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Which one of the following statements about differential pulse code modulation (DPCM) is true?
- a)The sum of message signal sample with its prediction is quantized
- b)The message signal sample is directly quantized, and its prediction is not used
- c)The difference of message signal sample and a random signal is quantized
- d)The difference of message signal sample with its predictions is quantized
Correct answer is option 'D'. Can you explain this answer?
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Which one of the following statements about differential pulse code mo...
DPCM Block diagram
e[n] is quantized e[n]
e [n] is difference of message signal sample with its prediction.
e[n] is quantized e[n]
e [n] is difference of message signal sample with its prediction.
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Which one of the following statements about differential pulse code mo...
Introduction:
Differential Pulse Code Modulation (DPCM) is a technique used for digital audio compression. It is an extension of the Pulse Code Modulation (PCM) technique. PCM converts analog signals into digital signals by sampling the signal and then quantizing each sample. DPCM improves upon PCM by taking advantage of the correlation between adjacent samples.
Explanation:
The correct statement about Differential Pulse Code Modulation (DPCM) is option 'D', which states that the difference of the message signal sample with its predictions is quantized. Let's understand why this statement is true:
1. Prediction:
In DPCM, the prediction step estimates the current signal sample based on its previous samples. The prediction is done using a linear or non-linear predictor, which exploits the correlation between adjacent samples. The prediction value represents the expected value of the current sample.
2. Difference Calculation:
Once the prediction is obtained, the difference between the actual sample and the predicted sample is calculated. This difference, also known as the prediction error or residual, represents the information that needs to be encoded and transmitted.
3. Quantization:
In DPCM, the prediction error is quantized. Quantization is the process of representing a continuous value with a finite number of discrete levels. This reduces the bit rate required to represent the signal. The quantization step size determines the level of precision in representing the prediction error.
4. Encoding and Decoding:
After quantization, the quantized prediction error is encoded using entropy coding techniques, such as Huffman coding or arithmetic coding. At the receiver's end, the received coded quantized prediction error is decoded and used to reconstruct the prediction error.
5. Reconstruction:
The quantized prediction error is added to the predicted sample at the receiver's end to reconstruct the original signal sample. This reconstructed sample is then used for prediction in the next time step.
Conclusion:
In Differential Pulse Code Modulation (DPCM), the difference of the message signal sample with its predictions is quantized. This difference represents the prediction error, which is encoded and transmitted to reconstruct the original signal at the receiver's end. DPCM takes advantage of the correlation between adjacent samples to improve compression efficiency compared to regular Pulse Code Modulation (PCM).
Differential Pulse Code Modulation (DPCM) is a technique used for digital audio compression. It is an extension of the Pulse Code Modulation (PCM) technique. PCM converts analog signals into digital signals by sampling the signal and then quantizing each sample. DPCM improves upon PCM by taking advantage of the correlation between adjacent samples.
Explanation:
The correct statement about Differential Pulse Code Modulation (DPCM) is option 'D', which states that the difference of the message signal sample with its predictions is quantized. Let's understand why this statement is true:
1. Prediction:
In DPCM, the prediction step estimates the current signal sample based on its previous samples. The prediction is done using a linear or non-linear predictor, which exploits the correlation between adjacent samples. The prediction value represents the expected value of the current sample.
2. Difference Calculation:
Once the prediction is obtained, the difference between the actual sample and the predicted sample is calculated. This difference, also known as the prediction error or residual, represents the information that needs to be encoded and transmitted.
3. Quantization:
In DPCM, the prediction error is quantized. Quantization is the process of representing a continuous value with a finite number of discrete levels. This reduces the bit rate required to represent the signal. The quantization step size determines the level of precision in representing the prediction error.
4. Encoding and Decoding:
After quantization, the quantized prediction error is encoded using entropy coding techniques, such as Huffman coding or arithmetic coding. At the receiver's end, the received coded quantized prediction error is decoded and used to reconstruct the prediction error.
5. Reconstruction:
The quantized prediction error is added to the predicted sample at the receiver's end to reconstruct the original signal sample. This reconstructed sample is then used for prediction in the next time step.
Conclusion:
In Differential Pulse Code Modulation (DPCM), the difference of the message signal sample with its predictions is quantized. This difference represents the prediction error, which is encoded and transmitted to reconstruct the original signal at the receiver's end. DPCM takes advantage of the correlation between adjacent samples to improve compression efficiency compared to regular Pulse Code Modulation (PCM).
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Which one of the following statements about differential pulse code modulation (DPCM) is true?a)The sum of message signal sample with its prediction is quantizedb)The message signal sample is directly quantized, and its prediction is not usedc)The difference of message signal sample and a random signal is quantizedd)The difference of message signal sample with its predictions is quantizedCorrect answer is option 'D'. Can you explain this answer?
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Which one of the following statements about differential pulse code modulation (DPCM) is true?a)The sum of message signal sample with its prediction is quantizedb)The message signal sample is directly quantized, and its prediction is not usedc)The difference of message signal sample and a random signal is quantizedd)The difference of message signal sample with its predictions is quantizedCorrect answer is option 'D'. Can you explain this answer? for Electronics and Communication Engineering (ECE) 2024 is part of Electronics and Communication Engineering (ECE) preparation. The Question and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus. Information about Which one of the following statements about differential pulse code modulation (DPCM) is true?a)The sum of message signal sample with its prediction is quantizedb)The message signal sample is directly quantized, and its prediction is not usedc)The difference of message signal sample and a random signal is quantizedd)The difference of message signal sample with its predictions is quantizedCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which one of the following statements about differential pulse code modulation (DPCM) is true?a)The sum of message signal sample with its prediction is quantizedb)The message signal sample is directly quantized, and its prediction is not usedc)The difference of message signal sample and a random signal is quantizedd)The difference of message signal sample with its predictions is quantizedCorrect answer is option 'D'. Can you explain this answer?.
Which one of the following statements about differential pulse code modulation (DPCM) is true?a)The sum of message signal sample with its prediction is quantizedb)The message signal sample is directly quantized, and its prediction is not usedc)The difference of message signal sample and a random signal is quantizedd)The difference of message signal sample with its predictions is quantizedCorrect answer is option 'D'. Can you explain this answer? for Electronics and Communication Engineering (ECE) 2024 is part of Electronics and Communication Engineering (ECE) preparation. The Question and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus. Information about Which one of the following statements about differential pulse code modulation (DPCM) is true?a)The sum of message signal sample with its prediction is quantizedb)The message signal sample is directly quantized, and its prediction is not usedc)The difference of message signal sample and a random signal is quantizedd)The difference of message signal sample with its predictions is quantizedCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which one of the following statements about differential pulse code modulation (DPCM) is true?a)The sum of message signal sample with its prediction is quantizedb)The message signal sample is directly quantized, and its prediction is not usedc)The difference of message signal sample and a random signal is quantizedd)The difference of message signal sample with its predictions is quantizedCorrect answer is option 'D'. Can you explain this answer?.
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