MTK资料大全（内部）

MT621x Audio block IntroductionB

MT621x Audio Block Introduction

Ethan Lee Media Tek 8 March, 2005

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Audio Front-end and Modem codec
Audio and Modem codec
§ § § § § § § § § § § Wavetable synthesis with up to 64 tones include 128 instruments and 47 set of percussion PCM Playback and Record Voice Memo Noise Reduction Echo Suppression (ES/EES) Advanced SidetoneOscillation Reduction Digital sidetonegenerator with programmable gain Two programmable acoustic compensation filters (Uplink, downlink) AMR/EFR/FR/HR speech coding Support GPRS class 12 Echo Cancellation (AEC)



Audio interface
§ § § § Two microphone inputs sharing one programmable low noise amplifier Two speech outputs with dedicate programmable power amplifier Stereo analog input and output Half-duplex hands-f