Abu Dzarr

11 Questions 31 Answers 0 Followers

Questions related from Abu Dzarr

Does the human body inherently vibrate at 50Hz?

I was working with a new (old model) accelerometer without signal conditioning or amplification and I am picking up a ~50Hz sine wave acceleration (on FFT) when holding it in my hand. The signal...

25 June 2015 1,918 8 View

Where can I get the reference to cite for %Contribution in Gage R&R analysis?

I wanted to cite the reference for the %contribution. GRR=GRR9. AIAG only provided the guidelines on %StudVar and ndc. Who first recommended the limits for...

07 April 2015 2,198 2 View

How do I determine the confidence interval (CI) of a percentage considering that both enumerator and denominator have CI?

I have performed a gage analysis using standard sample size of 30 parts, 3 operators and 3 repeats. The result from Minitab is attached. The 95% CI was calculated separately using modified...

09 March 2015 375 3 View

How can I determine the minimum detectable acceleration for Knowles BU7135 accelerometer?

Knowles BU7135 is extensively used in surface acceleration (SAL) measurement in speech related study. By the way, the acceleration data is in the range of milli-gravity (mg). Piezoelectric...

21 February 2015 4,514 3 View

Can anyone help with a slow growth rate of NCI-H929 on RPMI 1640+10%FBS+BME?

The reference cell line (as above) from ATCC turned turbid on D3 upon thawing. I managed to salvage the cells with 2500U/mL of Penicillin/streptomycin. The bacterial culture from supernatant...

27 November 2013 713 3 View

What is the logic of resetting passage number to zero when cell culture is cryopreserved and not continue counting from its previous passage number?

ATCC recommends limiting up to passage 5 (cancer cell lines) for cell culture studies in order to avoid significant genetic drift from reference cell line. Every time a cell culture is...

24 September 2013 5,588 2 View

Microphones for voice recording/analysis

18 months ago, I purchased Apex440 a Class-A FET cardioids condenser microphone with USB output directly connecting to a computer from frontendstudio for voice analysis study. It appeared to me...

14 July 2013 2,030 0 View

Formant frequencies and continuous speech?

Is anyone aware of any work being done looking at whether the formant frequencies of a target vowel varies or remained stable during continuous speech. I tried to search but failed to come...

16 May 2013 2,209 12 View

Is there an objective way of determining a single formant value when PRAAT incorrectly gives two very closely related values.

When working with /i/ vowel in PRAAT as seen in the attachment, PRAAT gives F1 and F2 values which are very close within around 270/365Hz. This persist despite twiddling on the number of formant...

03 January 2013 2,470 4 View

What is the difference between FFT (harmonics) and LPC (formants)?

I’m currently doing research investigating endogenously generated whole body vibrations. Firstly, I would like to prove that vibration can be detected on the skeletal system (using accelerometer)...

20 September 2012 7,336 8 View

Why is formant frequency different from the harmonic frequency?

I have come to understand that both FFT (not specific to voice only) and LPC are meant to break down voice signals into its wave components. The FFT algorithm (representing DFT) deconvolutes...

17 September 2012 3,189 13 View