VGA / DVI
Base Hardware Unit
Altera Cyclone IV + ADC/DAC board
The Altera Cyclone 4 DE2-115
from Terasic is used to implement a graphical visualization
of incoming audio. The board is attached to both a stereo
audio codec chip and high speed ADCs and DACs which are used for
signal observation during development process e.g.
monitoring signal at a physical oscilloscope. The analog
audio is down sampled to 384 kHz for highest precision.
interface is used to generate a HD-compatible signal of
1920x1080 resolution with 60Hz refresh rate. See the VGA
Core Project on www.mikrocontroller.net
1920x1080x60 video format showing the visualization of
the keyboard input.
The audio analysis is performed by the
audio2midi-unit of the
FPGA-DSP. A Görtzel-algorithm is used to analyze the audio.
Simultaneously it is monitored at an analog oscilloscope via
the built in DACs. Audio data rates of up to 384 kHz are
click here to see the also
the graphic equalizer