Preliminary Study On Stage Evaluation Index Of Mutual Hearing In Concert Hall

A good hearing of others is a prerequisite for the orchestra musicians to accurately grasp their own vocal quality and the coordination of the orchestra's overall performance.It is also a premise to inspire emotional performance and pass the best musical effects to the audience.Among the existing stage acoustic parameters,only STearly,STlate and STtotal are widely recognized.But it seems that ST describe the self-monitoring situation on the stage according to their definition and measurement methods.Currently,there are no recognized acoustic parameters for evaluating the mutual hearing on stage.This article describes the research course of the stage acoustic,and analyzes the importance of the hearing of others on stage by analyzing the sound field characteristics of the orchestra,as well as clarifies the connection and difference between the hearing of others and the hearing of self.Domestic and foreign research progress and achievements on the parameters of stage acoustics are summarized.On this basis,combined with subjective research and sound field analysis,G50,G80 and G80-1000 were used to evaluate the mutual hearing on stage.By measuring in a scale reverberation chamber,the scale model material corresponding to the sound absorption of the full-scale musician and seat was found,and a small,stability and repeatability omnidirectional sound sources for the 1:10 scale model was developed.Then,in the 1:10 scale model,taking the command position as the receive point,the impulse response signals from eight different sound source positions on the stage under the two conditions are measured.and Dirac and Matlab are utilized.By using Dirac and Matlab,the G50,G80,and G80-1000 on the stage and analyzed.The results show that both G20 and G80 can reflect the changes of the early sound energy with the position of the sound source,and the two are highly correlated.The G80-1000 characterizing the later sound energy is affected by the position of the measured point slighter.The musicians and seats on the stage have obvious obstruction and absorption of sound,which affects each other.The full field G80 and G50 values that characterize the early acoustic energy are 0.5-4 dB smaller than in the empty field,and vary greatly depending on the position of the measuring point.However,the G80-1000 is less affected by measuring point,and the full field value is 1.45 dB smaller than in the empty field.