以 PC机为主控单元 ,研制了半导体激光器噪声测试系统 ,通过 PC机对频谱分析仪的远程控制 ,完成对器件噪声信号的自动采集和处理。用该系统对 In P/ In Ga As PV双异质结半导体激光器的电噪声和电阻的热噪声进行了测量。实验结果表明 ,...以 PC机为主控单元 ,研制了半导体激光器噪声测试系统 ,通过 PC机对频谱分析仪的远程控制 ,完成对器件噪声信号的自动采集和处理。用该系统对 In P/ In Ga As PV双异质结半导体激光器的电噪声和电阻的热噪声进行了测量。实验结果表明 ,该系统可重复性好 。展开更多
In order to solve the problem of code error in the out-trunk pulse-repeater of electromechanical switching system, a new kind of signal transmitting system designed with computer technique is introduced. It can conver...In order to solve the problem of code error in the out-trunk pulse-repeater of electromechanical switching system, a new kind of signal transmitting system designed with computer technique is introduced. It can converts signal pulses transmitting from the electromechanical switch-board out-trunk into DTMF (Duration Time Modulation Frequency) signal. Statistical result for one-year operation in about one hundred users in Nanyang city shows that the new technique has raised the telephone correct connection rate from 70 percent to 98 percent or more.展开更多
文摘In order to solve the problem of code error in the out-trunk pulse-repeater of electromechanical switching system, a new kind of signal transmitting system designed with computer technique is introduced. It can converts signal pulses transmitting from the electromechanical switch-board out-trunk into DTMF (Duration Time Modulation Frequency) signal. Statistical result for one-year operation in about one hundred users in Nanyang city shows that the new technique has raised the telephone correct connection rate from 70 percent to 98 percent or more.