| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Outline of Final Research Achievements |
In a forensic situation, since speech samples are usually recorded in highly noisy environments, for example, in a store or a car where background music is played, the signal-to-noise ratio (SNR) of these samples is severely degraded. We propose speech enhancement methods effective to these samples in this study. In some proposed methods, source signals of the noise were used as reference signals, because real time processing is unnecessary for forensic purpose and the source signals used for background music is easily available. And non-negative matrix factorization (NMF) or sinusoidal modeling was used for signal representation. Experiment showed the effectiveness of the proposed methods to the severely degraded signals. In addition to these methods based on signal processing technique, preliminary examination was carried out to investigate the availability of speech recognition technology.
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