Adding reame file.

README.md

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+# SpectrumAnalyzer
+
+A real-time analyzer (RTA) or spectrum analyzer converts a time-domain signal into a frequency-domain signal. In other words, it makes visible the amount of energy in the signal as a function of frequency.
+
+This project uses the Cyclone IV FPGA used in the DE2-115 evaluation board to:
+
+a) configure and interface to the audio codec
+
+b) buffer the audio samples into a FIFO
+
+c) feed the samples into an FFT
+
+d) collect the results into a dual-port RAM
+
+e) instantiate a Nios soft-core processor
+
+f) interface the RAM onto the Nios bus to read the resuslts
+
+g) FPGA also has a VGA frame buffer and creates the VGA waveform
+
+h) allows the Nios to draw pixels into the VGA frame buffer
+
+The Nios processor reads the FFT data, groups high frequency bins together to display the spectrum in log fashion, and then draws bars into the VGA frame buffer.