digital filter
A digital filter and data technology, applied in the field of digital filters, can solve problems such as the burden on users of additional detection circuits, and achieve the effect of reducing circuit scale
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[0033] [First Embodiment]
[0034] Hereinafter, embodiments of the present invention will be described with reference to the drawings. image 3 It is a block diagram showing the configuration of the digital filter of the first embodiment of the present invention. The digital filter of this embodiment includes: a multi-stage cascaded accumulation calculation unit 10, which is based on the same sampling frequency f as the sampling frequency of the data input to the digital filter. S The clock operates to accumulate input data every 1 sample; the multi-stage cascade configuration or the 1-stage difference calculation unit 11, which is based on the sampling frequency f D = F S The clock of / N operates to subtract the data one sample before from the input data; the frequency conversion unit 12 is provided between the output of the final accumulation calculation unit 10 and the input of the primary difference calculation unit 11, Sampling frequency f D Thin out the sampling frequency f ...
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[0048] [Second embodiment]
[0049] Next, the second embodiment of the present invention will be described. In the digital filter of the first embodiment, the cumulative calculation unit 10, the frequency conversion unit 12, and the difference calculation unit 11 at the last stage are configured ( Figure 4A ) Can be converted to Figure 4B Looks like it can eventually be converted to Figure 4C Look like. By using this conversion principle, the digital filter of the first embodiment can be simplified to Figure 5 Look like.
[0050] In this embodiment, the cumulative calculation and frequency conversion unit 17 is used instead of image 3 The cumulative calculation unit 10, the frequency conversion unit 12, and the difference calculation unit 11 in the last stage in the. When the difference calculation unit 11 configured in a multi-stage cascade configuration is provided, the cumulative calculation and frequency conversion unit 17 may be provided instead of the final cumulative c...
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