delta modulator的意思|示意

The term “delta modulator” is a digital coding technique which is used for data transmission in digital networks. It is based on delta encoding and is used for compressing and transmitting data with a low bit rate. In this technique, the source signal is quantized using pulse-code modulation (PCM) and it is encoded using delta modulation.

The basic principle of delta modulation is that the difference between the present sample and the previous sample is encoded and transmitted instead of the sample itself. This makes the data transmission more efficient and reduces the amount of data that needs to be transmitted.

The delta modulator encodes the source signal using a binary code. The source signal is quantized using PCM. The PCM encoded signal is delta encoded by taking the difference between the current sample and the previous sample. This difference is then coded as a single bit and transmitted. The receiver decodes the bits to get the original signal.

The advantages of delta modulation are that it requires fewer bits for data transmission and it has a lower bit rate. It is a simple and efficient encoding technique that can be used in digital networks. It is widely used in cellular networks and satellite communications.

The disadvantages of delta modulation are that it is sensitive to errors in the data transmission. As the data is encoded as single bits, errors can cause the decoded signal to be significantly different from the original signal. This limits its use in applications where a high level of accuracy is required.

Delta modulation is a useful technique for data transmission in digital networks. It enables efficient data transmission with a low bit rate. However, it is not suitable for applications where high accuracy is required.