Sounds
In most implementations, a digital piano produces a variety of piano timbres and usually other sounds as well. For example, a digital piano may have settings for a concert grand piano, an upright piano, a tack piano, and various electric pianos such as the Fender Rhodes and Wurlitzer. Some digital pianos incorporate other basic "synthesizer" sounds such as string ensemble, for example, and offer settings to combine them with piano.
The sounds produced by a digital piano are samples stored in ROM. The samples stored in digital pianos are usually of very high quality and made using world class pianos, expensive microphones, and high-quality preamps in a professional recording studio.
Digital pianos do have limitations on the faithfulness with which they reproduce the sound of an acoustic piano. These include the lack of implementation of harmonic tones that result when certain combinations of notes are sounded, limited polyphony, and a lack of natural reverberation when the instrument is played percussively. They often lack the incidental acoustic noises associated with piano playing, such as the sounds of pedals being depressed and the associated machinery shifting within the piano, which some actually consider a benefit. These limitations apply to most acoustic instruments and their sampled counterparts, the difference often being described as "visceral".
On an acoustic piano, the sustain pedal lifts the dampers for all strings, allowing them to resonate naturally with the notes played. Digital pianos all have a similar pedal switch to hold notes in suspension, but only some can reproduce the resonating effect.
Many digital pianos include an amplifier and loudspeakers so that no additional equipment is required to play the instrument. Some do not. Most digital pianos incorporate headphone output.
Read more about this topic: Digital Piano
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