How Is The Piano Sound Generated

In today’s article, we will briefly analyze how piano sound is generated and amplified. That is to say how is the whole process how in a grand piano it vibrates a string. And how that vibration transmits and amplified to the harmonic table. That is precisely in charge of amplifying the sound.

We can see a lateral scheme of a grand piano where we have its most important parts:

  • the pegbox
  • the peg
  • the harmonic table
  • the tonal bridge
  • the back of the piano
  • and a string along its entire length

In our article, we have analyzed the primary useful length, duplex scales, and their function.

In the first place, it is important to point out. That it always carries the hammer on the string out in a segment. Close to the front or nearest part of the pegbox of the primary useful length. In both an upright and a grand piano, it places the hammers in such a way. That they strike the string in an area close to the front or top of the piano.

Demonstration Of Piano Harmonic Table Vibration

Once the string has set to vibrate. Then the energy that the hammer received through the keyboard transmits to the string. The string transmits its vibration over its entire length. It also stimulates the vibration of the duplex scales which as already mentioned in another article. Reinforce some of the weakest harmonics or partial harmonics of the primary useful length.

When arriving at the tonal bridge we can notice that we firmly support the rope on this one and lightly pressed with two nails through which the rope passes making a kind of zigzag. The function of these nails is to keep the string firm on the tonal bridge along this route. It is precisely the tonal bridge that acts as an intermediary between the string and the harmonic board. And it’s the latter that will amplify the sound of the string.

The Piano Harmonic Table

The harmonic table is like a big membrane, it is not flat (although in the video’s scheme is only for didactic purposes), it has a lenticular form that it is thinner in the ends and in the center it has a bigger thickness. The function of the harmonic table is very similar to the membrane of a loudspeaker since when receiving stimuli it can amplify the sound originally produced by the string. To do this the harmonic table has perfectly attached on it to the tonal bridges. We screw these bridges to the back of the harmonic board, with a grand piano, and to the bottom in upright pianos. It has in the upper part, where are the clavitos of the tonal bridge, passing in zig-zag form to all the strings.

It is the route that makes the vibration of the rope and that comprises hitting the hammer on the primary useful length of the rope it begins to vibrate and this energy passes to the tonal bridge and this one transmits it to all the harmonic table. What this table does is to amplify the sound produced by the string, which is much weaker than the sound we hear when playing the piano.

The Advantages Of Concert Pianos

One of the benefits of concert pianos that have very large tails, as well as longer strings that decrease inharmony and make it more stable, is that the harmonic board is much larger. Therefore that membrane that amplifies the sound is much larger and consequently the piano generates larger sound volumes which is extremely necessary to satisfy the need for greater amplification in very large concert halls. This is also a brief explanation of why concert pianos are larger than those that are not used for such purposes and it is precisely because their harmonic table must necessarily be larger to produce greater sound amplification.

We hope that through this brief article you have been able to understand the dynamics of the generation of sound in the piano, the mechanical amplification that is generated and the circuit that makes the sound inside this instrument so that it can be amplified and thus be able to generate the volume and sound intensity that we hear when playing a piano.