Contrast delta modulation PCM and standard PCM.

Delta Modulation PCM (DM-PCM) and Standard PCM (Pulse Code Modulation) are both methods of converting analog signals into digital signals, but they differ in several ways:

1. Complexity: Standard PCM is more complex than DM-PCM. In PCM, the analog signal is sampled, quantized, and then encoded into a digital signal. On the other hand, DM-PCM is a simpler process where the difference between successive samples is encoded, not the actual sample values.

2. Bandwidth: PCM requires a larger bandwidth than DM-PCM. This is because PCM transmits the entire quantized signal, while DM-PCM only transmits the difference between successive samples, which requires less data.

3. Signal Quality: PCM generally provides a higher quality signal than DM-PCM. This is because PCM encodes the actual sample values, while DM-PCM only encodes the difference between samples. This can lead to a loss of information in DM-PCM, resulting in a lower quality signal.

4. Noise: PCM is more susceptible to noise than DM-PCM. In PCM, noise can affect the quantization and encoding process, potentially leading to errors in the digital signal. In contrast, DM-PCM is less affected by noise because it only encodes the difference between samples, not the actual sample values.

5. Application: PCM is commonly used in applications where high quality audio is required, such as music and voice transmission. DM-PCM, on the other hand, is often used in applications where bandwidth is limited and signal quality is less of a concern, such as in telephony and video conferencing.