Reception of modulated carriers having asymmetrical sidebands
AssigneeU.S. Philips Corporation
InventorsAdrianus Sempel, Eduard F. Stikvoort, Alphons A. M. L. Bruekers, Adrianus W. M. van den Enden, Rudy J. van de Plassche, Gerardus C. M. Gielis
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Abstract
In a receiver for receiving a modulated carrier (MC) having asymmetrical sidebands (USB,LSB), for example, a TV signal, a synchronous demodulator (SDEM) derives a vectorial baseband signal (VB) from the modulated carrier (MC). A filter (FILT) filters the vectorial baseband signal so as to compensate for the sideband asymmetry, for example, by means of a Nyquist slope. Thus, the sideband asymmetry is compensated at baseband frequencies, rather than at an intermediate frequency, which allows a better quality of reception.
Claims5
A receiver for receiving a modulated carrier having asymmetrical sidebands, characterized in that the receiver comprises:
- a synchronous demodulator for deriving a vectorial baseband signal from the modulated carrier;
- and
- a filter for filtering the vectorial baseband signal to compensate for the sideband asymmetry.
A method of receiving a modulated carrier (MC) having asymmetrical sidebands, characterized in that the method comprises the steps:
- deriving a vectorial baseband signal from the modulated carrier by synchronous demodulation;
- and
- filtering the vectorial baseband signal to compensate for the sideband asymmetry.
An integrated circuit for processing a modulated carrier having asymmetrical sidebands, characterized in that the integrated circuit comprises:
- a synchronous demodulator for deriving a vectorial baseband signal from the modulated carrier;
- and
- a filter for filtering the vectorial baseband signal to compensate for the sideband asymmetry.
Dependencies are inferred from the claim text.