Sox http://sox.sourceforge.net/Main/HomePage,“音频处理的瑞士军刀”,可以从声音文件生成准确的 PNG 频谱图。它几乎可以播放任何内容,并且二进制文件可用于 Windows。在最基本的层面上,你会使用这样的东西:
sox my.wav -n spectrogram
如果您想要一个没有轴、标题、图例和 100 像素高的浅色背景的频谱图:
sox "Me, London.mp3" -n spectrogram -Y 130 -l -r -o "Me, London.png"
例如,如果您只想分析单个通道,Sox 可以接受很多选项。如果您需要更酷的视觉效果,您可以对生成的 PNG 进行后处理。
以下是命令行中有关所有可用参数的简短概述,联机帮助页有更多详细信息 http://linux.die.net/man/1/sox:
-x num X-axis size in pixels; default derived or 800
-X num X-axis pixels/second; default derived or 100
-y num Y-axis size in pixels (per channel); slow if not 1 + 2^n
-Y num Y-height total (i.e. not per channel); default 550
-z num Z-axis range in dB; default 120
-Z num Z-axis maximum in dBFS; default 0
-q num Z-axis quantisation (0 - 249); default 249
-w name Window: Hann (default), Hamming, Bartlett, Rectangular, Kaiser
-W num Window adjust parameter (-10 - 10); applies only to Kaiser
-s Slack overlap of windows
-a Suppress axis lines
-r Raw spectrogram; no axes or legends
-l Light background
-m Monochrome
-h High colour
-p num Permute colours (1 - 6); default 1
-A Alternative, inferior, fixed colour-set (for compatibility only)
-t text Title text
-c text Comment text
-o text Output file name; default `spectrogram.png'
-d time Audio duration to fit to X-axis; e.g. 1:00, 48
-S time Start the spectrogram at the given time through the input