the control device.

10. The signal processing device as claimed in claim 9, wherein the processor is further configured to switch each of the frequency filters according to whether the plurality of frequency filters is adapted to the time series signals.

11. The signal processing device as claimed in claim 10, wherein the processor switches the frequency filters according to whether the frequency filters are adapted to the time series signals during the process that the processor acquires the signals of the time series.

12. The signal processing device as claimed in claim 11, wherein the processor receives a control command from the control device, and switches the frequency filters according to the control command.

13. The signal processing device as claimed in claim 11, wherein the processor switches the frequency filters according to a flag configured to each of the frequency filters, wherein the flags are rewritten by the control device.

14. A non-transitory recording medium, recording control procedure, adapted to be accessed by and loaded to a computer serving as the signal processing device as claimed in claim 9, wherein the control procedure is loaded to the computer to implement functions of the processor and the frequency filters.