A realtime Audio to MIDI converter in VHDL

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advanced audio recording

Audio to MIDI converter with FPGA in VHDL
	Audio 2 MIDI 48kHz	An audio to MIDI - Converter Design Block Diagram This design in VHDL for PLDs and FPGAs converts one channel of audio data in real time into MIDI-like tone information using MIDI2000 protocol to fit well into the Audio-DSP-Workstation. By analyzing the incoming audio stream with a small DFT-like algorithm, the dominating frequency is detected by ignoring any harmonics. The corresponding MIDI tone number is discovered using a frequency table. Deviation of the given note's frequency is detected too and transmitted as a vibrato controller code. Also some others MIDI-CTRL commands are derived from the audio like attack, decay, sustain and release in order to be able to record them for later use. This design is based on an idea, formerly realized for DSP-Systems in C-language and had been changed to VHDL for a modern Spartan 2 FPGA. Data Entry has been done using VHDL Studio. See the former article for more details.

	48 kHz Audio DSP