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Stereo "post-processing technology"

Although various stereo systems make the playback sound field more vivid and gorgeous, it has been found that after the decoding process or after decoding, some technical processing or introducing some specifications can be made to make the playback sound field have better results The These technologies and specifications do not exist in the sound source coding, known as "post-processing technology", common DSP and THX and so on.

?DSP is the "digital signal processing" abbreviation, in the field of electro-acoustic, especially the digital audio signal processing. Mainly through the A / D (A / D) transformation of the audio analog signal into digital signals, and then use digital electronic technology, equalization, delay, reverberation, phase shift and other processing, and then by D / A (digital / ) To restore the analog signal to simulate the theater, dance halls, studio effects. Equalization, delay reverberation phase shift processing can be directly used to operate analog signals, but the corresponding hardware is very complex, and it is difficult to ensure a satisfactory signal to noise ratio, and digital processing can be supported by the software to get a good effect The The DSP can also simulate an unencoded monaural signal into a fake stereo signal for full stereo playback. Another common function of DSP is "tone". In the karaoke system, "tone" can make the player in the disc (accompaniment) with the singer's tone in harmony.

Incidentally, all true stereo, surround sound first requires a corresponding, encoded source. Otherwise, even if there is a decoding device, there are multiple playback channels (amplifiers and speakers), but also can not put the stereo, surround sound to. Although the use of DSP technology can simulate the "stereo", but it is fake stereo, can only create an atmosphere without reproduce the original sound field sound distribution beats earphones of the real effect. On the other hand, even if there is a stereo source, if there is no corresponding decoder, but only multi-channel amplifier and multi-channel speakers, the same can not be reproduced stereo. Unfortunately, there are a lot of no decoder on the market, "stereo equipment" fish, do not fooled.

?As for the THX is mainly an authoritative certification. Must meet certain technical specifications in order to obtain this certification. THX was originally for the stereo cinema sound field quality, requiring smooth sound smooth, audio and video unity, and later extended to other audio fields. The main conditions for obtaining THX certification are: L, R, C three channel speakers with the same characteristics, and has good pointing characteristics; low speakers by 120Hz or 200Hz frequency, with a lower frequency of 20Hz; rear surround The channel uses a positive phase, a reverse mode, to create a much larger sound surround than the actual environment; the amplifier must have a stable power output, low noise, non-linear distortion of not more than 0.03%; From the current technical level, beats by dre cheap the above requirements are not difficult to achieve, the problem is the need to get THX authority certification. There are also some audio amplification devices built-in THX processing components, to ensure that equipment to THX technical requirements. But because THX itself does not have the meaning of decoding, so THX components must work together with a certain decoding components.

?As for the THX is mainly an authoritative certification. Must meet certain technical specifications in order to obtain this certification. THX was beats by dre on sale originally for the stereo cinema sound field quality, requiring smooth sound smooth, audio and video unity, and later extended to other audio fields. The main conditions beats headphones on sale for obtaining THX certification are: L, R, C three channel speakers with the same characteristics, and has good pointing characteristics; low speakers from 120Hz or 200Hz began to divide, with the lower limit to 20Hz frequency; Of the surround channel using a positive phase, a reverse mode, to create a much larger than the actual environment of the sound surrounded by a sense of power amplifier must have a stable power output, low noise, non-linear distortion is not greater than 0.03% and so on. From the current technical level, the above requirements are not difficult to achieve, the problem is the need to get THX authority certification. There are also some audio amplification devices built-in THX processing components, to ensure that equipment to THX technical requirements. But because THX itself does not have the meaning of decoding, so THX components must work together with a certain decoding components.