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About "overtone" and "reverberation"

"Overtone" and "reverberation" are two different concepts that are often misunderstood, confused, and understated.

?The overtone refers to a natural musical instrument (natural vibration of the sound of the instrument, including the human voice, not plugged in, the sound of electronic synthesis), the sound is issued by a pitch plus a series of overtones. Is an integer multiple of the pitch frequency, and it is to be noted that the pitch and the overtone are issued at the same time, not in minutes.

For example, a piano pulls out a 1000 Hz sound, and at this point we hear the sound, which contains the pitch of 1000 Hz, as well as a series from 2000 Hz, 3000 Hz, 4000 Hz, 5000 Hz ..... Up to 10,000 Hz, and the overtone of 11,000 Hz. The overtone extends from the low to the treble area, and some instruments can extend beyond 1 000 Hz or even beyond the human ear. Of course, the higher the frequency, the more The violin 's high - frequency overtone can be extended to more than 10,000 Hz, but the overtone energy of more than 10,000 Hz is very weak.

?The reason why this principle is due to the existence of "partial vibration" phenomenon, that is when the vibration source (sound source) in the overall vibration, while there is part of the vibration. The overall vibration is the pitch, and part of the vibration is issued a Series of overtone.

Where is the importance of overturning? Is that each instrument has its own characteristics of the overtones, and that our ears are by this, to distinguish between different instruments. A piano, a violin, a cello, a SAX, played The same tone, such as the central C, then the pitch is the same, are 261.6 Hz. Why do we know that this is the C is issued by the piano, the C sound is the violin, this is SAX, that is The trumpet is because each instrument, although playing the same pitch, is an integer multiple of the extant column, the ratio is completely different. That is 261.6X2,261.6X3,261.6X4 those frequencies of the overtone, the different proportions. So the same pitch, mixed with different features of the overtone, we get is a completely different sound: piano sound, violin sound, trumpet sound, etc. The keyboard is to simulate the characteristics of different instruments of the series, to simulate a lot of musical instruments Sound effect.

?In the case of HI-FI, it is difficult to accurately show this overtone column, especially in the cheap beats by dre high-frequency overtone, for example, more than 10,000 Hz high frequency, very high frequency overtone. Although these are located in the high frequency And very high frequency of overtone, the energy is very weak, but no way, our ears are sensitive to identify these weak high frequency overtone missing!

So a HI-FI equipment must have a wide frequency response, especially the excellent high-frequency extension, and the straight frequency response, in order to complete and accurately show the instrument overtone, so that we hear the real tone The

?"Reverb" is also used by some people to call it "Reverberation", referring to the original sound source (such as a violin) in the stop sound, that is, after the sound source stops vibrating, in a space, it sounds before Which is closely related to the length of the sound, and the "space" is closely related, so the concept of reverberation and the space in which the instrument is located is of great importance (and "overtone") There is nothing in the space!

If there is no "space", for example, you are in the endless wild piano, the sound of all sent to all sides spread out, in addition to the existence of the ground, will produce a little bit of "reverberation" (acoustic contact with the ground after the reflection ), This time "reverberation" is extremely weak.If a person jumped from the plane, singing in the air, that his song is a little bit of reverberation are not, and if you in a room pull the piano, The sound of the reverberation is very obvious.You heard the piano, in addition to directly from the strings to the ear of the so-called "direct sound", after the surrounding walls and reflection of the ground from the "reflection" (will delay a little) When you stop the piano, the piano will stop the vibration, there will be reverberation caused by the sound of reflection, until the sound waves are absorbed by the air and the walls so far.

Generally speaking, in a space, the length of the reverberation, and the size of the space and the wall around the material, is closely related to some of the material wall is easy to cheap beats by dr dre absorb acoustic energy, so reflected back to the sound waves, some materials Of the wall is rarely absorbed sound waves, like the mirror, like most of the sound waves are playing back, so that reflected back to beats by dre the sound waves, reverberation on the strong, reverberation time on the music playing places such as the concert hall, there A good reverberation time, too short too long too bad. Too short words too "dry", listen to sense of nature, and too long, it is easy to mix, clarity down.