the audio of a DVD (a piano performance) that I produced is good on computer headphones and also on audio-monitors (through external audio-card), but when I play the DVD on a lcd-tv with its poor 2*10W-integrated-speakers (reading the dvd with a standalone dvd player) I hear an added noise. This noise arrives only when the piano plays some precise notes: it seems to me more or less F3 (349 Hz), G3 (392 Hz), F4 (698 Hz), G4 (784 Hz). The noise is not big, but when it arrives it sounds like something frying...
Coming back to my computer the noise disappears on those notes, but I finally notice that they sound with an "elastic" intonation... a bit like tuning, a slow adjusting the pitch of those notes.
The "story" of this audio-track: I recorded the audio in 44.1 kHz with NTSC timecode (29,97fps). I resampled the whole original media in 48 kHz and then I changed its speed to convert it into PAL timecode (25fps) with Apple Soundtrack Pro. I did all this to edit the audio in sync with separated PAL HD footage in FinalCutPro. I did the audio edit in FCP (to maintein the sync with the video clips edits). Then I exported the result as "separate channel" into Apple Soundtrack Pro to refine EQ and reverbs.
A friend says that probably it is a problem of aliasing.
Is it so? Or could be something different?
What is your advice?
Please help me soon.