公开(公告)号：US09660849B2

公开(公告)日：2017-05-23

申请号：US14867014

申请日：2015-09-28

申请人： Freescale Semiconductor, Inc.

发明人： Zhiling Sui ,  Zhijun Chen ,  Zhihong Cheng ,  Jiangtao Pan

IPC分类号： H04B7/02 ,  H03F3/45 ,  H04L27/156 ,  H04W56/00 ,  H04L7/00 ,  H04L27/16

CPC分类号： H04L27/1563 ,  H04L7/0087 ,  H04L27/16 ,  H04W56/0045

摘要： A method of demodulating an FSK modulated input signal whose frequency varies between first and second frequencies. The input signal is delayed by a plurality of cycles, providing a second signal. A succession of phase reference signals having respective incrementally greater phase delays relative to the input signal are provided. Samples of the phase reference signals are taken at intervals determined by the second signal. A transition between the first and second frequencies is detected when the relative values of the samples of the phase reference signals remain constant during a plurality of intervals after varying. A high speed clock is not required to perform the demodulation.

公开(公告)号：US09893771B2

公开(公告)日：2018-02-13

申请号：US15235081

申请日：2016-08-11

申请人： FREESCALE SEMICONDUCTOR, INC.

发明人： Zhiling Sui ,  Zhijun Chen ,  Zhihong Cheng ,  SHixiang Nie

IPC分类号： H04L27/148 ,  H04B5/00

CPC分类号： H04B5/0075 ,  H04B5/0031 ,  H04B5/0037 ,  H04L27/148

摘要： A frequency shift keying (FSK) demodulation component having of a sampler that receives an FSK modulated signal, samples the received FSK modulated signal, and outputs the sampled signal. The FSK demodulation component further includes a low pass filter that filters the sampled signal, and a frequency shift detector that detects shifts in frequency of the low pass filtered sampled signal. The FSK demodulation component then outputs an indication of the detection of shifts in frequency of the low pass filtered sampled signal.

公开(公告)号：US20160285658A1

公开(公告)日：2016-09-29

申请号：US14867014

申请日：2015-09-28

申请人： Freescale Semiconductor, Inc.

发明人： Zhiling Sui ,  Zhijun Chen ,  Zhihong Cheng ,  Jiangtao Pan

IPC分类号： H04L27/156 ,  H04L7/00 ,  H04W56/00

CPC分类号： H04L27/1563 ,  H04L7/0087 ,  H04L27/16 ,  H04W56/0045

摘要： A method of demodulating an FSK modulated input signal whose frequency varies between first and second frequencies. The input signal is delayed by a plurality of cycles, providing a second signal. A succession of phase reference signals having respective incrementally greater phase delays relative to the input signal are provided. Samples of the phase reference signals are taken at intervals determined by the second signal. A transition between the first and second frequencies is detected when the relative values of the samples of the phase reference signals remain constant during a plurality of intervals after varying. A high speed clock is not required to perform the demodulation.

摘要翻译： 解调频率在第一和第二频率之间变化的FSK调制输入信号的方法。 输入信号被延迟多个周期，提供第二信号。 提供了一系列相位参考信号，其相对于输入信号具有相应的逐渐增大的相位延迟。 相位参考信号的采样以由第二信号确定的间隔进行。 当相位参考信号的样本的相对值在变化后的多个间隔期间保持恒定时，检测第一和第二频率之间的转变。 不需要高速时钟进行解调。