Dithering in music is a process of adding low-level noise to a digital audio signal when it is being converted from a higher bit depth to a lower bit depth. Bit depth refers to the number of bits used to represent each sample of an audio signal. When an audio signal is converted from a higher bit depth to a lower bit depth, such as from 24-bit to 16-bit, the conversion process can introduce quantization error, which results in distortion and noise in the audio signal. Dithering is used to mitigate this problem by adding a small amount of random noise to the signal, which masks the distortion and results in a smoother and more natural sound.

Dithering is typically used during the final stages of mixing and mastering when the audio signal is being converted to a lower bit depth for distribution or playback. The process of converting the audio signal from a higher bit depth to a lower bit depth is known as “downsampling.” Downsampling can cause quantization error, which results in distortion and noise in the audio signal. Dithering can help to reduce this distortion and noise by adding a small amount of random noise to the signal, which helps to smooth out the quantization error.

The main benefit of dithering is that it can improve the overall sound quality of an audio signal, particularly when it is being downsampled to a lower bit depth. Dithering helps to reduce the distortion and noise that can be introduced during the downsampling process, resulting in a smoother and more natural sound. Additionally, dithering can help to prevent “banding” in the audio signal, which is a type of distortion that can occur when the bit depth is reduced.

It is important to note that dithering is not necessary when downsampling to a higher bit depth, such as from 16-bit to 24-bit. In fact, adding dither to a signal that is being upsampled can actually introduce noise and distortion to the signal. Therefore, it is important to only use dithering when downsampling to a lower bit depth.

When Should I Use Dithering?

When deciding whether or not to use dithering, it is important to consider the intended use of the audio signal. If the audio will be distributed or played back in a format with a lower bit depth, such as CD or MP3, then dithering should be used to ensure the best possible sound quality. If the audio will be kept in a high-resolution format, such as 24-bit or higher, then dithering may not be necessary.