upper frequency meaning in English
较高频率
上频率
Examples
- In testing upper frequency , lower frequency , and modulating frequency , the method of directly testing upper frequency and lower frequency then calculating carrier frequency is adopted
在测量移频信号的上、下边频及载波频率时，采用直接测量上、下边频，然后由上、下边频求中频载波的方法。 - The transmitter adopt qam modulation mode , which is a directly modulation upper frequency conversion mode , which could afford more high bit rate transmission in the same bandwidth compared to other modulation mode
发射机采用数字式调制方式,即qam直接调制上变频方式,相对于其它调制方式可以实现在相同带宽下的高码率传输。 - 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。 - The content of this theme is as follows : without time , without open , without stopping railway transport , and without interrupting traction current of block tested , meanwhile track circuit parameters in electrical and no electrical blocks is measured of on - line , dynamic and real - time . these parameters include voltage of fsk signal , voltage of industrial and harmonic wave interference , upper frequency , lower frequency , carrier frequency and low frequency 18 messages frequency
本课题研究内容：在不要点，不开天窗，不中断行车，不中断被测区段牵引电流的情况下，在线、动态、实时测量电化区段和非电化区段的移频信号电压、工频干扰电压，移频信号（调频信号）的上边频、下边频、载波频率、以及低频18信息频率等参数。 - Since the energy of 18 - information track signal is concentrated around upper frequency and lower frequency , the frequency of the modulation signal is low , and it must have high resolution , we use zfft to detect it . as the energy of um - 71 signal is more concentrated , we use extreme value method to detect the frequency of modulation signal in frequency domain , which can satisfy the frequency resolution
针对18信息轨道信号能量集中在上、下边频附近且低频信息频率低的情况,提出了用zoom - fft ( zoom指频率扩展或细化,简称zfft )算法进行信号的局部放大检测低频信息,以提高信号的频率分辨率,而um - 71轨道信号能量集中在载频附近,在频域上采用极值法检测低频信息,即可满足信号频率分辨率的要求。