Analysis of the sound production principle of sound medium * * * Vibration mixed sound, sound production principle, using vibrator to vibrate and paper drum horn to produce sound, we often use the sound. People all know that the general sound is not enough except professional sound, and the general good bass volume is not small, mainly because the sound produced by the horn is greatly influenced by the size of the sound production unit, so many multimedia sounds are directly used with subwoofers. External speakers fully expand the volume range of their sound generating units, but this greatly limits the shape of the sound, which is why the sound we see in the market is generally square, angular and has poor bass effect.
A tree fell in the forest with a loud noise, but there was no one in this virgin forest, so there was no sound. Is this a sound? The sound is definitely coming, because when the trunk and branches touch the ground, they will produce some sounds, but no one will hear them, but this sound is different for humans or other animals, so this is what acoustics calls psychology.
The principle of acoustics I'm talking about here is mainly to enable a Andhadhun to understand all aspects of acoustics, instead of conducting acoustic research or master's or doctoral thesis on acoustics, so the acoustic theory I'm talking about in this book can actually be used by people who operate acoustics on the spot.
In 19 15, an American named E. S.Pridham put a telephone receiver on a speaker, and the speaker made a recording sound. When this sound could be heard by a group of people celebrating Christmas in San Francisco, electro-acoustic technology was born. After the First World War, at the inauguration ceremony of President Harding in the United States, Bell Company of the United States connected the handset to the speaker of the record player at that time, which was able to transmit the sound to a large group of people watching the inauguration ceremony of the President. Therefore, many professional sound research and sound reinforcement projects have been developed. Audio researchers not only strive to improve audio equipment, but also experiment with different kinds of audio to understand human responses to hearing. The most advanced audio researchers know that acoustics should be studied as a whole, and they have made great contributions to understanding every link of audio equipment and human physiological response to hearing.
The development history of sound tube
1906, American deforest invented the vacuum triode, which pioneered the electro-acoustic technology of human beings. 1927, Bell Laboratories invented negative feedback technology, which made the development of audio technology enter a new era. A representative example, Williamson amplifier, successfully applied negative feedback technology, which greatly reduced the distortion of the amplifier. In 1950s, the development of electron tube amplifiers reached a climax, and various electron tube amplifiers emerged one after another. Because the main technical indexes of electron tube amplifier are sweet and mellow, it is still favored by enthusiasts.
transistor
The appearance of transistors in the 1960s made audio lovers enter a wider audio world. Transistor amplifier has the characteristics of exquisite tone, low distortion, wide frequency response and large dynamic range.
integrated circuit
In the early 1960s, the United States introduced integrated circuits for the first time, which is a new member of audio technology. By the early 1970s, integrated circuits were gradually recognized by the audio industry for their high quality, low price, small size and multiple functions. So far, thick film audio integrated circuits and operational amplifier integrated circuits have been widely used in audio circuits.
field-effect tube
In the mid-1970s, Japan produced the first field effect power tube. Due to the pure thickness, sweet timbre and dynamic range of 90dB, THD
An inseparable part of sound.