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对用扬声器的5.1通路环绕声虚拟重放系统的滤波器进行了简化,提出通过零极点的抵消可减少滤波器的脉冲响应长度。主观评价实验表明,在48kHz的采样频率下,采用128点(2.7ms)脉冲响应长度的滤波器进行处理可得到理想的主观听觉效果。采用64点(1.3ms)脉冲响应长度的滤波器会导致主观听觉效果略为下降,但实际中仍然可用。因而简化滤波器的脉冲响应长度较传统方法的5到10ms的量级要短,采用简单的FIR滤波器即可实现。
The simplification of the filter for the 5.1-channel surround-sound virtual playback system using loudspeakers suggests that the impulse response length of the filter can be reduced by zero-pole cancellation. Subjective evaluation experiments show that at a sampling frequency of 48 kHz, a perfect subjective auditory effect can be obtained by using a filter of 128-point (2.7 ms) impulse response length. Filters with a 64-point (1.3 ms) impulse response length result in a slight decrease in subjective auditory effects, but are still practically available. Therefore, the simplified filter impulse response length of the order of 5 to 10ms shorter than the traditional method, using a simple FIR filter can be achieved.