19: Audio Enhancement – Noise Reduction

noise reductionMost recordings that I come across as an Audio Forensic Expert are made in poor condition and their biggest problem is an abundance of noise. Though there are many ways to reduce the noise floor in a recording, there is no guaranteed method. The noise floor can be defined as a sum of all of the unwanted signals in a sound source. This will include any background noise in an environment such as cars driving by, televisions or radios, or even other people besides the desired person speaking.

When reducing the noise is the best option, there are two common ways to do so in most audio editing software: noise reduction processing and filtering or equalization. Both processes have benefits and side effects when used to remove noise from a recording.

The most important thing to remember when removing noise from a recording is that the goal is to enhance or clarify the desired signal. Every audio recording is different, and as an Audio Forensic Expert it is my job to analyze and process each recording as needed. It takes training and experience to recognize what a recording needs in order to enhance or clarify it effectively.

Now listen in with Audio and Video Forensic Expert Ed Primeau as he discusses the use of noise reduction in forensic audio enhancements.

photo credit: Neve Compressors via photopin (license)

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One Response to “19: Audio Enhancement – Noise Reduction”

  1. Franco Hernandez says:

    I used a Sony Recorder to record the activities in my house during the morning. I have some interesting activity, that was carry out behind doors that is audible only if you pay attention, but it is there. I was wondering if you can amplify the sounds I am sure there more. I tried with Sound Organizer to no avail, but I can hear it they are there!

    Please let me know if this can be done, the file is an MP3, but I can save it in a different format.

    Thank you!

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