What makes you unheard is the hard part. That isn't defined in rules and that would determine how I ruled it. The group I DM for stays close together and is more a kick down the doors and be loud and boisterous at the tavern group. Not a stealth and deception group. Invisible paladin in heavy armor they probably hear you. A monk and a rogue if you dash they probably hear you. Half speed they don't regular speed maybe an acrobatics check vs their passive perception.
Cool. Lets leave the house rules out though so we dont confuse people, and stick with the Rules as written re Hiding.