An interpolation circuit for interpolating a first and a second microphone signal and for generating an interpolated microphone signal, comprising - a first input for receiving the first microphone signal (a m), - a second input for receiving the second microphone signal (a m+1), - an output for outputting the interpolated microphone signal (s), - a first circuit branch having first and second inputs coupled to the first and second inputs, respectively, of the interpolation circuit, and an output coupled to the output of the interpolation circuit, the first circuit branch being provided with a means for power-specific summation of the signals supplied at the first and second inputs of the first circuit branch and for outputting a power-specific summation signal at the output of the first circuit branch, - a control input for receiving a control signal (r), - a second circuit branch having a first and a second input coupled to the first and second inputs, respectively, of the interpolation circuit, and an output coupled to the output of the interpolation circuit, in that the outputs (107, 112) of the first and second circuit branches (104,109) are coupled to respective inputs (115, 118) of a signal combination circuit and an output of the signal combination circuit is coupled to the output of the interpolation circuit, - wherein the second circuit branch is provided with a first multiplication circuit and a second multiplication circuit having inputs coupled to the first and second input of the second circuit branch, respectively, and outputs coupled to respective inputs of a second signal combination circuit whose output is coupled to the output of the second circuit branch, - the first and second multiplication circuits (120, 121) are provided with a control input coupled to the control input of the interpolation circuit and are adapted to multiply the signals supplied to them by respective first and second multiplication quantities (1-f, f), said first and second multiplication quantities being dependent on the control signal (r), characterized in that the first circuit branch is further provided with a fifth multiplication circuit coupled between the first input of the first circuit branch and a first input of the means for power-specific summation, and a sixth multiplication circuit coupled between the second input of the first circuit branch and a second input of the means for power-specific summation, and characterized in that the fifth multiplication circuit is adapted to multiply the signal at its input by a multiplication factor equal to (1-g) 1/2, and the sixth multiplication circuit is adapted to multiply the signal at its input by a multiplication factor equal to g 1/2. - a first input for receiving the first microphone signal (a m), - a second input for receiving the second microphone signal (a m+1), - an output for outputting the interpolated microphone signal (s), - a first circuit branch having first and second inputs coupled to the first and second inputs, respectively, of the interpolation circuit, and an output coupled to the output of the interpolation circuit, the first circuit branch being provided with a means for power-specific summation of the signals supplied at the first and second inputs of the first circuit branch and for outputting a power-specific summation signal at the output of the first circuit branch, - a control input for receiving a control signal (r), - a second circuit branch having a first and a second input coupled to the first and second inputs, respectively, of the interpolation circuit, and an output coupled to the output of the interpolation circuit, in that the outputs (107, 112) of the first and second circuit branches (104,109) are coupled to respective inputs (115, 118) of a signal combination circuit and an output of the signal combination circuit is coupled to the output of the interpolation circuit, - wherein the second circuit branch is provided with a first multiplication circuit and a second multiplication circuit having inputs coupled to the first and second input of the second circuit branch, respectively, and outputs coupled to respective inputs of a second signal combination circuit whose output is coupled to the output of the second circuit branch, - the first and second multiplication circuits (120, 121) are provided with a control input coupled to the control input of the interpolation circuit and are adapted to multiply the signals supplied to them by respective first and second multiplication quantities (1-f, f), said first and second multiplication quantities being dependent on the control signal (r), characterized in that the first circuit branch is further provided with a fifth multiplication circuit coupled between the first input of the first circuit branch and a first input of the means for power-specific summation, and a sixth multiplication circuit coupled between the second input of the first circuit branch and a second input of the means for power-specific summation, and