| 1. | Research on frequency - shift sending equipment with microcomputer
移频发送设备的电子化方案研究 |
| 2. | Afsk for audio frequency - shift keying
音频频移键控 |
| 3. | Study on the model of transmitting cable crosstalk in frequency - shift track circuit
移频轨道电路传输电缆串音模型的研究 |
| 4. | Fsk for frequency - shift keying
频移键控 |
| 5. | The practice of doppler frequency - shift signal extraction in ultrasonic blood flow detector
多普勒频移信号提取技术在超声血流检测中应用 |
| 6. | The optical sampling with frequency - shift , asynchronous optical sampling , and photonic analog to digital conversion based on time - interleave were investigated , included the theoretical analysis and experimental demonstration
建立了频差法光脉冲取样、异步光取样及基于时分光取样的光子模数转换实验装置。 |
| 7. | Because frequency - shift signal is a kind of modulation signal , it ' s waveform is two ac sine signal of alternating i . e . upper frequency and lower frequency which was generated by low frequency modulating middle frequency
由于移频信号是一种调频信号，其波形为低频信号调制中心载频信号后产生的低端载频（下边频）和高端载频（上边频）两个交替变化的正弦交流信号。 |
| 8. | The ministry of railway has developed two kinds of frequency - shift track circuits based on the primary 4 - information frequency - shift system : 18 - information frequency - shift auto - blocking track circuit made in china and um - 71 jointless track circuit made in france , and put them into use on some important lines . but at the mean while , the safety of running train becomes austerer and austerer
铁道部根据我国国情,在原有4信息移频制式的基础上,研制开发了两种移频轨道电路:国产18信息移频自动闭塞系统和法国um - 71无绝缘轨道电路系统,并将其应用到我国部分主要线路上。 |
| 9. | At the last we program the parameter detecting methods for frequency - shift track signal with c language and assembly language base on code composer studio of dsp . then we realize it on the dsp chip of tms320f2812 . experiments shows that it can satisfy the demand of real time and precision
最后在dsp的集成开发环境ccs ( codecomposerstudio )上采用c语言和汇编语言混合编写移频轨道信号的参数检测算法,并将该算法移植到dsp芯片( tms320f2812 )上实现,测试结果表明上述算法能够满足实时性和精度的要求。 |
| 10. | The actively and passive mode - locked fiber ring laser and two types of photonic switching , slalom ( semiconductor laser amplifier loop mirror ) and uni ( ultrafast nonlinear interferometer ) were developed . this thesis presented the principle and the requirements for the optical of frequency - shift sampling module under common conditions
研制了作为光取样脉冲源的主动锁模和被动锁模光纤激光器；半导体光放大器环镜及超高速非线性干涉仪的光子开关，并进行了频差法光取样、异步光取样及基于时分光取样的光子模数转换的实验研究。 |
