Device and method for filtering weight indicative signal from weighing device
First Claim
1. A device for filtering a weight signal of a weighing device, the weight signal having undesirable components in a frequency range including oscillatory components determined by the weighing range of said weighing device and/or strong resonance components caused by said weighing device, said filtering device comprising means for sampling said weight signal to provide a series of sample signals, and arithmetic means for arithmetically processing said sample signals according to a transfer characteristic, characterized in that the transfer characteristic of said arithmetic means corresponds to a transfer function of multiplex progressive averages of said sample singals, and said arithmetic means includes means for selecting the averaging numbers of the respective orders of the progressive averages to provide a plurality of notch frequencies within and/or near said frequency range.
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Abstract
A digital filter or an equivalent device for filtering a weight signal provided by a weighing device to remove undesirable oscillatory components caused by mechanical vibration of the weighing device, which is constructed to have a plurality of notch frequencies in its transfer characteristic within and/or near the frequency range including such undesirable oscillatory components by utilizing the principle of transfer function of multiplex progressive averages of a series of sample values extracted from the weight signal.
46 Citations
15 Claims
- 1. A device for filtering a weight signal of a weighing device, the weight signal having undesirable components in a frequency range including oscillatory components determined by the weighing range of said weighing device and/or strong resonance components caused by said weighing device, said filtering device comprising means for sampling said weight signal to provide a series of sample signals, and arithmetic means for arithmetically processing said sample signals according to a transfer characteristic, characterized in that the transfer characteristic of said arithmetic means corresponds to a transfer function of multiplex progressive averages of said sample singals, and said arithmetic means includes means for selecting the averaging numbers of the respective orders of the progressive averages to provide a plurality of notch frequencies within and/or near said frequency range.
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6. A method of filtering a weight signal of a weighing device, the weight signal having undesirable components in a frequency range including oscillatory components determined by the weighing range of said weighing device and/or strong resonance components caused by said weighing device, the method of filtering comprising the steps of sampling said weight signal to provide a series of sample signals, and arithmetically processing said sample signals to provide a filtered output, characterized in that said arithmetic processing step includes a step of calculating multiplex progressive averages of said sample signals, said calculating step including the step of selecting the averaging number of each order of said multiplex progressive averages so that a plurality of notch frequencies appear within and/or near said frequency range.
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7. A method of filtering a weight signal of a weighing device, the weight signal having undesirable components in a frequency range including oscillatory components determined by the weighing range of said weighing device and/or strong resonance components caused by said weighing device, the method of filtering comprising the steps of sampling said weight signal to provide a series of sample signals, and arithmetically processing said sample signals to provide a filtered output, characterized in that said arithmetic processing step includes an operation corresponding to a multiplex progressive averaging operation of said sample signals in which an averaging number of each order is selected so that a plurality of notch frequencies appear within and/or near said frequency range.
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8. A device for filtering an analog weight signal from a weighing apparatus, the weight signal having undesirable components in a frequency range, the device comprising:
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means for sampling the weight signal; means for converting the sampled weight signal to a digital signal; and means for producing multiplex progressive averages of the digital signal having averaging numbers of the respective orders of the progressive averages to provide notch frequencies within and/or near said frequency range thereby to generate a digitally filtered signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of filtering an analog weight signal from a weighing apparatus, the weight signal having undesirable components in a frequency range, said method comprising the steps of:
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sampling the weight signal; converting the sampled weight signal to a digital signal; and producing multiplex progressive averages of the digital signal, the multiplex progressive averages having averaging numbers of the respective orders of the progressive averages to provide notch frequencies within and/or near the frequency range thereby to generate a digitally filtered signal.
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Specification