position dependent basis see control signals 60 92 the influencing of the frequency responses by the filter units f 1 to f 4 is explained in more detail below with reference to fig6 to 8 for the upright position of the telephone 10 in other exemplary embodiments with influencing of the frequency responses the filter units f 1 to f 4 can also be disposed at a different point in the voice module 50 for example as circuit elements upstream or downstream of the output amplifier 68 or the input amplifier 82 fig3 shows in a coordinate system ks 1 three frequency curves 114 116 and 118 for three positions of the telephone 10 in this case the frequency curves 114 116 and 118 were recorded by way of sound signals output by the loudspeaker 72 when passing through a spectrum from 200 hertz to 4 kilohertz for example by a swept sinusoidal signal the coordinate system ks 1 has an x axis 110 on which the frequencies are represented logarithmically in the frequency range from 200 hertz to approx 4 kilohertz the acoustic level is represented on a y axis 112 in particular in a range from 0 db pascal volt to u2212 40 db the curve 114 relates to.