Research On Principles And Methods Of Sound Source Localization

Sound source localization technology has an important role and application value in engineering.Common sound source localization methods include sound source localization based on microphone array,sound source localization based on binaural hearing mechanism and sound source localization based on optical sensing.The sound source localization method based on the microphone array generally acquires sound signals of a plurality of positions through a microphone array of a specific structure combination,and then performs sound source localization by an acoustic processing algorithm.However,the microphone array used in this method is usually large in size,and the microphone units are also independent and not coupled to each other.At the same time,in order to obtain sufficient information,the number of microphone units is large.In addition,in order to ensure positioning accuracy,the spacing between the microphone units is also greater than a certain distance.In some special applications,such as hearing aids with sound source positioning or high-precision micro-small sonar,the microphone sensor is required to locate the sound source while miniaturizing.In addition,current sound source localization techniques generally require a microphone to acquire the sound signal at the location for sound source location.However,in some cases,the installation of a microphone,especially a large microphone array,may damage the integrity of the original device,resulting in a change in the inherent characteristics of the original device such as the modal frequency,which is sometimes not allowed.Therefore,research on sound source localization technology without microphone has important significance.In view of the above two issues,the main research of this paper is as follows:For the miniaturization of the microphone array,this paper proposes a bionic microphone array design based on circuit coupled.A method of replacing the mechanical coupled structure with a circuit coupled structure is proposed by the mechanical coupled structure of the fly Ormia ochracea.Then,the circuit coupled microphone array model proposed in this paper is used in the experiment,which realizes the goal of miniaturization of the microphone array while positioning the sound source.The sound source localization method can realize sound source localization in a case of a low frequency sound source(500 Hz)and a low microphone array radius(1.5 cm)by conveniently adjusting circuit coupled parameters.For the sound source localization without microphone,this paper proposes a sound source localization method based on video extraction object vibration.By shooting a subj ect that vibrates due to sound with a high-speed camera.The vibration signal of the object is then extracted from the video instead of the sound signal obtained by the microphone there.Then analyze the two vibration signals to locate the sound source.An algorithm for video extraction of vibration signals is proposed.The algorithm uses the decomposition of the controllable pyramid to efficiently extract the vibration signature signal.Then the experimental verification is carried out by this method,and the location of the sound source is realized,showing the reliability of the method.