To the 90's, a complex digital modulation with the rapid development of communication technology, testing signal mainly based digital modulation signals.
到了90年代，复杂的数字调制加上通信技术的迅猛发展，测试信号主要以数字调制信号为主。
The algorithm is verified by experiments and the modulator can produce digital modulation signals with good EVM(Error Vector Magnitude) and spectrum mask.
通过验证，所产生的调制信号具有良好的误差向量幅度（EVM）和频谱特征。
Aiming at the spectrum spread problem of traditional digital modulation signals, a time-phase modulation (TPM) method with abrupt phase change characteristic is proposed.
针对传统数字调制信号频谱扩展问题，提出具有相位突变特性的时相调制(TPM)方式。
In the scheme, a set of feature parameters are extracted from signal spectrum and constellation based on the differences between digital mixed signals and common digital modulation signals.
该方案利用数字混合信号与常用数字调制信号在信号频谱以及星座点的差异提取特征参数进行自动识别。
Then, the paper introduces the math module and achieving method of software modulation and demodulation of common digital modulating signals used in telecontrol & telemetry system.
接着介绍了遥控遥测常用的数字调制信号的软件调制解调的数学模型和实现方法。
Based on the characteristic extracting of RF signal in digital cable TV system, this paper puts forward an algorithm for modulation recognition between 16qam and 64qam RF signals.
从有线数字电视射频信号特征参数提取着手，建立了一套识别16QAM和64 QAM射频信号调制方式的数学算法。
Quadrature Amplitude Modulation (QAM) is used to transfer signals by digital TV system based on DVB_C standard.
基于DVB_C标准的数字电视系统采用正交幅度调制(QAM)传送信号。
The in-pulse features of radar signals are extracted by the digital IF technology, and the modulation forms of radar signals are identified according to the in-pulse feature parameters.
介绍了通过数字中频技术提取雷达信号脉内特征，并根据脉内特征参数对雷达信号调制形式进行识别。
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.
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（2DPSK）作为数字调制方式。
Studied the modulation identification problem of digital modulated signals, successfully identified 2ask, 2fsk, 2psk, 4ask and 4fsk signals.
深入研究了数字调制信号的调制制式的识别问题，成功识别了2ask、2fsk、2psk、4ask和4fsk五种数字调制信号。
The principle of converting analog signals to digital signals bacame popular with the introduction of pulse code modulation ;
随着脉冲编码调制技术的出现，把模拟信号转换为数字信号的原理得到广泛应用；
The principle of converting analog signals to digital signals bacame popular with the introduction of pulse code modulation ;
随着脉冲编码调制技术的出现，把模拟信号转换为数字信号的原理得到广泛应用；
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