设数字码序列为0110100,以下数字调制的已调信号波形中为2ASK波形的是( )
A: [img=506x245]180322bf7f356d4.jpg[/img]
B: [img=510x244]180322bf90c3b87.png[/img]
C: [img=494x233]180322bf9dca5dc.jpg[/img]
D: [img=496x248]180322bfab44ee3.jpg[/img]
A: [img=506x245]180322bf7f356d4.jpg[/img]
B: [img=510x244]180322bf90c3b87.png[/img]
C: [img=494x233]180322bf9dca5dc.jpg[/img]
D: [img=496x248]180322bfab44ee3.jpg[/img]
举一反三
- 设数字码序列为0110100,以下数字调制的已调信号波形中为2ASK波形的是( ) A: [img=506x245]1803d9ac525a9dd.jpg[/img] B: [img=510x244]1803d9ac62bc992.png[/img] C: [img=494x233]1803d9ac707ac79.jpg[/img] D: [img=496x248]1803d9ac7d4e374.jpg[/img]
- 设数字码序列为0110100,以下数字调制的已调信号波形中为2ASK波形的是(
- 设[img=127x53]17f1b3d6db98b83.jpg[/img],f(x)=arctanΧ,则[img=56x55]17f1b3d82842941.jpg[/img]=()。 A: π B: 3π/4 C: -3π/4 D: 2π
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