- Written by Administrator
- Published on 21 November 2007
In a way, it is like Morse Code, where each unique series of dots and dashes is a code for a letter of the alphabet. There are 216 (more than 65,000) possible combinations of 16 bits being on or off in sequence, allowing CD recordings very fine detail as to how the waveform is coded. Even with 65,000 combinations of waveform coding (32,500 for the positive part of the waveform and 32,500 for the negative), the sound level (voltage) may occur in between any two sequential points in the 65,000 combinations. The player must round the value up or down to the nearest value in the 65,000 possible combinations, and this is called "Quantization Error". The ability for a CD player to handle quantization error varies, and is occasionally used as a selling point. The next generation of digital discs, of which the CD was the first type, has 48 kHz up to 192 kHz sampling and 20 - 24 bit words. This is the Audio-Only DVDs (Digital Video Disc, or Digital Versatile Disc), called DVD-Audio or DVD-A, which has the room to hold more digital data (about 15 Gigabytes of data compared to 750 Megabytes for CDs). Keep in mind that DVDs are really just CDs at a higher technological capability, i.e., they hold more data. It is sort of like upgrading your computer hard disk drive from a 750 MB capacity to a 15 GB capacity.