# What is interpolation and decimation?

## What is interpolation and decimation?

Decimation and interpolation are the two basic building blocks in the multirate digital signal processing systems. The decimator is utilized to decrease the sampling rate and interpolator to increase the sampling rate.

**What is decimation process?**

Decimation is the process of reducing the sampling frequency of a signal to a lower sampling frequency that differs from the original frequency by an integer value. Decimation also is known as down-sampling.

### What is interpolation in signal processing?

In the domain of digital signal processing, the term interpolation refers to the process of converting a sampled digital signal (such as a sampled audio signal) to that of a higher sampling rate (Upsampling) using various digital filtering techniques (for example, convolution with a frequency-limited impulse signal).

**What is difference between downsampling and decimation?**

Loosely speaking, “decimation” is the process of reducing the sampling rate. In practice, this usually implies lowpass-filtering a signal, then throwing away some of its samples. “Downsampling” is a more specific term which refers to just the process of throwing away samples, without the lowpass filtering operation.

#### What is the purpose of interpolation?

Interpolation is a statistical method by which related known values are used to estimate an unknown price or potential yield of a security. Interpolation is achieved by using other established values that are located in sequence with the unknown value.

**What is Prewarping in DSP?**

pre-warping is the method of solving the problem of warping. in signal processing, and this warping effect is occur when. we convert the signal analog to digital form we cant get. actual linear response ,so for gettimg beter response we.

## What is interpolation in sampling?

In popular music, interpolation (also called a replayed sample) refers to using a melody—or portions of a melody (often with modified lyrics)—from a previously recorded song but re-recording the melody instead of sampling it.

**Why interpolation is used in DSP?**

The primary reason to interpolate is simply to increase the sampling rate at the output of one system so that another system operating at a higher sampling rate can input the signal.

### Why do we oversample and decimate?

Oversampling and Decimation is commonly used in ADC to improve the resolution. This technique requires large number of samples, these extra samples can be achieved by oversampling the input signal. Here oversampling refers to sampling the signal by a factor greater than the bare minimum Nyquist rate.

**Does decimation reduce bandwidth?**

certainly downsampling (decimation) reduces the available bandwidth. if there is information at frequencies above the new Nyquist, that information is either lost or aliased (which also loses it).

#### Who uses interpolation?

The primary use of interpolation is to help users, be they scientists, photographers, engineers or mathematicians, determine what data might exist outside of their collected data. Outside the domain of mathematics, interpolation is frequently used to scale images and to convert the sampling rate of digital signals.