1.報(bào)告廳音響傳聲器的調(diào)整
1. Adjustment of microphone in lecture hall
報(bào)告廳音響系統(tǒng)中同時(shí)使用的傳聲器一般情況下應(yīng)該是同相位的。在工程交付使用之前需將系統(tǒng)中所有傳聲器的相位都校正成同相的。在使用中由于特殊需要而要求將個(gè)別傳聲器接成反相位時(shí)，可利用調(diào)音臺(tái)上的相位倒置開關(guān)或者插入一段。反相線°。
The microphones used simultaneously in the sound system of the lecture hall should generally be in phase. Before the project is delivered for use, the phase of all microphones in the system shall be corrected to be in phase. When the individual microphone is required to be connected to the reverse phase due to special needs in use, the phase inversion switch on the mixer can be used or a section can be inserted. Reverse phase line °.
檢驗(yàn)傳聲器相位的方法很簡(jiǎn)單，若兩個(gè)傳聲器是同相位的，則這兩個(gè)傳聲器指向同一聲源時(shí)音量會(huì)明顯增加若兩個(gè)傳聲器是反相的，則這兩個(gè)傳聲器同時(shí)使用音量反而減小。調(diào)整時(shí)，可任選一個(gè)傳聲器作基準(zhǔn)，將系統(tǒng)中所有的傳聲器都與之比較，將相位與之相同的歸為一類，相位與之不同的歸為另·類。將為數(shù)較少的一類傳聲器的相位進(jìn)行調(diào)整，即把卡儂插接件上的2腳與3腳的接線互換，便可實(shí)現(xiàn)相位調(diào)整。
The method to check the microphone phase is very simple. If two microphones are in phase, the volume will increase significantly when the two microphones point to the same sound source. If the two microphones are in phase, the volume will decrease when the two microphones are used at the same time. During adjustment, any microphone can be selected as the reference, and all microphones in the system can be compared with it. Those with the same phase can be classified into one category, and those with different phase can be classified into another category. Adjust the phase of a small number of microphones, that is, interchange the wiring of 2 pins and 3 pins on the XLR connector to realize the phase adjustment.
2.報(bào)告廳音響房間均衡器的調(diào)整
2. Adjustment of the equalizer in the sound room of the lecture hall
房間均衡器··般要借助粉紅噪聲發(fā)生器和實(shí)時(shí)頻譜儀才能精確調(diào)整。報(bào)告廳音響房間均衡器主要用于對(duì)房間頻率特性進(jìn)行修正和補(bǔ)償。因此在調(diào)試時(shí)應(yīng)保證廳堂的環(huán)境與實(shí)際聽音環(huán)境的·致性，另外，房間均衡器的調(diào)整，有時(shí)需與音箱布局的調(diào)整結(jié)合起來。
The room equalizer can only be accurately adjusted with the help of pink noise generator and real-time spectrometer. The audio room equalizer in the lecture hall is mainly used to correct and compensate the room frequency characteristics. Therefore, during debugging, the consistency between the hall environment and the actual listening environment should be ensured. In addition, the adjustment of room equalizer sometimes needs to be combined with the adjustment of speaker layout.
報(bào)告廳音響房間均衡器是通過改變信號(hào)的頻率特性來實(shí)現(xiàn)對(duì)環(huán)境頻率特性的補(bǔ)償。對(duì)頻率特性的改變不可避免地會(huì)引致相位特性的改變，引起相位失真。當(dāng)房間均衡器的調(diào)整量過大時(shí)，尤其是在某段不寬的頻帶中又必須以很大的調(diào)整量才可達(dá)到均衡效果時(shí)，雖然房間的頻率特性被修正了，但因?yàn)橄辔皇д娴年P(guān)系，聽感會(huì)變得很差，對(duì)立體聲系統(tǒng)這種情況將更為突出。
The equalizer in the audio room of the lecture hall compensates the environmental frequency characteristics by changing the frequency characteristics of the signal. The change of frequency characteristics will inevitably lead to the change of phase characteristics and phase distortion. When the adjustment amount of the room equalizer is too large, especially in a narrow band, it must be adjusted with a large amount to achieve the equalization effect. Although the frequency characteristics of the room are corrected, the listening sense will become very poor due to the phase distortion, which will be more prominent for the stereo system.
在建聲條件不佳的情況下，房間均衡器的調(diào)整有時(shí)只能在頻率特性與聽感之間折中。強(qiáng)求頻率特性的平坦結(jié)果有時(shí)反而弄巧成拙。的辦法是改進(jìn)房間自身的聲學(xué)特性。
In the case of poor building sound conditions, the adjustment of room equalizer can sometimes only compromise between frequency characteristics and listening sensation. The flat result of forcing frequency characteristics is sometimes self defeating. The best way is to improve the acoustic characteristics of the room itself.
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