A Programamble Audio Signal Visualizer with FPGAs

programmable real time audio visualizer
	Spartan6 Artix7 48kHz 96kHz 192kHz 384kHz 768kHz 1280x1024 VGA 1600x1200 DVI 1920x1080 HDMI	This project intends to realize an universal video effect device by making my graphical visualizer fully programmable. Base Hardware Units Digilent Nexys Video with Xilinx Artix 7 The Nexys Video board is used to implement a graphical visualization of the incoming digital audio stream. The board analyzes the audio data from either S/PDIF or 3MBit-UART. Mouse and keyboard control is available too. The Audio is converted to MIDI-like information using my ultrafast audio2midi transformation algorithm. Various information from up to 8 audio channels channels are extracted in order to control the parameters of the visualizer. Graphical Output residues of error functions Graphical Audio Visualizer - Altera Version First approach of real time audio visualization with NIOS The system was able to render between 10 to 20 simple frames in real time. The VGA interface with dithering is used to generate a HD-like signal of 1920x1080 resolution with a refresh rate of either 50Hz or 60Hz. Also 1600x1200 resolution is possible. The smaller format of SXVGA 1280x1024 can be run up to 120Hz. See my VGA-Core project at www.mikrocontroller.net Unlike I did it in the former version, the analysis is not performed by a FFT, but a discrete transformation of selected frequencies using optimized adjustable filters, which is more precise and reacts quicker on level changes. The audio data is thus used to create visual effects in real time. See a Youtube Video here dynamic error calculation Fractal Graphic Output $FPGA real time rendering - fractal like structures$ a fractal algorithm treated with a high pass / edge detection click here to see the former version of the visualizer