First Audio interpretation is a track with multiple channels.

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• acquisition of continuous sample with multiple channels

  Hello! Please tell me what I'm doing wrong here, I'm confused about how the acquisition of continuous sample with several channels (using NI USB-6215 boxes).

  Following code is python code, but I don't know who confuse you (and it's only a part of my code in order to not try, it won't work

  buffer_size = 2000 #samples to read
  sampling_rate_hz = 20000
  channels = "Dev1/ai0 ai1/Dev1" #this can be a string or a large number...

  CHK (nidaq. DAQmxCreateTask ("", ctypes.byref (taskHandle)))

  CHK (nidaq. DAQmxCreateAIVoltageChan (taskHandle, channels,"", DAQmx_Val_Cfg_Default, float64(-10.0), float64 (10.0), DAQmx_Val_Volts, None "))

  CHK (nidaq. DAQmxCfgSampClkTiming (taskHandle,"", float64 (sampling_rate_hz), DAQmx_Val_Rising, DAQmx_Val_ContSamps, uInt64 (buffer_size) "))

  CHK (nidaq. DAQmxRegisterEveryNSamplesEvent (taskHandle, DAQmx_Val_Acquired_Into_Buffer, uInt32 (1000), uInt32 (0), EveryNCallback_func, None))

  CHK (nidaq. DAQmxRegisterDoneEvent (taskHandle, uInt32 (0), DoneCallback_func, None))

  the callback function #and

  def py_EveryNCallback_func (self, taskHandle, event_type, nSamples):
  data = numpy.zeros ((self.channel_amount,buffer_size,), dtype = numpy.float64)
  read = int32()
  CHK (nidaq. DAQmxReadAnalogF64 (taskHandle, buffer_size, float64 (10.0), DAQmx_Val_GroupByScanNumber, data.ctypes.data, buffer_size * number_of_channels, ctypes.byref (read), None))

  With only one channel, everything's fine, and tension diagram looks like this:

  

  buffer_size = 2000, sampling_rate_hz = 20000

  But if I use two channels, voltage diagram looks like this

  

  buffer_size = 2000, sampling_rate_hz = 20000

  It looks like the sampling rate is higher or there are fewer values?, but with two channels with the results table is 2000 * 2 long and with a single result is 2000 * 1 long is not smaller

  most of the settings important (?) in my code:

  DAQmxCfgSampClkTiming "float64 rate": 20000 (sampling_rate_hz)
  'UInt64 sampsPerChanToAcquire' DAQmxCfgSampClkTiming: 2000 (buffer_size)
  DAQmxRegisterEveryNSamplesEvent "uInt32 nSamples": 1000 (?)
  'Int32 numSampsPerChan' DAQmxReadAnalogF64: 2000 (buffer_size)
  DAQmxReadAnalogF64 "float64 [] readArray": [[buffer_size] * number_of_channels]
  'UInt32 arraySizeInSamps' DAQmxReadAnalogF64: buffer_size * number_of_channels

  as you can see nSamples is a big question mark, but the problem still exists if I set variable buffer_size y (2000)

  Hi Dazzler,

  It is not a multi-channel example that ships with the driver, but after a quick look at the code that you use in your third post, everything seems to be configured correctly. The only thing I was thing I got a question about your plots. Looks like you draw each time the same number of points. If you draw just the table of data directly from the playback feature, you need to draw (buffer_size * number_of_channels) number of channels since the data returned is as an interlaced array. You can also choose to deinterleave samples. More information about this lie in the NOR-DAQmx C reference help, which is installed with the NOR-DAQmx driver.

  Kind regards

  Kent

  Technical sales engineer

• create file csv with multiple channels

  I am writing a program that uses the Keithley 705 scaner and 580 ohms meter. What I have to do is to create an excel file that contains a timestamp to MM/DD/YYYY HH: mmS as a column, then a new column for each channel (1 to 10 in the case of the keithley 705). Each channel column will contain reading the resistance of this specific at the parking meter channel. The timastamp should do when the first analysis was performed; for example if one scans the channels 1 and 2, their resistance values will be associated with the same timestamp.

  My question is how can I format it as an excel file.

  Answer your original query
  Set the number of channels (1-10)
  Organize your table value to it form the first column with timestamp and treatment of channel values, then write in the chain of worksheet
  You can include the header for your nominale1

• Export 6 channel discreet mono tracks (5.1 mix) I have only 2 tracks with audio compressed and 4 empty trace on my exit.

  Export 6 channel discreet mono tracks (5.1 mix) I have only 2 tracks with audio compressed and 4 empty trace on my exit. I use first Pro CC14, pasted below export settings and sequence settings.  Please help export feature for iTunes version trailer next week.  Ouch!

  

  So, I'm bad to think 5.1 sequence option is what you wanted. I'm sorry. You want to separate the 6 channels. Then with your initial configuration, your Audio Track mixing table appears as the posted screenshot?

  

• How to cut audio tracks with tool blade?

  Hello

  I recently made the switch from fcp7 to fcpx and I'm having a real hard time! There are many things that I can't understand how to do, and it's just one of them:

  Solo Cup audio tracks with the blade tool (or another medium, if there is). Can I cut the audio clips on one side, but how I cut a piece in the middle of the clip?

  Thank you!

  YYou can't cut with the blade tool? Or select it, and press Cmd - B of type point skimmer/reading

• How export a project consisting of 2 video tracks with many clips/effects and 1 stereo audio track so that the project can be worked into another compatible editing system?

  How do I export a project composed of 2 video tracks with many clips/effects more 1 stereo audio followed that project ACR is still worked in a

  
  

  compatible mounting system? Thank you!!

  When you export, you create a new video file that will have effects applied... in other words, a book finished

  Of course, this video 'complete' may be edited by someone else on another computer... but it SEEMS to me that what you want is for someone to take your editing, continue editing, THEN export a finished video

  Is this correct?

  If so, do some reading in the help file on the Manager project, so you can put your project and all files on an external drive to give to any other person

• Multiple audio passage requires separate tracks

  My Assistant has recorded accidentally on several different audio parts on one track is different and I don't know how to move them to separate tracks.

  The prayer you can help!

  Thank you

  No problem!

  Click on the number to take on the main track and select export to new leads

  

• Export DNxHD with 8 channels audio multi... Problem! the final file only stereo all mixed with 6 empty strings.

  I export DNxHD with 8 channels audio multi... My problem is that the final file all mixed in the first 2 stereo channels with the channels empty rest 6.

  I'm lost on what could be the problem.

  The main audio channel is 8 channels... NO stereo.
  Export, I chose DNxHD and audio 48000 Hz with 8 output channels

  
  What could this be? I need to deliver a film with the 8 mono channels.

  Really appreciate all the thoughts/help!

  Thank you

  Christian

  That's how I would implement mixer in CS6's using a sequence of 8 track with 8 mono channels (mono channels using maintains levels matching, stereo and standard tracks can cause differences in level of 3db). Note the Red output channel selection and the panpot position indicated in blue.

  

• Replace negative values in multiple channels with "0'.

  Hello

  I'm calculating and then by creating a cumulative channel, multiple channels. Negative values in these channels aren't necessary, and I need a nice way to replace each negative value in these channels with a value of '0'.

  My current code is:

  Do
  Do
  If Data.Root.ChannelGroups (2). Channels (i). Values (II)< 0="" then="" data.root.channelgroups(2).channels(i).values(ii)="0    ">
  II = ii + 1
  Loop until the second > Data.Root.ChannelGroups (2). Channels (i). Properties ("length"). Value
  II = 1
  i = i + 1
  Loop until I > Data.Root.ChannelGroups (2). Channels.Count

  It works, but I don't like. He adds a few seconds when running my script, which was almost instantly. Is there a better way to do it?

  Thank you.

  Hello Kevin,

  The fastest way to go through a channel and check the values less than or equal to 0 is through the canal's calculator. The code below takes all the channel first channel group (with the exception of the first string that is be the weather channel in my example data set) and replaces the values<0 with="" 0="" through="" the="" iif="">

  Set Group = Data.Root.ChannelGroups (1)
  
  iMax = Group.Channels.Count
  
  FOR i = 2 to iMax
  
    Adjust the strings = Group.Channels (i)
  
    Formula = "= IIF (y '.<0, 0,="">
  
    Call to calculate (formula, Array("y"), Array (Channel))
  
  NEXT ' I

  In this example we overwrite the existing values of data channel with 0, but you can also copy the channels to make sure that your raw data is available.

  The calculator of channel is extremely fast for this type of operation because it does not create a loop to go if each line separately and check the values he...

  I hope this is useful,

  Otmar

• Problem with multiple downloads with the router. Allows you to change the TCP MSS value?

  Original title: TCP MSS

  Hi all.

  I currently have a problem with multiple downloads with my current router.  If I have two current downloads at the same time I have no access to all web sites.  It's almost as if the downloads take my meaning of bandwidth there is more nothing for ordinary surfing.

  As a test I put an older router on my system and have a significant improvement in performance.  I have 2 downloads in progress and also surf at the same time.

  To compare two routers, I noticed that the only real difference between the two is that the TCP MSS value is set to '0' on the router of the problem, and then assign him 1392 (MTU - 40) on the router to elderly who gives better performance.

  It is my understanding that this value governs the size of transmitted packets.

  My question is this:

  What is the MSS value which is causing the problem?

  Congratulations in advance.

  Be sure to interpret the values. The '0' means no not literally because the link would not work. It is likely, that it allows the local device set limits for the link. Don't forget that there is a Maximum value and as such can be any value up to such limit as defined by all devices in the path.

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• Single unit with multiple clusters CCM

  I know that this horse has been beaten to death, but I couldn't find a specific answer to my question.

  I understand with multiple clusters, each CCM to the unit calls go on Ports configured as such in each cluster. I also understand that MWI notification is sent by the highest numbered track and he's working his way down until it is successful. What I don't understand, is how to transfer out of the unit for the expansion of the Subscriber. How do I know what CCM Cluster to send the call to unity? He sends it on the main cluster and this group is responsible for the routing of the call on an inter-cluster trunk? Or should he behave as MWI where he tries to send calls from the highest numbered port until it is able to place the call?

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• Gears - error when you try to insert values into a table with multiple columns

  Hello

  I started playing with the gears and SQlLite today and I get an error when I try to insert values into a table with multiple columns.

  I have:

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  Davy

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