Areas, allowed to overlap, are set for respective pixels in an image, and a maximum density value and a minimum density value, among inherent density values of the pixels in each area, are extracted and specified as maximum and minimum density values common to the pixels in the area. During registration of a mobile station the GANC determines a Charging Cell Global Identity and a Location Cell Global Identity, for the MS and stores the CGIs in an MS context. The modules may be realized in SAW-technology, and continuously varying tap attenuation may be achieved by the utilization of PIN-diode attenuators. The sheet member and a resistor are connected in series between a ground potential wiring and a power-supply potential wiring, and an output terminal is connected to a connection point between the sheet member and the resistor. Comparison logic performs the comparison and transmits an activation signal if the energy value for the row of energy values is greater than or equal to the activating energy level for the corresponding pulse positions. In one aspect, a method includes receiving an audio signal that corresponds to an utterance recorded by a mobile device, determining a geographic location associated with the mobile device, adapting one or more acoustic models for the geographic location, and performing speech recognition on the audio signal using the one or more acoustic models model that are adapted for the geographic location.