some word u may know... Inaudiable... And more... LOL

Antenna - Television receiver

Inaudible
The invention further relates to the art of inaudible communication, whereby the information contained in the signals is secure and undetectable by radio frequency monitoring.

su·per·im·pose

  (so͞o′pər-ĭm-pōz′)

tr.v. su·per·im·posed, su·per·im·pos·ing, su·per·im·pos·es

1. To lay or place (something) on or over something else.

2. To add as a distinct feature, element, or quality: superimposed her own interpretation when she retold the story.

I know
 Richard Svanberg