Research And Implementation Of Surround Sound Signal Detection System Based On Sound Reflection

Standard 5.1 channel surround sound system needs so many speakers that it is limited by the living space and conditions in practical applications.Virtual surround sound technology can also simulate the effect of surround sound to a certain extent by just two speakers,but the listening area of this method is so narrow that we can hear obvious surround effect only sit in the in the central axis of two speakers.With the surround sound reproduction technology based on sound reflection,surround sound is reflected to the listener through the room's interface.Although the sound localization is not accurate enough,it can expand the listening area and make the sound distortion smaller.Surround sound signal detection system is a key part of surround sound reproduction technology based on sound reflection.In this paper,the surround sound signal is positioned by the characteristic analysis of the sound field surround sound signal,and the speaker is automatically adjusted to the angle of the best surround sound effect.First,designing the speaker angle control module.The speaker angle is controlled by controlling the rotation angle of the stepper motor with the stepper motor as a carrier.Next,in order to obtain the experimental data of the surround sound signal characteristic analysis,the binaural signals were collected from the dummy head made of silica gel.The experiment was carried out in three different positions,and three groups of binaural signals were collected successfully.Then,analyzing the three sets of binaural signals in Interaural Correlation,Interaural Time Difference and Interaural Amplitude Difference.The result shows that:(1)When the threshold is 15%,the value of Interaural Time Difference of surround sound signals is maximum in each group;(2)The value of Interaural Correlations of the impulse responses of surround signals is minimal in each group;(3)the value of Interaural Amplitude Difference of surround sound signals is maximum in each group;Since the calculation of Interaural Amplitude Difference is the smallest,Interaural Amplitude Difference is selected as the characteristic of the surround sound signal to be applied to the system.Finally,the implementation of the surround sound signal detection system will use that the value of Interaural Amplitude Difference is maxinmum as a criterion for the determination of the surround sound signal.When the system detects the angle of this characteristic,the speaker will rotate to the angle to realize the surround sound effect.