Hi-Fi knowledge

CD
A digital music disc jointly developed by Sony and Philips has two specifications of 12cm diameter and 8cm diameter. The former is the most common. It can provide 74 minutes of high-quality music.
CD-ROM
Read-only CD for storing computer data.
VCD
The audio-visual disc using MPEG-1 compression coding technology has the same image clarity as VHS video tape.
Super VCD
The improved product of VCD adopts MPEG-2 encoding, and the image clarity has been improved.
DVD
A new generation of ultra-large-capacity optical disc similar to CD, it will be widely used in high-quality audio and video program recording and as a mass storage device for computers.
MD
The mini-recordable music disc developed by Sony has a 3.5-inch floppy disk shape like a computer, but uses an optical signal pickup system similar to a CD. MD uses efficient compression technology to achieve the same recording time as CD, and the sound quality is close to CD.
D / A converter
A device that converts digital audio signals into analog audio signals in digital audio products (such as CDs and DVDs). The D / A converter can be made into an independent machine to match the CD turntable, which is often called a decoder.
CD turntable
A machine that separates the mechanical transmission part of a CD player.
Oversampling
The sampling frequency is several times the standard sampling frequency of the CD system, 44.1kHz. Its purpose is to facilitate the filtering of digital noise after D / A conversion and improve the high frequency phase distortion of the CD player. Early CD players used 2x or 4x sampling, and recent machines have reached 8x or higher.
HDCD
Abbreviation of High DefiniTIon Compact Disc (high-resolution CD)-an encoding system that improves the sound quality of CDs, is compatible with traditional CDs, but requires playback on a CD player with HDCD decoding or an external HDCD decoder to get improved effect.
Bit
The smallest unit of binary digital signal, it always takes one of two states of 0 or 1.
Bitstream
A technology used by Philips to convert CD digital signals into analog music signals.
Dolby B, C, S
A series of tape noise reduction systems developed by Dolby Corporation of the United States are used to reduce the "hiss" produced by tape recording and expand the dynamic range. Type B noise reduction system can reduce noise by 10dB, type C increases to 20dB, and type S can reach 24dB.
Dolby HX Pro
It is not a noise reduction system, but a technology to improve the distortion of high-frequency tape recording, which is also commonly referred to as "upper headroom expansion".
Dolby Surround
A sound that encodes the rear effect channel into a stereo channel. During playback, a decoder is needed to separate the surround sound signal from the encoded sound.
Dolby Pro-Logic
On the basis of Dolby Surround, a front center channel is added to lock the dialogue in the movie to the screen.
Dolby Digital
Also known as AC-3, a new generation of home theater surround sound system released by Dolby Laboratories. Its digital sound contains 5 channels of left-front, center, right-front, left surround, and right surround signals, all of which are independent full-band signals. In addition, there is a separate channel for subwoofer effect, commonly known as 0.1 channel. All these channels together are called 5.1 channels.
AV amplifier
Amplifiers specifically designed for home theater use generally have more than 4 channels and surround sound decoding.
Directional logic surround sound amplifier
AV amplifier with Dolby directional logic decoding.
Dolby Digital Amplifier
Also known as AC-3 amplifier, an AV amplifier with Dolby Digital decoding.
Receiver
Amplifier with radio function.
THX
A surround sound standard developed by Lucasfilm in the United States. It improves the Dolby directional logic surround system and further enhances the surround sound effect. The THX standard has a set of strict and specific requirements for playback equipment such as audio and video sources, amplifiers, speakers, and even connecting cables. Products that meet this standard and are certified by Lucas are only granted the THX logo.
THX 5.1
THX based on Dolby Digital System.
DTS
Discrete-channel home cinema digital sound system (Discrete-channel home cinema digital sound system), which also uses an independent 5.1 channel, the effect is even better than Dolby digital surround sound system, is a strong competitor of Dolby digital surround sound .
SRS
An American SRS company's system that uses two speakers to produce a surround sound effect.
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