音响工程是汇集了多项学科知识的一项综合性工程，相位的问题则是音响工程中所包含的一个很小部分，但是它有着举足轻重的作用。下面来讲讲
山东音响中常见相位问题及解决方法吧。
Professional sound engineering is a comprehensive project that gathers knowledge of many disciplines. The phase problem is a small part of the sound engineering, but it plays an important role. Let's talk about the common phase problems and solutions in Shandong professional audio.
1、对于电路中的相位问题，目前国产测试有些设备可以直接地检测出线路中是否有反相问题。但不能整个电路连接好之后再测，如果中间有两条串接的线反相，则负负得正。所以电路中需要分段测量其相位。
1. For the phase problem in the circuit, some domestic testing equipment can directly detect whether there is phase problem in the circuit. However, it can not be tested after the whole circuit is connected. If there are two lines connected in series in the middle, the negative will be positive. Therefore, it is necessary to measure the phase in sections in the circuit.
2、音响系统的电源相位。
2. Power phase of the audio system.
如果一套音响系统中设备所采用的电源相位不一致，例如：功放用础相供电，调音台或周边用叠相供电，当设备消耗电功率程度不平衡时，相位高与低所产生的差异，会使某些设备电压高或低导致工作不正常,从而对整个系统带来一些不良的干扰，如：哼声、电流声等，也有可能会因为相位差异过大引起设备的损坏。
If the phase of the power supply used by the equipment in a set of audio system is inconsistent, for example, the power amplifier uses phase a for power supply, and the mixer or the surrounding uses phase B for power supply, when the power consumption of the equipment is unbalanced, the difference between the high and low phases will cause the high or low voltage of some equipment to cause abnormal operation, thus bringing some adverse interference to the whole system, such as hum, current sound, etc, There is also a possibility that the equipment may be damaged due to excessive phase difference.
解决方法：音响系统中好使用同相电源供电，或者础、叠、颁相电源供电尽量分配平衡，以免出现上述不良干扰。通常的做法都是用同相电源供电，因为要使础、叠、颁相电源供电平衡是件比较烦琐的事。
Solution: it is better to use the same phase power supply in the audio system, or the power supply of phase a, B and C shall be distributed and balanced as far as possible to avoid the above-mentioned adverse interference. The common practice is to use the same phase power supply, because it is rather cumbersome to balance the power supply of phase a, B and C.
3、音源拾音部份（话筒相位）。
3. The pickup part of the sound source (microphone phase).
话筒相位是指如果有多支话筒同时使用，有一支话筒反相，会导致整体拾音产生不平衡感。
Microphone phase refers to that if multiple microphones are used at the same time and one microphone is inverted, the overall pickup will be unbalanced.
拾音话筒接近者，会抵消信号，声音发闷，动态不足，有压抑感。而同相的二支话筒近距离一起拾音时，易造成信号重迭，加大正反馈的产生，从而产生自激（声反馈现象）。话筒相位反相的原因也有可能是话筒线插头焊掉了或者是焊接反了。出现反相后，要对话筒间相位做同一校正，使所有的话筒间输出信号相位保持同相状态。
If the microphone is close to the microphone, the signal will be canceled, the sound will be dull, the dynamic is insufficient, and there is a sense of depression. When two microphones in the same phase pick up sound together at close distance, it is easy to cause signal overlap and increase the generation of positive feedback, thus generating self excitation (acoustic feedback phenomenon). The reason for the microphone phase inversion may also be that the microphone cable plug is welded off or welded inversely. After inversion occurs, the phase between microphones shall be corrected in the same way to keep the phase of all output signals between microphones in the same phase.
解决方法：
resolvent:
（1）在多只话筒中，先确定一只真实相位相同的话筒，将这只话筒作为基准话筒。一般来说，在所有音箱之间为同相关系的情况下，同一型号话筒中拾音效果相对好的那只话筒肯定是真实相位同相。
(1) Among multiple microphones, first determine a microphone with the same real phase and use this microphone as the reference microphone. Generally speaking, when all speakers are in phase, the microphone with relatively good sound pickup effect in the same model must be in phase.
确定了真实相位同相后，将被检查话筒与基准话筒的头部紧靠在一起，用话筒拾取同一声音，输出音量声源音量增加而增加的为同相，否则被检查话筒为反相。重复以上步骤，就可以检查出所有的反相话筒。
After the true phase is determined to be in phase, the microphone to be inspected and the head of the reference microphone shall be close together, and the same sound shall be picked up by the microphone. The increase of the output volume due to the increase of the sound source volume is in phase, otherwise the microphone to be inspected is in phase. Repeat the above steps to check all inverting microphones.
（2）对于反相话筒，有两种解决方法：一是打开反相话筒线卡侬插头，将卡侬插头的2、3端对调；二是如果调音台设有倒相键，可将反相话筒信号输入路的倒相键按下，相位就调换过来了。
(2) For inverted microphones, there are two solutions: one is to open the XLR plug of the inverted microphone line and switch the 2 and 3 ends of the XLR plug; Second, if the mixer is provided with an inverting key, the inverting key of the inverted microphone signal input channel can be pressed, and the phase will be reversed.
音响工程的相位所产生相位差的原因是多种多样的，所以我们在做音响过程中应考虑到产物的选型，焊接工艺要求，系统连接方式，调试检测等问题。更多内容就来我们网站
咨询了解吧。
There are various reasons for the phase difference caused by the phase of professional audio engineering, so we should consider the selection of products, welding process requirements, system connection mode, commissioning and testing in the process of making audio. Come to our website for more information Consult and understand.
