An Approach of Realizing a Linear-Phase Filter with a Multiple-Notched Property

Nakamura, Shōgo; Ishihara, Tatsuo; Kotani, Masahiro

doi:10.1109/tim.1983.4315115

Cited by 10 publications

(4 citation statements)

References 5 publications

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“…In addition to it, this method causes the output data rate to decrease. A digital filter which has narrow bandwidth notch frequencies is presented in [4]. However, this digital filter needs many logic gates for rejecting 50 Hz and 60 Hz elements and measuring DC signal.…”

Section: Digital Filter Transfer Functionmentioning

confidence: 99%

Area-Efficient Decimation Filter with 50/60Hz Power-Line Noise Suppression for ΔΣ A/D Converters

Kuribayashi

Kajita

2017

SICE Journal of Control, Measurement, and System Integration

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: This paper introduces a new digital filter utilizing a SINC filter used in ΔΣ A/D converters and featuring 50/60 Hz power-line noise rejection. Compared with a simple series connection of the SINC filter and a noise suppression filter for the power-line, this digital filter reduces the number of gates by approximately 40% and enables the attenuation of 50 Hz and 60 Hz elements by approximately 55 dB.

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Section: Digital Filter Transfer Functionmentioning

confidence: 99%

Area-Efficient Decimation Filter with 50/60Hz Power-Line Noise Suppression for ΔΣ A/D Converters

Kuribayashi

Kajita

2017

SICE Journal of Control, Measurement, and System Integration

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“…As shown in Fig. 10, because the difference filter, which is divided from a 10 m versine characteristic, exhibits a high-pass characteristic and the DC (0 Hz) gain is zero, allowing this filter to utilize integration stabilization (7) . Since the difference filter operates by taking the difference between the input signal and its delayed signal, the processing load is very light.…”

Section: Frequency Variable Difference Filtermentioning

confidence: 99%

Inertial Measurement Processing Techniques for Track Condition Monitoring on Shinkansen Commercial Trains

Naganuma

Kobayashi

Okumura

2010

JMTL

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We have developed three inertial measurement processing techniques to measure the longitudinal level of tracks using the devices mounted on the commercial shinkansen trains. Two of them, labeled as the "Frequency variable difference filter" and the "Speed variable moving summation", employ digital processing, while the other employs analogue processing applying a frequency variable low-pass filter. Through a series of the simulation tests, the above all methods were found to be capable of deriving a 10 m versine longitudinal level directly from the measured acceleration with high precision without causing any waveform distortion. An experimental prototype of a digital inertial device applying the "Frequency variable difference filter" that can help to minimize the processing load was produced, and its reliability was investigated. As a result, the output by means of the proposed prototype revealed good correlation with the data collected from an existing track geometry car. After the successful test results were obtained, the devices have so far been manufactured and installed in six N700 commercial trains. The repeatability was also found to be excellent, thus the device is expected to detect even a slight change of the track.

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“…As shown in Fig. 8, because the difference filter has a high-pass characteristic in the divided 10 m versine method, and the DC gain is zero (f = 0 Hz), this filter can utilize integration stabilization [4]. Since the difference filter operates by taking the difference between the input signal and its delayed signal, the processing load is very light.…”

Section: Algorithm Using Frequency Variable Difference Filtermentioning

confidence: 99%

Digital inertial algorithm for recording track geometry on commercial shinkansen trains

Kobayashi

Naganuma

Nakagawa

et al. 2008

WIT Transactions on the Built Environment

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The inertial method is based on a simple law that states that the double integration of acceleration gives its displacement, and is one of the general methods used for recording track geometry. In the inertial method, a high-pass filter (HPF) is essential to ensure stable calculation of the double integration of acceleration. The previous analog inertial measuring system remained wave distortion because the system used analog HPFs, which had a non-linear phase property. To avoid wave distortion caused by analog HPFs, a new algorithm was developed for digital inertial measurement that utilizes the measurement property of the 10 m versine. A new track geometry recording device using this algorithm was produced, capable of being installed on commercial shinkansen trains. This device, called RAIDARSS 3, measures 10 m versine track irregularities from double integration of the axle box acceleration in real time. If the measured track irregularities exceed the predetermined target maintenance values, the measured values and locations of the irregularities are automatically reported to the train control center and track maintenance depots, and slow speed operation is directed, if necessary. To confirm the measurement precision of this device, an experimental prototype was tested on a shinkansen test train. Results showed that the output of the prototype achieved good correlation with data from the existing track geometry car. The new RAIDARSS 3 track condition monitoring device will be installed on six N700 train sets during fiscal year 2008.

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An Approach of Realizing a Linear-Phase Filter with a Multiple-Notched Property

Cited by 10 publications

References 5 publications

Area-Efficient Decimation Filter with 50/60Hz Power-Line Noise Suppression for ΔΣ A/D Converters

Area-Efficient Decimation Filter with 50/60Hz Power-Line Noise Suppression for ΔΣ A/D Converters

Inertial Measurement Processing Techniques for Track Condition Monitoring on Shinkansen Commercial Trains

Digital inertial algorithm for recording track geometry on commercial shinkansen trains

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An Approach of Realizing a Linear-Phase Filter with a Multiple-Notched Property

Cited by 10 publications

References 5 publications

Area-Efficient Decimation Filter with 50/60Hz Power-Line Noise Suppression for &Delta;&Sigma; A/D Converters

Area-Efficient Decimation Filter with 50/60Hz Power-Line Noise Suppression for &Delta;&Sigma; A/D Converters

Inertial Measurement Processing Techniques for Track Condition Monitoring on Shinkansen Commercial Trains

Digital inertial algorithm for recording track geometry on commercial shinkansen trains

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Product

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About

Area-Efficient Decimation Filter with 50/60Hz Power-Line Noise Suppression for ΔΣ A/D Converters

Area-Efficient Decimation Filter with 50/60Hz Power-Line Noise Suppression for ΔΣ A/D Converters