The history of speakers?

In order to better tell the story of human electroacoustic history, let's start with the first "telephone" that transmits human voice to a distant place. 100 years ago in February 1876, Alexander Graham Bell put forward the most important patent "telephone" in history. This invention allows human voice to travel farther than shouting. Since then, human beings have understood the conversion relationship between sound and electricity and enjoyed it.

In order to play back the recorded sound better, in 19 10, S. G. Brown separated the driving force from the diaphragm and invented the armature earphone.

19 10, Baldwin invented the balanced armature earphone. 1898, Oliver lodge applied for the first patent of practical electric loudspeaker, which moved the voice coil into the magnetic gap between the inner and outer circular plates. Like many inventions, this great invention was too advanced at that time. The invention determines the structure of 99% modern dynamic speakers.

Trumpet speakers originated from the phonograph. 1928, Winter and Silas produced their efficient loudspeaker receiver. The principle of horn speaker is that the diaphragm pushes the air at the bottom of the horn to work. Because of the high acoustic resistance, the efficiency is very high. However, because the shape and length of the horn will affect the timbre, it is not easy to reproduce the low frequency. Nowadays, high-efficiency trumpet is mainly used in the field of professional sound reinforcement.

In the process of the formation of the above speaker technology, people began to understand that the ideal transducer should use a thin diaphragm that can pass current, and everyone began to conceive a belt speaker.

Schottky and Gerlach of Siemens Halske applied for the first patent of belt loudspeaker in June 1923. It installs a horizontal wave-shaped pure aluminum film between the two poles of the magnet, which can reduce the longitudinal hardness and resonance frequency.

193 1 year, Olson and Massa produced tape microphones.

Belt speakers are mainly used in middle and high frequency bands. Because of its flat frequency response curve, extremely high upper frequency limit and very good transient effect, it can easily form a linear sound source.

Electroacoustics is changing people's lives and future. We expect that more electro-acoustic converters will be invented in the future, which will change people's entertainment ways and let nature really stay in people's arms.

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