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The major difference between an analog and a digital recording is how sound is represented on the recording medium. In an analog recording, the electrical wave that represents the sound varies in a way that is the same or "analogous" to the actual compression-expansion cycles of sound itself. Therefore, it's known as analog. When this signal is reproduced, the electrical wave is converted back to acoustical energy in the headphones or speakers. Any random noise generated by the recording media, mainly tape hiss, is reproduced along with the original sound. In a digital recording the sound wave is sampled at a constant rate, (typically multiples of either 44.1 or 48 kHz), and these pulses are recorded at a selected bit-depth, generally 16, 24, or 32-bit. When the digital signals are reproduced, any noise generated by the recording medium is not. However, that doesn't mean that all digital recordings are noise-free. In fact, low-level digital recordings can have noise, just as analog recordings.