Video Asylum

Posted by jee (i) on February 02, 2001 at 12:50:36:

In Reply to: Philips sell duff products and offer very poor service. posted by azazel on February 01, 2001 at 18:01:27:

I think you may have a situation in which you are right and the engineers are right also.

Most traditional TVs have a tube ring (coming fron the CRT tube itself) at just above 15KHz (in US). It turns out that this is just beyond the limits of what most people can hear. However, you and your family must be part of the other group of people (and myself included) who can clearly hear that annoying 15Khz ring.

I assume that your wide screen TV is a DTV with progressive scanning. Most progressive scan TVs will actually produce the same tube ring, but at just above 30KHz instead. This frequency is beyond any human hearning, even those like you and me. However, I suppose it is entirely possible that the 30KHz ring is so strong that it is setting of sympathetic ringing at the sub-harmonic frequency of 15KHz causing the audible ringing, again audible to you, but not to the engineers.

Just a thought.