US 2012/0237055 A1Published application

Method for dubbing microphone signals of a sound recording having a plurality of microphones

AssigneeInstitut Fur Rundfunktechnik GmbH

InventorJens Groh

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Abstract

In order to compensate tonal changes arising from a multi-path propagation of sound portions during the mixing of multi microphone audio recordings as far as possible it is suggested to form spectral values of respectively overlapping time frames of samples of each a first microphone signal (100) and a second microphone signal (101). The spectral values (300) of the first microphone signal (100) are distributed with formation of spectral values (311) of a first sum signal to the spectral values (301) of a second microphone signal (101) in a first summing level (310), whereat a dynamic correction of the spectral values (300, 301) of one of the two microphone signals (100, 101) occurs. Spectral values (399) of a result signal are formed out of the spectral values (311) of the first sum signal which are subject to an inverse Fourier-transformation and a block junction (FIG. 3).

Claims17

Dependent claims

Method for mixing microphone signals of an audio recording with a plurality of microphones (multi-microphone audio recording), wherein a multipath propagation of sound portions is given and

a first microphone signal and a second microphone signal are subject to the building of blocks of samples and a Fourier-transformation, wherein the spectral values of the respective microphone signal are generated,
the spectral values of the first microphone signal are distributed onto the spectral values of the second microphone signal in a first summing level while formation of spectral values of a first sum signal, wherein a dynamic correction of the spectral values of one of the two microphone signals occurs,
the spectral values of the first sum signal form spectral values of a result value, and
the spectral values of the result value undergo an inverse Fourier-transformation and the junction of blocks of samples, wherein the result signal is generated,
characterized in that in order to generate the spectral values of the first sum signal of the spectral values of the first microphone signal and the spectral values of the second microphone signal the spectral values of one of the two signals can be chosen,
which is to be prioritized over the other signal,
that the spectral values (A(k)) of the signal to be prioritized are multiplied with the respective corresponding corrective factors m(k), and that the spectral values (B(k)) of the signal not to be prioritized and the corrected spectral values m(k)·A(k) of the signal to be prioritized are added while formation of spectral values of a result signal.

4 more elements

Mixing circuit for mixing the first and second tonal signals and for producing a result signal, comprising

a first input for reception of the first tonal signal,
a second input for reception of the second tonal signal,
an output for setting out the result signal,
a combination circuit with first and second inputs coupled with the first or respectively the second input of the mixing circuit and an output coupled with the output of the mixing circuit, the combination circuit comprising:
a calculation unit
a multiplication circuit
a signal combination unit,
in that the inputs of the combination circuit are coupled with a first and second input of the calculation unit, in that an output of the calculation unit is coupled with a first input of the multiplication circuit, in that a first input of the mixing circuit is coupled with a second input of the multiplication circuit, in that an output of the multiplication circuit is coupled with a first input of the signal combination unit, in that one of the two inputs of the mixing circuit is coupled with a second input of the signal combination unit, in that an output of the signal combination unit is coupled with the output of the combination circuit, and in that the calculation unit is equipped for deriving a multiplication factor (m(k)) depending on the signals at the inputs of the calculation unit.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/509,473Filed 2 Nov 2010
Priority: DE 10 2009 052 992.612 Nov 2009
Published: 20 Sep 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

H04S 3/008
Systems employing more than two channels, e.g. quadraphonic: in which the audio signals are in digital form, i.e. employing more than two discrete…
H04H 60/04
Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linking to broadcast…:…
H04S
Stereophonic systems
H04H
Broadcast communication