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xioTechnologies / Gait-Tracking-With-x-IMU

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LP filter accelerometer data help #27

Open arcgislearner opened 5 years ago

arcgislearner commented 5 years ago

Hello, I want to know how to determine the value of the filtCutOff in Script.m：

filtCutOff =5; [b, a] = butter(1, (2*filtCutOff)/(1/samplePeriod), 'low'); acc_magFilt = filtfilt(b, a, acc_magFilt);

MTfirst commented 4 years ago

In my experience, about 1 Hz to 6 Hz is brought by subjects. In other words, f < about 1 or f > about 6 is noise (for example: offset of IMU) so we can cut.

Though filtCutOff=5 is valid of most subjects, if you want define manually, Upper Band should determined according to walking speed.

Thanks.

arcgislearner commented 4 years ago

OK,thanks for your reply, i will try it again.

------------------ 原始邮件 ------------------ 发件人: "MTfirst"<notifications@github.com>; 发送时间: 2019年12月10日(星期二) 凌晨4:39 收件人: "xioTechnologies/Gait-Tracking-With-x-IMU"<Gait-Tracking-With-x-IMU@noreply.github.com>; 抄送: "philrain"<cjh19970707@qq.com>;"Author"<author@noreply.github.com>; 主题: Re: [xioTechnologies/Gait-Tracking-With-x-IMU] LP filter accelerometer data help (#27)

In my experience, about 1 Hz to 6 Hz is brought by subjects. In other words, f < about 1 or f > about 6 is noise (for example: offset of IMU) so we can cut.

Though filtCutOff=5 is valid of most subjects, if you want define manually, Upper Band should determined according to walking speed.

Thanks.

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Abdul-Sajeed commented 4 years ago

Hello, what if i am using vehicle with speed of 20 - 30 km/hr. Is it possible to reset cutoff speed ? (thanks)

arcgislearner commented 4 years ago

Sorry, I didn't do this in the car, I just tied it to my feet.

------------------ 原始邮件 ------------------ 发件人: "xioTechnologies/Gait-Tracking-With-x-IMU" <notifications@github.com>; 发送时间: 2020年10月10日(星期六) 凌晨1:36 收件人: "xioTechnologies/Gait-Tracking-With-x-IMU"<Gait-Tracking-With-x-IMU@noreply.github.com>; 抄送: "Philrain"<cjh19970707@qq.com>;"Author"<author@noreply.github.com>; 主题: Re: [xioTechnologies/Gait-Tracking-With-x-IMU] LP filter accelerometer data help (#27)

Hello, what if i am using vehicle with speed of 20 - 30 km/hr. Is it possible to reset cutoff speed ? (thanks)

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