DIGITAL FILTER AND LISTENING DEVICE

摘要

The invention concerns a digital filter. The filter comprises at least a first and a second 5 delayed summation line, whereby one of the delay lines comprise a warped filter FIR filter and the other line is a FIR filter, whereby: at least two delayed summation lines are present, midpoint elements from the first delayed summation line are used as input to the second delayed summation line, output from the first delayed summation line is delayed with a delay corresponding to the total delay of the second delayed summation line, the delayed output from the first delayed summation line is added to output from the second delayed summation line to form a new output.