differential pulse code modulation (DPCM)
Pulse-code modulation in which an analog signal is sampled and the difference between the actual value of each sample and its predicted value, derived from the previous sample or samples, is quantized and converted, by encoding, to a digital signal. Note: There are several variations of differential pulse-code modulation. | ||||
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Differential pulse-code modulation Definition from Science & Technology Dictionaries & Glossaries
| RF Electronics |
Differential Pulse Code Modulation (DPCM)
A pulse code modulation in which the coded value transmitted for each sample represents the quantized difference between the present sample value and a prediction value. For signals having strong correlation between successive samples, a reduction of information can be attained, since fewer levels may be used to quantize differences than would be required for quantizing sample values with comparable precision.
A pulse code modulation in which the coded value transmitted for each sample represents the quantized difference between the present sample value and a prediction value. For signals having strong correlation between successive samples, a reduction of information can be attained, since fewer levels may be used to quantize differences than would be required for quantizing sample values with comparable precision.
Differential pulse-code modulation Definition from Encyclopedia Dictionaries & Glossaries
| Wikipedia English - The Free Encyclopedia |
Pulse-code modulation
Pulse-code modulation (PCM) is a digital representation of an analog signal where the magnitude of the signal is sampled regularly at uniform intervals, then quantized to a series of symbols in a digital (usually binary) code. PCM has been used in digital telephone systems and is also the standard form for digital audio in computers and the compact disc red book format. It is also standard in digital video, for example, using ITU-R BT.601. However, straight PCM is not typically used for video in consumer applications such as DVD or DVR because it requires too high a bit rate (PCM audio is supported by the DVD standard but rarely used). Instead, compressed variants of PCM are normally employed. However, many Blu-ray Disc and HD-DVD movies use uncompressed PCM for audio. Very frequently, PCM encoding facilitates digital transmission from one point to another (within a given system, or geographically) in serial form.
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