Removing background sound from an audio clip can be a challenging task, especially if the background sound is mixed with the foreground sound. However, here are a few techniques you can try:
Noise Reduction Software: Make use of audio editing software that has noise reduction capabilities. These tools often have features like spectral editing or noise reduction filters that can help reduce or eliminate background noise. Some popular software options include Adobe Audition, Audacity, and iZotope RX.
Spectral Editing: If your audio editing software supports spectral editing, you can visually identify and isolate the background noise in the frequency spectrum. Once identified, you can use spectral editing tools to reduce or remove the specific frequencies associated with the background noise.
Noise Gates: A noise gate is a processor that allows audio to pass through only when it exceeds a certain threshold. By setting the threshold appropriately, you can reduce the volume of the background noise during silent or low-level sections while preserving the foreground sound during louder sections.
Manual Editing: In some cases, you might need to manually edit the audio waveform to remove background noise. This can involve using tools like volume automation or audio envelope editing to reduce the volume of the noisy parts. However, manual editing can be time-consuming and may not always yield perfect results.
It's important to note that completely removing background sound while preserving the foreground sound is a challenging task, especially if the background noise is strongly mixed with the desired audio. The effectiveness of these techniques will depend on factors such as the quality of the original recording, the nature of the background noise, and the available tools and skills.