Patent ID: 8670582

Claim:
A signal processing device, comprising: a signal processing unit configured to process an electrical SPU-input signal including frequencies in an audible frequency range between a minimum frequency and a maximum frequency, and configured to provide a processed SPU output signal, the signal processing unit including an FM to AM transformation unit configured to transform an FM2AM input signal originating from the SPU-input signal and including at least a part of the frequency range of the SPU-input signal from a frequency modulated signal to an amplitude modulated signal, and configured to provide an FM2AM output signal, which is used in the generation of the processed SPU output signal, the FM to AM transformation unit including a frequency demodulation unit configured to extract a frequency modulation function of the FM2AM input signal and configured to provide an FM2AM transformed signal, and an AM modulator configured to perform amplitude modulation of the FM2AM input signal originating from the SPU-input signal with the FM2AM transformed signal to provide the FM2AM output signal.