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What is the lowest round-trip audio latency achievable with iPhone 4?

最低音频往返延迟是指在iPhone 4上实现的最低音频延迟。音频延迟是指从发送端到接收端的音频传输所需的时间。在iPhone 4上，最低音频往返延迟可以通过以下方法实现：

使用专门的音频传输协议，如WebRTC（Web Real-Time Communication）或VoIP（Voice over Internet Protocol）。
优化网络连接，使用Wi-Fi或蜂窝网络，确保网络稳定和低延迟。
使用低延迟音频编解码器，如Opus或Speex。
优化音频传输参数，如降低音频采样率和比特率。
使用专门的音频处理硬件，如iPhone 4上的麦克风和扬声器。

在实际应用中，最低音频往返延迟的实现取决于网络状况、音频编解码器和传输协议等因素。为了实现最低的音频延迟，可以使用腾讯云的实时音视频（TRTC）服务，它提供了低延迟、高质量的音视频传输服务，适用于在线教育、在线游戏、在线会议等场景。腾讯云TRTC的产品介绍链接地址：https://cloud.tencent.com/product/trtc

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