www.96kHz.org
advanced audio recording
audio visualizer with Cyclone 4
  Cyclone IV


48kHz
96kHz
192kHz
384kHz

sample rates



1280x1024
VGA

1600x1200
VGA / DVI

1920x1080



48kHz
96kHz 192kHz
384kHz

Audio DSP

Base Hardware Unit

Altera Cyclone IV + ADC/DAC board

Altera DE-155 board für audio dsp workstation with 16384 voices

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.

The VGA 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


Graphical Visualization


FPGA based Real Piano with Cyclone FOGA

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 accepted!

click here to see the also the graphic equalizer



 

 

© Dipl.-Ing. Jürgen Schuhmacher 2011