Modulation is the process of loading low-frequency signals onto high-frequency carriers. ( )

Both AM and NBFM have same transmission bandwidth, they are linear modulation schemes.

‏Both AM and NBFM have same transmission bandwidth, they are linear modulation schemes. ‏

Separation may also be referred to as ________. A: caution B: protection C: modulation D: modification

The process of pulse coding modulation can be simply divided into two processes: sampling and coding.

Both AM and NBFM have same transmission bandwidth, they are linear modulation schemes. A: 正确 B: 错误

_______ is the name of the process of converting from analog to digital. A: Modulation B: Optical recognition C: Demodulation D: Virtualization

The simple high frequency sinusoidal wave which contains no information of its own is（ ） A: modulation B: general function C: carrier D: transmission

对光载波的调制按照是否干预光源驱动电流可以分为 The modulation of optical carrier can be divided according to whether or not to interfere with the driving current of light source

The analog and digital modulation types include ( ). A: PM, FSK, ASK, PSK, Sine B: Square, AM, FM, PM C: FSK, ASK, PSK, DC D: AM, FM, PM, FSK, ASK, PSK, DSB-AM