The DVI Adaptive Differential Pulse Code Modulation (ADPCM) algorithm was first described in an IMA recommendation on audio formats and conversion practices [1]. ADPCM is a transformation that encodes 16-bit audio as 4 bits (a 4:1 compression ratio).

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在手机设计方案中采用NFC架构和技术的实现方法-The use of mobile phone design in architecture and technology NFC Implementation

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