wav

Author: FolderLevel

README.md

@@ -12,6 +12,7 @@
 
 NO.|文件名称|摘要
 :--:|:--|:--
+0021| [wav声音PCM数据分析](docs/0021_wav声音PCM数据分析.md) | 通过wav文件了解PCM数据
 0020| [Android_Binder通信](docs/0020_Android_Binder通信.md) | 在树莓派中理解Android Binder通信
 0019| [USB_OTG虚拟串口](docs/0019_USB_OTG虚拟串口.md) | USB OTG虚拟串口，可用于学习串口通信
 0018| [利用AT24C02_EEPROM理解I2C通信](docs/0018_利用AT24C02_EEPROM理解I2C通信.md) | 利用Overlay加载AT24C02 I2C驱动，通过i2c-tools获取数据

docs/0021_wav声音PCM数据分析.md

@@ -0,0 +1,34 @@
+# wav声音PCM数据分析
+
+通过wav文件了解PCM数据
+
+## steps
+
+* apt-cache search audacity
+  ```
+  audacity - fast, cross-platform audio editor
+  audacity-data - fast, cross-platform audio editor (data)
+  debian-edu-doc-en - English documentation from the Debian Edu project
+  debian-edu-doc-fr - French documentation from the Debian Edu project
+  debian-edu-doc-nb - Bokmål documentation from the Debian Edu project
+  debian-edu-doc-nl - Dutch documentation from the Debian Edu project
+  debian-edu-doc-zh - Chinese documentation from the Debian Edu project
+  forensics-extra-gui - Forensics Environment - extra GUI components (metapackage)
+  silan - commandline tool to detect silence in audio-files
+  vamp-plugin-sdk - audio analysis and feature extraction plugins (SDK)
+  ```
+* sudo apt-get install audacity
+* [示例源代码](https://github.com/ZengjfOS/RaspberryPi/tree/wavefile)
+  * make
+* 设置为耳机输出声音，注意关闭远程桌面进行设置：sudo rasp-config
+  * System Options
+    * Audio
+      * 0 Headphones
+* ./wavfile
+  * sound.wav
+  * 声音有点难受
+* aplay sound.wav
+* 远程桌面打开：audacity
+  * sound.wav
+
+![0021_wav_audacity_audio_editor.png](images/0021_wav_audacity_audio_editor.png)