Apparatus, method and computer program for providing a set of spatial cues on the basis of a microphone signal and apparatus for providing a two-channel audio signal and a set of spatial cues

An apparatus for providing a two-channel audio signal and a set of spatial cues associated with an upmix audio signal comprising more than two channels, the apparatus comprising:

• a microphone arrangement comprising a first directional microphone and a second directional microphone,
• wherein the first directional microphone and the second directional microphone are spaced by no more than 30 cm, and wherein the first directional microphone and the second directional microphone are oriented such that a directional characteristic of the second directional microphone is a rotated version of a directional characteristic of the first directional microphones;
• and
• an apparatus for providing a set of spatial cues associated with an upmix audio signal comprising more than two channels on the basis of a two-channel microphone signal, the apparatus comprising:
• a signal analyzer configured to acquire a component energy information and a direction information on the basis of the two-channel microphone signal, such that the component energy information describes estimates of energies of a direct sound component of the two-channel microphone signal and of a diffuse sound component of the two-channel microphone signal, and such that the direction information describes an estimate of a direction from which the direct sound component of the two-channel microphone signal originates;
• and
• a spatial side information generator configured to map the component energy information of the two-channel microphone signal and the direction information of the two-channel microphone signal onto a spatial cue information describing the set of spatial cues associated with an upmix audio signal comprising more than two channels,
• wherein the apparatus for providing a set of spatial cues associated with an upmix audio signal is configured to receive the microphone signals of the first and second directional microphones as the two-channel microphone signal, and to provide the set of spatial cues on the basis thereof;
• and
• a two-channel audio signal provider configured to provide the microphone signals of the first and second directional microphones, or processed versions thereof, as the two-channel audio signal.

An apparatus for providing a processed two-channel audio signal and a set of spatial cues associated with an upmix signal comprising more than two channels on the basis of a two-channel microphone signal, the apparatus comprising:

• an apparatus for providing a set of spatial cues associated with an upmix audio signal comprising more than two channels on the basis of the two-channel microphone signals, the apparatus comprising:
• a signal analyzer configured to acquire a component energy information and a direction information on the basis of the two-channel microphone signal, such that the component energy information describes estimates of energies of a direct sound component of the two-channel microphone signal and of a diffuse sound component of the two-channel microphone signal, and such that the direction information describes an estimate of a direction from which the direct sound component of the two-channel microphone signal originates;
• and
• a spatial side information generator configured to map the component energy information of the two-channel microphone signal and the direction information of the two-channel microphone signal onto a spatial cue information describing the set of spatial cues associated with an upmix audio signal comprising more than two channels;
• and
• a two-channel audio signal provider configured to provide processed two-channel audio signal on the basis of the two-channel microphone signal,
• wherein the two-channel audio signal provider is configured to scale a first audio signal of the two-channel microphone signal using one or more first microphone signal scaling factors, to acquire a first processed audio signal of the processed two-channel audio signal,
• wherein the two-channel audio signal provider is also configured to scale a second audio signal of the two-channel microphone signal using one or more second microphone signal scaling factors, to acquire a second processed audio signal of the processed two-channel audio signal,
• wherein the two-channel audio signal provider is configured to compute the one or more first microphone signal scaling factors and the one or more second microphone signal scaling factors on the basis of the component energy information provided by the signal analyzer of the apparatus for providing a set of spatial cues, such that both the spatial cues and the microphone signal scaling factors are determined by the component energy information.