Room impulse response is one of most important information with localization of sound source in 3D audio. Actually we can adjust the distance and spaciousness of a sound source with impulse response of the room. Through consequent experiments, we found that C80 and EDT are varying systematically with sound source distances, and these variations are due to early reflection decay curves. This paper contains brief explanation of the two parameters as auditory distance cues, shaping of early reflection decay curves for control of auditory distance, and psychological test results of auditory distance control with early refection decay curve shaping. With these validations, we can confirm early reflection decay curve shape is effective factor for control of perceptual auditory distance and spaciousness in the room.

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This is a brief description of audio channel or sound source separation algorithm using spatial cues. Basically inter-channel level difference (ICLD) is used for discriminating sound sources in a spatial grid for each channel pair and analysis subband. Interchannel cross-correlation (ICC) is also used for determining sound source location area and contribution factor for the considering composite sound source. In this paper, the center and side channel separation of stereophonic music signal using spatial sound source discrimination method is introduced. This is simply implemented by using given information of center channel location and derived spatial cues. The separated center channel signal is well matched with separated side channels when reproduced simultaneously.

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