Pitch-to-MIDI Converter Project Presentation - II By Scott Stroupe and Andrew Rogers.

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Presentation transcript:

Pitch-to-MIDI Converter Project Presentation - II By Scott Stroupe and Andrew Rogers

Project Specifications  Clock Freq: 24 MHz external oscillator  Sample Rate: kHz  Freq Range: 100 – 6000 Hz  Latency: negligible  RAM Required: none

System Block Diagram

Updated Project Description A/D conversion unchanged No longer using FFT ·Rabiner & Gold 1969 Pitch Extraction Algorithm Microcontroller ·Note calculation from pitch period data ·RS-232 serial port handles MIDI communication

Audio CODEC Interface Interface to the AK450A audio CODEC Controls sample rate and left/right channel selection Converts serial data stream from AK450A to 20-bit parallel data words

Pitch Extraction Circuit

Microcontroller Calculates MIDI note based on 8-bit pitch period data Sends MIDI controls via RS-232 port ·Note on, note off ·Note value ·Additional parameters