Abstract: Alpha-multiplied color data is converted into a form suitable for use in blending operations which does not generate a loss of color value precision or introduce significant color shifts into a blended object generated using the converted color data.

Abstract: Methods and apparatus for blending graphics objects. In one aspect, a method includes receiving a first graphics object; rendering the first graphics object to produce a first pixel map having a first bit depth; increasing a bit depth of a second pixel map associated with a second graphics object that is to be blended with the first graphics object, where the second bit depth is less than the first bit depth; and blending the first and second pixel maps. The method may be implemented to blend graphics objects received by a printing device. In one embodiment, the invention features blending deep pixel data received by a printing device with corresponding shallow halftoned data stored in a shallow frame buffer. The invention may be implemented as a printer configured to receive a page description language description of a page to be printed, the printer including a dehalftone engine for deriving deep pixel data values for objects stored in a shallow frame buffer.

Abstract: A base station (BS1) in a mobile radio system has connection in a first cell (1) with a mobile station (MS1) on a two-way channel (K1) having two carrier frequencies. A base station (BS2) and a mobile station (MS2) in a second cell (2) remote from the first cell are mutually connected on the channel (K1) disturbing the connection in the first cell (1) through signals (F1, R1). The combined signal strength of the disturbing (F1, R1) and the home connection (K1) is measured. The signal strength of solely the disturbing connection (F1, R1) is also measured, the carrier frequency of home connection being closed down. The quotient between these signal strengths is a measure of connection quality. The stations (MS1,BS1) may include means for closing down their respective carrier frequencies when no information is transmitted, the receiving station then measuring the disturbing signal strength.

Abstract: A base station for a cellular frequency hopping TDMA radio communication system comprises at least two transmitter groups, each containing at least one transmitter, connected to individual antennas in an antenna group of a cell. Means are included for controlled frequency hopping in at least one TDMA channel such that its signal bursts are distributed on different antennas in the antenna group.