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                                样例使用说明
                             Sample Description
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功能描述：
此样例演示了USB模拟speaker功能。
USB虚拟串口主要通过USB AUDIO类实现，将其模拟成一个speaker设备，当插在电脑上时，
可以显示成一个扬声器设备。

Function descriptions:
This sample demonstrates the functionality of a USB-simulated speaker.
The USB virtual serial port is primarily implemented through the USB AUDIO class, 
simulating it as a speaker device. When plugged into a computer, it can be 
displayed as a speaker device.
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测试环境：
测试用板：PY32E407_STK
MDK版本： 5.28
IAR版本： 9.20
GCC版本：GNU Arm Embedded Toolchain 10.3-2021.10

Test environment:
Test board: PY32E407_STK
MDK Version: 5.28
IAR Version: 9.20
GCC Version: GNU Arm Embedded Toolchain 10.3-2021.10
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使用步骤：
1. 编译并下载程序；
2. 运行,电脑端出现一个扬声器设备

Example execution steps:
1.Compile and download the program.
2.Run the program, and a speaker device will appear on the computer.

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注意事项：

Notes:
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