## Block Diagram

Here, you can see the block diagram of Adaptive Delta Modulation.

## Working Principle

As we already learned the working principle of Adaptive Delta Modulation (ADM) depends upon the dynamically adjusting the step size or quantization level used to represent the changes in the input signal. So, here we will learn how each block works.

### Transmitter

Input:

The input of the transmitter is an analog signal that we want to encode and transmit. This signal is the original continuous waveform that carries information.

Logic for Step Size Control:

This is a very important part of the transmitter. It basically determines the step size or quantization level for encoding the differences between consecutive samples of the input signal. The logic for step size control adapts the step size based on the characteristics of the input signal.

One Bit Quantizer:

The one-bit quantizer is responsible for converting the continuously varying amplitude of the input signal into a binary representation. It quantizes the difference between consecutive samples into a binary value for example one bit (0 or 1). This quantized information is then used for transmission.

Accumulator:

The accumulator keeps track of the cumulative sum of the quantized differences. It integrates the quantized values over time, providing a running total. This accumulated value is then used to predict the next sample of the input signal.

Output:

The output of the transmitter is the modulated signal, which consists of the quantized binary values and may also include information about the step size or any necessary control signals. This modulated signal is then transmitted to the receiver through the transmission medium or channel.

Input:

The input to the receiver is the modulated signal which is received from the transmitter. This signal carries the quantized information about the differences between consecutive samples of the original input signal.

Logic for Step Size Control:

Similar to the transmitter, the receiver has logic for step size control. This logic adapts the step size based on the received information, adjusting to the changing characteristics of the transmitted signal.

Accumulator:

The accumulator in the receiver is used to predict the next sample of the input signal based on the received quantized information. It accumulates the received quantized differences to estimate the original signal.

Low Pass Filter:

The low pass filter is applied to the output of the accumulator to smooth out the high-frequency components and reduce noise, providing a more accurate representation of the original signal.

Output:

The output of the receiver reconstructs the analog signal, which ideally closely resembles the original input signal. This reconstructed signal is the output of the Adaptive Delta Modulation system on the receiving end.