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SNV30019 发表于 19-4-28 08:40
胡说了一大堆居然还他妈有这么多人叫好！ GND LIFT一般是一个DI盒上的按钮 这个按钮按下去是断开输出端XLR ...
是我说的不够严谨，您说的也提醒到我有必要
把模拟地和电源地区别开，您说的是模拟信号的地，我说的是电源的地
LIFT不仅仅是DI盒子上的，还有电源滤波器上的（电源上不会有模拟信号地的）
YUIOO 发表于 19-4-28 09:30
机箱连根铁丝绑到暖气上 有什么 不好 麻烦 大佬 告知一下 本人 一直这么干 。。。
暖气静电严重 传导信号也不理想
0DreamER0 发表于 19-4-28 18:33
暖气静电严重 传导信号也不理想
额。。。机箱连根铁丝绑到暖气上 能不能 把机箱的电放到暖气上 手摸着 机箱 就是 有电的感觉 插声卡录吉他 也有电 怎么解决。。。
YUIOO 发表于 19-4-29 09:07
额。。。机箱连根铁丝绑到暖气上 能不能 把机箱的电放到暖气上 手摸着 机箱 就是 有电的感觉 插声卡录吉 ...
如果不接大地，建议别随便接线
翻墙文献
In sound recording and reproduction, ground lift or earth lift is a technique used to reduce or eliminate ground-related noise arising from ground loops in audio cables. It may also increase or decrease noise from other sources. Activating the ground lift on a particular piece of equipment opens the connection between the equipment ground and the shielding conductor of audio cables attached to the equipment, leaving those cables grounded only at their opposite end.
If all pieces of equipment are tied to a common ground reference without establishing ground loop, no current flows in the ground conductors and cable shields, and no noise is introduced into signal circuits. In applications such as sound reinforcement for a concert, however, it is difficult to ensure all equipment shares a common ground reference.
Professional audio equipment intended for use with balanced lines may have a ground lift switch for the cable shield. The ground lift switch eliminates unwanted hum and buzz by interrupting the ground loops between equipment, preventing current flow along the cable shield between two devices. The switch disconnects pin 1 on the XLR jack, which is connected to the braid or foil shield in the cable and acts as the ground point of the circuit.
Ground lifts do not conform to Audio Engineering Society standard AES48.
Specially wired signal adaptors may leave the shield connection disconnected, or connected to safety ground through an RF bypass capacitor. Isolation transformers may be used to convert from balanced lines to single-ended inputs, and also to isolate the cable shield from the equipment safety ground.
Removal of the safety ground connection on equipment can expose users to an increased danger of electric shock and may contradict wiring regulations. The safety ground is disconnected by an adaptor (cheater plug) in a power lead in which the ground conductor is deliberately disconnected, or by cutting a ground pin in the power plug. If a fault develops in any line-operated equipment, cable shields and equipment enclosures may become energized, creating an electric shock hazard. For example, the metal shell of a stage microphone or the strings of a guitar may become energized, creating a hazard to performers. (See Leslie Harvey, John Rostill, Keith Relf).
In sound recording and reproduction, ground lift or earth lift is a technique used to reduce or eliminate ground-related noise arising from ground loops in audio cables. It may also increase or decrease noise from other sources. Activating the ground lift on a particular piece of equipment opens the connection between the equipment ground and the shielding conductor of audio cables attached to the equipment, leaving those cables grounded only at their opposite end.
If all pieces of equipment are tied to a common ground reference without establishing ground loop, no current flows in the ground conductors and cable shields, and no noise is introduced into signal circuits. In applications such as sound reinforcement for a concert, however, it is difficult to ensure all equipment shares a common ground reference.
Professional audio equipment intended for use with balanced lines may have a ground lift switch for the cable shield. The ground lift switch eliminates unwanted hum and buzz by interrupting the ground loops between equipment, preventing current flow along the cable shield between two devices. The switch disconnects pin 1 on the XLR jack, which is connected to the braid or foil shield in the cable and acts as the ground point of the circuit.
Ground lifts do not conform to Audio Engineering Society standard AES48.
Specially wired signal adaptors may leave the shield connection disconnected, or connected to safety ground through an RF bypass capacitor. Isolation transformers may be used to convert from balanced lines to single-ended inputs, and also to isolate the cable shield from the equipment safety ground.
Removal of the safety ground connection on equipment can expose users to an increased danger of electric shock and may contradict wiring regulations. The safety ground is disconnected by an adaptor (cheater plug) in a power lead in which the ground conductor is deliberately disconnected, or by cutting a ground pin in the power plug. If a fault develops in any line-operated equipment, cable shields and equipment enclosures may become energized, creating an electric shock hazard. For example, the metal shell of a stage microphone or the strings of a guitar may become energized, creating a hazard to performers. (See Leslie Harvey, John Rostill, Keith Relf).
