No Signal W/ Line In

I have a powerbook aluminum 1.5 ghz and i'm having trouble getting the line in to work all the time. only one of my friends 1/4 inch to 1/8 inch adapters will seem to work properly. and now my plantronics headset will not pick anything up. The Headset is an "ultimate performance headset/ Audio 90".
Will my mac only work with certain input recording devices? or is there something i can do?
Thanks

Hi HangTime -
Yes, I realize that w.r.t. your response for G B0mb. Just making sure nobody forgot about me.
Your explanation makes sense. I tried it out and it does indeed work. So in GB, "built-in" means whatever the system pref says, whereas on the system pref, you can choose between built-in and line in. A little screwy but I understand.
Anyway, thanks for the help, it's working great for me now!!
Tony
p.s. Sorry I can't add points to you for this since it's not my thread, but I'll send some karma your way...

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Transfer audio signal to LINE-OUT connector

Hi all,
Is there any way to transfer the audio signal which is generated by means of a Built-in speaker on the motherboard to the
Line-Out connector?
Baiscally, i want to acquire the voltage signal and view it on the oscilloscope. But the problem is that
the signal is not on the " LINE-OUT Connector ", it is on the buit-in speaker on the motherboard.
Any help will be greatly appreciated.

Hello,
Are you using LabVIEW or other National Instruments products to acquire or analyze this signal or are you simply wanting to pass the sounds generated from the on-board speaker to the line-out connector?
Thank you,
Justin
Justin
National Instruments
Product Support Engineer - Conditioned Measurements

M-Audio FastTrack USB - very low signal level (line/guitar)

I've used FastTrack USB for a couple of years with a microphone through the XLR input with no problems. Now I am trying to connect a line output of a synthesizer to the line input of the FastTrack and the signal level is very low. There is no noise, it's just quiet, even with the track volume all the way up it's still no match for the rest of the tracks.
Any suggestions, except for trying all the knobs and switches on the face and back of the unit (tried that already)? Anybody has similar setup?
I use FastTrack for audio input, and built-in audio for output, it's connected through a hub (no problems for two years). In GB microphone is going to the Channel 1 (mono), and still works fine. Synthesizer goes to Channel 2 (mono) and is really quiet. I tried the syn with two different 1/4 cables with no difference. The headphones jack on the front of the FastTrack works fine with the normal level adjustment range, and if I plug in the headphones directly into the line out of my syn, I have sound, quiet (like you would get by connecting headphones to any line out, turntable even) but steady, so the syn must be fine.
Any thoughts?

No takers. Hm. OK. After some more research on the Net it appears to be that all the Fast Tracks suffer from the same problem, which makes me believe that it's not a bug, but a feature of an unexplainable kind. Oh, well, back to my old iMic noisemaker (this one works, it's just screened very poorly, so it picks up all the possible interference, and also makes its own little nasty hiss--this is why I switched to the Fast Track a while ago--so I will need to cut it out with an EQ, again). Hopefully, the EQ surgery will not affect the synthesizer's sound consistency as severely as it use to do with a microphone.

No signal from line in in Garageband, though okay in OSX!

My line in jack is clearly working in OSX - in System Preferences/Sound, the "Line In" input meter reads my guitar as I play it, with a good signal strength. In Garageband however, no matter what I've chosen in Sys Prefs, all "Real Instruments" activate the built-in microphone ONLY. I have used Garageband many times on a powerbook (G4) successfully, plugging a guitar directly into the line in jack. Yes, the gain is a little bit low, but is fine, and I've recorded plenty of guitar based music (indeed Apple suggests such a direct connection in their literature).
The problem just seems that Garageband is not switching over to line in when I switch it with the operating system. I cannot get the internal mic off. Help! Any suggestions?
Thanks!
Kip

I wish the software's help file mentioned this as clearly as you! They seem to suggest doing it only with Sys Prefs (see below). Thanks.
"You can connect an electric musical instrument or microphone to your computer and record it in a Real Instrument track. There are several ways to connect instruments and microphones to your computer.
To connect an electric musical instrument or a microphone to your computer:
If your computer has an audio input port, you can connect a microphone or an electric instrument to it. When using the audio input port, be sure to set sound input to "Line in" in your computer's Sound preferences. Open System Preferences, click Sound, click the Input button in the Sound pane, select "Line In" in the sound input list, then drag the Input volume slider to set the input level.
You can connect an audio interface to your computer, then connect instruments and microphones to the audio interface for recording. Audio interfaces are available in a variety of compatible formats, including USB, FireWire, PCI, and PC card formats. When using an audio interface, be sure to choose the interface from Audio/MIDI pane of GarageBandPreferences.
You can also connect an audio mixer or console to your computer, and record microphones or instruments through the mixer.
If you use an audio interface to connect musical instruments, check the manufacturer’s specifications to make sure the interface is compatible with Mac OS X 10.2.6 or later. Also make sure the audio interface uses a format supported by your computer. Follow the manufacturer’s instructions, which may include installing the correct driver on your computer."

Can I trigger the read of a buffer period measurement with a external signal (PFI line) with my 6602 card? How can I do it?

I am doing a buffered period measurement with a 6602 card, Labview real time. I want to measure the period of 6 rising edges of a TTL, but I want to do it exactly when an edge comes on other external signal (of course slowler than the previous one), that is to say that I want an external start trigger. Can anybody help me? I have hardly searched at the web and I have not found an example of code of what I am looking for.
Another question:
After reading the buffer, how does my program know that the data has been refreshed in a continuous measurement? I attach two VIs I am trying to make work and a quite explanatory bmp of what I
want to do.
Thanks.
Attachments:
rtc_regimen.zip ‏3 KB
Buffered_Period_pulse_generation.vi ‏283 KB
simgle_counter_pulse_generation.vi ‏177 KB

Hello;
I can't think of any way to accomplish that task. Once the counters have only two input pins, and both are in use when one configures the counter to do buffered measurements, there isn't a way to trigger that operation in hardware.
I'm not sure if I understood your second question, however, the buffered operation on a counter is hardware controlled, meaning that a pulse on its gate input triggers the transfer of the count value from the counter register to the PC memory buffer. That is therefore a continuous measurement.
Regards
Filipe A.
Applications Engineer
National Instruments

Live5.1: Is surround or 4 speakers from line-in VCR poss., surround ev

I have finally got two pairs of powered speakers to plug into my Li've5. X-Gamer boxed card I got a few years back. When I play mp3s or CDs music from the pc CD player both the line out and rear outs play, both the same stereo i guess, when I turn both pairs on. I don't know whethere or not it has mattered what Sounds, settings in Windows XP I have as speakers type set to in Control Panel. I have NO creative software installed. Just what windows update gave me when it recognized my card. I am using WMP9. My CD player is a Pioneer DVD-6 non-tray (so it has no digital output), but I do have the CD audio line connected to the Li've 5. card, as well as the pci slot. I have never tried a surround DVD movie so I don't know if 4 speakers is giving me surround or not. I have a cheesy DVD or two, and I am getting sound from 4 speakers, but I'm not sure if it is in "simulated surround" or dolby surround (or a simulated 4 speaker version of dolby surround).
There is a line-in on the back of the sound card, and I have JUST plugged in a hi-fi VCR. With both pairs of speakers on, I get no rear sound channel. Therefore, definetly no 5.:
Questions
: Is it possible to get rear channels as well from line in (dual stereo) as above from line-in?
2: Is it possible to get a surround-loaded stereo signal from line-in (VCR) decoded into both the line outs and rear outs, as either Dolby SURROUND , or simulated SURROUND?
3: Is it possible to create Surround effect out of mp3s or pc CD music in 4 speakers?
4: Do I need to install the creative software?

I have finally got two pairs of powered speakers to plug into my Li've5. X-Gamer boxed card I got a few years back. When I play mp3s or CDs music from the pc CD player both the line out and rear outs play, both the same stereo i guess, when I turn both pairs on. I don't know whethere or not it has mattered what Sounds, settings in Windows XP I have as speakers type set to in Control Panel. I have NO creative software installed. Just what windows update gave me when it recognized my card. I am using WMP9. My CD player is a Pioneer DVD-6 non-tray (so it has no digital output), but I do have the CD audio line connected to the Li've 5. card, as well as the pci slot. I have never tried a surround DVD movie so I don't know if 4 speakers is giving me surround or not. I have a cheesy DVD or two, and I am getting sound from 4 speakers, but I'm not sure if it is in "simulated surround" or dolby surround (or a simulated 4 speaker version of dolby surround).
There is a line-in on the back of the sound card, and I have JUST plugged in a hi-fi VCR. With both pairs of speakers on, I get no rear sound channel. Therefore, definetly no 5.:
Questions
: Is it possible to get rear channels as well from line in (dual stereo) as above from line-in?
2: Is it possible to get a surround-loaded stereo signal from line-in (VCR) decoded into both the line outs and rear outs, as either Dolby SURROUND , or simulated SURROUND?
3: Is it possible to create Surround effect out of mp3s or pc CD music in 4 speakers?
4: Do I need to install the creative software?

Line input failed

I can't get any line input signal to show up now, either in OSX or in XP Pro (bootcamp). My input source is not a mic, so I know reduced input voltage is not the issue. I also know that I have the Audio Midi Setup settings properly configured.
I've tried this in Audacity & QT Pro 7.5.5 on OSX & in sound recorder on XP. It appears that there is no input signal to be had through the line-in. In the past I could get a signal through line-in. I know the cable input cable is good, I know the signal is coming through the input cable, but there is no line-in signal showing in the applications.
I saw some old, archived forum discussions about this problem, which suggested that the issue was related to OSX 10.4 updates 10.4.10 and later, but there were no answers or solutions there. The fact that the problem appears in both OSX and XP leads me to think it may be hardware and not software.
Any ideas?

Hello: Thank for your answer, I took some of your code, and did this:
# Check the number of arguments that could be passed.
if [[ ${#@} != 2 ]]; then
echo "Wrong # of parameters...Use: check<inputfile> <outputfile>\n"
exit
fi
#Inputfile: is in position 1 on the ARGS
inputfile=$1
#Outputfile: is in position 2 on the ARGS
outputfile=$2
MIN_LENGTH=100
MATCH_PATTERN="5698"
#Read all the lines of the file.
# Notice: "read -r" Do not treat a backslash character in any special way.
# Consider each backslash to be part of the input line.
while read -r line
do
len=${#line} #Store the length
pattern=${line:0:4} #Store the first x chars for contrast with [MATCH_PATTERN]
if [[ "$len" -lt "$MIN_LENGTH" && "$pattern" = $MATCH_PATTERN ]]; then
(( ++count ))
echo "$line" >> "$outputfile"
fi
done < "$inputfile"
printf 'Number of registers: %s\n' "$count"
But I have some questions:
I) In your code, why use:
done < inputfile
. I don't get it. With the "while" is not enough to read all the file.
II) Is it OK to use inputfile=$1 and outputfile=$2 that way?
III) I did not find why (( ++count )) works in shell! Using
let count = count + 1
works, but that way you did it is more elegant.
IV) Puting "exit" at the end is redundant?
Thanks for the guide, is more compact that the one I was/am reading
Last edited by gromlok (2011-09-25 04:03:44)

Line-in mic for new iMac.

I'm like 2-days new to mac-using so stay with me here.
I just got the new iMac 24" 2.4ghz.
I'm having a hard time getting my Logitech standard-in (non-USB) mic to work. The headphones work while plugged in, but the mic doesn't seem to be working. I can get the mic to work on my PC, but I don't have any other mics to try on this Mac.
Anyway: I go System Preferences-> Sound-> Input.
When the built in mic is selected the input level will display incoming sounds. But when I switch over to the line-in with my mic plugged into the line-in I get nothing. Do I maybe have to allow access for this jack to work?
My mic is not muted.
If it means anything: when I am unplugging the mic the input level will display some incoming sound, but only right after jacking-out (hehe). I was able to playback the sound that was being input and it just likes like a book was dropped on the floor. Not anything loud, just a short soft "thud".
I appreciate all ideas, thanks.

The audio-in port on Mac computers requires a line level input. Most PC mics don't work with a Mac unless you run them through a preamp, such as iMic, to boost the signal to line-level.

Line out volume ?

hello there,
iPhone seems to ignore the volume control when using the line out (base station)... Any clue why does this happens ? I was able to plug my previous iPod on my car but now the P2 cable dont fit the iPhone jack so I have to use the line out jack. Having volume always on max is disturbing

AFAIK, Line level is an industry standard (or theoretically standard) 'level'. Everything that outputs to line level should register on say a mixing desk as the same volume.
There could be one or two things happening here. Either the iphone's line out is weak and not outputting the right signal, or it could be the system's your're plugging into.
Line level connections are a bit like scart connection on yout tv. It bypasses the tuning circuitry of the output device and the tv to give a higher quality signal. Line level bypasses the heaphone amp of the iphone and often the 'pre-amp' of the speaker system going straight to the power amp. So bypassing 2 levels of amplification.
Maybe your bose soundwave has an internal pre-amp for the radio, cd etc which for some reason the line out doesn't go through.
I have a small Sharp HiFi (from the days when minidisc ruled) that has a seemingly weak line input. I've tried all manner of devices through it, but they are all much quieter than the built in radio, cd and md.
You could try either the headphone out like I say that uses the built in headphone amp to boost the signal, or perhaps look for an external preamp.
you could find out if the iphone's line out is def weak if you know someone with a hifi separates system. All the connections between modules are line level, so plug in to say the tape or cd 'in' on the amp section and see if the volume matches the rest of the system.

My line in sound doesn't seem to work, what's wrong with it?

I've tried plugging in several mircophones with 1/8" jacks ( I think that is the small standard headphone ones.) The thing is none of these work. The problem is they all say they work with mac. I need to get one of these to work. I've gone to the system prefs and go to the sound settings and I don't get any farther in my mission to get this to work. Please and thank you to the help I get.

Hi
First up when you go into Speech you are using the built-in microphone which has sufficient 'gain' in the circuit in order to work.
When you plug an external microphone into your PB you are actually plugging a microphone into a 'line input' that is an input designed to accept signals at 'line' level not microphone level. So you either need to get yourself a microphone amp to boost the signal before the input to the PB or a 'line' level microphone. Same thing really except the amp is included in the microphone.
Hope that helps.
Phil

Detecting a noisy signal

Hi All
Which is the most efficient method to differentiate a noisy signal from a normal one. The application receives signals and it should be able to determine if the signal is noisy or not pragmatically. There is also a threshold value for the spikes in the noise which it should consider.
Thanks for your time in advance...
Regards
Ibbu...
Solved!
Go to Solution.

Your question is obscure.
"Noise signal" itself can not provide enough information. For example, when you acquire a mono-tone sound with a microphone, the tone signal or sine signal is a useful signal, the noise is the backgroud noise. But when you acquire ECG signal corrupted by power-line noise, ECG signal is useful signal and the sine signal (power-line noise) is the noise. There are different signal processing methods to seperate "signal" and "noise" based on the different types of "signal" and "noise". For example, if the noise is sine, you can use a simple notch filter to remove it. But if the noise is wide-band and non-stationary, you will need use some advanced signal processing methods like wavelet, Garbor or adaptive filter.
The best way for you is to put a sample VI, so that I can help you to find a solution.

6602: Want to route a dedicated DIO (0-7) Line configured for output to a RTSI line

PXI-6602: I want to use a dedicated DIO (0-7) line configured for output to trigger all 8 counters on the 6602 card. The counters are configured for two-signal-edge-separation measurement. I Have tried to use Route-Signal.vi to route PFIn (0-7) to RTSI bus with no luck.

You should be able to trigger counters on the 6602 using the Digital Lines DIO (0-7).
Use the Set Attribute VI and set the attribute value type to Enabled and attribute ID to Start Trigger.
Wire the output of Set Attribute Task ID to the Task ID input of the Route Signal VI. Select the start trigger for the Signal Name input, PFI n for Signal Source input and PFI line Number for Signal Source Line Number input. Try this and see if this works.
Regards,
Bharat Sandhu
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National Instruments."
Penny

Signal.h and strict ANSI

Errors are detected in signal.h when compiled in strict ANSI mode.
As an illustration, sigtest.c:
#include <signal.h>
int main (void) { return 0; }
The command "cc -c -Xc sigtest.c" returns:
ucbcc: Warning: "-Xc" redefines compatibility mode from "SunC transition" to "strict ANSI"
"/usr/ucbinclude/sys/signal.h", line 309: warning: tokens ignored at end of directive line
"/usr/ucbinclude/sys/signal.h", line 314: warning: tokens ignored at end of directive line
"/usr/ucbinclude/sys/signal.h", line 327: warning: tokens ignored at end of directive line
"/usr/ucbinclude/sys/signal.h", line 363: warning: tokens ignored at end of directive line
"/usr/ucbinclude/sys/signal.h", line 382: warning: tokens ignored at end of directive line
"/usr/ucbinclude/sys/signal.h", line 389: warning: tokens ignored at end of directive line
"/usr/ucbinclude/sys/signal.h", line 397: warning: tokens ignored at end of directive line
"/usr/ucbinclude/sys/signal.h", line 400: warning: tokens ignored at end of directive line
"/usr/ucbinclude/sys/signal.h", line 413: warning: tokens ignored at end of directive line
"/usr/ucbinclude/sys/signal.h", line 428: warning: tokens ignored at end of directive line
"/usr/ucbinclude/sys/signal.h", line 429: warning: tokens ignored at end of directive line
"/usr/ucbinclude/sys/signal.h", line 439: warning: tokens ignored at end of directive line
"/usr/ucbinclude/signal.h", line 49: syntax error before or at: int
"/usr/ucbinclude/signal.h", line 49: warning: undefined or missing type for: int
Any suggestions ?
BTW, it has been done on (uname -a):
SunOS medusa 5.8 Generic_108528-12 sun4u sparc SUNW,Sun-Blade-1000
Thanks
MK.

Compiling the program below:
To investigate: SunPro compilation with -Xc (strict ANSI) causes errors with struct
sigaction and sa_handler.
#include <signal.h>
#include <sys/signal.h>
#include <siginfo.h>
#include <stdio.h>
static struct sigaction sigNext;
static void sigHandle(int sig, siginfo_t info, void context) {
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int main(int argc, char* argv[]) {
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     struct sigaction sa;
     sa.sa_handler = sigHandle;
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     *crash = 0;
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With the defaults:
$ /opt/SUNWspro/bin/cc -c test.c
$
With the strict ANSI option:
$ /opt/SUNWspro/bin/cc -Xc -c test.c
"test.c", line 15: undefined struct/union member: sa_handler
"test.c", line 15: cannot dereference non-pointer type
"test.c", line 15: function designator is not of function type
"test.c", line 20: incomplete struct/union/enum sigaction: sa
"test.c", line 22: undefined struct/union member: sa_handler
"test.c", line 22: warning: improper pointer/integer combination: op "="
"test.c", line 23: undefined struct/union member: sa_flags
"test.c", line 23: undefined symbol: SA_SIGINFO
"test.c", line 25: warning: implicit function declaration: sigaction
"test.c", line 11: incomplete struct/union/enum sigaction: sigNext
cc: acomp failed for test.c
$
What's wrong?
-- Doug

Custom scale causing flat line

I'm new to Labview and am using version 7.0, SCB 100 board, and a PCI 6031E card to read a signal from a pressure transducer.
I have a configured a virtual channel to read the voltage as follows:
Input terminal configuration: differential
Minimum value: -5V
Maximum value: +5V
The units are from a custom scale that takes the voltage value and converts it to a pressure in bar.
The signal to the board is 126mV. A custom linear scale is added to convert the voltage to a pressure value. The scale (272 bar/V) was created in MAX and added to the virtual channel. Without the custom scaling applied the signal is displayed as expected. However, when the scale is added the pressure signal flat lines around 27.3 bar. When the Maximum value field of the virtual channel is set above this value (such as 28) the signal appears, but at a higher value than expected and much noisier.
There are several other pressure signals being measured that use the +/- 5V setting with similar (515 bar/V) custom scales and they are working fine. It seems very odd that the range must be set at 28 to get a signal. I read that the range is set after custom scaling is applied, but the other pressure signals are also scaled and work fine with the +/- 5V. Any suggestions on what might be causing this and how to fix it would be much appreciated.

Hi KVB,
What is happening is that the range you set is for the scaled signal not the range for the incoming signal.
Try setting the range to what the expected range is for the scaled signal and you should find that this problem is eliminated.
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FP-AI-110 Multiple Channels - Signal Degredation

We have a FP-AI-110 set up with a FP-PS-4 and communicating back over a FP-1000. Set-up to read Current. -21 to 21mA
I had a customer ask if connecting more than one signal input line to the AI-110 would cause signal loss on the multiple channels, getting worse with the more channels that are connected.
Is this a concern with this module?
Ryan Vallieu
Automation System Architect
Solved!
Go to Solution.

The above is incorrect, I was getting questions through a second non-technical party trying to translate....
They really wanted to know the input resistance on the channels that causes the voltage drop for the current sensing, and what the minimum voltage would be. I see from the literature that it is 100 Ohms resistance on the inputs.
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Ryan Vallieu
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No Signal W/ Line In

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