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在市场上,标称为环绕功放、环绕解码器的器材随处可见。其中有的将输入的两路信号进行简单的加减即可变成4声道,或是4.1声道。有的虽有杜比环绕声,但不具备Pro Logic(定向逻辑)解码功能,因此,也不能算作是真正的环绕声。要想鉴别这些器材是否具有杜比环绕声Pro Logic解码功能,除了查看说明书及面板上的相应标识外,还可辅以下面介绍的环绕声测试信号仪进行鉴别。
In the market, the nominal surround amplifier, surround the decoder equipment everywhere. Some of them will enter the two signals can be simply added or subtracted to 4-channel, or 4.1 channel. Although some Dolby surround sound, but do not have Pro Logic (logic decoding) function, therefore, can not be counted as a true surround sound. To identify whether these devices have Dolby Pro surround sound Pro Logic decoding, in addition to see the instructions and the corresponding logo on the panel, but also with the following surround sound test signal analyzer to identify.