diff --git a/content/posts/20211130195311-low_latency_audio.md b/content/posts/20211130195311-low_latency_audio.md
index 777a45b..0a18b0f 100644
--- a/content/posts/20211130195311-low_latency_audio.md
+++ b/content/posts/20211130195311-low_latency_audio.md
@@ -1,5 +1,5 @@
 +++
-title = "low_latency_audio"
+title = "low latency audio"
 date = 2021-11-30T19:53:00+08:00
 tags = ["PUBLIC"]
 draft = false
@@ -10,28 +10,3 @@ draft = false
 这个问题解决是乐观的，因为我们通常认为影响延迟的部分（真实的网络延迟，中美做到200ms并不难，但是做到100ms几乎在物理上是不可能的）在这个问题里面并不占主要部分。
 
 <!--more-->
-
-
-## 微信语音 {#微信语音}
-
-{{< figure src="/ox-hugo/2024-07-20_11-53-29_screenshot.png" >}}
-
-\\[1.571-0.047=0.524s\\]
-
-
-## 腾讯会议 {#腾讯会议}
-
-![](/ox-hugo/2024-07-20_11-55-01_screenshot.png)
-\\[1.563-1.173=0.390s\\]
-
-
-## 电话 {#电话}
-
-![](/ox-hugo/2024-07-20_11-55-45_screenshot.png)
-\\[1.652-1.329=0.321s\\]
-
-
-## lltalk {#lltalk}
-
-![](/ox-hugo/2024-07-20_11-56-44_screenshot.png)
-\\[2.173-2.145=0.028s\\]
diff --git a/content/posts/20240720130238-low_latency_audio_measurement.md b/content/posts/20240720130238-low_latency_audio_measurement.md
new file mode 100644
index 0000000..78eae77
--- /dev/null
+++ b/content/posts/20240720130238-low_latency_audio_measurement.md
@@ -0,0 +1,46 @@
++++
+title = "low latency audio: measurement"
+date = 2024-07-20T13:02:00+08:00
+tags = ["PUBLIC"]
+draft = false
++++
+
+终于有时间做一个测试，回答长久以来(见[low latency audio]({{< relref "20211130195311-low_latency_audio.md" >}}))很有疑问的一个问题。
+
+我们常用的语音通话服务的延迟究竟是多少。
+
+<!--more-->
+
+
+## 测试手段 {#测试手段}
+
+同样的网络环境中，两台设备分别在麦克风/扬声器附近放一个麦克风。
+两个麦克风分别作为左右声道接入声卡录音。
+
+
+## 测试结果 {#测试结果}
+
+
+### 微信语音 {#微信语音}
+
+{{< figure src="/ox-hugo/2024-07-20_11-53-29_screenshot.png" >}}
+
+\\[1.571-0.047=0.524s\\]
+
+
+### 腾讯会议 {#腾讯会议}
+
+![](/ox-hugo/2024-07-20_11-55-01_screenshot.png)
+\\[1.563-1.173=0.390s\\]
+
+
+### 电话，联通-电信 {#电话-联通-电信}
+
+![](/ox-hugo/2024-07-20_11-55-45_screenshot.png)
+\\[1.652-1.329=0.321s\\]
+
+
+### lltalk {#lltalk}
+
+![](/ox-hugo/2024-07-20_11-56-44_screenshot.png)
+\\[2.173-2.145=0.028s\\]