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Forensic audio enhancement is the scientific analysis and improvement of audio clarity, typically to improve intelligibility. Although the term is "enhancement", the process is almost entirely composed of filtering away unwanted sounds in order to leave a more understandable version. ==Process== To accomplish enhancement, the most common process is to follow these steps: # Reliably digitize audio recordings onto a computer system, typically in WAV (lossless) or MP3 (lossy) formats. # Filter out hiss, click and pop sounds. This is common with recordings that may have suffered partial data loss with age. # Block out or quiet ranges and specific frequencies (such as 60Hz wall power, and its multiples, within the USA and Japan). # Isolate unwanted constant tones or patterns and then removing those items from across the entire recording. # When the recording is in stereo, reference the channels to each other to perform directional noise cancelling. # Normalize voices so that each audible person is heard at equal volumes. # Smooth sounds that border nearly inaudible gaps. These gaps include those created during the filtering process. # Prepare a transcript of audio and words heard # Testify in court about the enhancement done and the audio and words heard 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Forensic audio enhancement」の詳細全文を読む スポンサード リンク
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