The development history of audio technology can be divided into four stages: electron tube, transistor, integrated circuit and field effect 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 tube amplifier sounds sweet and round, it is still preferred by enthusiasts.
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.
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.
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.
Type of home audio
Generally speaking, the combination audio has two categories: desktop combination audio and floor-standing combination audio. Because the combination sound requires a relatively high sound quality, its two speakers are generally large in size.
Divided by the structure of the host (number of layers), the sound has two types of integrated and layered. In an integrated stereo, its various circuits (including the record player) are housed in a single housing, which is typically used in low-end stereos. In a layered stereo, the number of layers is different depending on the grade of the machine. Among the more layered stereos are: one layer of record player, one layer of CD player, one layer of tuner, one layer of dual card recording and playback, one layer of tone controller, and one layer of main power amplifier. In a less layered combination, the record player and the CD player are each layered, and the other is a layer.
Miniaturization, digitization, specialization, and film and television are the inevitable development trends of home audio.
Miniaturized sound. Micro-desktop stereos have a long history of development, and advanced ultra-small stereos have appeared more than 10 years ago. However, since the listening speaker, the stereo record player, and the recording deck are not well solved, they stay at a lower level. In order to create a compact audio world, we must not only work on amplifiers, control components, left and right speakers, but also from the tuner, CD player and recording deck.
Digital audio. Digital technology is a new technology, so digital audio developed in solving the distortion problem of analog acoustic noise. After the digital technology is used in the audio, the recorded digital signal has a clear resolution from the sampling frequency to the quantization characteristic, and there is no color jitter, resulting in a very clear image. And it can be interchanged with the host computer, which is incomparable with analog recording and playback equipment. Digital recording can record the time, person name and address together, use the micro keyboard to complete the cataloging work, change the track number, and add the remote control function, so that you can automatically search for the required tracks, which is convenient to use.
Film and television equipment integration. With the development of electro-acoustic technology, film and television technology and computer technology, digital audio can form a mixed multimedia video and audio system in the family. Such a system can hear various signal inputs and function conversions at the input end, and the computer can process the various images and hear various sounds.
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