Piano And Key Robots 3
Josh also build the keys himself. Whoho!
The operational principle is that when stepper motors are back-driven, they induce a pseudo-sinusoidal alternating current. If this signal is amplified and connected to a speaker, you can listen to it as sound. The pitch of the sound is determined by the frequency of the wave, which depends on how fast the motor is back-driven. Higher speed will be a higher note. I thought this sound was interesting, so I wanted to make an instrument that used this mechanism to make music. This is an experimental instrument I built that uses back-driven stepper motors to synthesize sound.There are 49 stepper motors, one for each note in my four octave instrument. At rest, each motor floats above one of 49 disks, which increase in size exponentially as the notes ascend in pitch. The disks spin together, driven by a single speed-controlled DC motor. When a key is pressed, the corresponding stepper motor is engaged with the corresponding disk in the disk stack, and the disk back-drives the stepper motor.
Wooden Organ Built Around Stepper Motors to Create a Unique Synthesized Sound
Ok we confess – this is not an actuall robot but an innovative way of triggering a piano. Andrew McPherson from Drexel university created this new instrument. It uses coils to move the strings of an existing piano and thus creating alien-like sounds.
The magnetic resonator piano is a hybrid acoustic-electronic instrument which uses electromagnets to augment a grand piano. This instrument expands the piano’s vocabulary to include infinite sustain, crescendos from silence, harmonics, and new timbres.
Made first public at the world expibition fair in 1876 and invented by Forneaux, the pianola or player piano is an automatic version of a normal piano. It uses paper rolls with imprinted notes to play the piece. The pianola was advertised which resulted in peak sales in 1920s. With the invention of the phongraf and other recording equipment sales droped. Now, rthe only available self-playing piano is the Yamaha Disklavier.