The result gives Spurs nine points from their first four Premier League games, an improvement on their tally of five at the same stage last season, when they went on to finish just one point outside of the Champions League qualification places.
Hughton made eight signings during the transfer window, but it was one of his old club's new recruits who had a telling influence in the opening period.
signed from Ajax for £11.5m,
went straight into the starting line-up, unlike forward Erik Lamela, who was among the substitutes once again.
His impact was almost instant as a weaving run ended in a shot which Ruddy parried and Roberto Soldado back-heeled against the post from close range.
John MotsonBBC Match of the Day commentator
"Tottenham fans will be very pleased but shouldn't get too carried away as Norwich were very poor by their standards. It should have been more than 2-0 and I don't think we'll know the full story about Tottenham until these new players settle. Eriksen was very good, but there's a lot of juggling for AVB to do before we know what Tottenham are capable of."
Playing behind the Spanish striker in a 4-2-3-1 formation, Eriksen continued to find space and on 28 minutes weighted a pass into the path of Sigurdsson, who calmly netted Spurs' first league goal from open play this season.
Norwich responded with their only meaningful attempt of the first half, with Ricky van Wolfswinkel firing wide from 10 yards after a Nathan Redmond cross.
But four minutes into the second half their deficit was doubled.
Eriksen was again prominent, sliding a pass wide to Paulinho, whose cross evaded Ruddy and left Sigurdsson with little to do.
The former Swansea player was denied a hat-trick when Ruddy palmed wide a stinging effort from 30 yards and the goalkeeper then blocked a Townsend strike from inside the box as Norwich offered little threat.
Sigurdsson's hopes of a hat-trick ended when Sandro replaced him, with Eriksen also departing to a standing ovation on 71 minutes.
As the pace of the play dropped, Lamela, signed from Roma, came off the bench to make his home debut.
And when Van Wolfswinkel had a sight of goal blocked in the late stages, Spurs' sixth consecutive home league win was assured.
Tottenham manager Andre Villas-Boas:
"Sigurdsson is a big fighter in this squad, always hoping for his opportunity to arrive.
'No complaints' from Norwich boss
"When it does arrive, he puts on performances like this. It was the same for him last season, in February and March. We saw his best level today.
"Eriksen already has so much experience from Ajax, he really linked the game well for us in the final third today. It's easy for him to find his passes when his quality is so good.
"The second goal early in the second half gave us immense tranquillity. I think we played really well, and created great moments of football."
Norwich City manager Chris Hughton:
"It was a real tough day for us. We came up against a Tottenham side with the quality they've got. Not only on the pitch but the choices they've got off the bench as well.
"We tried to stay in the game and up the energy in the second-half which I think we did but in the first half, it was tough for us with the movement they've got."
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.