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采样位数与采样频率我们在购买声卡时,都会碰到“8位声卡”、“16位声卡”,或者“支持44.1kHz采样”之类的性能指标,不少初学者对此往往不知所谓。要弄清这些概念,我们先来看看计算机对音频信号的处理方式。我们知道,音频信号是连续的模拟信号,而计算机处理的却只能是数字信号。因此,计算机要对音频信号进行处理,首先必须进行模/数(A/D)的转换。这个转换过程实际上就是对音频信号的采样和量化过程,即把时间上连续的模拟信号转变为时间上不连续的数字信号。根据傅立叶定理,只要在连续量上等间隔的取足够多的点,就能逼真地模拟出原来的连续量。这个“到点”的过程我们称为采样(sampling),采样精度越高(“取点”越多)数字声音越逼真。其中信号幅度(电压值)方
Sampling Bit and Sampling Frequency When purchasing a sound card, we encounter “8-bit sound card”, “16-bit sound card”, or “support 44.1kHz sampling” and other performance indicators, many beginners do not know this often. To understand these concepts, let’s take a look at how computers handle audio signals. We know that the audio signal is a continuous analog signal, while the computer can only deal with digital signals. Therefore, the computer to deal with the audio signal, you must first A / D (A / D) conversion. This conversion process is actually the audio signal sampling and quantization process, that is, the time-continuous analog signal into a discrete signal in time. According to the Fourier theorem, as long as the continuous amount of equally spaced take enough points, you can realistic simulation of the original continuous volume. This “to-the-point” process is called sampling. The higher the sampling precision (the more “take points”) the more realistic the digital sound. Which signal amplitude (voltage value) side