Extract random portion of signal

If I am loading a signal from an LVM file, is there a way to extract a random portion of the signal? Just some background, I will be loading multiple files in through a for loop/case structure, and each of the files may be of different lengths, so I won't know ahead of time how long the signal is.
thanks,
George
Solved!
Go to Solution.

LVM includes the number of points in each segment header. You can get this by reading and parsing the header yourself. The spec is located here. The Express VIs presume that, being an ASCII file, LVM files are relatively small. As such, the entire file is read into memory by the Express VI. You can use the array or waveform VIs to easily extract a portion of this.
If you have huge files and this creates a memory issue, you can parse the file yourself. Look for the ***End_of_Header*** line. The next line is the column headers, followed by the data, one item per line. The bad news is that lines can be a variable number of characters long. This can make searching a long file for lines a very slow process. One option is to read the file in 65,000 byte chunks and process these serially to get the data you want (this is what LVM does internally to convert from ASCII to data).
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Hello Halle,
You can extract the audio form a movie clip by selecting the clip that you want the audio from then go to the drop down menu Modify > Detach Audio and then you will see the audio in green and then can move it to where you want it to be. Take a look at the article below for more information how to extract the audio from a video clip. Let me know if this helps
iMovie (2013): Add only the audio from a video clip
http://support.apple.com/kb/PH14710
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Extract a portion of a video file

I want to extract a portion of an existing video file. A movie is an hour and I would like to take the five minutes 0:10:00 to 0:15:00. The film does not need to be / should not have to be recoded. Is that possible? thx
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My understanding of your question is that you want to save a 5 minute section to a new file... correct?
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Importing Video http://forums.adobe.com/thread/1065281
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In full xml i need to extract some portion of xml and i need to store

Hi this is the xml i will get i need to store from olife tag please suggest some idea how to do
<TXLife>
<UserAuthRequest>
<UserLoginName>UserId</UserLoginName>
</UserAuthRequest>
<TXLifeRequest>
<TransRefGUID>0099962A-BFF3-4761-4058-F683398D79F7</TransRefGUID>
<TransType tc="186">OLI_TRANS_CHGPAR</TransType>
<TransExeDate>2008-05-29</TransExeDate>
<TransExeTime>12:01:01</TransExeTime>
<InquiryLevel tc="3">OLI_INQUIRY_OBJRELOBJ</InquiryLevel>
<InquiryView>
<InquiryViewCode>CU186A</InquiryViewCode>
</InquiryView>
<ChangeSubType>
<ChangeTC tc="32">Update / Add Client Object Information</ChangeTC>

<TranContentCode tc="1">Add</TranContentCode>
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<OLifE>
<SourceInfo>
<SourceInfoName>Client Profile</SourceInfoName>
</SourceInfo>
<Activity id="Act1" PartyID="Party1">
<ActivityStatus tc="2">In Progress</ActivityStatus>
<UserCode>123456</UserCode>
<Opened>2010-08-17</Opened>
<ActivityCode>CP10001</ActivityCode>
<Attachment>
<Description>LastScreenName</Description>
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<AttachmentType tc="2">OLI_ATTACH_COMMENT </AttachmentType>
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<OLifEExtension VendorCode="05" ExtensionCode="Activity">
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</ActivityExtension>
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<Grouping id="Grouping1">
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<Party id="Party1">
<PartyTypeCode tc="1">Person</PartyTypeCode>
<EstNetWorth>250000</EstNetWorth>
<LiquidNetWorthAmt>120000</LiquidNetWorthAmt>
<EstTotAssetsAmt>400000</EstTotAssetsAmt>
<Person>
<FirstName>John</FirstName>
<LastName>Doe</LastName>
<MarStat tc="1">Married</MarStat>
<Gender tc="1">Male</Gender>
<BirthDate>1965-05-07</BirthDate>
<EducationType tc="3">Associate Degree</EducationType>
<Citizenship tc="1">USA</Citizenship>
<NetIncomeAmt>70000</NetIncomeAmt>
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<ImmigrationStatus tc="8">Citizen</ImmigrationStatus>
<DriversLicenseExpDate>2012-05-25</DriversLicenseExpDate>
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<ActivityStatus tc="2">In Progress</ActivityStatus>
<UserCode>123456</UserCode>
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<AttachmentLocation tc="1">OLI_INLINE </AttachmentLocation>
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<SubActivityCode>CP20001</SubActivityCode>
</ActivityExtension>
</OLifEExtension>
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<EstIncome>90000</EstIncome>
</Household>
</Grouping>
<Party id="Party1">
<PartyTypeCode tc="1">Person</PartyTypeCode>
<EstNetWorth>250000</EstNetWorth>
<LiquidNetWorthAmt>120000</LiquidNetWorthAmt>
<EstTotAssetsAmt>400000</EstTotAssetsAmt>
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<FirstName>John</FirstName>
<LastName>Doe</LastName>
<MarStat tc="1">Married</MarStat>
<Gender tc="1">Male</Gender>
<BirthDate>1965-05-07</BirthDate>
<EducationType tc="3">Associate Degree</EducationType>
<Citizenship tc="1">USA</Citizenship>
<NetIncomeAmt>70000</NetIncomeAmt>
<DriversLicenseNum>D123456789</DriversLicenseNum>
<DriversLicenseState tc="35">New Jersey</DriversLicenseState>
<ImmigrationStatus tc="8">Citizen</ImmigrationStatus>
<DriversLicenseExpDate>2012-05-25</DriversLicenseExpDate>
<OLifEExtension VendorCode="05" ExtensionCode="Person">
<PersonExtension>
<NoDriversLicenseInd tc="0">False</NoDriversLicenseInd>
</PersonExtension>
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</Person>
<Address>
<Line1>125 Finn Lane</Line1>
<City>North Brunswick</City>
<AddressStateTC tc="35">New Jersey</AddressStateTC>
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<Phone>
<PhoneTypeCode tc="1">Home</PhoneTypeCode>
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Edited by: LRAJESH on Oct 21, 2010 1:50 AM

What have you tried? I know previous links that have been supplied to you on other questions have shown examples of extracting XML fragments from an XML document. Also, which version of Oracle (4 digits).

Iam developing an application using NI-DAQ(AT-MIO-16E)card on vc++ environment.My requirement to extract amplitude of AM signal(1khz(4step waveform) on 70Mhz carrier).Mr Ben suggested about sampling.

My application is having a device that takes 1khz and 500Hz clock and 70Mhz carrier.And generates AM signal(1khz(4stepwaveform)on70Mhz).
each step of 250 micro sec.
Iam using couter0 and 1 outputs of NI-DAQ card for generating clock.
I need to generate a clock through card and syncronously i should acquire the 4 step levels
of incoming AM signal(1khz(4 step) on 70Mhz)in each cycle.And i should generate error voltage like e1=(step1-step3) volts
e2=(step2-step4) volts
for each cycle i need to generate e1&e2
I am planning to use
DAC0 and DAC1 pins on ni-daq card for sending errorvoltages.
For implementation of whole thing.what
ni-daq functions should i use.
I am planning to use DAQ_Rate and DAQ_Start functions for sampling the incoming signal.
counter functions for generating clock.
Mr Ben suggested about sampling AM signal.
that is about 40khz.10 samples for each step.
I need some help regarding how to interface the incoming signal(AM signal) with the card.
could it possible to connect signal directly to ni-daq card one of the analog input channels?.
regarding sycronization of clock and sampling of
incoming signal please help me.
thank you for ur help

Your two best resources for developing any Data Acquisition application are the manuals for your board and the examples shipped with NI-DAQ. Your board's manual should have information regarding wiring. That is, it has a section dedicated to how to connect signals to your board.
The examples shipped with NI-DAQ show several Input/Output methods. These should give you a general idea (if not a specific application to your project) of how a Data Acquisition system would look (AI config, start, read, close, etc). These examples can be found in the \examples directory.

Random strength in signals

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Check the adapter in any other computer & then see if it works or not ...
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Best way to extract a portion of audio from a DVD-Video ?

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This VOB-EDIT ? http://www.videohelp.com/tools/VobEdit
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Hi, I have a string like "abcdef-ghik". I need to return "ghik" only. I have vb background and I could use Substring and Instring functions to do that. How can this be done in Java?

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I have to extract a portion from Graph .
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There is a picture with this, in which the portion in red box is the part i have to extract.
@nk
Solved!
Go to Solution.
Attachments:
Untitled.jpg ‏57 KB

Hi uday ,
Thank you for a fast response .
The VI in the above link shows how to extract a portion of graph with use of cursors. In my VI the user won't do anything . Everything should happen automatically.
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Untitled.jpg ‏57 KB

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manually extraction.JPG ‏50 KB

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Also, you should post more details, such as app type (iOS/OS X), what you're doing, compiler warnings/errors, and details about your system (hardware/software). Click on "My Public Profile" to the right (after you log in) to begin.
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I recently used my Cannon GL2 as a field recorder to record 16 bit audio sound effects.
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Hey Piero
Comestah?
I'm an Italiano too My Granparents are from Bari
Well yes thank you - that certainly answered part of my question
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I am considering there are three signals in my environment but I am interested in getting the signal having frequency 4 KHz.I am adding a Band Pass filter to extract that particular tone and making a delayed copy.Unfortunately I am not getting the output.Check my VI.Suppose if I have unknown signals in the environment and and I want to find out how many of them are are there and what are their frequencies, can we find ?can we visualize independently?
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Signal Extraction and Time delayed signal.vi ‏144 KB

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ni.com/support
Attachments:
Offset the X-Axis for One Set of Data.vi ‏144 KB

Extract random portion of signal

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