Patent ID: 7212466

Claim:
A method of producing an amplitude value for use in controlling illumination of a pixel on a display, in response to a sampled sonar signal produced by an element of a sonar array, the method comprising: finding a pixel time associated with said pixel, said pixel time representing a time required for sound to travel a distance represented by said pixel, according to a range of distance to be viewed on said display; finding a sample point of the sampled sonar signal, having a sample time nearest said pixel time; finding a delay value associated with said pixel, said delay value including an array element delay value; producing a representation of a synthesized waveform, in response to said sonar signal, said representation comprising a plurality of sample points coinciding in time with the sample points of said sonar signal; producing an amplitude value representing an amplitude of said synthesized waveform at a time corresponding to said pixel time by finding an amplitude value of said waveform at a time value corresponding to the sum of said sample time and said delay value; and making said amplitude value available for use in illuminating said pixel.