Differential pulse-code modulation
Differential pulse-code modulation (DPCM) is a signal encoder that uses the baseline of pulse-code modulation (PCM) but adds some functionalities based on the prediction of the samples of the signal. The input can be an analog signal or a digital signal. If the input is a continuous-time analog signal, it needs to be sampled first so that a discrete-time signal is the input to the DPCM encoder. DPCM was invented by C. Chapin Cutler at Bell Labs in 1950; his patent includes both methods.
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- enDifferential pulse-code modulation (DPCM) is a signal encoder that uses the baseline of pulse-code modulation (PCM) but adds some functionalities based on the prediction of the samples of the signal. The input can be an analog signal or a digital signal. If the input is a continuous-time analog signal, it needs to be sampled first so that a discrete-time signal is the input to the DPCM encoder. DPCM was invented by C. Chapin Cutler at Bell Labs in 1950; his patent includes both methods.
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- enDifferential pulse-code modulation (DPCM) is a signal encoder that uses the baseline of pulse-code modulation (PCM) but adds some functionalities based on the prediction of the samples of the signal. The input can be an analog signal or a digital signal. If the input is a continuous-time analog signal, it needs to be sampled first so that a discrete-time signal is the input to the DPCM encoder. * Option 1: take the values of two consecutive samples; if they are analog samples, quantize them; calculate the difference between the first one and the next; the output is the difference. * Option 2: instead of taking a difference relative to a previous input sample, take the difference relative to the output of a local model of the decoder process; in this option, the difference can be quantized, which allows a good way to incorporate a controlled loss in the encoding. Applying one of these two processes, short-term redundancy (positive correlation of nearby values) of the signal is eliminated; compression ratios on the order of 2 to 4 can be achieved if differences are subsequently entropy coded because the entropy of the difference signal is much smaller than that of the original discrete signal treated as independent samples. DPCM was invented by C. Chapin Cutler at Bell Labs in 1950; his patent includes both methods.
- Hypernym
- Encoder
- Is primary topic of
- Differential pulse-code modulation
- Label
- enDifferential pulse-code modulation
- Link from a Wikipage to another Wikipage
- Adaptive differential pulse-code modulation
- Analog signal
- Bell Labs
- C. Chapin Cutler
- Category:Telephony signals
- Continuous-time
- Delta modulation
- Delta-sigma modulation
- Digital signal (signal processing)
- Discrete-time signal
- Entropy coding
- File:Cutler DPCM patent.png
- Pulse-code modulation
- Pulse modulation methods
- Quantization (signal processing)
- Sampling (signal processing)
- SameAs
- Differential Pulse Code Modulation
- Differential pulse-code modulation
- DPCM
- DPCM
- DPCM
- DPCM
- DPCM
- H2Zd
- m.01tf1w
- m.057xm q
- Q1224367
- Дифференциальная импульсно-кодовая модуляция
- אפנון דופק מקודד דיפירנציאלי
- تضمين نبضي مرمز تفاضلي
- 差分パルス符号変調
- 脈波差量編碼調變
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- Category:Telephony signals
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- Differential pulse-code modulation?oldid=1119983403&ns=0
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- Wikipage page ID
- 1093399
- Wikipage revision ID
- 1119983403
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- Template:Compression methods
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