更新時(shí)間：2022-08-31
文章來(lái)源：http://www.djfrj.net.cn/
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會(huì )議室分會(huì )場(chǎng)的音響設備包括會(huì )議終端及相關(guān)外部設備，設備種類(lèi)及功能大同小異。下面來(lái)講講常見(jiàn)
會(huì )議音響系統中出現的噪音與干擾處理。
The audio equipment of the conference room and sub venues includes conference terminals and related external equipment, and the equipment types and functions are similar. Let's talk about the noise and interference processing in common conference audio systems.
1、噪聲大。它影響聲音的清晰度、柔和度和明亮度，嚴重時(shí)會(huì )掩蓋了會(huì )場(chǎng)的聲音。
1. The noise is large. It affects the clarity, softness and brightness of the sound, and in serious cases, it will cover up the sound of the meeting place.
本底噪聲。由于增益過(guò)大、采用自動(dòng)增益控制方式、阻抗不匹配等，都會(huì )出現本底噪聲。
Background noise. Background noise will occur due to excessive gain, automatic gain control, impedance mismatch, etc.
麥克風(fēng)“撲”聲。麥克風(fēng)是擴音系統的個(gè)環(huán)節，其信號質(zhì)量的好壞直接影響到整個(gè)會(huì )議效果，因此要根據其特點(diǎn)和性能、聲源重現的特征以及各聲源之間的相對關(guān)系合理選擇和設置。對于破音較強的發(fā)言者，應選用防“撲”聲的麥克風(fēng)。
The microphone "pours". The microphone is the first link of the public address system. Its signal quality directly affects the whole conference effect. Therefore, it should be reasonably selected and set according to its characteristics and performance, the characteristics of sound source reproduction and the relative relationship between various sound sources. For speakers with strong breaking sound, microphones with anti "flapping" sound shall be selected.
2失真大。它與設備的非線(xiàn)性失真和人為因素有關(guān)。其特征是聲音嘶啞、破損、尖細刺耳，嚴重時(shí)會(huì )影響聲音的清晰度、柔和度、明亮度、豐滿(mǎn)度和現場(chǎng)感。引起失真的原因是多方面的，如麥克風(fēng)的靈敏度過(guò)高、擺放位置不合適、具有幻像電源的麥克風(fēng)供電不正常、調音臺的電平調整過(guò)大、均衡器的調整不適當、設備之間的阻抗不匹配等。
2 large distortion. It is related to the nonlinear distortion of equipment and human factors. It is characterized by hoarseness, damage and sharp and harsh sound. In serious cases, it will affect the clarity, softness, brightness, fullness and sense of presence of the sound. There are many reasons for distortion, such as high sensitivity of microphones, improper placement, abnormal power supply of microphones with phantom power supply, excessive level adjustment of mixer, improper adjustment of equalizers, and impedance mismatch between devices.
3、電平不規范。在調試之前沒(méi)有對調音臺、均衡器等設備進(jìn)行調校，造成信號電平過(guò)高或過(guò)低。另外，將不平衡的線(xiàn)路輸出與平衡的線(xiàn)路輸入直接連接，造成信號電平下降。
3. The level is not standard. Before commissioning, the mixer, equalizer and other equipment were not adjusted, resulting in high or low signal level. In addition, the unbalanced line output is directly connected to the balanced line input, causing the signal level to drop.
4、頻響不均勻。它與設備的頻響指標和人為因素有關(guān)，如麥克風(fēng)的指向偏離聲源、中頻和低頻衰減太多、麥克風(fēng)傳輸線(xiàn)過(guò)長(cháng)等，都將影響聲音還原的清晰度、層次感、豐滿(mǎn)度。
4. The frequency response is uneven. It is related to the frequency response index of the equipment and human factors, such as the direction of the microphone deviates from the sound source, too much attenuation of the medium and low frequencies, and the microphone transmission line is too long, which will affect the clarity, layering and fullness of the sound restoration.
5、聲音比例失調。如果總控室、主會(huì )場(chǎng)、發(fā)言的分會(huì )場(chǎng)三者之間的聲音比例失調，就會(huì )影響其他分會(huì )場(chǎng)還原遠程聲音的平衡度，造成會(huì )議的整體效果下降。
5. The sound is out of proportion. If the proportion of voices among the main control room, the main venue and the branch venues where the speeches are made is out of proportion, it will affect the balance of the remote voice restored by other branch venues and cause the overall effect of the meeting to decline.
縱觀(guān)大部分會(huì )議系統例行調試和召開(kāi)會(huì )議，聲音還原的質(zhì)量有了明顯的提高，但還是有很多會(huì )議室音響設備還存在問(wèn)題，主要表現為噪聲大、失真大等問(wèn)題，您對此可以來(lái)了解了解
http://www.djfrj.net.cn。
Throughout the routine debugging of most conference systems and the holding of meetings, the quality of sound reproduction has been significantly improved. However, there are still problems with the audio equipment in many conference rooms, mainly including large noise and distortion. You can learn about this http://www.djfrj.net.cn 。
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