论文部分内容阅读
用录音机转录时,为了使强信号录音机失真小,必须加接一只衰减器,其衰减量应根据信号强弱及录音输入的电平要求而定,同时还要考虑阻抗匹配。一般录音机线路输入插口要求的电平约为100 mV,当信号电压为1 V时,则需衰减10倍;如果用话筒输入插口录音,仅需1 mV左右,则需衰减1000倍。附图是按以上两种比例设计的衰减器,1为信号输入端,2为高电平输出端,3为低电平输出端,R_1
When transcribing with the recorder, in order to make the distortion of the strong signal recorder small, an attenuator must be added. The attenuation should be based on the signal strength and the level requirement of the recording input, and the impedance matching should also be considered. The normal line level of the recorder input jack is about 100 mV. If the signal voltage is 1 V, it needs to be decayed 10 times. If the microphone input jack is used for recording, only 1 mV or so is required, and it needs to be attenuated by 1000 times. Figure is based on the above two kinds of attenuator design, 1 for the signal input, 2 for the high-level output, low-level output 3, R_1