Image rejection
AssigneeKoninklijke Philips Electronics N.V.
InventorKaveh Kianush
Life of this patent
Estimating the term…
Abstract
Radio receivers are known in the art. A conventional receiver requires external components for RF/image selectivity, IF selectivity and demodulation. Other solutions are for example a number of correction algorithms, which is an expensive solution. The receiver according to the invention obtains a better rejection without the need of expensive algorithms.
Claims4
Receiver comprising an input for receiving an antenna signal, an output for supplying an audio signal, first and second mixing means for mixing the antenna signal with a first and second oscillation signal to obtain an in-phase and quadrature signal, filter means for filtering the in-phase and quadrature signal, demodulation means for demodulating the filtered quadrature signals and an oscillator for supplying the first and second oscillation signal to the first and second mixing means, characterized in that the receiver comprises measuring means for measuring a level of disturbance at a first and second predetermined frequency distance from the chosen frequency, comparing means for comparing the measured first and second level of disturbance, choosing means for choosing the frequency band with the lowest level of disturbance, and a control means for controlling the oscillator.
Method for tuning a tuner to a predetermined frequency having a first and second measuring of a level of disturbance at the first and second predetermined frequency distance of the chosen frequency, a comparison of the first and second level of disturbance and a choosing of the frequency band with the lowest level of disturbance and a tuning of the receiver to the chosen frequency band.
Dependencies are inferred from the claim text.