Patent ID: 7717228

Claim:
A sound absorbing element comprising: a first wall area; a second wall area; and a plurality of spring elements; wherein the first wall area and the second wall area are arranged so as to be spaced apart from each other by a clear space, in which clear space the plurality of spring elements being arranged in the clear space, the plurality of spring elements connecting the first wall area and the second wall area to each other, and wherein each of the plurality of spring elements is pre-tensioned for decoupling the first wall area from the second wall area; and a negative pressure is applied to the clear space, as a result of which pressure, the plurality of spring elements are pre-tensioned, wherein each of the plurality of spring elements has a spring function within at least one region in which a slope approaches zero, wherein the plurality of spring elements are pre-tensioned up to a region in which the value of the slope is less than 5% of the maximum value of the slope in an entire region of the spring function.