U.S. Philips Corporation

Rudy J Van Der Plassche

Gerardus C Gielis

Receiver having an A/D converter for digitally sampling an analog signal modulated on a carrier frequency at a first sampling frequency, consecutively coupled to a digital quadrature mixer stage for a carrier frequency shift of the digitized modulated signal from the A/D converter, a digital filter device for selecting the phase quadrature signals of the quadrature mixer stage and for decimating the sampling frequency from the first sampling frequency to a second sampling frequency, and a digital demodulation device. To obtain a receiver which can be easily realized in an integrated form and for which less crystal surface is required than for the digital integrable receivers hitherto known, and which is particularly suitable for receiving RF radio or TV broadcast signals, the digital quadrature mixer stage includes comprises a first coordinate rotation digital computer (Cordic) in the rotation mode, having at least a first signal input which is coupled to an output of the A/D converter and a phase signal input to which a periodical digital sawtooth-shaped phase signal is applied from a digital sawtooth generator for a periodical 2.pi. phase rotation of at least the signal applied to the computer via the first signal input at a repetition frequency which is equal to the magnitude of the carrier frequency shift.

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Eindhoven, Netherlands

Rudy J Van Der Plassche