H - Electricity – 03 – D
Patent
H - Electricity
03
D
350/94
H03D 1/24 (2006.01) H04B 1/30 (2006.01) H04N 5/44 (2006.01)
Patent
CA 1223063
31 ABSTRACT: A receiver for receiving a signal modulated on an RF-carrier, comprising a pair of signal paths arranged in parallel between an RF-input and a superposition circuit and including, arranged in succession, a pair of first mix- ing stages for mixing down the frequency of the received modulated RF-carrier to a low frequency, mixing signals being applied in a phase quadrature relationship to these first mixing stages from an RF-tuning oscillator, a pair of filtering elements for signal selection and a pair of second mixing stages for up-converting the frequency of the selected modulated carrier, mixing signals being applied also in a phase-quadrature relationship to these second mixing stages from a fixed LF-oscillator, these second mix- ing stages being connected to inputs of the superposition circuit, the superposition circuit comprising an adding or a subtracting stage arranged between outputs of the two signal paths and producing a first output signal. An amplitude and phase balance between the two signal paths is established by an amplitude and phase control of the signals in the two signal paths in dependence on the amplitude and phase of the image interference in the output signal of the superposition circuit. The image interference is measured according to the invention on the basis of the image inter- ference component at a predetermined reference frequency, more specifically the carrier frequency. The amplitude of this image interference component is measured by detecting the image interference component phase-synchronously, the reference frequency being the detection carrier, and the phase of this image interference component is measured by detecting the image interference component synchronously by means of a detection carrier whose phase is shifted through 90° relative to the reference frequency. The of necessity equal frequency position between the reference frequency and its image interference component is obtained by means of frequency mirror-inversion.
450845
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
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