How do pianos work and make sound

how pianos work

How Pianos work: While it is not necessary to know how piano works, it will definitely give you a better understanding of your piano.

Why You Need to Know?

Knowing how pianos work may come in handy if, in case, anything goes wrong with your piano. It will help you to determine what needs to be fixed. It will also help you to examine a used Piano, if at all you have to do it for somebody.

So go ahead, press a key and check how the various parts inside a piano move. Lift the lid and see how piano works!

How Pianos Work Diagram

How Pianos Work Diagram

Highlights: How a Piano Produces Sound

How Pianos Work

  • The piano is like a huge frame which is shaped like the (grand) piano. It has a soundboard, which is sort of the bottom of the piano. The soundboard is like the back of the cello or the back of the violin or bass, and provides resonance. Without a soundboard, the sound won’t go anywhere.
  • A piano has close to 230 strings, and it’s these strings which produce the sound. When you push down a piano key, a hammer is pressed against one of those strings to produce a sound.
  • The key of the piano works like a lever, it pushes a whole bunch of little pieces (that are connected to a little hammer) to produce the sound. When you press the key, all those things start to move, the roller rolls the hammer up, which strikes the string, and the damper gets lifted up. When you release the piano key, the sound stops (the hammers rest against dampers).
  • Science students may probably already know about this – the length of the strings makes the pitch sound higher or lower. Shorter and thinner strings produce higher pitched notes (the ones on the right side of the keyboard). The longer and thicker strings producer heavy (bassy) tones, these are located on the left side of the keyboard.

Main Components / Parts of Piano

Generally speaking, any acoustic piano will have the following main components which work together to produce a sound.

  • Strings
    Each key on a piano has one, two or three strings which are made of metals. The sound in a Piano is produced by a mechanism in which hammers strike these strings. Keys that produce lower sounds i.e. keys in the lower octaves have fewer strings and the strings are longer and thicker. The keys on the higher octaves, that produce higher sounds, have more strings and those strings are shorter and thinner.

  • Cast-Iron frame
    This frame holds all the strings together and provides the required tension in all the strings. These frames are very strong, especially in the case of grand pianos, since the strings are parallel to the ground. These strong frames also ensure that the strings stay in tune for a longer period of time.

  • Dampers
    Their function is to stop the strings from vibrating. Dampers are usually made of wood and the part of the damper that rests on the strings is covered with felt. In the normal position, dampers rests on the strings but when you press a key, the damper for that key lifts off allowing the strings to vibrate and produce sound. When you release the key the damper again sits on the strings and stops the stings from vibrating.

    How Pianos Work Diagram

  • Hammers
    Every key on a Piano is connected to a hammer and that is what strikes the strings when you press a key. The strings in turn vibrate to produce a sound. The hammers are usually made of wood.

  • Action
    This is actually not one component and it refers to the feel of the mechanism that sets of inside a piano when you press a key. It consists of all the moving parts that work together to produce a sound. The heavier the action, the heavier the keys and the more force you need to apply to press the keys.

  • Soundboard

    This is one of the most important parts of a Piano. The soundboard is a large piece of wood that amplifies the sound produced. On a grand piano, it is the piece of wood that sits at the bottom of the piano and on an upright piano it is at the back of the piano.

    Damage to the soundboard will adversely affect the sound produced and can be very expensive to fix.

  • Frame: Supports the Piano Strings
  • Strings: Produces the sound. Treble strings are thinner. Bass strings are thicker
  • Pinblock: Embedded in holes in the pinblock are steel tuning pins, around each of which is coiled one end of a piano string
  • Hammers: These Hammers striking the string produces sound
  • Soundboard: Amplifies the sound generated by the vibrating String
  • Its Different On Digital Piano Keyboards

    A digital keyboard instrument runs on electricity; its more like a computer with several chips inside that not only stores the various sounds, but also processes whatever keys you press and displays it on the lcd display. So it’s more like a mini computer, but an inexpensive one.

    Digital Means Samples! That’s correct; digital keyboard instruments use samples (sound recordings) of various acoustic pianos, and those samples are stored in a chip on the digital piano. The chip then produces the various sounds on the digital piano.

    In a digital one, the sound producing mechanism is digitized. Recordings of the sounds in various situations such as when the keys are played harder or softer, is recorded and is used whenever required.

    There is a sound bank that not only stores the sounds for each and every key and octave, it also stores how it should sound depending on what pressure / velocity is applied to the keys. These are sounds that are captured during real recording sessions involving a traditional piano. A sensor beneath the keys then captures your finger movements, the pressure you have applied and so on, and the digital piano then plays a matching sound from the sound bank.

    The keys on digital piano keyboard also have weights attached, so that it mimics the action of real piano keys. Keyboard instruments can come with several numbers of keys and with various action, but when it it comes to piano keyboards, one would expect it to have more than 61 keys, and weighted, preferably with graded hammer like action.

    A digital piano, on the other hand, works a bit differently from acoustic pianos (though the key & hammer mechanism could be similar to get a real piano like feel), the sounds are generated digitally (recorded samples).

    An electric keyboard (synthesizer) come with Tone Generators & Oscillators that can produce a variety of sounds. Synthesizers allow you a lot more control over the sound, and also have an arpeggio generating feature. Such tones are usually created using oscillators. So you would basically have a combination of samples and/or oscillators to generate the sounds. That is how an electronic piano works and produces sounds.

    Electric Keyboard: How Does it Work?

    Knowing how piano works may not be necessary but it has its own benefits. I hope the description above gives you a clear picture of how piano works.

Leave a Reply

Your email address will not be published. Required fields are marked *

© 2018. All rights reserved.