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Theremin

Theremin. William Soetanto MyDaq Musical Instrument Example ENGR 100 TA. History. Invented by a physicist Leon Theremin, and patented in 1928 Lenin was impressed with the invention and started taking lessons Featured in 1951 The Day the Earth Stood Still , 1945 The Lost Weekend.

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Theremin

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  1. Theremin William Soetanto MyDaq Musical Instrument Example ENGR 100 TA

  2. History Invented by a physicist Leon Theremin, and patented in 1928 Lenin was impressed with the invention and started taking lessons Featured in 1951 The Day the Earth Stood Still, 1945 The Lost Weekend

  3. Operation Method • Played without physical contact • Uses 2 Antennae forms the input • Pitch • Volume • Hands become ground plate for antenna • Becomes a variable capacitor • LC circuit

  4. Our Version

  5. TSL 260R LF • Light Intensity to Voltage Converter • λ=940 nm • Characteristics • VDD= 2.7–5.5 V • VOM= 3.3V at VDD=4.5V

  6. Wiring Schematics TSL 260R LF TSL 260R LF

  7. Software Design Steps • Mapping analog to system input • Human hearing range 20 -20000 Hz • Piano frequency range 16 – 5000 Hz • Amplitude range -2 to 2 V • Harmonics vs True Tone • Pure sine waveform is true tone • Musical instrument never generate true tone • Limitation • DAQ maximum sampling rate 200k Hz • DAQ audio out voltage -2 to 2 V

  8. VI Front Panel

  9. Wiring Diagram VI

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