Controlling the impulse responses and the spatial variability in digital loudspeaker-room correction
This paper illustrates the main principles for loudspeaker compensation and compensation of the room acoustics that are used by Dirac Research and that have resulted in the technologies Dirac Live(R) for single-channel compensation and Dirac Unison for joint multi-channel compensation.A first main aim is to control not only the frequency domain properties of the system but also the time domain properties: The impulse responses as measured at different listening positions.In particular, we strive to reduce the ”pre-ringings” (pre-echoes) that would otherwise result in an un-natural sound experience.Secondly, we use dynamic models of the sound system that are based on measurements at multiple listening positions.This is important for obtaining a robust design that works over an extended region to provide a large spatial area with good sound quality.Third, we may jointly optimize multiple loudspeakers to better control the sound pressures at different listening positions.This is done by precise phase control of the individual loudspeaker transfer functions at low frequencies.Joint optimization of a set of loudspeakers results in more distinct bass performance, better robustness of the compensation and better control of the impulse responses at different listening positions.
Room compensation robust audio precompensation sound field control
Lars-Johan Br(a)nnmark Mikael Sternad
Dirac Research AB, Uppsala, Sweden Dirac Research AB and Uppsala University, Uppsala, Sweden
国内会议
第五届电声技术国际研讨会( International Symposium on ElectroAcoustic Technologies)(ISEAT 2015)
深圳
英文
126-141
2015-11-13（万方平台首次上网日期，不代表论文的发表时间）