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https://e2e.ti.com/support/wireless-connectivity/wi-fi-group/wifi/f/wi-fi-forum/587142/wl1831mod-hfp-call-pcm-output-has-puff-pop-for-a-single-frequency-sound-output-is-obvious
连接到蓝牙、呼叫电话、对方未应答嘟嘟声弹出音。 该调用也存在。 如果另一方发出单频音、则 PCM 输出很容易听到噼啪声。
WL1831MOD .bts 是
e2e.ti.com/.../2.txt
PCM 至 AK7756、AK7756 时序：
空气和冷量：
e2e.ti.com/.../cfa-and-lgr.rar
