The Third Information Science Section researches and investigates sounds and voices that were recorded at a crime scene. We are mainly developing speaker identification methods to judge whether the suspect's voice and the criminal's voice, recorded during a crime such as kidnapping or intimidation, are from the same person. Moreover, to improve the quality of a criminal's voice in a noisy environment, we are researching a method of noise reduction.
Voiceprints are produced by a frequency analysis using a computer. We compare a suspect's voiceprint with a criminal's voiceprint and identify whether the voices belong to the same person.
By using an automated voice identification system, we can execute speaker verification and retrieval by signal processing, which differs from analysis of voiceprint.