data processing method for estimating audio signal mixing parameters, mixing process, devices, and programs associated computers

The invention relates to a method of data processing for estimating the mixing parameters at least one auxiliary audio signal picked up by a sound pickup device, said extra microphone arranged near an source of a plurality of sound sources constituting a sound scene, and a main audio signal picked up by a sound pickup ambisonic device, arranged to sense said plurality of sound sources of the sound scene. According to the invention, said method comprises the following steps, implemented for one frame of the main audio signal and a said extra frame signal, a frame comprising at least one block of N samples: - estimating a delay (τ) between the omnidirectional component of the frame of the main audio signal and the frame of said booster signal, from a block of N samples of a frame of one of the two audio signals, said reference block, associated at a time predetermined acquisition, and an observation area of ​​the frame of the other audio signal, comprising at least one block of N samples and formed in a neighborhood of the time of acquisition by maximization a similarity measure between the reference block and a block of the observation area, said observation unit temporally offset from the delay (τ) with respect to the reference block; and - estimating at least one angular position of the source detected by said extra microphone in a repository by the main microphone calculating a ratio between a first dot product of a first component of the block of the main audio signal associated with yet predetermined acquisition block and a temporally shifted side audio signal of the delay (τ) and an estimated second scalar product of a second component of said block of the main audio signal and the corresponding block of the audio signal shifted temporally delay (τ) estimated.