strange noise

Agatha Soc

Freshman
Jul 20, 2017
8
0
0
Hi, friends. there is a problem that I can,t solve. I use a lg all one with hdmi port. This is connected in a cable tv box.



well, I record my audios with a audio technica 2500 usb. with the cable tv connected (but turned off) I get the following track (thumbnail1)
but if I retire the cable tv from hdmi port, I get that (thumbnail2)

all in one is a computer, with integrated monitor (similar to imac). and the lg has the tv function too. that pictures clarify better (thumbnail 4, 5...)
 

Attachments

  • with hdmi cable.png
    with hdmi cable.png
    54.5 KB · Views: 0
  • without hdmi cable.png.jpg
    without hdmi cable.png.jpg
    102.2 KB · Views: 0
  • allinone1.jpg
    allinone1.jpg
    506.7 KB · Views: 0
  • allinone2.jpg
    allinone2.jpg
    445.3 KB · Views: 0
  • allinone3.jpg
    allinone3.jpg
    499 KB · Views: 0
  • allinone4.jpg
    allinone4.jpg
    498.9 KB · Views: 0
  • allinone5.jpg
    allinone5.jpg
    569.9 KB · Views: 0