![]() ![]() If you try to go over that, there's no more words to define the voltage as: you can't go lower than 0 or higher than 65,535. CD audio has a sample rate of 44.1 khz, so the voltage is sampled and recorded as a 16-bit value 44,100 times per second. So with our line level signal that swings +/- 1V, -1V would be 0 and +1V would be 65,535. CD audio is 16 bits, so you've got 65,536 possible levels to define that voltage. When we digitize that, we're converting the the voltage at a given moment into a "word" of an establish bitlength. The loudest possible sound before distortion occurs would be swinging between -1 and +1 volts. A quiet signal would swing between -0.1 and +0.1 volts. You've probably seen an audio signal represented as a waveform: this is the voltage swing over time.įor the sake of simplicity (all of the following is simplified), since it's an AC signal, let's say it swings from -1 volts to +1 volts (this is line level). Long answer: Digital audio is stored as a stream of "words" or samples. ![]()
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