Delta modulation (DM) is a type of analog-to-digital conversion technique that samples an analog signal at a constant rate and quantizes the difference between the sampled value and the previous value. This quantized difference, also known as the delta or step size, is then encoded and transmitted to the receiver.
At the receiver side, the encoded delta signal is decoded and added to the previous output to obtain the current output. Due to the use of only one bit for encoding, DM results in a simple and low-cost implementation, but it has some drawbacks such as quantization noise and signal distortion.
To overcome these limitations, variations of DM such as adaptive delta modulation (ADM) and differential pulse-code modulation (DPCM) have been developed. ADM adjusts the step size according to the input signal level, while DPCM encodes the difference between the input signal and a predicted value. These methods improve the performance of DM, making it more suitable for applications such as audio and video compression.
Delta Modulation
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