Bernard, hope that you'll be able to participate more often now. There's no question that, as you say, the required bandwidth for transmission of 720p and 1080i are similar. Although the full 1080 frame contains over twice the pixels than does the 720 frame, 1080i is transmitted in two separate fields in sequence, so its transmission doesn't per unit of time require over twice the bandwidth, as would be required if all the pixels were transmitted simultaneously.

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Enjoy the music, not the equipment.