不少單位的公共廣播總機房在大樓里，大樓每一層是直接接的功放。對于較遠的廠房，通過前置放大器放大，傳送到廠房里的功放。那么
山東公共廣播音響有電流聲什么原因呢？
The public address main machine room of many units is in the building, and each floor of the building is directly connected to the power amplifier. For the far plant, it is amplified by the preamplifier and transmitted to the power amplifier in the plant. So what is the reason for the current sound in Shandong public broadcasting?
1、屏蔽線問題，檢查屏蔽線質(zhì)量是否正常；
1. If there is a problem with the shielded wire, check whether the quality of the shielded wire is normal;
2、檢查機箱接地是否可靠；
2. Check whether the chassis is grounded reliably;
3、檢查各部件之間接線是否有松脫跡象；
3. Check whether the wiring between components is loose;
4、檢查電源供電是否正常。
4. Check whether the power supply is normal.
公共廣播系統(tǒng)屬于擴聲音響系統(tǒng)中的一個分支，而擴聲音響系統(tǒng)又稱音響系統(tǒng)涉及電聲、建聲和樂聲三種學(xué)科的邊緣科學(xué)。
The public address system belongs to a branch of the sound reinforcement system, and the sound reinforcement system, also known as the professional sound system, involves the edge science of three disciplines, namely, electro sound, building sound and musical sound.
所以公共廣播系統(tǒng)終效果涉及合理、正確的電聲系統(tǒng)設(shè)計和調(diào)試，良好的聲音傳播環(huán)境（建聲條件）和精確的現(xiàn)場調(diào)音三者佳的結(jié)合，三者相輔相成缺一不可。
Therefore, the final effect of the public address system involves the combination of reasonable and correct design and commissioning of the electro acoustic system, good sound transmission environment (sound building conditions) and accurate on-site tuning. The three are complementary and indispensable.
廣義的廣播系統(tǒng)包含擴聲系統(tǒng)和放聲系統(tǒng)兩大類：
In a broad sense, the broadcasting system includes two categories: sound reinforcement system and sound reproduction system:
1、擴聲系統(tǒng)：揚聲器與話筒處于同一聲場內(nèi)，存在聲反饋和房間共振引起的嘯叫，失真和振蕩現(xiàn)象。要保證系統(tǒng)穩(wěn)定和正常運行，高可用的系統(tǒng)增益比發(fā)生聲反饋自激的臨界增益低6dB。
1. Sound reinforcement system: the loudspeaker and microphone are in the same sound field, and there are howling, distortion and oscillation caused by acoustic feedback and room resonance. To ensure the stability and normal operation of the system, the highly available system gain is 6dB lower than the critical gain of acoustic feedback self excitation.
2、放聲系統(tǒng)：系統(tǒng)中只有磁帶機，光盤機等聲源，沒有話筒，不存在聲反饋可能，聲反饋系數(shù)為0，是廣播系統(tǒng)一個特例。
2. Sound reproducing system: there are only sound sources such as tape player and optical disc player in the system, and there is no microphone. There is no possibility of acoustic feedback. The acoustic feedback coefficient is 0, which is a special case of the broadcasting system.
What is the reason for the current sound in the public broadcasting system? The above content is the answer. If you have any questions about this, please come to our website http://www.zkvd.cn Consult and understand.
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