Software Defined AM Radio

After becoming familiar with the NI5640R, our team developed a software defined AM radio using a homemade antenna which passes through a LP filter with a cutoff frequency of 5MHz as the analog input to the card.
The host was then reconfigured to have a decimation value of 256 since we were only concerned with a single radio frequency at baseband. The acquired data was then AM demodulated, sent through a digital filter, and decimated further to account for the specifications of the computer speakers. The decimated array was then used to build a sound waveform. Using the appropriate sound VIs, the waveform was played.
We created two hosts which play this waveform--one of which plays it using a finite sample and another which plays it continuously. The finite sample radio simply builds a finite array when the host is started. Once stopped, the built waveform from the collected data is played through the speakers.
The continuous sample radio continuously builds the waveform and plays it while building the next waveform; however, some problems occur here. The processing time used to manipulate the acquired data allows for some lag when the sound is being played. We found this out by playing a normal AM radio at the same time as the LabVIEW AM radio and noticing the delay. Also, not only does the software radio delay, once the number of samples per channel is reached, the radio repeats a portion of the output sound which increases the delay from the real radio even further. Both the delay and the time at which the radio repeats is directly proportional to the number of samples/channel.
Now that we have a better understanding of configuring the host, we would like to do the previous on the fly using the FPGA. This would allow for no delays and faster processing on the host.
We have attached our work up to now. The sample rate of the sound format should be set to 48828.125 Samples/second and 16 bits/sample. If have any questions or suggestions, please post them here.
Matt LyssyNathan McCrory
Troy Perales
Mobile Integrated Solutions Laboratory
Texas A&M University
Attachments:
ni5640R AM Demod.zip ‏3532 KB

Doge-
Take a look at the Griffin iMic <iMic>. I think it has the USB capability you need, but you may not be able to interface it to the iPad. The only iPad USB connection is via the Camera Connection Kit. It may not be possible to use this for other types of data because of Apple's restrictions.
It may be possible to interface stereo audio to the iPad via BlueTooth. Perhaps you can find an iPad App developer who will help you.
Fred

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Disk /dev/sda: 40.0 GB, 40020664320 bytes
255 heads, 63 sectors/track, 4865 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x08820881
Device Boot Start End Blocks Id System
/dev/sda1 1 6 48163+ 83 Linux
/dev/sda2 * 7 1281 10241437+ 83 Linux
/dev/sda3 1282 1330 393592+ f W95 Ext'd (LBA)
/dev/sda5 1282 1330 393561 82 Linux swap / Solaris
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/dev/sdb1 1 6 48163+ 83 Linux
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/dev/sdb5 1282 1330 393561 82 Linux swap / Solaris
Disk /dev/sdc: 4016 MB, 4016046080 bytes
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Disk identifier: 0x00681f73
Device Boot Start End Blocks Id System
/dev/sdc1 * 1 489 3921888+ c W95 FAT32 (LBA)
Partition 1 has different physical/logical endings:
phys=(487, 254, 63) logical=(488, 65, 25)
and my ls -l /dev/disk/by-uuid:
total 0
lrwxrwxrwx 1 root root 10 2014-12-05 14:44 2cfa08ec-f738-11da-8e32-bbd5b9627316 -> ../../sda2
lrwxrwxrwx 1 root root 10 2014-12-05 14:44 9340cd5c-f738-11da-9b27-fbc3f2afcb6d -> ../../sda1
lrwxrwxrwx 1 root root 10 2014-12-05 14:42 FEE0-AD1E -> ../../sdc1
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Hello Marc,
Do you mean than you want everyone have their own personal share folder? And need to limit the folder size?
I think you can use the FTP server function in Windows server.
About FTP, it is recommended to ask in the Windows server forum, the professionals there will be glad to help you.
https://social.technet.microsoft.com/Forums/en-US/home?forum=winserverfiles
Thanks for your understanding.
Best regards,
Fangzhou CHEN
Fangzhou CHEN
TechNet Community Support

The future of IT is in Software Defined Infrastructure, but what about IT Ops?

We’ll be talking about Intel’s Software Defined Infrastructure and how the SDI principles extend to and integrate with Software Defined Operations next Tuesday. What's your take? Click here to join us.

Hi Joginder,
I‘m writing to check if the suggestions were helpful, if you have any questions, please feel free to let me know.
If you have any feedback on our support, please click here.
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Anna
TechNet Community Support
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact [email protected]

Audio sample rate 192 k but seem less than that (about 20% less) when i run software defined radio .

I bought Pavilion dm4-1000au with Win7 Starter as original OS. My target is to get full Sample rate of Audio 192 K when I ran Sofware Defined Radio like Softrock SDR. Actualy I only get less than 100% of sample rate. So, frequency coverage of SDR become less than I prefered 192 KHz.
What I have done is up dating Audio driver from HP Support/ Driver Download center only.
How to solve this problem ?.

Thank you for your input.
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PCG

Can't connect to Software Update, Stream radio in iTunes, etc...

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I can't say 100%, but I believe this may have all started to happen after my 10.4.5 update
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hey_surburbia it is impolite to bump threads in this way
In order to help you can you list your setup.
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Am looking for software that allows me to capture the radio stream of certain radio shows I am interested in copying....
thoughts?

Rory--I use, and highly recommend, Audio Hijack and Audio Hijack Pro by Rogue Amoeba. Audio Hijack will record to AIFF format, which can then be imported into iTunes and converted to other formats. It works great for me.
Audio Hijack Pro adds even more features for people who do this more frequently, or who need more control. You can record, for example, not just to AIFF, but to MP3, AAC, Apple Lossless, and using any number of bit rates and other settings.
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http://discussions.apple.com/thread.jspa?threadID=423862
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Power Mac G5 1.8 DP Mac OS X (10.4.6)

Is there any example for a software transceiver in labview / labview modulation toolkit ?

hi everyone
i am sure you have heard of this a lot ..... but i am new (like 20 minutes old) to labview. i am quite fimiliar with matlab and other programming languages. i am doing a project based on software defined radio. for that i understood an example demo from matlab where a fully functional software transceiver has been built as an example.
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regards
khurram

Hi khurram,
did you look for examples with the ExampleFinder?
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GerdW
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Eric P. Nichols
P.O. Box 56235
North Pole, AK 99705

Howdy!
Actually, North Pole is a small town about 15 miles SE of Fairbanks. Quite a few Labview users here....don't know about the REAL North Pole, though!
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Eric P. Nichols
P.O. Box 56235
North Pole, AK 99705

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I am not sure if I follow you on this one.
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The bare-metal process requires both PXE and
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Kristian (Virtualization and some coffee: http://kristiannese.blogspot.com )

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Hi Friend's.
I have define 2 Radio button
on Module-pool screen.
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How can i assign the function code for
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pls can any one help me

Hi,
For radion buttons, what ever the name you will give that name only will hold that value ( Either selected or not ). But this variable should be declared as global variable in main program.
Still if you want to assign function code, you can assign one like other fields on the screen.

Radio Buttons + Required Input/Output Fields in Dialog Programming

Hi All,
Please find the below issue.
I have 2 Radio buttons
RB1 and RB2 defined in group RG.
And by default RB1 is selected.
I also have 3 Input.Output Fields.
F1 , F2 & F3.
Now before displaying the Screen for the end user,
I need to display as follows:
A)
RB1 = X -
> Selected.
RB2 = Space -
>Not Selected.
F1 -
> Visible.
F2 & F3 -
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B)
RB1 = space -
> Not Selected.
RB2 = X -
>Selected.
F1 -
>Invisible.
F2 -
>Visible.
F3 -
>Visible.
When i am debugging, the value of RB1 is not X though it is selected on the screen (by default due to Radio Button Group) & hence the below code is not working.
*_PBO:_*
LOOP AT SCREEN.
IF RB1 = 'X' AND ( SCREEN-NAME = 'TXT2' OR SCREEN-NAME = 'TXT3' ).
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ENDIF.
Modify Screen.
ENDLOOP.
But when i select RB2 = X on the screen.
Value is getting populated .
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Sri.

Alright, you defined the radio buttons and grouped them. Did you also assign Fcode to the radio button group? if not already assigned the assign something to FctCode to the radio button. If you can double click on one and assign a name, this will automatically assign to other one. If you already did that... just ignore it.
Next, by defualt, RB1 will not be having 'X' though it shows selected but you can always make it by just writing the following statement in PBO (If you dont want to mislead anybody)
if RB1 = space and RB2 = space.
RB1 = 'X'.
endif.
If you have already done that the next step would be.... Assign a screen group value to the fields F1, F2 and F3.
for example, double click on the field F1, add GR1 in groups in first box and do the same for field text/label if any. Same way, assign GR2 to F2 and F3.
Then add the following code in PBO. (Someone or you can write it better. This is just an example)
LOOP AT SCREEN.
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       endif.
    endif.
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    endif.
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ENDLOOP.
Good luck... It is working code.,

[TV@Master] NEW SOFTWARE

Hello,
Guess what, there's a software/driverupdate
http://downloads.msi-computer.nl/index.php?dir=TVsoftware/
Username: guest
Password: 123welcome
Too bad I can't add any channel with the new software, but the radio works like a charm.

Hello,
Guess what, there's a software/driverupdate
http://downloads.msi-computer.nl/index.php?dir=TVsoftware/
Username: guest
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Radio button in table

Hi Experts
My Problem is i need 2 RadioButtons in a Table.so i have inserted 2 RadioButtons (Accept & Reject)in
cellEditor and i have binded those values to the boolean value which is coming from the BackEnd
.but my problem is i can select both the radiobuttons and on selecting it is showing an error
is Not A Valid value.but i need only one radio button to be selected for a row.How can i get this?
Regards,
Asif

I forgot to say that the value node must be non-singleton (singleton=false) such that it exists for every parent node element (table row).
Say you have the following context structure:
Rows (node, c=0:n, s=0:n)
-- Selection (node, c=1:1, s=1:1, singleton=false)
---- value (string)
Add two table columns "AcceptColumn" and "RejectColumn", and add two RadioButtons "AcceptButton", "RejectButton" as cell editors. Bind the "selectedKey" property of both radio buttons to attribute "Rows/Selection/@value". Further assign an action (at least a dummy action) to both buttons.
Now, to initialize the values for the table rows, write code like
for (int i = 0, n = wdContext.nodeRows().size(); i < n; i++)
IRowsElement row = wdContext.nodeRows().getRowsElementAt(i);
/* this line defines which radio button should be selected in the row at index i: */
row.currentSelectionElement().setValue("accept"); /* or "reject" */
To check the value of the radio buttons in row at index i:
IRowsElement row = wdContext.nodeRows().getRowsElementAt(i);
String value = row.currentSelectionElement().getValue();
if ("accept".equals(value))
else if ("reject".equals(value))
else
/* null or illegal value */
Armin

Software Defined AM Radio

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