It's the pump that makes the noise. What size of pump are you planning on using? How much filtration you need depends on how many fish you have in there. You don't need to buy an expensive filter system. Any large tupperware storage bin or container will do the same job. Fill with filter media, bought at a pet store or homemade (nylon bath scrubbies, pure bbq lava rock, etc. etc.) pump the water into the top and let it run through the media and out the bottom (drill a hole here). Presto! A pond filter that does the same job. Its just a container with filter media that pumps the water through. You can buy the same commercial filter media by the bag.

You'll want to transfer a little filter media from your pond filter to give the bacteria a head start. (I assume you have a bio filter for your pond?) Otherwise you'll have to let the filter run with one tiny fish for a couple of weeks before there's enough bacteria growing in it to do a good job - ditto for storebought filters. All bio filters work on the same principle. You can buy bacteria to jump start your filter but I've never done that and don't know how well it works. All it needs is a little ammonia (fish waste, pee) to get started.

You should do some research so you understand filters, bacteria, pumps, ponds in general and how they work before you buy anything or put any expensive fish in it.