A Level Physics-- Digital Signal Processing Part 2, Best Maths and Physics Tutor in UK

A Level Physics-- Digital  Signal Processing Part 2 (Best Maths and Physics Tutor in UK)

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D- type flip-flop: D-type flip flop is a basic component of sequential logic circuit, its transfers the data input value to its output on the positive edge of a clock pulse or its output will not change.   

Jhonson counter: A counter formed from n D-types flip flops, where the Q output of the last flip flop is then fed back to the input of the first flip flop.

How does a Jhonson counter work?

Feeding back the Q output causes a bit pattern to be shifted along with each clock pulse and repeated after a certain count

Modulo-n counter: A counter which counts to be a chosen number by detecting the numbers unique logic states using external logic gates, then sending output to reset the count.

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A Level Physics- Digital Signal Processing Part 1, Best Maths and Physics Tutor in UK

 

A-Level Physics- Digital Signal Processing Part 1 (Best Maths and Physics Tutor in UK)

Are you looking for the Best Maths and Physics Tutor in UK? mathsandphysics-tutor.com is the best maths and physics tutor website in the UK. Today I will discuss the basics of a digital signal.

Logic Gate: The logic gate is an electronic switch that performs a logical function. It gives a 0 or 1 output depending on the logic states of its input. 

Types of the logic gate: There are 6 types of logic gates...

• NOT gate
• AND gate
• OR gate 
• NAND gate
• NOR gate 
• EOR gate 

What does a truth table list?

All logical input states to a logic gate with the corresponding output. 

Boolean Algebra: A mathematical way to describe the logic circuits with logical rules so that truth tables of combinations of logic gates can be determined. 

A . B = A and B 

A+B = A or B

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Analog and Digital signals advantages and disadvantages , Best Maths and Physics Tutor in UK

 Analog and Digital signals  advantages and disadvantages  (Best Maths and Physics Tutor in UK)

Today I will discuss the advantages and disadvantages of analog and digital signals. We are the best Maths and Physics tutor center in UK.

Advantages of digital signals over analog signals

• Digital signals have high immunity to noise so they stay high quality over long-distance transmissions
• Noise is easily removed
• More information can be sent at any one time
• Readily interfaced with digital systems
• Optical transmissions are possible.

Disadvantages of digital signals compare to analog signals

• Information isn't exact, as discrete values are used to form the signal
• Systems for transmission and processing are complex to build than those for analog.  

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A Level physics- Analog Signal Processing, Best Maths and Physics Tutor in UK

 

A-Level physics- Analog Signal Processing (Best Maths and Physics Tutor in UK)

 In the previous lecture, I have tried to give a clear concept of Analog and Digital signals. Today I will discuss about the processing of analog signals. We are the best Maths and Physics tutor center in UK.

Filter circuit: A circuit that can select certain frequencies from a mix of AC frequencies in the circuit. In a stereo system, high frequencies go to another speaker and low to another. 

LC Parallel: A circuit with an inductor L ( stores energy as a magnetic field ) and a capacitor connected in Parallel. 

Inductance: A measure of coil resistance to current changing. The unit of inductance is Henry. A coil has a 1 H inductance when the current changing at 1A per second induces a voltage of 1V across it. 

State the stages of operation of an LC Circuit.

1. Capacitor charges as the switch are at ‘a’

2. S disconnected and the capacitor stores electrostatic potential energy.

3. S at ‘b’ capacitor discharges its energy stored as the magnetic field starts to collapse so emf induced in opposite direction (Lenz's Law)

4. Capacitor recharges with opposite polarity and cycle repeats.

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A- Level Physics- Analog and Digital Signals, Best Maths and Physics Tutor in UK

A-Level Physics-  Analog and Digital Signals (Best Maths and Physics Tutor in UK)

We are the best Maths and Physics tutor center in UK. Today we will discuss a very important topic in Physics which is Analog and Digital signals.

An analog signal is any continuous signal for which the time-varying feature of the signal represents some other time-varying quantity. A digital signal is a signal that represents data as a sequence of discrete values.

 Differences between Analog and Digital signals

1. Analog signals are continuous, digital signals are discontinuous.

2. Digital signals have two states, high and low.

What is a bit?

A bit is a basic information unit that can either be 1 or 0. A byte is a unit of digital information. The byte consists of 8 bits. 

Define the sensitivity, resolution, and response time of sensors that produce an analog output. 

Sensitivity: Change in output quantity/ unit change in input quantity. 

Resolution: Smallest change in the quantity that can be measured, given as a ratio of the change to the value measured.

Response time: The time is taken to completely respond to a change in input. 

How does an analog to digital converter work? 

Sampling: Analog signal passes into a sampling gate which samples signal value in equal intervals determined by an external clock pulse. Each decimal sampled value is converted into binary form and the corresponding digital signal is sent. 

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