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Нашел даташит на 6225, судя по нему есть левый и правый выходы звука, а так же отдельный при разговоре, интересно, они все на один спикер заведены в данном теле? По подлючению микросхем инфы не нашел, вот что в даташите по звуку было:
Audio mixed-signal blocks (AMB) integrate complete voice uplink/downlink and audio playback functions. As shown in
the following figure, it includes mainly three parts. The first consists of stereo audio DACs and speaker amplifiers for audio
playback. The second is the voice downlink path, including voice-band DACs and amplifiers, which produces voice signal
to earphone or other auxiliary output device. Amplifiers in these two blocks are equipped with multiplexers to accept
signals from internal audio/voice or external radio sources. The last is the voice uplink path, which is the interface between
microphone (or other auxiliary input device) input and MT6225 DSP. A set of bias voltage is provided for external electret
microphone..
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