binary delta modulation
... delta modulation code 增量调制编码 binary delta modulation 二进制增量调制 CDM Code Delta Modulation 代码三角调制 ...
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设计出了二次调制系统：采用连续可变斜率增量调制（ CV SD）实现模拟话音信号与数字编码的转换，采用二进制相对相移键控（2 DPSK）作为数字调制方式。
A twice modulation is designed:, CVSD was adopted to realize conversion between analog and digital voice signals, 2DPSK was used as the digital modulation mode.
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