![]() ![]() De-reverb uses adaptive algorithms to provide the user with adjustable settings to match a reverb profile similar to the reverb conditions in the recording. iZotope RX’s de-reverb module is a great tool to help restore clarity to the vocal formants in a recording. Excessive reverberation can smear the clarity of speech formants due to reflections from the environment. Reverberation is a commonly overlooked issue here. IZotope RX’s de-reverb module is an important tool for forensic audio enhancement. This will help you get closer to applying the perfect amount of noise reduction without subtracting any important audio information. When the “Output Noise Only” setting is enabled and I hear voices, I can back off on the noise reduction amount. This is so I don’t hear any important voice information. I like using “noise-only” while listening to the recording. Within iZotope RX’s spectral denoise, look for the setting “Output Noise Only.” When enabled, you can isolate and preview all the noise you are reducing by applying the denoise filter. Excessive noise reduction introduces artifacts that worsen the voice signal even before applying the denoise filter. ![]() If you denoise too much, you end up subtracting important voice information. The idea behind denoising is finding that sweet spot of reducing enough noise (and being aware not to subtract any important vocal information) without going overboard. IZotope RX’s Spectral Denoise is a great tool for attenuating noise. ![]() By applying denoise as the first process, increasing the gain will bring all that noise back, causing the recording to be unintelligible. Eventually, you will want to increase the gain to a reasonable listening level. Today’s software tools will give different results depending on the order in which you decide to use them.įor example, let’s say you apply denoise to a quiet recording as the first step. ![]() Documenting allows you to plan what filtering tools are needed to reduce the unwanted noise in a recording. This stage allows you to analyze the condition of the recording and document all the types of distortions, interference and noise masking the conversation and/or voice that you want to hear. Tip #1: Processing Order MattersĪ forensic audio enhancement starts with the critical listening stage. Don’t worry, all of my tips apply to most versions of iZotope RX. I will be using and mentioning the forensic software tool iZotope RX9 Advanced which was released back in October 2021. In essence, you are processing away all the different distortions, unwanted noise, and interference signals that are masking the target voice information. The processing stage can be thought of as peeling back layers of an onion. This requires a different processing chain, or order, for every audio recording analyzed. In forensic audio enhancement, each recording is completely different from the next. I listen critically to the recording and determine what is interfering with the desired or wanted sound. When I first receive a recording, I analyze it for elements like vocal formants, file format, bitrate, and sample rate. How do You Enhance voice Recordings?įorensic audio enhancement requires delicate processing and consists of three important stages: critical listening, analyzing, and processing. Al Zlogar forensically enhancing voice recordings at Al Zlogar Forensics Inc. ![]()
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