Generally speaking, the decibel values of each grade are as follows:

(1) 0-20 dB ocean sound;

(2) The wind of 20-40 decibels blows the treetops, whispering and watching;

(3) The general conversation voice is 40-50 decibels;

(4) 50-60 decibels of baby crying;

(5) 60-70 decibels of air conditioning sound and noisy music from the radio;

(6) 70-90 decibels of dog barking, telephone sound, piano sound and urban traffic noise;

(7) 90- 1 10 decibel lawn mower sound, truck sound and chainsaw sound;

(8) 1 10 decibel drums, rock music, airplane take-off, sirens.

Extended data

Modern pianos are mainly divided into upright pianos and grand piano in appearance.

Grand piano is the most primitive form of piano, which is usually used in concerts. This is a huge thing. In order to solve the problem of land occupation, upright piano was invented. Upright piano adopted the design scheme of staggered installation of strings, which effectively solved the balance between space requirements and timbre volume. As long as the space at home is small, you can put a upright piano.

Grand piano and upright piano have the same basic structure. It consists of a string array, a soundboard, a bracket, a keyboard system (including black and white keys and a percussion pestle, keys ***88), a pedal machine (including a top rod and a pedal) and a shell.

The piano has a wide range. Modern pianos generally have 88 keys, which can reach more than 7 octaves. Loud volume, rich timbre changes, can express all kinds of musical emotions, either rigid or soft, or urgent or slow. The treble is crisp, the midrange is full, and the bass is strong, which can imitate the effect of the whole symphony orchestra, so it has the title of "the king of musical instruments".

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