Need helps for level meter of sound.

[cheolim]

Hi, all.

Who have the idea or experience for the sound level meter
with microcontroller?
I'd like to use the microphone to detect the sound level like a music.
Please let me know your advices.

If possible, please let me know how can I remove the noise sound
other than the music like the situation when I drive the car.

Thank Q for your attentions in advance.
:roll:

 

[barrybear]

I believe you mean , how can you reduce the background noise from you automobile when you are lisening to your in car stereo.

Some work has been done to reduce background noise by monitering the sound and feeding it in to your stereo with a 180 phase reversal . I think BMW have tried this and first experiments have proved quite succesfull.
Fairly easy to try anyway.

Barrybear

 

[sc/mp]

Hi

Without a microcontroller LM3915 does the job !

--> www.national.com/pf/LM/LM3915.html

Don't miss AN-386 at the bottom of the same page !

Regards

 

[bobcat1]

search for the NE604 chip from philips

search for the NE604 chip from philips thay have application not for
sound level meter




bobi