针对GSM手机的音频记录与回放Feature-Rich, Complete Audio Record/Playback for GSM/GPRS Cell Phones AUDIO CIRCUITS Jun 24, 2005 APPLICATION NOTE 3573 Feature-Rich, Complete Audio Record/Playback for GSM/ GPRS Cell Phones Short design cycles, coupled with PC-board area and cost pressures, continue to compel higher levels of integration in cell phone circuitry. Basic (low-tier) phone functionality is headed inexorably towards a one-chip solution. Meanwhile, in high- and mid-tier market segments in which model differentiation is critical, demand for high-performance, featurerich peripheral components become increasingly important. Given that market push and the continually evolving feature set, a complete analog and digital-audio solution optimized for GSM/GPRS cell phones would provide a solid core for ongoing design……