# What is a high shelf filter?

EQ: Using a

**Filter**vs a**Shelf**. In the picture above you can see both a**high**-pass**filter**and a low frequency**shelf**. A**high**-pass**filter**actually**filters**out the low frequencies entirely. The curve slopes downward at a specific “steepness.”A.

### Why notch filter is used?

In signal processing, a band-stop

**filter**or band-rejection**filter**is a**filter**that passes most frequencies unaltered, but attenuates those in a specific range to very low levels. It is the opposite of a band-pass**filter**. A**notch filter**is a band-stop**filter**with a narrow stopband (high Q factor).#### What is the stop band?

A**stopband**is a**band**of frequencies, between specified limits, through which a circuit, such as a filter or telephone circuit, does not allow signals to pass, or the attenuation is above the required**stopband**attenuation level.#### What is a band pass filter?

A**band**-**pass filter**(also**bandpass filter**, BPF) is a device that passes frequencies within a certain range and rejects (attenuates) frequencies outside that range.#### What is the difference between a node and a junction?

"**Node**" is refers to any point on a circuit where two or more circuit elements meet. whereas**junction**is any point where electrical conductors are joined electrically. or two**nodes**to be**different**, their voltages must be**different**.A**node**usually corresponds to a**junction**physically.

B.

### What is the order of the filter?

**Filter Order**. The maximum delay, in samples, used in creating each output sample is called the

**order**of the

**filter**. In the difference-equation representation, the

**order**is the larger of and in Eq.(5.1). For example, specifies a particular second-

**order filter**.

#### What is a finite impulse response filter?

In signal processing, a**finite impulse response**(FIR) filter is a filter whose**impulse response**(or**response**to any**finite**length input) is of**finite**duration, because it settles to zero in**finite**time. FIR filters can be discrete-time or continuous-time, and digital or analog.#### Is a Butterworth filter FIR or IIR?

Although almost all analog electronic**filters**are**IIR**, digital**filters**may be either**IIR**or**FIR**. Thus digital**IIR filters**can be based on well-known solutions for analog**filters**such as the Chebyshev**filter**,**Butterworth filter**, and Elliptic**filter**, inheriting the characteristics of those solutions.#### What is IIR filter in DSP?

**IIR filters**are one of two primary types of digital**filters**used in**Digital Signal Processing**(**DSP**) applications (the other type being FIR). “**IIR**” means “Infinite Impulse Response.”

C.

### What are Butterworth filters?

The

**Butterworth filter**is a type of signal processing**filter**designed to have a frequency response as flat as possible in the passband. It is also referred to as a maximally flat magnitude**filter**.#### What is a band pass filter?

A**band**-**pass filter**(also**bandpass filter**, BPF) is a device that passes frequencies within a certain range and rejects (attenuates) frequencies outside that range.#### What is a group delay?

In signal processing,**group delay**is the time**delay**of the amplitude envelopes of the various sinusoidal components of a signal through a device under test, and is a function of frequency for each component. Phase**delay**, in contrast, is the time**delay**of the phase as opposed to the time**delay**of the amplitude envelope.#### What is active high pass filter?

A first-order (single-pole)**Active High Pass Filter**as its name implies, attenuates low frequencies and passes**high frequency**signals. It consists simply of a passive**filter**section followed by a non-inverting operational amplifier.

Updated: 5th October 2018