Patent ID: 7570110

Claim:
An arrangement for demodulating a vestigial sideband signal component contained in an amplitude-modulated frequency signal, the demodulating arrangement comprising: a local oscillator; two parallel mixing stages to receive the frequency signal, wherein the two parallel mixing stages are driven by the local oscillator to operate at a phase shift of substantially 90°, of which mixing stages a first one produces from the frequency signal a first output signal and a second one produces from the frequency signal a second output signal that is phase shifted by substantially 90° relative to the first output signal; a downstream phase-shifter that causes a further phase shift between the first and second output signals from the mixing stages of substantially, a further 90° for a total phase difference of about 180° between the first output signal and the second output signal; an adder that adds together the output signals from the phase-shifter; and a setting device to receive the frequency signal prior to mixing of the frequency signal by the parallel mixing stages for setting the frequency and phase of the local oscillator substantially to the frequency and phase of the frequency signal.