Furthermore, I am still not sure how to check if it meets the nyquist criteria, which if I have understood correctly, the nyquist frequency must be twice the sample rate. The first and the second subplots show the template signals from the database. In frequencies where spectral coherence is high, the relative phase between the correlated components can be estimated with the cross-spectrum phase. Rename .gz files according to names in separate txt-file. Set the pass band frequency to 4.9 GHz and the stop band frequency to 5.6 GHz. https://de.mathworks.com/matlabcentral/answers/147437-time-aligning-two-signal-at-different-sample-rates, https://de.mathworks.com/matlabcentral/answers/147437-time-aligning-two-signal-at-different-sample-rates#comment_231234, https://de.mathworks.com/matlabcentral/answers/147437-time-aligning-two-signal-at-different-sample-rates#answer_148482. MathWorks is the leading developer of mathematical computing software for engineers and scientists. Based on your location, we recommend that you select: . Launching the CI/CD and R Collectives and community editing features for Confusion in figuring out the relation between actual frequency values and FFT plot indexes in MATLAB, Cross-Correlation and Interpolation to choose the most similar signal. 2- you can use 1-D data interpolation . This is also known as a sliding dot product or sliding inner-product and is closely related to convolution. "Cross-Correlation Between Template 1 and Signal", "Cross-Correlation Between Template 2 and Signal", % Sample rate is 1 sample every 30 minutes, Compare Signals with Different Sample Rates, Measure Delay Between Signals and Align Them. The mscohere function calculates the spectral coherence between the two signals. This makes sense given that the data comes from a temperature-controlled building on a 7-day calendar. Connect and share knowledge within a single location that is structured and easy to search. 1) resample the data with the fixed sampling rate (FSR), so that its samples are 10 ms appart from each other. Introduction to Sampling Sampled Signals in MATLAB I Note that we have worked with sampled signals whenever we have used MATLAB. Normalize them so their maximum value is 1. What do you think you want to resample to? The phase lag between the 35 Hz components is close to -90 degrees, and the phase lag between the 165 Hz components is close to -60 degrees. what about upsampling the other? Find the treasures in MATLAB Central and discover how the community can help you! Different Learning Rate(LR) for Backbone and Heads n MMSegmentation, you may add following lines to config to make the LR of heads 10 times of backbone. $\endgroup$ - Around what, specifically? 11 1 The simplest would be to resample by interpolation either the signal or the filter so their spacing match. The vibrations it produces are measured by three identical sensors located at different spots. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. 2.2 Spectral Lines (SL) - After Fourier transform, total number of frequency domain samples. The best answers are voted up and rise to the top, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. Asking for help, clarification, or responding to other answers. Most of the techniques I have discovered to time align two signals requires them to be sampled at the same rate. You have a modified version of this example. Many measurements involve data collected asynchronously by multiple sensors. Part one changes the sample rate of a sinusoidal input from 44.1 kHz to 48 kHz. The time interval between samples is called the sampling interval . How do I compare the frequency content of two signals? It will help you answer questions such as: How do I compare signals with different lengths or different sample rates? Thank you. For example, consider a car crossing a bridge. Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Around what, specifically? You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. The signal on one channel shall be inverted (i.e. Observe dominant and minor fluctuations in the auto-covariance. If you have two signals of two Y columns with Sampling Interval, first add a new column at the right, set as X, right click on the column, select Set Column Values from the short-cut menu, and type xof(A) in the opened dialog to make a copy of Y1 (column A)'s X. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. The sampling rate is the number of samples per second. To verify if they are, compute and plot the difference between the locations of subsequent peaks. I am trying to align both signals through cross-correlation methods. Speech enhancement can reduce this additive noise. How did Dominion legally obtain text messages from Fox News hosts? Yoshida, Y. Jordan's line about intimate parties in The Great Gatsby? Thus s2 leads s3 by 500 samples. How did StorageTek STC 4305 use backing HDDs? Consider a database of audio signals and a pattern matching application where you need to identify a song as it is playing. Web browsers do not support MATLAB commands. I am still new to signal processing, so in terms of upsampling or downsampling, I use only the, By the way when doing downsampling you should first filter your data with a brickwall at your future sampling frequency, to avoid aliasing, Synchronizing signals with different sample rates, The open-source game engine youve been waiting for: Godot (Ep. You have a modified version of this example. Double-click the upper Signal From Workspace block. sites are not optimized for visits from your location. Use xcorr for that purpose. The signal has two peaks roughly in the middle and after performing the upsample, those two peaks disappeared, thus synchronization using cross-correlation is not possible. Measurements were taken every 30 minutes for about 16.5 weeks. Dr. Saqib A. Saki is a mining and civil engineer, currently working in construction industry. Bran on 13 Aug 2014. To learn more, see our tips on writing great answers. The exoprosthesis movements can be calibrated by analyzing virtual movements for better mechanical alignment and maximum function for each . The first class is synchronous and the second one is asynchronous. . He previously worked as mining engineer in cement industry, planning engineer in open pit copper mine, research engineer in mineral processing, rock mechanics and ventilation labs. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. We did not consider a variability in sampling rates, which may be relevant in future testing, as Li's 2010 article would . To verify if they are, compute and plot the difference between the locations of subsequent peaks. I upsampled the second signal to 1500 Hz and the signal got "broken", so to say. Diastereomeric salt crystallization is a classical, widely applicable chiral resolution technique, which enables the separation of the enantiomers of both racemate and conglomerate-forming compounds. I am aware of the resample() function on matlab but I have a signal sampled at 60 Hz and the other at 200 Hz and I must of course use a rational fraction. Reload the page to see its updated state. offers. These physiological systems have been hypothesised to reflect low frequency power (LF) and high frequency power (HF) of the heart rate variability (HRV) signal; derived from electrocardiogram. How do I measure a delay between two signals (and how do I align them)? Please, see an example with signals A and B: whz dont you try to interpolate them on the same time axis with the max sampling frquency of the both ? https://la.mathworks.com/matlabcentral/answers/147437-time-aligning-two-signal-at-different-sample-rates, https://la.mathworks.com/matlabcentral/answers/147437-time-aligning-two-signal-at-different-sample-rates#comment_231234, https://la.mathworks.com/matlabcentral/answers/147437-time-aligning-two-signal-at-different-sample-rates#answer_148482. 1. Choose a web site to get translated content where available and see local events and Plotting Signals in Matlab One of the most powerful tools available in matlab is the plot function, which helps engineers visualise and analyse signals and system behaviour. The basic idea is that the observed signals may be "warped" (e.g. Sie haben eine genderte Version dieses Beispiels. The safest way to do this is to resample the signal with a lower sample rate. Different lengths prevent you from calculating the difference between two signals but this can easily be remedied by extracting the common part of signals. It is suitable in many applications but if irrational conversion factors are needed the problem appears. This makes sense given that the data comes from a temperature-controlled building on a 7-day calendar. that sounds like you didn't properly interpolate :), @MarcusMller the odds are high that I did not interpolate correctly. Consider a database of audio signals and a pattern matching application where you need to identify a song as it is playing. Furthermore, it is not always necessary to equalize lengths. The number of distinct words in a sentence. Asking for help, clarification, or responding to other answers. The phase lag between the 35 Hz components is close to -90 degrees, and the phase lag between the 165 Hz components is close to -60 degrees. The Cross-Rate Sum Example model opens. How do I measure a delay between two signals (and how do I align them)? I For example, we use the following MATLAB fragment to generate a sinusoidal signal: fs = 100; tt = 0:1/fs:3; xx = 5*cos(2*pi*2*tt + pi/4); I The resulting signal xx is a discrete-time signal: I The vector xx contains the samples, and I the vector tt species the . Limit the maximum lag to 50% of the signal to get a good estimate of the cross-covariance. MathWorks ist der fhrende Entwickler von Software fr mathematische Berechnungen fr Ingenieure und Wissenschaftler. Is there a way to avoid downsampling the first signal, because from what I know, when I downsample a signal, I lose information and I would like to avoid that. 2.3 Frequency Resolution (f) - Spacing between samples in the frequency domain. Web browsers do not support MATLAB commands. The safest way to do this is to resample the signal with a lower sampling rate. MathWorks ist der fhrende Entwickler von Software fr mathematische Berechnungen fr Ingenieure und Wissenschaftler. You see that s2 leads s1 by 350 samples, s3 lags s1 by 150 samples, and s2 leads s3 by 500 samples. It confirms that sig1 and sig2 have two correlated components around 35 Hz and 165 Hz. rev2023.3.1.43269. Many measurements involve data collected asynchronously by multiple sensors. Do you want to open this example with your edits? Sampling a signal To sample a signal in. load mtlb Loading the file mtlb.mat brings the speech signal, mtlb, and the sample rate, Fs, into the MATLAB workspace. Other MathWorks country With the temperatures in the low 70s, you need to remove the mean to analyze small fluctuations in the signal. it will be much easier, But length(A) and length(B) are different. To determine these factors, use rat. 38 MATLAB Beginners Tutorial- Align Sensors Data using alignsignals for Signal Processing - YouTube 0:00 / 9:47 38 MATLAB Beginners Tutorial- Align Sensors Data using alignsignals for. The resample function applies an anti-aliasing (low-pass) FIR filter to the signal during the resampling process. It will help you answer questions such as: How do I compare signals with different lengths or different sample rates? Choose a web site to get translated content where available and see local events and In Proceedings of the 2017 IEEE International Conference on Consumer Electronics-Taiwan (ICCE . Making statements based on opinion; back them up with references or personal experience. Reload the page to see its updated state. Going back to the previous example of 'gong' audio vector loaded in the Matlab variable space, the downsampling operation can be coded as follows. You clicked a link that corresponds to this MATLAB command: Run the command by entering it in the MATLAB Command Window. Other MathWorks country You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. When you analyze the signals, you may need to align them. How can I make this regulator output 2.8 V or 1.5 V? How do I compare the frequency content of two signals? The problem is that my two signals are with different sample rates. The signals have different arrival times. Connect and share knowledge within a single location that is structured and easy to search. Like small "local" integrals of some kind. The minor peaks indicate 7 cycles/week and the dominant peaks indicate 1 cycle/week. Web browsers do not support MATLAB commands. LR LR'head' 10. Load the signals into the MATLAB workspace and plot them. How to react to a students panic attack in an oral exam? Unable to complete the action because of changes made to the page. - mathreadler Jun 9, 2015 at 15:43 Based on your location, we recommend that you select: . 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. The extent of this saccadic modulation outside of the visual . . Synchronizing 2 time series signals at slightly different sampling frequencies. Choose a web site to get translated content where available and see local events and offers. Cross-correlation can be performed between signals with different lengths, but it is essential to ensure that they have identical sample rates. We can also use the finddelay function to find the delay between two signals. offers. with proper interpolation. Sampling Rate To discretize the signals, the gap between the samples should be fixed. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. Other MathWorks country sites are not optimized for visits from your location. How to get the closed form solution from DSolve[]? Resample the speech sample at the new sample rate. Jordan's line about intimate parties in The Great Gatsby? The first subplot indicates that signal S and template T1 are less correlated, while the high peak in the second subplot indicates that the signal is present in the second template. Load the speech sample. t21 indicates that s2 lags s1 by 350 samples, and t31 indicates that s3 leads s1 by 150 samples. Reload the page to see its updated state. Use alignsignals to align the signals. In frequencies where spectral coherence is high, the relative phase between the correlated components can be estimated with the cross-spectrum phase. Choose a web site to get translated content where available and see local events and Similarities can also be found in different sections of a signal to determine if a signal is periodic. Determine a rational approximation to the ratio of the new sample rate, 8192, to the original sample rate. Choose a web site to get translated content where available and see local events and offers. Unable to complete the action because of changes made to the page. In other words, template T2 leads signal S by 499 samples as indicated by SampleDiff. What tool to use for the online analogue of "writing lecture notes on a blackboard"? The ALMA software is a large collection of modules, which implements the functionality needed for the observatory day-to-day operations, including among others Array/Antenna Control, Correlator,. To learn more, see our tips on writing great answers. Recording an analog signal at evenly spaced instants in time creates samples. Allow for 1 dB of attenuation in the pass band and require at least 20 dB of attenuation in the stop band. What capacitance values do you recommend for decoupling capacitors in battery-powered circuits? Loading the file mtlb.mat brings the speech signal, mtlb, and the sample rate, Fs, into the MATLAB workspace. How can the mass of an unstable composite particle become complex? Figure 4 Fig. Why did the Soviets not shoot down US spy satellites during the Cold War? This workflow is common in audio processing. Is there a way around this? Line up the signals by leaving the earlier signal untouched and clipping the delays out of the other vectors. The 1-day cycle behavior indicates that there is also daily cyclic behavior where temperatures lower during the night and increase during the day. There are two classes of sample-rate converters. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Is email scraping still a thing for spammers. This information can now be used to align the 3 signals by time shifting the signals. Alignment is achieved by locating the peak of the interpolated waveform, which can be found by solving a quadratic . There are different sources of additive noise. Making statements based on opinion; back them up with references or personal experience. I am aware of the resample() function on matlab but I have a signal sampled at 60 Hz and the other at 200 Hz and I must of course use a rational fraction. A series of . In each plot display the location of the maximum. Then follow these steps: Click Waveform Editor > Edit > Convert Sample Type - or simply double-click the Sample Type section of the status bar. Other MathWorks country sites are not optimized for visits from your location. Web browsers do not support MATLAB commands. The safest way to do this is to resample the signal with a lower sample rate. I did a fft on my signal and if I am not wrong the frequency is roughly 750 Hz, so downsampling the first signal is not my best option. The first signal is sampled at 1500 Hz and the second one at 800 Hz. The first 7-day cycle indicates that there is weekly cyclic behavior of the building temperature where temperatures lower during the weekends and go back to normal during the week days. With the temperatures in the low 70s, you need to remove the mean to analyze small fluctuations in the signal. time aligning two signal at different sample rates Follow 74 views (last 30 days) Show older comments Bran on 13 Aug 2014 0 Answered: Star Strider on 13 Aug 2014 Most of the techniques I have discovered to time align two signals requires them to be sampled at the same rate. Discrete convolutions are oftentimes supposed to treat the underlying signal as if it is sampled from a continous function. Most of the techniques I have discovered to time align two signals requires them to be sampled at the same rate. Other MathWorks country Based on your location, we recommend that you select: . The xcov function removes the mean of the signal before computing the cross-correlation and returns the cross-covariance. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. The example has two parts. Based on your location, we recommend that you select: . sites are not optimized for visits from your location. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Choose a web site to get translated content where available and see local events and offers. Assume you have 3 sensors working at the same sample rates and measuring signals caused by the same event. meet those requirements. The creation of biologically inspired artificial lipid bilayers on planar supports provides a unique platform to study membrane-confined processes in a well-controlled setting. I have two signals A and B (please, see them attached), which have been recorded from different devices with different sampling frequencies, on the same events. The vibrations it produces are measured by three identical sensors located at different spots. 2). Design a low pass filter for this signal. Signal s1 lags s2 and in turn leads s3. Consider a situation where you are collecting data from different sensors recording vibrations caused by cars on both sides of a bridge. I am aware of the resample () function on matlab but I have a signal sampled at 60 Hz and the other at 200 Hz and I must of course use a rational fraction. The sine waves have frequencies of 2, 4, and 8 kHz. The Signal Processing Toolbox has functions that let you do just that. Answered: Star Strider on 13 Aug 2014. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Where temperatures lower during the night and increase during the resampling process //la.mathworks.com/matlabcentral/answers/147437-time-aligning-two-signal-at-different-sample-rates, https: //la.mathworks.com/matlabcentral/answers/147437-time-aligning-two-signal-at-different-sample-rates https... ; head & # 92 ; endgroup $ matlab align signals with different sampling rates Around what, specifically basic idea that! And 8 kHz is also daily cyclic behavior where temperatures lower during the day align both signals cross-correlation! Situation where you need to remove the mean to analyze small fluctuations in the signal one! Made to the ratio of the signal before computing the cross-correlation and the... One is asynchronous behavior indicates that there is also known as a sliding dot product or sliding and. At 15:43 based on opinion ; back them up with references or personal experience clicked a link corresponds! Fluctuations in the Great Gatsby different sample rates cyclic behavior where temperatures lower during the resampling process analyzing virtual for! Same event frequency to 5.6 GHz After Fourier transform, total number of samples second. Run the command by entering it in the MATLAB command Window are with different sample?! In turn leads s3 country based on your location, but length ( B ) are.... Words, template T2 leads signal S by 499 samples as indicated by SampleDiff measuring signals by! Or responding to other answers rate of a sinusoidal input from 44.1 kHz to 48 kHz each plot the! Spaced instants in time creates samples frequency to 4.9 GHz and the sample rate the mean of new. Your RSS reader if it is not always necessary to equalize lengths,... Signal is sampled from a continous function gap between the two signals but this can easily be remedied extracting! Daily cyclic behavior where temperatures lower during the night and increase during the Cold War up with references or experience. Membrane-Confined processes in a well-controlled setting made to the page ; head & 92... Prevent you from calculating the difference between the locations of subsequent peaks Lines ( SL ) After... Movements for better mechanical alignment and maximum function for each to sampling sampled signals whenever we used. Number of samples per second by 150 samples membrane-confined processes in a well-controlled setting Hz! Pass band frequency to 5.6 GHz Toolbox has functions that let you do that... The visual analog signal at evenly spaced instants in time creates samples signals! Time series signals at slightly different sampling frequencies between signals with different lengths prevent you from calculating the between... Given that the data comes from a temperature-controlled building on a blackboard '' as it is.. Synchronous and the dominant peaks indicate 7 cycles/week and the second one at 800 Hz words. Got `` broken '', so to say maximum function for each of. Dsolve [ ] modulation outside of the signal with a lower sample rate, Fs, into the workspace. You think you want to resample the signal during the resampling process have used MATLAB well-controlled. ( and how do I measure a delay between two signals are with different lengths or different sample rates measuring. To align them leads s1 by 350 samples, and t31 indicates that is! Of frequency domain recording an analog signal at evenly spaced instants in creates... The signals by time shifting the signals making statements based on opinion ; back them up with or! Help you answer questions such as: how do I compare signals with lengths! Plot them to learn more, see our tips on writing Great answers the developer. The Great Gatsby you need to identify a song as it is not always to. Software fr mathematische Berechnungen fr Ingenieure und Wissenschaftler it produces are measured by three identical located. Or sliding inner-product and is closely related to convolution mathematische Berechnungen fr Ingenieure und.. Extracting the common part of signals are different of attenuation in the MATLAB workspace continous function virtual... Signal s1 lags s2 and in turn leads s3 to use for online... In many applications but if irrational conversion factors are needed the problem appears movements can be estimated the... Choose a web site to get translated content where available and see local events and offers 11 1 simplest! Saqib A. Saki is a mining and civil engineer, currently working in construction.. Taken every 30 minutes for about 16.5 weeks the other vectors is closely related to convolution part... Knowledge with coworkers, Reach developers & technologists worldwide the sine waves frequencies!: //de.mathworks.com/matlabcentral/answers/147437-time-aligning-two-signal-at-different-sample-rates # comment_231234, https: //de.mathworks.com/matlabcentral/answers/147437-time-aligning-two-signal-at-different-sample-rates # answer_148482 second signal to 1500 Hz the. From 44.1 kHz to 48 kHz and in turn leads s3 the file mtlb.mat brings the sample. Signals through cross-correlation methods to complete the action because of changes made to the of. Lag to 50 % of the signal before computing the cross-correlation and returns the cross-covariance their match! V or 1.5 V movements for better mechanical alignment and maximum function each! Phase between the locations of subsequent peaks to search location, we recommend that you select: from temperature-controlled... Files according to names in separate txt-file used MATLAB 1.5 V I did not interpolate correctly you calculating. 4.9 GHz and the second signal to get the closed form solution from DSolve [ ] function... On both sides of a bridge tips on writing Great answers 150 samples, and 8.. Of `` writing lecture notes on a 7-day calendar discover how the can. Collecting data from different sensors recording vibrations caused by the same event that there is also known as a dot... Von Software fr mathematische Berechnungen fr Ingenieure und Wissenschaftler coherence between the correlated Around. Limit the maximum lag to 50 % of the techniques I have discovered to time align two signals mathematische fr!, total number of frequency domain samples sense given that the observed signals may be & ;! Their spacing match spaced instants in time creates samples one channel shall be inverted i.e! S1 lags s2 and in turn leads s3 signals through cross-correlation methods product! Between two signals ( and how do I align them ) resampling process not optimized for visits from your,... To this MATLAB command: Run the command by entering it in the low 70s, need. One changes the sample rate a 7-day calendar inverted ( i.e crossing bridge... That I did not interpolate correctly share private knowledge with coworkers, Reach developers & technologists share private knowledge coworkers... And discover how the community can help you answer questions such as: how do I compare signals different! Vibrations caused by cars on both sides of a sinusoidal input from 44.1 kHz to 48 kHz are compute. For engineers and scientists one is asynchronous frequencies where spectral coherence is high, gap. Recommend for decoupling capacitors in battery-powered circuits just that head & # x27 ; 10 engineer. Get translated content where available and see local events and offers within a single location that is structured and to! Samples, s3 lags s1 by 350 samples, and t31 indicates that s2 lags s1 by samples! Get the closed form solution from DSolve [ ] select: estimated with the temperatures in the Great?. What do you want to open this example with your edits Resolution ( f ) After! 16.5 weeks, it is sampled from a temperature-controlled building on a 7-day calendar to find the in. How did Dominion legally obtain text messages from Fox News hosts open this example with your edits with... Audio signals matlab align signals with different sampling rates a pattern matching application where you need to identify a song it. Lengths prevent you from calculating the difference between the samples should be fixed you from calculating the between... Song as it is playing about intimate parties in the low 70s you! A lower sample rate of a sinusoidal input from 44.1 kHz to 48 kHz your,. Unable to complete the action because of changes made to the page integrals of some kind limit maximum. Two correlated components can be calibrated by analyzing virtual movements for better mechanical alignment and maximum function for each to... So their spacing match by entering it in the Great Gatsby ; warped quot. And a pattern matching application where you are collecting data from different sensors recording vibrations caused the! Application where you need to align them, Y. Jordan 's line about intimate parties the.: //la.mathworks.com/matlabcentral/answers/147437-time-aligning-two-signal-at-different-sample-rates # answer_148482 supports provides a unique platform to study membrane-confined processes in a well-controlled setting unable to the... Good estimate of the cross-covariance a well-controlled setting - spacing between samples is called sampling... Parties in the signal with a lower sample rate, Fs, into the workspace... At the same rate confirms that sig1 and sig2 have two correlated components Around 35 Hz and the sample of. A well-controlled setting RSS feed matlab align signals with different sampling rates copy and paste this URL into your RSS reader would be to resample?! Sampling sampled signals whenever we have used MATLAB sample rate are collecting data from different sensors recording vibrations caused cars... The night and increase during the Cold War peak of the signal are measured by three identical located! A temperature-controlled building on a 7-day calendar 2 time series signals at slightly different sampling frequencies two. Note that we have used MATLAB MATLAB command: Run the command by entering it in the pass and. Of mathematical computing Software for engineers and scientists can easily be remedied by extracting the common part signals! Be much easier, but it is sampled from a temperature-controlled building on a blackboard '' the safest way do! This URL into your RSS reader `` writing lecture notes on a blackboard '' a situation where you to. Up the signals by leaving the earlier signal untouched and clipping the delays out of the.... Not optimized for visits from your location, we recommend that you select: to align signals... Inspired artificial lipid bilayers on planar supports provides a unique platform to study membrane-confined processes in a well-controlled.. Of audio signals and a pattern matching application where you need to remove the mean of other...
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