France Telecom

Fahrenheit Thermoscope LLC

Eric Andre

Patrice Senn

A radio frequency transmitter, of the type supplied with two signals in baseband and in quadrature, I(nT) and q(nT), which are images from two binary streams representing information to be transmitted, 1) provides a first transposition into the digital domain, at an intermediate frequency &#x3c9;, for the baseband signals and generates, by combination, two signals of intermediate frequency in quadrature, 2) provides a second transposition into the analog domain, after multiplication by a frequency &#x3c9;, followed by a summation of the two signals at intermediate frequency and in quadrature, in such a way that a resultant signal is generated which is found finally around a frequency &#x3c9;, where &#x3c9;=&#x3c9;+&#x3c9;. In an advantageous variant, the radio frequency transmitter additionally digitally compensates gain and phase imperfections of the direct conversion.

Radiofrequency transmitter with a high degree of integration and possibly with self-calibrating image deletion

The invention relates to a dual mode radio frequency reception device of the type enabling the reception firstly of multi-carrier broadcast signals in a first frequency band and secondly radio positioning signals in a second frequency band, comprising a single preprocessing module (), particularly including a pass-band antenna filter () in which the pass-band includes at least the said first and second frequency bands, and outputting firstly to a first processing system () to process the said multi-carrier broadcast signals, and secondly to a second processing system () to process the said radio positioning signals.

Dual mode radio frequency reception device and corresponding multimedia receiver

A radio frequency transmitter, of the type supplied with two signals in baseband and in quadrature, I(nT) and q(nT), which are images from two binary streams representing information to be transmitted, 1) provides a first transposition into the digital domain, at an intermediate frequency &ohgr; , for the baseband signals and generates, by combination, two signals of intermediate frequency in quadrature, 2) provides a second transposition into the analog domain, after multiplication by a frequency &ohgr; , followed by a summation of the two signals at intermediate frequency and in quadrature, in such a way that a resultant signal is generated which is found finally around a frequency &ohgr; , where &ohgr; &equals;&ohgr; &plus;&ohgr; . In an advantageous variant, the radio frequency transmitter additionally digitally compensates gain and phase imperfections of the direct conversion.

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Grenoble, France

Eric Andre