발간년도 : [2021]
| 논문정보 |
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| 논문명(한글) |
[Vol.16, No.1] A Study on Realistic Audio Technology for the Blind |
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| 논문투고자 |
Kwangki Kim |
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| 논문내용 |
Barrier Free is a movement to remove physical and psychological barriers that interfere with daily life for the socially underprivileged including the disabled. Representative of the Barrier Free for the visually impaired includes auxiliary devices such as guide canes and guided robots using various sensors. However, assistive devices in the form of guided robots have problems that they are heavy and large and they expose the existence of the visually impaired even more. So as the alternative, we present a method to indicate the direction of obstacles using the realistic sound. To measure the direction of the obstacle, the visually impaired and the obstacle are placed on a complex plane. The azimuth angles of the obstacles are calculated by dividing the relative positions between the visually impaired and the obstacles into four spaces. Then the realistic sound can be generated using the HRTF coefficients for the calculated azimuth angles to indicate the direction of the obstacles. The method using only the
HRTF coefficients must have the omnidirectional HRTF coefficients, so there is a limitation that the use of the HRTF based method is rather difficult in an embedded or mobile environment. To solve the problem, we proposed the realistic sound generation technology using the HRTF coefficients and the CPP technique in the 5.1 channel environment. The proposed method maps all obstacles to the 5.1 channel reproduction environment using the CPP technique to generate the realistic sound that can inform the direction of the obstacles with only the HRTF coefficients of the 5.1 multi-channel layout. Therefore, we can reduce the memory requirements for the HRTF coefficients by more than 98%. The listening test results show that the proposed method has the similar performance compared to the method using only the omnidirectional HRTF coefficients. |
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