Wednesday, February 21, 2024
Friday, April 5, 2024
问题:设调制信号的频率为1kHz,载波的频率为700kHz,问调幅波的频谱中有哪些频率分量?...
Thursday, February 22, 2024
Friday, April 5, 2024
Saturday, April 13, 2024
Saturday, April 13, 2024
问题:声波的周期和波长有何关系?假设有一频率为1000Hz的声音,当它在空气中传播时,其波长为多少米(空气中的声速为344米/秒)?...
Saturday, April 13, 2024
Friday, April 5, 2024
Saturday, April 13, 2024
问题:在标准清晰度电视系统中,采用4:1:1编码方式、10比特量化时,亮度和色差信号的总数码率为多少?...
Saturday, April 13, 2024
Saturday, April 13, 2024
Thursday, March 14, 2024
Friday, April 5, 2024
问题:声波的周期和波长有何关系?假设有一频率为1000Hz的声音,当它在空气中传播时,其波长为多少米(空气中的声速为344米/秒)?...
Saturday, April 13, 2024
问题:调制指的是什么?广播节目信号发射前为何要进行调制?...
Saturday, April 13, 2024
Saturday, April 13, 2024
Saturday, April 13, 2024
Saturday, April 13, 2024
Saturday, April 13, 2024
问题:设声音信号的取样频率为32kHz,量化比特数为16bit,则数字化后该声音信号的数码率为多少?...
Saturday, April 13, 2024