Problems with connecting speakers to my TV. (High-pitched ringing)

[DeFruba_Dude]

So lately I have been trying to connect a pair of speakers into my TV so I can get that full sound feeling. My speakers are CA 2.1 computer speakers and are powere and my TV is a 32 in. Vizio with only optical audio output and red/white audio output (can't recall name at the moment).
So, to connect the speakers, I have been using a 3.5mm to red/white converter. I get sound from the TV to the speakers, but with another sound. There's this continuous, high-pitched ringing from the speakers and is always at the same volume no matter how I change the volume on the tv. And the sound only comes when the speakers plug into the TV, nowhere else.
Does somebody have a solution to stop this ringing sound, or should I purchase non-computer speakers to plug into my TV?

 

[americanaudiophile]

Sounds like you have a ground loop.
https/www.amazon.com/s/?ie=UTF8&keywords=audio+ground+loop+isolator&tag=googhydr-20&index=electronics&hvadid=177159000379&hvpos=1t1&hvnetw=g&hvrand=16926143914611075900&hvpone=&hvptwo=&hvqmt=e&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9004455&hvtargid=kwd-1816637978&ref=pd_sl_1n0vpe1k3x_e
More info here
http/web.mit.edu/~jhawk/tmp/p/EST016_Ground_Loops_handout.pdf
In the past I have found that some cable systems introduce constant noise even if you are using a different source on the TV. There are isolators for the cable line too.