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

Active Publication Date: 2019-05-31
YAMATAKE HONEYWELL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is also possible to automatically determine whether the commercial frequency is 50Hz or 60Hz and select the characteristics of the notch filter, or the user

Method used

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Example

[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 ...

Example

[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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Abstract

The digital filter of the present invention includes: an accumulation calculation part (10), which is set at the same sampling frequency f as the sampling frequency of the input data S The clock of the operation, accumulates input data every 1 sample; D =f S /N Thin out the sampling frequency f S The data; difference calculation part (11), it presses sampling frequency f D The clock of 50Hz subtracts the data before subtracting 1 sample from the input data; D The clock of the operation, subtracts the data before a plurality of samples from the input data; And 60Hz removes difference calculation part (30), it presses sampling frequency f D The clock of the clock operates to subtract the data of the previous number of samples from the input data.

Description

technical field [0001] The invention relates to a digital filter, in particular to a digital filter combined with a SINC filter and a notch filter. Background technique [0002] A SINC filter is widely known as a decimation filter used in a ΔΣ AD converter. The SINC filter can be (1-z -N ) / (1-z -1 ) to express this transfer function. We know that by increasing the order of the ΔΣ modulator used in the ΔΣAD converter, the effect of noise shaping can be improved, but the order of the subsequent decimation filter (SINC filter) must be higher than that of the ΔΣ modulator. [0003] For example, consider here an AD converter using a secondary ΔΣ modulator. As a SINC filter, such as Figure 7 As shown, three filters are required. If the SINC filter is expressed by the transfer function, it is {(1-z -N ) / (1-z -1 )}^3. Here, we also know the case where the accumulation calculation part constituting the denominator part of the transfer function is separated from the differenc...

Claims

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Application Information

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IPC IPC(8): H03H17/00H03M3/02
CPCH03M3/02H03H17/0286H03H17/0671H03M3/462H03H17/025H03H17/0282
Inventor 梶田徹矢
Owner YAMATAKE HONEYWELL CO LTD
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