A kind of headphone signal feeding method for meeting

Abstract

The invention discloses a method for feeding earphone signals for conferences, which includes: obtaining the spatial parameters of the target area, and calculating the average sound absorption coefficient of the target area according to the spatial parameters; establishing a rectangular coordinate system of the target area, and Mark the coordinate parameters of speaking seats and audience seats in the Cartesian coordinate system, calculate the relative angle of each audience seat relative to the speaking seats; obtain the direct sound HRIR data of the speech seat direction horizontal plane, and obtain the reflected sound HRIR data of the horizontal plane; Select the corresponding direct sound HRIR data and reflected sound HRIR data of each audience seat relative to the relative angle of the speaking seat, and calculate the binaural sound signal under static conditions in combination with the average sound absorption coefficient of the target area; After updating the relative angle of each audience seat relative to the speaking seat, the angle change value selects the corresponding direct sound HRIR data and reflected sound HRIR data, and calculates binaural sound signals under dynamic conditions in combination with the average sound absorption coefficient of the target area.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a method for feeding earphone signals used in conferences. Background technique [0002] The meeting room is a language-based acoustic place, used for conferences, academic reports, learning and training, etc. It is required that the language clarity is high enough, and the direction of the audio image perceived by the audience is consistent with the direction of the speaker. Since the voice of the speaker attenuates as the distance increases in the conference room, in order to ensure that each auditorium in the conference room has a high enough sound pressure level, most conference rooms install a sound reinforcement system to improve the auditorium. sound pressure level. But there are also occasions where the voice of the speaker is played through the earphones worn by the audience, or the speech content of the speaker is translated into other languages ​​and then pl...

AI Technical Summary

Problems solved by technology

[0017] (1) In the existing conferencing system, when the audio signal is played back by headphones, the mono signal is used. The audio signal heard by the audience has no sense of direction, and the audio image appears in the middle of the head, which is inconsistent with the position of the speaker.

[0018] (2) Although HRTF technology can generate a virtual sound source in the desired direction, there are still some problems: first, the sense of distance is not strong, and the virtual sound source perceived by the audience is near the scalp, which is far from the actual scene; First, the amount of HRTF data that needs to be stored is large, including hundreds of sets of data in the entire three-dimensional direction; the third is to use BRIR instead of HRIR (or HRTF) although the effect is closer to the actual acoustic scene, but the amount of data and calculations are several times larger class

If BRIR is replaced by adding early reflections and reverberation, the amount of data and calculations will be reduced accordingly, but real-time implementation is still difficult; Fourth, although the effect is better after adding dynamic processing, HRTF generally uses 1 degree Refresh, the amount of calculation is particularly large, and real-time implementation requires high hardware requirements

[0019] (3) Using technologies other than HRTF, such as vector base amplitude adjustment (VBAP), high-fidelity stereo reproduction (AMBISONICS), wave field synthesis (WFS) and other technologies, the technical implementation is relatively complicated, and generally they will not be used Used when replaying only language

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