Unlike integers, whose bit pattern is a single series of bits, a floating point number is instead composed of separate fields whose mathematical relation forms a number. Both the WAV file format and the AIFF file format support floating point representations. Today, most audio file formats and digital audio workstations (DAWs) support PCM formats with samples represented by floating point numbers. Integer PCM audio data is typically stored as signed numbers in two's complement format. Thus, a 16-bit system has a resolution of 65,536 (2 16) possible values. The number of possible values that can be represented by an integer bit depth can be calculated by using 2 n, where n is the bit depth. Adding one bit doubles the resolution, adding two quadruples it and so on. The resolution of binary integers increases exponentially as the word length increases. The resolution indicates the number of discrete values that can be represented over the range of analog values. The amplitude is the only information explicitly stored in the sample, and it is typically stored as either an integer or a floating point number, encoded as a binary number with a fixed number of digits: the sample's bit depth, also referred to as word length or word size. Each sample represents the amplitude of the signal at a specific point in time, and the samples are uniformly spaced in time. A PCM signal is a sequence of digital audio samples containing the data providing the necessary information to reconstruct the original analog signal.
0 Comments
Leave a Reply. |