something about the sound card

[hityue]

I use the sound card of my computer  to input and analyse the sound,and I select the SI VIs for my job,but I have some problems.

1,when I check the graph of the sound,the graph is full of the lines.Maybe the voltage of the signal is out of the max voltage of my sound card.

where can I change the Gain or some other ways to collect all the signals.

2, I use a filter before I send a wav to the spectrum graph,but I can still see the line  above my cutoff frequency,why?

Thank you.

[tinnitus]

Hy, could you send your vi for better answers

Best regards

Tinnitus

[hityue]

The sound I collect is from the speaker of the car,so it may be very loud.

Thank you!

[tinnitus]

sorry i'm still 8.5 could you "downgrade"

@+

Tinnitus

[hityue]

here it is.

Thank you.

[tinnitus]

Hye,

no pb encontered,

could you send capture of your "lines"

did you try to open the recorded file with goldwave of soft like that to read the file ?

Yes there is  maximums voltages of sound card input i dont know how may be 500mV mike and 5v line in ??

if you use a mic ther is often a option in volume property -> mic volume -> advanced -> uncked ampli box

you can also take away the mic or low down your sound system ?

@+

Tinnitus

[hityue]

I find the place to change the volume of the mic.If I lower the mic,does it equal to taking it away from the sound system?

And can I control that in LABVIEW?

Thank you!

[tinnitus]

hye,

yes, it seems to be possibble but i don't know how,  try to search with key words "microphone volume"

i have some difficulties to understand  what is the probleme,

is your problem solved ?, what is the aim of your application ?

@+

Tinnitus

[hityue]

My aim seems very easy.I just want to collect all the sound wave without any overflow.

I hope lowering the mic volume will help.

Thank you!

[RavensFan]

Wouldn't it make sense to just lower the volume on the speakers in the car?