1. An apparatus, comprising: an image signal processor having a plurality of depth calculation units to calculate a respective time of flight depth value for different pixel array locations, each of the plurality of depth calculation units to receive a response signal from a same pixel in a pixel array so that said plurality of depth calculation units are able to calculate multiple depth values for said different locations of said pixel array from respective response signals from different groups of pixels in said pixel array of which said pixel is a member, each of said groups including pixels of different receive clock phases sufficient to calculate a respective depth value.