WebRTC AGC(自动增益控制) [英] WebRTC AGC (Automatic Gain Control)

问题描述

我正在测试 WebRTC AGC，但我一定是做错了什么，因为信号只是未经修改地通过.

I am testing the WebRTC AGC but I must be doing something wrong because the signal just passes through unmodified.

以下是我创建和初始化 AGC 的方法:

Here's how I create and initialize the AGC:

agcConfig.compressionGaindB = 9;
agcConfig.limiterEnable = 1;
agcConfig.targetLevelDbfs = 9;   /* 9dB below full scale */

WebRtcAgc_Create(&agc);
WebRtcAgc_Init(agc, minLevel, maxLevel, kAgcModeFixedDigital, 8000);
WebRtcAgc_set_config(agc, agcConfig);

然后对于每个 10ms 的样本块，我执行以下操作:

And then for each 10ms sample block I do the following:

WebRtcAgc_Process(agc, micData, NULL, 80, micData, NULL, micLevelIn, &micLevelOut, 0, &saturationWarning);

其中 micLevelIn 设置为 0.

谁能告诉我我做错了什么?

Can somebody tell me what I'm doing wrong?

我预计全量程正弦音会衰减到目标 DBFS 级别；低电平正弦音(即 -30dBFS)将被放大以匹配目标 DBFS 电平.但这不是我所看到的.

I expected that a full scale sine tone would be attenuated to the target DBFS level; and a low level sine tone (i.e. -30dBFS) would be amplified to match the target DBFS level. But that's not what I'm seeing.

推荐答案

以下是用于 Webrtc_AGC 的操作顺序:

Here is the sequence of operations to be used for Webrtc_AGC:

1. 创建AGC:WebRtcAgc_Create
2. 初始化AGC:WebRtcAgc_Init
3. 设置配置:WebRtcAgc_set_config
4. 初始化capture_level = 0
5. 对于kAgcModeAdaptiveDigital，调用VirtualMic:WebRtcAgc_VirtualMic
6. 使用 capture_level 处理缓冲区:WebRtcAgc_Process
7. 获取从WebRtcAgc_Process返回的输出捕获级别并将其设置为capture_level
8. 对 音频缓冲区
重复 5 到 7
9. 摧毁 AGC:WebRtcAgc_Free

1. Create AGC: WebRtcAgc_Create
2. Initialize AGC: WebRtcAgc_Init
3. Set Config: WebRtcAgc_set_config
4. Initialize capture_level = 0
5. For kAgcModeAdaptiveDigital, invoke VirtualMic: WebRtcAgc_VirtualMic
6. Process Buffer with capture_level: WebRtcAgc_Process
7. Get the out capture level returned from WebRtcAgc_Process and set it to capture_level
8. Repeat 5 to 7 for the audio buffers
9. Destroy the AGC: WebRtcAgc_Free

检查 webrtc/modules/audio_processing/gain_control_impl.cc 以供参考.

Check webrtc/modules/audio_processing/gain_control_impl.cc for reference.

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