Abstract: A mobile device for receiving supplementary information transmitted with a radio station signal, said mobile device comprising: means for scanning a spectrum of frequencies; means for detecting a plurality of radio stations broadcast within said spectrum of frequencies; means for decoding, for each of a plurality of detected radio stations, at least one piece of supplementary information broadcast in conjunction with the plurality of radio stations; means for inputting a search criterion; means for generating a set of radio stations whose supplementary information matches said search criterion; and means for selecting one of the set of radio stations whose supplementary information matches said search criterion.

Abstract: A mobile device for receiving supplementary information transmitted with a radio station signal, said mobile device comprising: means for scanning a spectrum of frequencies; means for detecting a plurality of radio stations broadcast within said spectrum of frequencies; means for decoding, for each of a plurality of detected radio stations, at least one piece of supplementary information broadcast in conjunction with the plurality of radio stations; means for inputting a search criterion; means for generating a set of radio stations whose supplementary information matches said search criterion; and means for selecting one of the set of radio stations whose supplementary information matches said search criterion.

Abstract: An automatic gain control circuit is used to vary the gain of a low noise amplifier and baseband amplifiers in a direct conversion receiver in a mobile telephone handset. The automatic gain control circuit is configured to cause a power level (57) of a signal supplied to an analog-to-digital converter having a signal-to-noise ratio of 33 dB to converge on a reference level (49) using a two-stage process.