"Shinji" system consists of application software to manage the psychological measurement of the sound, a computer system to run it, an audio interface to present a sound stimulus to a subject and a response terminal to collect the responses from the subject.
In this system, the sound stimulus is handled as a file in a computer and presents it directly from the computer using an audio interface such as sound cards. The subject's responses to sound stimuli are collected by the response terminals in real time according to the progress of the measurement. Moreover, the host computer and the terminal are connected by LAN. By using a wireless LAN, it is also possible to build an experimental environment without using cables.
The psychological measurement of the sound that using "Shinji" system will be carried out as follows.
"Shinji" can process the procedure from (3) to (7), and it can greatly reduce the workload of the psychoacoustic measurement compared with an existing method.

It is man that finally judges the quality of the sound. Even when listening to the sounds which have only a little physical difference, the psychological impression we obtained is sometimes greatly different. Moreover oppositely, we may not feel the difference even if there are great differences in the physical property when we listen to the sounds. It is very important to know what difference the human feel upon hearing it, when we change the physical characteristic of the sound,
For example, when hearing noise of same intensity, we may feel a quite different impression according to the difference of the time structure and frequency characteristic. The basis of the noise control is to make the noise quieter, or disappear overall. But in the case that we cannot obtain adequate result after taking the measurements against the noise up to the limit, if the psychological impression that was received when someone hears it can be changed, the noise that was the problem might not be the concern.
In general, sound that has a simple structure that is closely interrelated between its physical characteristic and the psychological evaluation, and many rules have been obtained, such as the relationship between the frequency and pitch, amplitude and loudness, spectrum and tone, and so on. However, the sound we actually hear has a very complex structure in most cases. So, we cannot always explain all the interrelation in the rules. Therefore, now, when we cannot find a simple rule between the physical value and the psychological value of sound, then we implement a "Psychoacoustic test" in which we can measure the psychological value by making many people actually hear the sound and investigate the interrelation with the physical value.
"Shinji" system supports the "Psychoacoustic test" to search for the rules between the physical and psychological value of sound. For the "Psychoacoustic test", many systematic measurement methods have been established according to the purpose of the investigation. "Shinji" system supports various kinds of measurement method including pair comparison, category judgment and semantic differential.