A receive signal processor jointly detects a signal-of-interest with one or more other signals. Scalable video decoding techniques can include setting a state variable for a block to a run length if the state variable for the current block is zero otherwise decrementing the state variable if it is not zero. The transport belt may be positioned below the print head. A preferred configuration places projector barrel and sample in fixed positions inside the sputtering chamber and places a ring of targets around the barrel, each aimed at the sample, with two or more targets of a given kind symmetrically positioned in the ring.