SkyCable does not output Dolby Digital signals. Even though the cable box has an option to output DD, its output is only 2-channel 9stereo) LPCM. It has been one of the drawbacks of SkyCable HD ever since. Di ko lang alam kung ganoon din sa Cignal HD. Sayang kasi meron talagang channels like Fox na DD supposedly ang output pero stereo lang ang bigay ng SkyCable. I think they're trying to conserve bandwidth.