GY/T 139-1999.Specifications and methods of measurement on demodulator used in CATV systems. 调整衰减器A1,使被测解调器的输入电平为其标称输入电平。标准调制器的V / A比置为10dB,调制度置为80%。视

GY/T 139-1999.Specifications and methods of measurement on demodulator used in CATV systems. 调整衰减器A1,使被测解调器的输入电平为其标称输入电平。标准调制器的V / A比置为10dB,调制度置为80%。视

GY/T 139-1999.Specifications and methods of measurement on demodulator used in CATV systems. 调整衰减器A1,使被测解调器的输入电平为其标称输入电平。标准调制器的V / A比置为10dB,调制度置为80%。视

GY/T 139-1999.Specifications and methods of measurement on demodulator used in CATV systems. 调整衰减器A1,使被测解调器的输入电平为其标称输入电平。标准调制器的V / A比置为10dB,调制度置为80%。视

GY/T 139-1999.Specifications and methods of measurement on demodulator used in CATV systems. 调整衰减器A1,使被测解调器的输入电平为其标称输入电平。标准调制器的V / A比置为10dB,调制度置为80%。视

GY/T 134一1998The method for the subjective assessment of the quality of digital television picture. 1. 范围 GY/T 134规定了数字电视图像质量的主观评价方法. GY/T 134适用于对数字电视

GY/T 135 - 1998.Specifications and methods of measurement on coaxial cable with physically-foamed polyethylene insulation used in CATV systems. 1范围 GY

GY/T 136-1998.Specifications and methods of measurement on coaxial cable with bamboo type polyethylene insulation used in CATV systems. 1范團 GY/T 136规定

GY/T 129-1997.Technical specification for Transmission of two-channel Digital Sound with Broadcasting Television System PALD. 1范围 GY/T 129规定了PAL- _D制电

GY/T 129-1997.Technical specification for Transmission of two-channel Digital Sound with Broadcasting Television System PALD. 1范围 GY/T 129规定了PAL- _D制电