(2) Chinese name: Horn, mbth, date of invention: 1877, sound production principle: electric energy is converted into sound, including ribbon, horn and air cushion horn.
(3) Basic explanation: The horn is a wind instrument, which is thin on the top and thick on the bottom, and is made of copper. It can also refer to electroacoustic components, which are used to convert electrical signals into sound, also called speakers. ? It can also be used to describe someone who advocates and publicizes for others.
Specific explanation:
(1) Folding wind instrument, a kind of wind instrument, is thin on the top and thick on the bottom, mostly made of copper, commonly known as trumpet. Wind instrument, thin on the top and thick on the bottom, with the bottom opening around, can amplify the sound. Ming? Qi Jiguang? "Ji Xiaoxin's Letter Order": "Anyone who blows the horn and swings the team must meet at each post at the same time." The strange situation witnessed in 20 years Chapter 6 and Chapter 8: "Suddenly, I heard a knock in my ear and the horn rang for a while." ? Mao Dun? Color blindness: "Loud notes are blown from the loudspeaker, flying around and hitting the eardrum of Lin Baishuang." Note: The trumpet, commonly known as suona, is the electroacoustic element in this paragraph.
(2) Electro-acoustic elements. Its function is to convert electrical signals into sound. Also known as speakers. ? Ba Jin? "Death" me: "(the driver) honks the horn first, and then drives away." ? Wei Wei? Chapter 16 of the fourth part of Oriental: "At this critical moment, I suddenly heard a strange radio horn on the left mountainside ahead." Folding metaphor is a person who advocates and publicizes for others. ? Mao Dun? "Midnight" episode 8: "You still say that Han is a friend, but what friend! He is Zhao's trumpet. "
(3) As early as 1877, Erenst Verner of Siemens Company of Germany obtained the patent of moving-coil horn according to Fleming's left-hand law. 1898, Sir Oliver Lodge of England further invented the conical horn according to the principle of telephone megaphone, which is very similar to the modern horn we are familiar with. Sir Lodge called it a "roaring phone".
But this invention can't be used, because Lee De Forest didn't invent the triode vacuum tube until 1906, and it was several years later that it was made into a usable amplifier, so the cone-basin horn didn't gradually become popular until 1930. Another reason is that 192 1 year produced a new record recorded by electricity, which has a better dynamic range (up to 30dB) than the traditional mechanical record, forcing people to try to improve the speaker characteristics to match.
1923, Bell Laboratories decided to develop a complete music reproduction system, including new record player and speaker, stereo recording and MC head, stereo carving, etc. It was in this wave of action that it was invented. The important task of developing speakers falls on two engineers, CW Rice and W. Kellogg.
The equipment they used was unprecedented at that time, including a 200-watt vacuum tube expander, many recordings made by Bell Laboratories, and various speakers developed by Bell Laboratories over the years, such as Rocky's cone-basin speaker prototype, compressed air speaker controlled by diaphragm flap, corona discharge speaker (today called ionization driver) and electrostatic speaker.