The Canaries are away to Manchester City on Saturday on the back of a 3-0 drubbing by Manchester United at Old Trafford in the Capital One Cup.
It was a third defeat in the last four for Chris Hughton's side, who could only draw 0-0 at home to Cardiff last weekend which saw them stay in the bottom three.
"We have set high standards in the past four years. The team spirit is still very much there and it is a humble group," Martin said.
"At present the results are not quite going for us, but within that group the senior players need to make their voices heard.
"We have to make sure we have that strong identity that, in my opinion, has meant no team has worked harder than us in the past when we go out on the pitch.
"That is what we need to get back to and if we do, we have more than enough quality to improve on last year.
"We have played well in the last three league games and not got what we deserved, but by the same token there is also a time when you need to say if you are not going to get anything then be difficult to beat, like we were last year and not conceding goals.
"We have conceded too many late on and that needs to stop. We know that. You have to be physically and mentally switched on."