Abstract: A device providing summarized information from the digital spectrum analyzer output within a Doppler radar. Four memories, each of 256 word capacity, are included. Each of said memories is addressed by a group of eight bits among the sixteen bits provided by the spectrum analyzer and a logic circuit reconstitutes an elementary summary plot from the contents of said four memories. For a sixteen-line spectrum analyzer it is thus possible to replace a read-only memory for 64K, seven-bit words by the aforementioned four such read-only memories each of 256, seven-bit words.