Questions tagged [conversion]
The conversion tag has no usage guidance.
41
questions
0
votes
1answer
48 views
Convert measured spectrum to impulse response
I am still learning, so please bear with me:
My audio measurement tool exports the measured spectrum of the DUT in the following format:
Frequency [Hz]
Magnitude [dB]
Phase [degree]
It is stored in ...
0
votes
0answers
20 views
MPEG Audio Constant bit rate conversion
I am trying to convert few .wav files to .mp3 format
The desired .mp3 format is :
I tried with FFmpeg with this code :
...
0
votes
1answer
25 views
Is there two version of ulaw and alaw encoding in audio compression?
I am new to encoding in audios and i have searched for ulaw and alaw and found there is conversion from audio to this encoding CCITT alaw/ulaw and as i have known alaw/ulaw belongs to ITUT group not ...
0
votes
0answers
13 views
what is the DNL of flash converter
i have a flash ADC converter with 1V vref and idial ressistors but in the comparator i have standart deviation of 3mV.
how do i calculate from the the standart deviation of the whole device(DNL INL)?
...
0
votes
1answer
16 views
Implementing an L-System conversion from R2 to R1 for symmetric, square matrices
I have been reading for some time about L-Systems, and specifically the Hilbert Space filling curve. I am interested in writing a function to convert upper-triangular matrix coordinates into an ...
0
votes
0answers
28 views
Filtering via Convolution and Multiplication… Why different results? *Code and image*
Image and MATLAB code are below.
I am doing Complex Down Conversion (IQ Sampling) to 0 Hz and using a Low Pass Filter after it to remove an unwanted conversion product.
I start with 500-1000Hz ...
0
votes
1answer
50 views
Scientific names to piano key numbers
Is there a formula that converts scientific note names to piano key numbers? As an example, given A4 it would output 49.
1
vote
1answer
110 views
Usefulness of Matched $z$ transform Method
I'm aware that the matched $z$ transform method maps between the continuous $s$ plane and the discrete/digital $z$ plane but my question is - when would this be necessary? Why would we need to convert ...
1
vote
1answer
192 views
Why is the green colour not represented as black in Cr component of YCbCr?
I am testing conversion from RGB to YCbCr in Python's pillow imaging module (formerly PIL), and am getting predictable results ...
1
vote
2answers
570 views
Conversion from Floating point representation to Fixed point representation
I have written a matlab function for a constellation mapper and I want to create a Fixed-point version of that code for implementation on FPGA. I know matlab has a specific toolbox for fixed-point ...
0
votes
1answer
44 views
Conversion between DTFT in radians/sample to DTFT in cycles/sample
I have found that most commonly the DTFT is defined as:
$X(\omega) = \sum_{n=-\infty}^{\infty} x[n]e^{-j \omega n}$.
However the class I am taking frequently uses the DTFT expressed in "normalized ...
0
votes
1answer
35 views
Conversion of airflow signal into 1-D as a input for CNN [closed]
Trying to detect apnea from airflow signal. I have 100 files of the patient each file contains at least 8 hours of data and sampling rate is 32 Hz. How to prepare my dataset which is used as an input ...
0
votes
1answer
54 views
Fundemental scintific publication in up conversion down conversion
Prior to performing DSP on a signal and afterwards, up and down conversion of the same in order to transmit and receive the signal is important.
I would like to know if anyone knows a fundamental ...
1
vote
0answers
26 views
What is the relationship between luminosity of Lab color space and intensity of HSI color space?
I am wondering whether one can simply convert the intensity of a color in HSI space to the luminosity value in Lab space. I am referring to te CIELab color space as discussed here: https://en....
4
votes
3answers
409 views
Going from digital to analog filters
I've been learning about digital signal processing for some time, and I understand the principles in the digital world, as well as the conversion of continuous filters in the s-domain to digital ...
1
vote
0answers
105 views
Calculating gyroscope data from accelerometer and attitude data
I am currently collecting accelerometer and attitude data using smartphone sensors. Data is collected at 100Hz over 2.5 seconds. Of which there are 250 accelerometer points and 250 points representing ...
1
vote
1answer
48 views
Why 1.01 equals -0.75 in Q2
I'm trying to learn Q notation but I don't understand why 1.01 in the Q2 number format equals -0.75. How is that calculation done? I can understand that 1.1 equals -0.5 because the leading 1 means the ...
1
vote
2answers
2k views
Pa^2/Hz to dB/Hz conversion
I have PSD data from an computational aeroacoustics analysis, which is in the units of Pa^2/Hz. I want to convert this to dB/hz; would it be correct if I use PSD[in dB/Hz] = 10log10(PSD[in Pa^2/Hz]) ...
1
vote
1answer
18k views
dB/hz to dB Conversion
I'm have a PSD graph of dB/hz vs. frequency in hz. I want to convert the dB/hz unit to dB, but I can't find any way of doing it. Help would be much appreciated!
4
votes
1answer
2k views
How to choose the most appropriate color space for a computer vision application?
A lot of image processing techniques used in computer vision consist (among other things) in switching from RGB to another color space (HSV, YUV, LMS...) : color transfer, visual tracking... It seems ...
1
vote
1answer
152 views
Non-uniform acquisition to fixed sample rate
I'm facing a challenge that requires me to process a signal from an engine knocking sensor. The acquisition is done synchronously with the engine speed (every 0.1 degree) which gives me a range from ...
0
votes
1answer
2k views
Convert 16-bit wav file to 12-bit raw audio file
I want to convert a 16-bit wav file to 12 bit raw audio samples (to simulate the output of an ADC).
I'm trying to run
...
0
votes
1answer
4k views
conversion of 1d signal to 2d signal for CNN operation
I have a 1D signal data sampled at 25kHz and I want to modify in to 2D signal so as to modify it as the input to ConvolutionalNets as they work only on 2 dimensional data.
What are possible ways to ...
1
vote
1answer
211 views
Proper rounding when converting between digitized values and floating point
I have some very large files that are unsigned 8 bit (0 to 255), real valued. I need to do some simple tuning and decimation. In the past, when I've dealt with low bit rate samples, I've run into ...
1
vote
0answers
267 views
I have 24-bit data in two's complement 32-bit integers. I need Q31 data
I have been trying to learn about Q31 format (as well as Q15), but I am having trouble understanding how it works.
So my CODEC is giving me 24-bit two's complement data. I have converted this data ...
-1
votes
1answer
2k views
Converting from radians/samples to normalized frequency range $[0.0, 1.0]$?
I'm trying to understand the following code, specifically how to use the results of scipy.signal.freqz where w in ...
3
votes
2answers
4k views
Conversion into the Q31 Format
I have a Setup, where I receive 24-bit ADC samples in the two's complement in 8-bit chunks. Usually I just "converted" them into a signed 32-bit integer like this:
...
1
vote
3answers
230 views
Linearizing digital-analog converters
I'm looking at ways to improve the effective resolution of DACs. It seems that element mismatch (i.e. integral non-linearity) is the main contributor to distortion in modern DACs. Apart from ...
3
votes
2answers
2k views
Convert sine wave signal to square wave signal
I have a signal containing a variation of digital ASK type on-off keyed sine wave among which some stochastic irrelevant harmonic waves occur, like you can see on this figure:
In its current form ...
1
vote
1answer
117 views
Is possible to perform algebric operation with bitwise operations in PDM domain?
I have to compute the some operations (say sum and subtraction) between 2 signals.
I have data in PDM domain:
x1_pdm(t)=[0101011....];
and
x2_pdm(t)=[0101011....];
What I do now is:
convert x1_pdm and ...
1
vote
1answer
51 views
Difference between delayed down-converted signal and a down-converted delayed signal
I am having trouble understand what I think should be a pretty simple concept. Conceptually I can understand that a signal that has been down-converted, and then delayed in time is different than a ...
1
vote
2answers
490 views
Grayscale conversion before applying sobel gradient operator
I am currently replacing a hand-made image processing library by OpenCV. The programmer who worked on this library had implemented the sobel gradient function. This implementation is right except that ...
2
votes
1answer
2k views
inverse Fixed point number (number^-1) [closed]
Could someone please provide a method for inverting random fixed point numbers.
I have as an input both positive and negative floating point numbers that should be converted into fixed point and then ...
4
votes
3answers
223 views
Low analog lowpass + ADC vs High analog lowpass + ADC + low digital lowpass
I'm doing EEG data collection and my amp forces use of an analog lowpass filter before the ADC. I'm fairly sure that I won't be interested in phenomena associated with frequencies of 30Hz or higher, ...
1
vote
1answer
570 views
DAC and sample and hold effect
I am having some trouble understanding how a digital signal gets converted back to an analog signal.
Why is the "sample and hold" effect a problem?
0
votes
1answer
752 views
Frequency domain to time domain conversion-(varying sample count)
I need to convert 150 Frequency domain samples to the time domain. The problem is, I have been provided with 250 time domain samples for comparing my results. How am I supposed to relate the 150 ...
2
votes
1answer
134 views
Revert anayltic signal(length(N/2)) to real signal (length(N))
As a beginner in signal processing, i'll try to explain my problem most thoroughly.
I'll firstly explain the idea of the transformation the real valued data has undergone.
This includes the ideas and ...
2
votes
2answers
1k views
12 bit ADC to 8 bit DAC
A bit of background information:
I plan to start experimenting with digital signal processing on microcontrollers. The particular microcontroller I plan to use (TI Stellaris LM4F230H5QR, from the ...
4
votes
1answer
75 views
Is gamma correction applied in my setup
I am working on a scientific application where I would like to evaluate luminance in an image, however I am unsure if what I receive from my setup is luminance (Y) or luma (Y'). I use a camera with a ...
1
vote
1answer
529 views
Is the mean of visible color in CIELab color space can be non visible color?
I am converting color from RGB to CIELab to train a GMM. When I get back the mean of clusters of the GMM I have sometimes negatives values in RGB space. I was wondering if the mean of only visible ...
3
votes
4answers
6k views
How to Generate False Color Palette
How to convert grayscale intensity input to something like the following image?
It seems that no response (0, black) is converted to dark blue, then it goes through other colors to red.
How are ...
