Apparatus, method and computer-readable medium producing vertical direction virtual channel

1. An apparatus generating a vertical direction virtual channel, comprising:

a vertical direction spectrum application unit to apply, using a processor, a vertical direction spectrum characteristic to an audio source signal including at least one audio signal of a top layer; and

a vertical direction virtual speaker signal generator to generate, using a processor, a vertical direction virtual speaker signal by adjusting a gain with respect to the audio signal in which the vertical direction spectrum characteristic is applied, based on virtual speaker direction information,

wherein the vertical direction virtual speaker signal generator comprises:

an interaural level difference (ILD) adjuster to adjust an ILD with respect to a first speaker signal, a second speaker signal, and a third speaker signal by calculating a gain value based on directional information of a vertical virtual speaker and directional information of the audio signal to which the vertical direction spectrum characteristic is applied, and by applying the calculated gain value to the signal in which the vertical direction spectrum characteristic is applied,

wherein the first speaker signal is output to a first speaker,

wherein the second speaker signal is output to a second speaker and

wherein the third speaker signal is output to a third speaker.

2. The apparatus of claim 1 , wherein the at least one audio signal of the top layer includes at least one of a left source signal of the top layer and a right source signal of the top layer.

3. The apparatus of claim 1 , wherein the ILD adjuster comprises:

a gain value calculator to calculate, based on the directional information of the vertical virtual speaker, the gain value to be applied to the audio signal in which the vertical direction spectrum characteristic is applied, and

the ILD adjuster outputs the ILD-adjusted first speaker signal, second speaker signal, and third speaker signal by applying the calculated gain value to the audio signal in which the vertical direction spectrum characteristic is applied.

4. The apparatus of claim 3 , wherein the gain value calculator calculates a first gain value corresponding to a direction of the first speaker, a second gain value corresponding to a direction of the second speaker, and a third gain value corresponding to a direction of the third speaker.

5. A method of generating a vertical direction virtual channel, comprising:

applying, by at least one processor, a vertical direction spectrum characteristic to an audio source signal including at least one audio signal of a top layer; and

generating, by the at least one processor, a vertical direction virtual speaker signal by adjusting a gain with respect to the audio signal in which the vertical direction spectrum characteristic is applied, based on virtual speaker direction information,

wherein the generating comprises adjusting an interaural level difference (ILD) with respect to a first speaker signal, a second speaker signal, and a third speaker signal by calculating a gain value based on directional information of a vertical virtual speaker and directional information of the audio signal to which the vertical direction spectrum characteristic is applied, and by applying the calculated gain value to the signal in which the vertical direction spectrum characteristic is applied,

wherein the first speaker signal is output to a first speaker,

wherein the second speaker signal is output to a second speaker and

wherein the third speaker signal is output to a third speaker.

6. The method of claim 5 , wherein the applying a vertical direction spectrum characteristic to the audio signal comprises applying the vertical direction spectrum characteristic to a left source signal of the top layer and a right source signal of the top layer.

7. The method of claim 5 , wherein the adjusting comprises:

calculating, based on the directional information of the vertical virtual speaker, the gain value to be applied to the audio signal in which the vertical direction spectrum characteristic is applied; and

outputting the ILD-adjusted first speaker signal, second speaker signal, and third speaker signal by applying the calculated gain value to the audio signal in which the vertical direction spectrum characteristic is applied.

8. The method of claim 7 , wherein the calculating comprises calculating a first gain value corresponding to a direction of a first speaker, a second gain value corresponding to a direction of a second speaker, and a third gain value corresponding to a direction of a third speaker.

9. At least one non-transitory computer-readable medium comprising computer readable instructions that control at least one processor to implement a method of generating a vertical direction virtual channel, comprising:

applying a vertical direction spectrum characteristic to an audio source signal including at least one audio signal of a top layer; and

generating a vertical direction virtual speaker signal by adjusting a gain with respect to the audio signal in which the vertical direction spectrum characteristic is applied, based on virtual speaker direction information,

wherein the generating comprises adjusting an interaural level difference (ILD) with respect to a first speaker signal, a second speaker signal, and a third speaker signal by calculating a gain value based on directional information of a vertical virtual speaker and directional information of the audio signal to which the vertical direction spectrum characteristic is applied, and by applying the calculated gain value to the audio signal in which the vertical direction spectrum characteristic is applied,

wherein the first speaker signal is output to a first speaker,

wherein the second speaker signal is output to a second speaker and

wherein the third speaker signal is output to a third speaker.