Lampard remains upbeat despite suffering back-to-back defeats in the Sky Bet Championship.
The Rams host Ipswich on Tuesday having lost 2-1 to Millwall on Saturday, with the conceded goals having come early in the first half.
Chelsea icon Lampard said, "I'm positive, we have nine new players, plus two players back from loan. We are changing the style and the way we do things behind the scenes - that's what the manager's job is.
"I understand it'll take time but I'm seeing loads of good signs.
"We were disappointed with how we played and the result in the first home game (Leeds). We want to win in front of our home fans and have two opportunities to do that (they also host Preston on Saturday).
"With the competitive nature of the Championship, it's very hard to look through and call what the results will be. It'll come down to what we do. If we play how we can we will be very strong."