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三、编码(code)——PCM 编码编码就是用 n 位(bit)的二进制数码(0或1)表示取样元的量化值。我们把模拟信号通过取样→量化离散数字化后,用二进制数码表示的脉冲编码调制称为PCM 编码(Pulse code modeulation 的缩写)。当量化层数为 N 时,需要 n=lg_2N 位二进制数码来表示,若 N=256,则 n=lg_2256=lg_22~8=8位(bit)。
Third, the code (code) - PCM coding is the use of n-bit binary number (0 or 1) that the quantizer sample value. After we digitize the analog signal by sampling → quantizing, the pulse code modulation represented by a binary number is called the PCM code (abbreviation of Pulse code modeulation). When the quantization level is N, it needs n = lg_2N bit binary number to represent, if N = 256, then n = lg_2256 = lg_22 ~ 8 = 8 bits.