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音響工程是匯集了多項(xiàng)學(xué)科知識(shí)的一項(xiàng)綜合性工程，相位的問(wèn)題則是音響工程中所包含的一個(gè)很小部分，但是它有著舉足輕重的作用。下面來(lái)講講山東音響中常見(jiàn)相位問(wèn)題及解決方法吧。

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、對(duì)于電路中的相位問(wèn)題，目前國(guó)產(chǎn)測(cè)試有些設(shè)備可以直接地檢測(cè)出線路中是否有反相問(wèn)題。但不能整個(gè)電路連接好之后再測(cè)，如果中間有兩條串接的線反相，則負(fù)負(fù)得正。所以電路中需要分段測(cè)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、音響系統(tǒng)的電源相位。

2. Power phase of the audio system.

如果一套音響系統(tǒng)中設(shè)備所采用的電源相位不一致，例如：功放用A相供電，調(diào)音臺(tái)或周邊用B相供電，當(dāng)設(shè)備消耗電功率程度不平衡時(shí)，相位高與低所產(chǎn)生的差異，會(huì)使某些設(shè)備電壓高或低導(dǎo)致工作不正常,從而對(duì)整個(gè)系統(tǒng)帶來(lái)一些不良的干擾，如：哼聲、電流聲等，也有可能會(huì)因?yàn)橄辔徊町愡^(guò)大引起設(shè)備的損壞。

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.

解決方法：音響系統(tǒng)中好使用同相電源供電，或者A、B、C相電源供電盡量分配平衡，以免出現(xiàn)上述不良干擾。通常的做法都是用同相電源供電，因?yàn)橐笰、B、C相電源供電平衡是件比較煩瑣的事。

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（話筒相位）。

3. The pickup part of the sound source (microphone phase).

話筒相位是指如果有多支話筒同時(shí)使用，有一支話筒反相，會(huì)導(dǎo)致整體拾音產(chǎn)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.

拾音話筒接近者，會(huì)抵消信號(hào)，聲音發(fā)悶，動(dòng)態(tài)不足，有壓抑感。而同相的二支話筒近距離一起拾音時(shí)，易造成信號(hào)重疊，加大正反饋的產(chǎn)生，從而產(chǎn)生自激（聲反饋現(xiàn)象）。話筒相位反相的原因也有可能是話筒線插頭焊掉了或者是焊接反了。出現(xiàn)反相后，要對(duì)話筒間相位做同一校正，使所有的話筒間輸出信號(hào)相位保持同相狀態(tài)。

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.

解決方法：

resolvent:

（1）在多只話筒中，先確定一只真實(shí)相位相同的話筒，將這只話筒作為基準(zhǔn)話筒。一般來(lái)說(shuō)，在所有音箱之間為同相關(guān)系的情況下，同一型號(hào)話筒中拾音效果相對(duì)好的那只話筒肯定是真實(shí)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.

確定了真實(shí)相位同相后，將被檢查話筒與基準(zhǔn)話筒的頭部緊靠在一起，用話筒拾取同一聲音，輸出音量聲源音量增加而增加的為同相，否則被檢查話筒為反相。重復(fù)以上步驟，就可以檢查出所有的反相話筒。

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）對(duì)于反相話筒，有兩種解決方法：一是打開(kāi)反相話筒線卡儂插頭，將卡儂插頭的2、3端對(duì)調(diào)；二是如果調(diào)音臺(tái)設(shè)有倒相鍵，可將反相話筒信號(hào)輸入路的倒相鍵按下，相位就調(diào)換過(guò)來(lái)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.

音響工程的相位所產(chǎn)生相位差的原因是多種多樣的，所以我們?cè)谧鲆繇戇^(guò)程中應(yīng)考慮到產(chǎn)品的選型，焊接工藝要求，系統(tǒng)連接方式，調(diào)試檢測(cè)等問(wèn)題。更多內(nèi)容就來(lái)我們網(wǎng)站http://www.zkvd.cn咨詢了解吧。

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 http://www.zkvd.cn Consult and understand.