Grounded theory is a systematic methodology in the social sciences involving the construction of theory through methodic gathering and analysis of data. Grounded theory is a research methodology which operates inductively, in contrast to the hypothetico-deductive approach. A study using grounded theory is likely to begin with a question, or even just with the collection of qualitative data. As researchers review the data collected, repeated ideas, concepts or elements become apparent, and are ta
Definition - What does Pulse Code Modulation (PCM) mean? Pulse code modulation (PCM) is a digital representation of an analog signal that takes samples of the amplitude of the analog signal at regular intervals. The sampled analog data is changed to, and then represented by, binary data. PCM requires a very accurate clock.
In a PCM stream, the amplitude of the analog signal is sampled regularly at uniform intervals, and each sample is quantized to the nearest value within a range of digital steps. Linear pulse-code modulation (LPCM) is a specific type of PCM where the quantization levels are linearly uniform.This is in contrast to PCM encodings where quantization levels vary as a function of amplitude (as with the A-law algorithm or the Î¼-law algorithm). LPCM has been defined as a part of the DVD (since 1995) and Blu-ray (since 2006) standards. 2  It is also defined as a part of various digital video and audio storage formats (e.g. DV since 1995, AVCHD since 2006).