Audio Filter Help

[endean0]

Can anyone help please?
Does anyone have a schematic to build an audio filter that will reduce any background noise outside of 300 Hz to 3500 Hz picked up through a directional microphone?
:roll:
Thanks

 

[Optikon]

Can anyone help please?
Does anyone have a schematic to build an audio filter that will reduce any background noise outside of 300 Hz to 3500 Hz picked up through a directional microphone?
:roll:
Thanks

So you need a bandpass filter... Try google.. Example filter designs are everywhere...

 

[Russlk]

5% tolerance will work. You will want to use a less expensive op amp.

 

[chemelec]

Go to this link on my website. It is for a Shotgun or Parabolic Mic. And it includes the Filter you want.

**broken link removed**

Take care.........Gary

 

[Russlk]

I believe there is a resistor missing in the filter schematic. It is R8.

 

[audioguru]

2-pole filters are kinda droopy, aren't they.

But it will sound like an old-fashioned telephone! (New phones sound better):
Can't you hear me? I said, "telephone", not "ele own".
I told you I have six of them, not "ick uh 'em".
Un, oo ,ree ,or ,ive, ick, evven, A, ine, en! Yep, 10 fingers.

You might need a translator.

Who ever said the speech band is only from 300 to 3000 Hz? They must have been deaf and were reading lips!
Have you ever heard an underwater throat microphone? Awful sound, like TV announcers and their darn tie-clip mics that pick-up only chest vibrations, then their compressor cuts all the important sounds way down.
Why is the frequency response form the TV reporter who is "out on the street" flat down to DC? We don't need to feel the rumbling of traffic. A low cutoff at about 80Hz will be fine.