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Severe distortion on semi-professional videos

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  • Severe distortion on semi-professional videos

    People often hire a videographer to capture the precious moments of important life events like weddings, graduations, bar/bat mitzvahs, sweet 16 parties and so forth. Instead of using a smart phone to capture the event, they hire a semi-professional to produce a higher quality video. These events often include a DJ and/or band with a sound system. So, here is the issue that I have seen and heard many times. The video comes back and the sound track is totally distorted. The reason why is that someone inadvertently took a line level output from the audio mixing board and plugged it into the microphone level input on the video recording system. This completely saturates (overloads) the first audio amplification stage of the video recording system. This situation is a disaster and hard to recover from. Several tools can be used to help. First is the application of the de-clipper. Second is the use of the CNF after sampling on a sector having particularly bad distortion. Third is the use of a higher order Low Pass Filter to reduce the harmonic content of the distortion. Sometimes, the use of a Bandpass filter if the bass if of particular issue on the distortion. The best solution is to be sure that the sound system line output is fed into the line level input on the video recording system or to insert an attenuator between the line level output of the mixer and the microphone level input, but this must be done before the recording is made.

    Craig
    Last edited by Craig Maier; 06-07-2020, 12:34 PM.
    "Who put orange juice in my orange juice?" - - - William Claude Dukenfield
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