Using computer simulation software is a useful technique for checking the reverberation (echo) and the acoustic disturbance in a room during the design phase.
We have developed a room acoustic design support software called 'RIMAGE' that focuses on the roomfs sound field. This software is based on geometric acoustics theory of image source method. When calculating the reverberation time of the reflection path of sound that reached the audience seat in an open space in a music hall. Various physical sound indexes confirm obstacles of sound like echoes, reflectivity and sound pressure distribution situation which can be forecasted when designing a room acoustic by evaluating the numerical value.
Moreover, it is possible to evaluate the acoustic without using numerical value, by actually listening to the sound. For example depending on the construction the echo in a room will vary due to these elements, the acoustic material, the finished paint, the ceiling and the interior of the room. Furthermore the ease of listening works around the calculated value and seconds of the reverberation time of the echo to the listener.

To undertake the room acoustical design and the noise measures examination you need to set the target Values like reverberation time, interior noise level, NC-value and so on. .
However, it is difficult to recognize with those numeric values how you can hear the echo in the hall and unwanted noise in the room.
Consequently, our companyfs digital signal processing technology suggests that the design phase, location and visibility play a major part in the audible of sound.
For us, using audible for sound field reproduction system falls into 2 categories. The first category is to calculate the direction of arrival for the impulse response data in the music source and a convolution sound source in our listening room with a multichannel speaker system with 3D sound field reproduction 'Symphony'.
The second category is using 2 speakers for listeners to use the head-related transfer function 'HRTF' for both ears. That technology of canceling the crosstalk and using only 2 speakers, the sound can move back and forth using a 3D sound field reproduction and 'OSS' a 2ch sound field reproduction system.
The following examples use this system; music hall, studio, conference room, reverberation, echo, acoustic temperature. There is an advantage of altering the following points; sound absorbing, reflective, interior specification.
Additionally, to measure the interior noise in a condominium uses the audible method to simplify the process to measure the noise barrier performance by using a digital filter, external noise and folding in operation. This system confirms the situation of the noise that gains admission through a window by the audibility is offered.

In a classroom, when it is difficult to hear "you cannot hear the clarity of resonate" calculating the 20 reverberation or more using the impulse response data system. Calculating the outcome of a classroom that is made from materials like gypsumboard and board of rock wool absorbing sound absorptive. It is known that the shape of a reflective sound wave is small when the sound is first directed to us. It is possible to listen to the different sound condition of the convolution when announcement of anechoic room recording using the voice data, reproduced by loudspeakers and headphone.