dolby audio is a Dolby sound enhancement auxiliary tool; Dolby Pro Logic is a surround sound system developed by Dolby; Dolby surround sound system is developed by Dolby Laboratories to improve stereo quality A movie sound system that records four-channel stereo sound into two channels through a specific encoding method.
The operating environment of this article: Windows 7 system, Dell G3 computer, Dolby Audio version 4.73.0.
Dolby Audio (Dolby sound enhancement tool) is a very easy-to-use Dolby sound enhancement auxiliary tool. Dolby Audio tool is powerful, easy to use and supports Lenovo laptops and desktops.
Directional logic:
The decoding of Dolby Pro Logic II is to restore the Dolby Surround encoded signal (2/0 signal) to 5.1 channel decoding. This is a new standard developed based on Dolby Pro Logic. Pro Logic II received the biggest improvements in surround channel frequency response and mono-to-stereo, followed by significant improvements in the main sound fields (left, center, and right). Stereo signals that are not processed by Dolby encoding have certain effects by using Dolby Pro Logic II decoding.
Main Principle:
Dolby Pro Logic Surround For playback symmetry, the surround speakers use the left and right surround speakers output from the amplifier, so the output of Dolby Pro Logic Surround is in commercial It is called pentatonic. However, since the left and right surround speakers are connected to one channel, the output is the same surround channel information, so it's still essentially four channels. There are also commercially available six- and seven-channel Dolby Pro Logic AV amplifiers. The so-called six-channel output center channel has two amplification lines that connect to the left and center speakers. However, the left and right center speakers are connected to the center channel, so it's basically four channels. The seven-channel surround sound channel is divided into four-channel output, namely left rear surround sound, right rear surround sound and four-channel surround sound, the latter becoming a seven-channel output. However, a seven-channel output with four surround speakers connected to the surround channels only counts as a four-channel output. Therefore, an AV amplifier with a Dolby Pro Logic decoder is basically four channels, whether it is five-channel output, six-channel output, or seven-channel output. The left channel, center channel and right channel of Dolby Pro Logic surround sound can reach 20-20000 Hz, which can meet the full range requirements, but the frequency range of the surround channel is very narrow, only 100-7000 Hz.
Basic introduction:
Dolby Pro Logic is a surround sound system developed by Dolby. Dolby Surround is a movie sound system developed by Dolby Laboratories to improve stereo sound quality. It records through a specific encoding method that combines four-channel stereo sound into two channels, namely the original left channel (L), right channel (R), center channel (C), and surround channel (S). signal) are encoded into LT and RT composite binaural signals, and the encoded binaural composite signals LT and RT are restored to encoded left, right, center and surround by the decoder during playback. Four independent signals that do not interfere with each other are amplified and fed into the left, right, center and surround speakers.
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