 |
|
|
| Digital is simply an alternate method of carrying, transmitting, and storing audio. This is executed with the use of a combination of digits (0s and 1s). |
|
|
|
|
| Pulse Code Modulation (PCM) is the most widely used method to convert an analog signal into digital data. |
|
|
|
|
| An analog signal is received at the input of an A/D converter where the voltages of the signal are measured at regular intervals. An A/D converter must then measure the signal twice per cycle at the very least. |
|
|
|
|
| This theorem states that the bandwidth of the information carried by any communications system is limited to half the carrier frequency. In the case of digital audio, the information is the audio signal and the carrier is the sample rate. |
|
|
|
|
| This is defined as the maximum audio frequency a digital system can capture with any given sample rate. For instance, a 48k sample-rate recording can accurately capture a 24k signal and a 44.1k sample rate can accurately capture a 22.05k signal. |
|
|
|
|
| The Compact Disc uses a sample rate of 44.1k, meaning it can carry audio frequencies up to approximately 20k. Since 20k is regarded as beyond what a human being can hear, the designers figured there was no reason to sample at a higher rate. Interestingly enough, 44.1k and 48k were about as high as the technology would allow. Today, this has all changed. |
|
United States
(change country or region)