PROBLEM TO BE SOLVED: To provide an efficient system having a diversity of functions for infrared communication by providing a flush modulating means which selectively generates pulses having pulse widths narrower than a specific value in response to FM coded signals in the first and second halves ...
PLL-FM-Demodulator PLL-FM demodulator A wide-spread test of the PLL FM demodulator under Gaussian modulation is simulated in consideration of additive noise and FM interference using the Monte Carlo method. The modulating Gaussian random signals are simulated by sums of sine... P Mellot 被引量:...
The diagram below illustrates the FM modulation and demodulation process. The red line at the top shows an audio input signal, which modulates the purple signal: when the input is higher, the purple signal has a higher frequency. The FM purple signal is transmitted to the spacecraft. To ...
And then the DPSK modulation signal FM modulation, and finally get dual modulation signal. 解调模块首先对接收到的信号进行下边频和抽取处理,而后对降低速率的信号进行FM解调,节省硬件资源. Demodulation module first received signal frequency is lower and the extraction process, then reduce the rate of the...
Gated IF AGC acting on black level by using H/V PLL or peak IF AGC (I2C-bus selectable) Internal digital logarithmic IF AGC amplifier with up to 48 dB gain and 68 dB control range Peak search tuner IF AGC for optimal adaptive drive of the IF ADC ...
[^10]: Amplitude and phase-shift keying - Wikipedia [^11]: 正交(IQ)调制解调与希尔伯特变换 - 你是下雨天 (glooow1024.github.io) [^12]: Understanding I/Q Signals and Quadrature Modulation [^13]: Understanding Quadrature Demodulation [^14]: Minimum-shift keying - Wikipedia [^15]: Minimum ...
Compared with analog technology, digital technology can improve the low frequency response of PLL-FM circuit. The stability, flexibility and transmission efficiency of system can be improved by using digital technology too. The design of PCM/FM modulation module based on DSP, direct waveform ...
信号和通讯系统PPT-FM TX和RX FM Transmitters and Receivers
The present invention, which belongs to the communication field, relates to a method for semiduplex FM/Chirp modulation/demodulation and an apparatus for implementing the method. The method for modulation/demodulation includes that corresponding pretreatments are performed on a Chirp pulse carrier output...
United States Application US20100232548 Note: If you have problems viewing the PDF, please make sure you have the latest version ofAdobe Acrobat. Back to full text