This could be in the form of a button which is either on or off, or will allow tweaking of the starting frequency and the strength of the reduction. While High Pass or Low Cut filters are much more common on mixers, you will find a Low Pass filter on some higher-end kit, although it's not really very common. Low-pass filters can be found in a lot of different contexts, but the ones of most relevance to us are those within mixers and recording software. Where Would you Normally Find a Low Pass Filter? For example, if you're recording a standard interview, then the Low Pass Filter will leave your voice well enough alone, while filtering out frequencies which are much higher, such as interference or the hum of certain equipment. The main purpose of a Low Pass filter is to reduce sounds which are generally irrelevant to normal recordings. To make things a little confusing, the Low Pass Filter is sometimes known as a High cut filter or a Treble cut filter. To be less technical, it drops the volume of high-frequency sounds in anything that you record. What is a Low Pass Filter?Ī low-pass filter is, to give the technical description, a filter that allows easy passage to low-frequency signals and difficult passage to high-frequency signals. But bear with me – this might be something you'll find useful.
This is definitely on the intermediate to advanced end of the scale, so we'll be getting a little technical. The Low Pass filter is one of many different effects you'll find on mixers and many other audio production devices, so it's good to know whether you should be using it. You can further narrow the field of equalization by dragging the top-left plot mark a little to the right and the top-right plot mark a little to left.In this article, I'm looking at Low Pass filters and their relevance to Podcasting. Drag this mark to the right if you can still hear a “low-pitched sound. The equalization line should look like a flat line with a dip near the end Step 8Ĭlick “Preview” to review how much you’ve reduced the sound Step 9ĭrag the bottom plot mark to the left if you can still hear a “high-pitched” metallic sound. In the Equalization dialogue box, double-click around 8 kilohertz on the equalization line to insert a plot mark Step 6ĭouble-click on 7 kilohertz and 9 kilohertz to create two more plot marks Step 7Ĭlick and hold the 8 kilohertz plot mark and drag the mark down do the -24 dB level. Once you have located the section, click “Stop” Step 3ĭrag the cursor over the part with the metallic sound to highlight Step 4Ĭlick “Edit” and select “Equalization” Step 5 Step 2Ĭlick “Play” and locate the section with the metallic, tin-like sound. Open Audacity, click “File” and “Open” and locate the file you want to fix.
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