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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 can use a switch to set the characteristics of the notch filter, but the disadvantage is that an additional detection circuit will be added or the user's burden

Method used

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no. 1 Embodiment

[0034] Embodiments of the present invention will be described below 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 the present embodiment includes: a multi-stage cascaded cumulative calculation unit 10, which is input at the same sampling frequency f as the sampling frequency of the data input to the digital filter. S The clock operates, and the input data is accumulated for each sample; the multi-stage cascade configuration or one-stage difference calculation part 11, which is based on the sampling frequency f D =f S The clock of / N operates, subtracting the data before 1 sample from the input data; the frequency conversion part 12 is arranged between the output of the accumulation calculation part 10 of the last stage and the input of the difference calculation part 11 of the primary stage, at sampling frequency f D Thinning out the sampl...

no. 2 Embodiment

[0049] Next, a second embodiment of the present invention will be described. In the digital filter of the first embodiment, the final-stage cumulative calculation unit 10, frequency conversion unit 12, and difference calculation unit 11 are configured ( Figure 4A ) can be converted to Figure 4B looks like , which can eventually be transformed into Figure 4C look. By using the principle of this conversion, the digital filter of the first embodiment can be simplified as Figure 5 look.

[0050] In this embodiment, the cumulative calculation and frequency conversion unit 17 is used instead of image 3 The accumulation calculation unit 10 , the frequency conversion unit 12 and the difference calculation unit 11 are the final stage. In the case of providing multi-stage cascade-structured difference calculation unit 11 , an accumulation calculation and frequency conversion unit 17 may be provided instead of the last-stage accumulation calculation unit 10 , frequency conversi...

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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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