简单介绍 Dolby Pro Logic II

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Dolby Pro Logic II 是一种由 Jim Fosgate 设计的音频处理技术，于2000年推出。该技术能将高质量立体声信号转换为五个全频段独立通道，提供更稳定的声音场，模拟5.1环绕声效果。此外，Dolby Pro Logic II 还支持从传统的四声道 Dolby Surround 编码中解码出五声道音频，并引入了音乐模式，允许用户调整前声场宽度等。

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Dolby Pro Logic II logo

Older logo, before Dolby updated their overall logo design.

In 2000, Dolby introduced Dolby Pro Logic II (DPL II), an improved implementation of Dolby Pro Logic created by Jim Fosgate.^[4] DPL II processes any high quality stereo signal source into five separate full frequency channels (right front, center, left front, right rear and left rear). Dolby Pro Logic II also decodes 5 channels from stereo signals encoded in traditional four-channel Dolby Surround. DPL II implements greatly enhanced steering compared to DPL, and as a result, offers an exceptionally stable sound field that simulates 5 channel surround sound.

Because of the limited nature of the original DPL, many consumer electronics manufacturers introduced their own processing circuitry, such as the "Jazz", "Hall", and "Stadium" modes found on most common home audio receivers. DPL II forgoes this type of processing and replaces it with simple servo (negative feedback) circuits used to derive five channels. The extra channel content is extracted using the difference between the spatial audio content between two individual channels of stereo tracks or Dolby Digital encoded 5.1 channel tracks and outputs it appropriately. In addition to five full range playback channels, Pro Logic II introduced a Music mode which includes optimized channel delays, and adds user controls to—for example—adjust apparent front sound stage width.

Pro Logic II system also features a mode designed specifically for video gaming, and was frequently used in game titles for Sony's PlayStation 2, Nintendo's GameCube and Wii as an alternative to digital surround formats such as Dolby Digital, or DTS.