What does sample size refer to in audio?

Sample size in audio refers to the amount of memory allocated for recording audio samples, which is crucial for determining audio quality. It typically indicates how much information is captured for each sample of sound. A larger sample size allows for greater detail in the audio signal, leading to higher fidelity.

In digital audio, the sample size is often measured in bits; for example, 16-bit or 24-bit audio formats represent different sample sizes. A higher bit depth enables the recording of a wider dynamic range and more subtle nuances in the audio, resulting in a more accurate and richer sound reproduction.

The other options do not accurately define sample size. While the quality of the audio track is influenced by factors like sample rate and bit depth, it doesn't specifically denote sample size. The length of the audio file refers to its duration rather than the memory used for each sample. The number of channels relates to whether the audio is mono or stereo, which is separate from the concept of sample size.