Sound refers to sounds other than human language and music, including the sound of the natural environment, the sound of animals, the sound of machine tools, and various sounds emitted by human actions. The sound probably includes a power amplifier, a weekly device (including a limiter, an effector, an equalizer, a VCD, a DVD, etc.), a speaker (speaker, a speaker) mixer, a microphone, a display device, and the like. Among them, the speaker is a sound output device, a speaker, a subwoofer, and the like. One speaker includes three types of speakers: high, low, and medium, three but not necessarily three.
The development history of audio technology can be divided into four stages: electron tube, transistor, integrated circuit and field effect tube.
Electronic tube
In 1906, American DeForrest invented the vacuum triode, which pioneered the human electroacoustic technology. In 1927, Bell Labs invented the negative feedback technology, which made the development of sound technology enter a new era. More representative, such as Williamson amplifier, successfully used the negative feedback technology to greatly reduce the distortion of the amplifier. In the 1950s, the development of tube amplifiers reached a climax, and various tube amplifiers emerged in an endless stream. Because the main technical indicators of the tube are sweet and mellow, they are still preferred by enthusiasts.
Transistor
The emergence of transistors in the 1960s has enabled the majority of audio enthusiasts to enter a broader sound world. Transistor amplifiers feature exquisite and impressive sound, low distortion, wide frequency response and dynamic range.
integrated circuit
In the early 1960s, the United States first introduced a new member of the audio technology, integrated circuits. In the early 1970s, integrated circuits were gradually recognized by the audio industry for their high quality, low price, small size, and many functions. Up to now, thick film audio integrated circuits and operational amplifier integrated circuits have been widely used in audio circuits.
Field effect transistor
In the mid-1970s, Japan produced the first field effect power tube. Because the field effect power tube has the characteristics of pure thick tube, sweet tone and dynamic range of 90dB and THD<0.01% (100kHz), it is very popular in the audio industry. Many of today's amplifiers use FETs as the final stage output.
Future sound development trend
Nowadays, digital products such as computers and mobile phones are impacting the audio industry. The speaker industry should follow the footsteps and develop products that are compatible with computers and mobile phones. For example, it is compact and easy to carry. It uses Bluetooth and wireless connection when using.
In general, the development trend of the audio industry is digital, integrated and personalized. At present, in addition to the traditional audio and video functions, some of the products currently on the market have added radio functions and high-definition multimedia interfaces (HDMI). With the rapid development of networking, the USB interface has become one of the must-have features of many products.
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