DSD (Direct Stream Digital) is a high-resolution digital audio specification published by Sony and Philips in 1996. The new technology of DSD competes with the audio technology of DVD, and samples with 1bit bitstream. The high sampling mode with a sampling rate of 2.8224 MHz (64 times of CD 44.1khz) directly converts the analog music signal waveform into a digital signal in a pulse mode, and stores music in a space nearly four times that of CD, so it can provide better sound effects.
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Sounds include the sounds of natural environment, animals, machines and tools, and all kinds of sounds made by human actions. 1906, American deforest invented the vacuum triode, which pioneered the electro-acoustic technology of human beings. Audio equipment consists of sound source, control equipment, audio processor, power amplifier and sound box. The development of audio technology can be divided into four stages: electron tube, transistor, integrated circuit and field effect tube.
A sound system usually includes:
1, audio equipment: (listed as: DVD, CD, MP3, MP4, computer, mobile phone, microphone and other audio output equipment)
2. Audio signal dynamic processing equipment (voltage limiter, effector, mixer, audio processor, equalizer and other audio signal processing equipment).
3. Audio signal amplification equipment (analog power amplifier and pre-stage power amplifier, post-stage power amplifier, digital power amplifier and other equipment).
4. Sound reproduction equipment (full range speakers, ceiling speakers, pillars, linear array speakers, array speakers, tweeters, subwoofers, etc.). The development history of technology can be divided into four stages: electron tube, transistor, integrated circuit and field effect tube.
Baidu encyclopedia -DSD