Intensity modulated display system

A system for displaying a continuously variable analog input signal having variations of three independent parameters, comprising:

• (a) input means for receiving said input signal to be displayed;
• (b) display means coupled to said input means for displaying said input signal as a final signal upon a two-dimensional surface having a pair of mutually orthogonal parameter axes, a first one of said axes corresponding to an entire range of allowable values of a first one of said parameters and the remaining one of said axes having a range corresponding to a submultiple of the total allowable value range of another parameter;
• (c) first means responsive to said input signal for providing a quantized signal having one of a multiplicity of discrete levels including a zero level, said quantized signal being provided at said zero level when said input signal has an amplitude between zero and a lowest one of said multiples of the total range of said another parameter, said quantized signal having sequentially greater discrete amplitudes of said multiplicity of levels of said another parameter for said input signal exceeding sequentially greater multiples of said total range submultiple;
• (d) second means for providing a difference signal proportional to the difference between said input signal and said quantized signal;
• (e) local signal generating means for providing a periodically varying comparative signal, each period of said comparative signal being associated with substantially a single value of said first parameter and
• (f) comparator means for generating an additional signal whenever said difference signal exceeds said comparative signal;
• (g) third means for applying said additional signal to said display means to vary the intensity thereof to cause those areas of the displayed final signal that correspond to portions of said another parameter of said input signal exceeding successively greater ones of the multiplicity of levels of said quantized signal to have successively greater intensities for each value of said first parameter;
• and
• (h) fourth means for applying another signal to said display means to cause the boundary between successive portions of said display having different intensities to be formed as a curve in accordance with the amplitude of said another parameter of said input signal relative to said quantized signal level to indicate the incremental value of said another parameter of said input signal relative to the general level thereof;
• (i) one of a succession of said two-dimensional surfaces being generated in a sequential manner for each sequential value of a remaining one of said three parameters to display the variation thereof in accordance with the variation in the first and another parameters.