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本文叙述利用因数n的频带压缩和扩张的电子方法以及机电方法.两种方法都是把原来信号调制成载波,按需要进行分频和倍频,然后按需要再生所需信号.在倍频和分频时,采用线性放大的方法,以防止信号失真.电子方法中根据单边带调制的要求使用调幅系统,再生所需信号.机电方法中采用旋转频率的调频系统.在频带压缩和扩张系统中电子方法也可以采用不同于单边带调幅的载波频系统.
This article describes the use of the frequency band factor n compression and expansion of the electronic method and the mechanical and electrical methods.Either way is to modulate the original signal carrier, according to the needs of the frequency and frequency multiplication, and then regenerate the desired signal as needed.In the multiplier and Frequency division, the use of linear amplification method to prevent signal distortion.According to the single-sideband modulation requirements of the use of amplitude modulation system, the regeneration of the desired signal.Machine and motor methods using the rotating frequency of the FM system.In the band compression and expansion system The electronic method can also adopt a carrier frequency system different from the one-sideband amplitude modulation.