Apparatus and method for generating audio signal having sound enhancement effect

1. An audio apparatus, comprising:

a decay pattern generator configured to generate an audio signal to which a decay pattern is applied in an early reflection region by convoluting the decay pattern with PCM raw data of a sound source so that the decay pattern follows each impulse response in the early reflection region of the generated audio signal, wherein the length of the decay pattern does not exceed 35 ms;

a reverberation generator configured to generate reverberation from the audio signal to which the decay pattern is applied in the early reflection region; and

an adder configured to generate an output signal having a sound enhancement effect by adding the PCM raw data to an output of the reverberation generator.

2. The apparatus of claim 1 , wherein the length of the decay pattern does not exceed any length between reflected sounds present in the first early reflection portion in the early reflection region.

3. The apparatus of claim 1 , wherein the decay pattern has a form in which an envelope is exponentially decreasing in time domain, and a frequency response between 200 Hz and 20 kHz has several peaks and valleys within a range of 40 dB.

4. The apparatus of claim 1 , wherein the reverberation generator includes at least one of a comb filter, a parallel comb filter, an all pass filter, a finite impulse response (FIR) filter, and a feedback delay network.

5. The apparatus of claim 1 , which uses different combinations of the decay pattern generator and the reverberation generator with respect to a left signal and a right signal when the sound source is a stereo signal.

6. A method of generating an audio signal, comprising:

generating a decay pattern to be applied in an early reflection region, wherein the length of the decay pattern does not exceed 35 ms;

generating an audio signal to which the decay pattern is applied by convolving the generated decay pattern with PCM raw data of a sound source so that the generated decay pattern follows each impulse response in the early reflection region of the generated audio signal;

generating reverberation from the audio signal to which the decay pattern is applied in the early reflection region; and

generating an output signal having a sound enhancement effect by adding the PCM raw data to an output of the reverberation generator.

7. The method of claim 6 , wherein the decay pattern has a length which does not exceed any length between reflected sounds present in the first early reflection portion of the early reflection region.

8. The method of claim 6 , wherein the decay pattern has a form in which an envelope is exponentially decreasing in time domain, and a frequency response between 200 Hz and 20 kHz has several peaks and valleys within a range of 40 dB.

9. The method of claim 6 , wherein in generating the reverberation from the audio signal to which the decay pattern is applied, the reverberation is generated using at least one of a comb filter, a parallel comb filter, an all pass filter, a finite impulse response (FIR) filter and a feedback delay network.

10. The method of claim 6 , which uses different combinations of the decay pattern generator and the reverberation generator with respect to a left signal and a right signal when the sound source is a stereo signal.

11. The apparatus of claim 1 , wherein the length of the decay pattern is determined by a configuration of the reverberation generator.

12. The method of claim 6 , wherein the length of the decay pattern is determined by a configuration of the reverberation generator.