CS277122B6 - Sounding board, particularly for musical instruments - Google Patents

Abstract

The sound board consists of a cavity system acoustic resonators. Resonators (3) are formed by dividing the space between the outer surfaces of the plate (2) with a set of partitions (1), and are filled with a gaseous substance, for example by air.

Description

Field of technology:

Sound boards are an important means of transforming mechanical vibrations into sound waves. The crucial requirement is their ability to oscillate over a wide range of audible frequencies with minimal energy loss. The degree to which these claims are resolved determines the quality of the results in a number of applications, such as the design and manufacture of musical instruments.

Prior art:

The effort to achieve optimal properties of the soundboards has brought a number of different constructions. The classic - and so far probably unsurpassed solution is the use of natural material - wood, which is further machined into the desired form. Many other proven solutions - metal, polymer, ceramic, composite or laminated boards of various types of materials - did not produce the expected results. Although some of them are used industrially (for example, laminated graphite composite boards - wood in the manufacture of percussion instruments), grown wood boards are still considered to be of the highest quality. However, it is inevitable to accept the fundamental disadvantages of wood as a material for sound boards. Wood significantly changes its physical and therefore acoustic properties depending on the microclimatic conditions of the environment, especially humidity. As a result, the construction of the wooden soundboard is acoustically unstable in time and space. Not every wood has the properties needed for the construction of soundboards, but only certain types, especially the so-called resonant spruce. However, this tree grows only in very specific climatic conditions and is therefore a highly deficient material on a global scale. The complete non-standardity of the acoustic parameters of grown wood brings a fundamental disadvantage of the practical non-reproducibility of the production of wooden soundboards with the required properties.

Summary of the invention:

The sound board according to the invention allows a controlled influence of all essential acoustic parameters. Instead of a construction made of materials exclusively in the solid state, it brings about the creation of a new type of sound plate, realized as a system of acoustic cavity resonators filled with a gaseous substance, for example air. The air columns oscillate in certain spaces at frequencies given by the geometric dimensions of the cavities. It is therefore possible to influence the resonant frequencies of the gaseous substance contained in them by choosing these dimensions. If the sound board is constructed as a system of such acoustic resonators with different resonant frequencies, the degree of their representation can influence the acoustic response of the board.

The progress achieved by the implementation of the sound board according to the invention can be characterized mainly by increasing the efficiency of transformation of mechanical oscillations into sound waves, and thus by achieving higher volume and tone length, also by choosing the course of acoustic response of the board to oscillations of different frequencies. environment and the possibility to produce soundboards with the required properties repeatedly.

Picture in the drawing;

In the accompanying drawing, there is an axonometric view of a partial section of a guitar soundboard, described in the following example of a specific embodiment of the invention.

Description of an exemplary embodiment of the invention:

A practical specific embodiment of the sound board according to the invention is feasible in a number of ways in which the required resonator system can be realized. For example, in the construction of a guitar soundboard, schematically shown in the accompanying drawing, a set of baffles 1 defining sub-spaces of acoustic resonators is formed by pressing a fiber-reinforced polymeric material, while the outer surfaces of the soundboard 2 are glued to the molding. The resulting acoustic cavity resonators 3 are filled with atmospheric air. In the practical design of more demanding soundboards, such as a piano, the variability and number of partition shapes is considerably higher depending on the required acoustic response of the soundboard.

Industrial applicability; . AND

The invention can be used in fields where there is a need to transform mechanical oscillations into sound waves, especially in the manufacture of musical instruments.

Claims (1)

PATENT CLAIMS A soundboard, in particular for musical instruments, characterized in that it consists of a set of acoustic cavity resonators (3) formed by dividing the space between the outer surfaces of the soundboard (2) by partitions (1), the resulting cavities being filled with a gaseous substance.