Sound from other people absorbs the sound waves.Walls and ground reflect othersound waves to make them moreheard in the large open space. Table absorb sound waves. In the canteen the sound waves are absorbed by ambient sounds during the recording such as other people speaking and chairs being moved about. Outside it was very clear to hear because there were no other sounds to absorb the sound waves and outside it had no roof or other objects to reflect the other sounds whereas in the canteen other sounds make it hard to hear speech. This makes speech low pitch and therefore hard to hear the recording.