Computer Fundamentals Index

Computer Introduction Types of computer Characteristics of computer Uses of computer History of Computers

Computer Languages

Low Level language Middle level Language High level language

Computer Generation

Generation of Computers First Generation of Computer Second generation of Computers Third generation of Computers Fourth generation of Computers Fifth generation of Computers Sixth Generation of Computer

Peripheral Devices

Input devices Output device


Block diagram and basic components Control processing unit (CPU) Software Hardware


Computer Memory Registers Memory Hierarchy RAM Vs ROM Understanding file sizes (Bytes, KB, MB, GB, TB, PB, EB, ZB, YB)

Computer Network

Types of Network Types of Area Networks (LAN, WAN, MAN) TCP Flags

Computer Virus

Computer Virus

Computer Ports

Computer Ports


How to hack a computer How much do Computer Programmers make How does a Computer work How to associate a file with a program How does a computer convert text into binary How does a computer process data into information How to fix a CD-ROM DVD How to fix the no input signal How to install computer memory How to associate a file with a program How to log out of your operating system How do I change my name on Google How to installation or uninstallation Microsoft Paint How to fix a not a valid Win32 application error How to fix missing Microsoft Windows .dll files How to use a computer keyboard How to erase my hard drive and start over How can I test how many words I can write a minute How to shut down a computer How do I open and edit the Windows registry How to edit the registry from the command line How to restart Microsoft Windows How to install a computer processor How to open Microsoft Paint How to fix problems in Windows after installing new software How to enable or disable the preview pane of Microsoft Outlook How to open a Microsoft .wps or Works file in Word How to view the HTML source code in Microsoft Word How to View or Change the Screen Resolution of a Monitor How to Connect and Install a Computer Keyboard How to Delete Temporary Files in Windows 10 How to determine Which Version of Microsoft Office I'm using How to find out how much hard drive space is available How to Fix PC Stuck on Verifying DMI Pool Data How to choose which items show in the notification area How to find similar images using Search by Image How to fix Low Memory and out of memory errors How To Replace the CMOS Battery How do I Update my Antivirus Program How to fix a general protection fault How to Identify problems in the Windows Device Manager How can the Base be Shown How to test if a Website or Web Page is down How Much is 1 Byte, Kilobyte, Megabyte, Gigabyte, etc How to fix a CMOS checksum error How to Fix a Windows CD-ROM, DVD, or Disc Drive Issue How to Open Safe Mode How to Password Protect Files and Folders in Windows How to Reset CMOS or BIOS Settings How to use Computer Keyboard How to create a text file How to enable or disable DHCP in Windows How to test computer memory to determine if its bad How do double space or change line spacing in Microsoft Word How do I know if I have Windows Administrator Rights How many cores does my computer have How to Create a Directory or Folder How to Enter and Exit the BIOS or CMOS Setup How to change Windows Compatibility mode How to clear your internet browser history How to Connect Computer Speakers How to Copy a Web Page Link or URL How to install a Hard Drive or SSD How to Open the Windows Control Panel How to split a screen in Windows How to copy text from a scanned PDF


Who invented Computer What are the advantages of the Internet? What are the disadvantages of the Internet? Is my computer 64 bit? What is Edge Computing? What is a Router? What is Monitor What is Printer What is a Web Browser What is Microphone What is a Webcam What is PC What is Keyboard What is Motherboard What is WAP What is URL What is a Digital Assistant When was the first Computer Invented What is Modem What is Firmware What is Imperative Programming What is Protocol What is Safe Mode What is Device Driver What is Hybrid Topology What is Mesh Topology What is Procedural language What is a hyperlink What is a Username Who invented the Internet What is Video Card What is Sound Card What is Binary What does Alt+B do What does Alt+D do What does Alt+E do What does Alt+Esc do What does Alt+R do What does ALT + Q do What does Alt + Tab do What is Data Manipulation What is a touch screen What is Back Panel What is Analog Monitor What is AR lens What is an ATX Style Connector What is a File System What is Hard Disk Drive (HDD) What is a boot device What is accessibility What is Line In What is network Interface card (NIC) What is Optical Disk Where can I ask questions on the internet What is Auto Rotate What is CAD (Computer-aided design) What is Cable Modem What is Home Page What is boot menu What is braille reader What is flash memory What is Windows What is Clipboard What is Cyber Warfare What is Myspace Why has my IP address changed What is Jacquard Loom My computer is running slow, what steps can I do to fix it What is a Kensington Lock What is a multicore processor What is automation Are smartphones and tablets computers What is a Login Script What is a Loosely Typed Language What is Multitasking? Why my computer monitor shows no display or black screen What is REM What is Parallelization What is Overtype mode What is open with What is Bracket What is an Online Service What is REM What is Parallelization What is Overtype mode What is open with What is Bracket What is an Online Service What is the Pg Dn Key (Page Down Key) What is the Pg up Key (Page up Key) What is Palmtop Computer What is a Processing Device What is a Print Preview What is the Print Screen Key What can I do if my computer or laptop is lost or stolen What is a Model Number What are the currently available antivirus programs What are Toggle keys What is a Case fan What is a Silicon Chip What is a Slate PC What is a TAB stop What is an Octothorpe What is Task Pane What is Task View What is the svchost.exe file used for in Windows Where can I find free online virus scanners Why am I unable to increase the resolution in Windows What is Autofill When I click my mouse, it sometimes double-clicks What is Scratch What is UDIMM What is MsConfig What is an Expansion Card What is an Executable File What is an Elevated Command Prompt What is an AC Adapter What is AIMBOT What is a Software Suite What is a LED Monitor What does Alt + X do What does alt + space do What does Alt + O do Now that I’ve got a Computer, what can i do What is a Punch Card What is RDIMM What is Select All What is Serial number What is Thermos flask What programs can I use for speech recognition What are the Advantages of Computers What are the Disadvantages of Computers What does Alt + T do What Hardware Device Drivers should be Updated What is a Desktop What is a Ring Topology What is CMOS What is a Directory What is a Mechanical Mouse What is a Plotter What is a Variable What is an Icon What is Data What is HDMI What is Remote What is Right-Click What is SMPS Why does my Laptop not turn on What is a Copyright What is a Cordless Mouse What is a CSV file What is a Joystick What is a Start Button What is a Taskbar What is an Alignment What is an Output Device What is Cat 5 What is Google Chrome What is Post What are Recordable DVD Drives What Does Alt + F4 Do What Does Alt + L Do What is a bit (Binary Digit) What is a cable What is a Calculator What is a capacitor What is a Cold Boot What is a Dialog Box What is a Dual-boot What is a Slide What is A4 What is AM What is Barcode Reader What is EHCI What is a Header What is a Joystick What is a Secondary Storage Device What is Access Time What is Account Sharing What is an Asterisk What is Asynchronous DRAM What is Back Quote What is BIOS What is Borderless Printing What is Case Badge What is CD-ROM What is Chat Slang What is Composite What is RJ Cable What Are Bottom Row Keys What is SAN What is Tray What is VDU What Does Alt + M Do What Does Alt + P Do What is a Cell What is a Command Key What is a key Combination What is a Menu Bar What is a Startup What is a T What is Chat What are the F1 through F12 keys What does Alt + Enter do What Does Alt + Home DO What does Alt + R do What does Ctrl + B do What Does Ctrl + Enter Do What Does Ctrl + R Do What does Ctrl + G do What does Ctrl + 9 do What does Ctrl + End do What does Ctrl + O do What Does Ctrl + P do What Does Ctrl + Q do What is a Colon What is a Core What is Apple Touch Icon What is Clock What is Code What is Computer Crime What is Ctrl What is DAT What is Data diddling What is Date Why won't my computer turn on What Does Alt + N Do What does ctrl + 2 do What does ctrl + space do What does Ctrl + W do What does Ctrl + T Do What Does Ctrl + 2 do What does Ctrl + 5 Do What are the most common file types and file extensions What are Sticky keys What Does Ctrl + Shift + Esc Do What is Settings What is Task Manager What is Taskbar What is a DNS Resolver What does ctrl + 1 do What does ctrl + 0 do How to install software What is a Folder What is a Legend What is a MAC Address What is a Path What is a Ruler What is a Toolbar What is an Intranet Meaning and Differences with Internet What is an SSD What is Inheritance What is Tablet What is Depth What is Docking Station What is Double Click What is a Solid Ink Printer What is a Temporary File What is Backup and Restore What is Electronic Payment Systems Eps What is Marshalling


Difference between hardware and software Difference between multiprocessor and distributed systems Difference between Desktop and Laptop Difference between File and folder Difference between Hard Copy and Soft Copy Open Source Programs vs Closed Source Programs Difference between Optical Fibre and Coaxial Cable Difference between Website and Webpage Difference between Classes and Objects Input VS Output Difference between Primary and Secondary Storage with Examples


Quantum Computing Computer Software Autoexec.bat and config.sys info Update an Antivirus Use of Internet Advantages and disadvantages of Email Computing Power Internet Explorer Shortcut Keys Advanced Encryption Standard (AES) Augmented Reality Infrastructure Readiness Check Top 10 Internet tips and tricks Introduction and Features of FoxPro Features of Multimedia Top 10 online services and applications Receiving S.M.A.R.T. status bad backup and replacing error Version Control System Uninstalling Software or Apps in Windows Data Warehouse Increase or decrease font size in Word using keyboard shortcuts Mouse not detected or working in Windows Computer Cleaning Information and Steps Function Keys on Keyboard Windows 7 Alt+Tab won’t stay on top or stick 10 Essential Examples of Web Browsers Binary Subtraction using 2’s Complement Case Sensitive Languages Computer Pioneers and people who are CEO Microsoft Word Shortcut Keys Parts of Computers Names, Definitions and Images ROM and its Types Basics of Information Technology Characteristics of a Good Software Design Characteristics of Management Information System Classification of Management Information System Implementation of MIS Input Devices of Computer Definition Limitations of Management Information System 3 Types Of Network in Computer Block Diagram Of Control Unit

What is Line In?

Basically, Line-In is an audio jack that is present in an audio device, which is used to connect the other audio output and input devices like speakers, microphones, etc. A digital or analog line-in can be used. The main purpose of the Line In jack is to help with audio recording or to distinguish incoming audio. Line In can also be said as Audio In or Mic In.

Before the study of line in we have to learn about the audio signal through which we can learn the line-in in brief.

What is an Audio Signal?

What is Line-In?

An audio signal is a representation of sound that is typically made up of a series of binary digits or, in the case of analog signals, a changing level of electrical voltage.

We use voltage to measure audio signals, which then feed into mixers, interfaces, and amplifiers before sending them to our speakers. One of the most important components of studio setup is understanding the various levels and properly connecting our equipment.

We will go over some technical jargon related to the signals, such as the estimated voltage and how it's quantified in dBV/dBu. These are just numbers that are simple to comprehend, even if you don't understand the underlying complexities.

For our purposes, the goal is to understand the underlying differences between line level, mic level, instrument level, and speaker level.

Types of Audio Signal

  • Mic Level
  • Line Level
  • Speaker Level
  • Instrument Level
  1. Mic Level: The microphone is much quieter now. It normally lives in the range of 1 to 10 millivolts, or -60 to -40 decibels. Mic level, as the name says, is what we get from a microphone connected to our system through XLR. To bring it up to line level, it must be amplified.
    The output level of the mic may be hotter or colder, depending on the model. You could also claim that some microphones are more "sensitive" than others, requiring less preamp gain to achieve a safe level. Pads are built into many higher-output microphones to prevent them from clipping when used with stronger sound sources.
  2. Line Level: The loudest signal we deal with in audio is line level. It is about 1 volt, or 0 dB volt, in terms of voltage. Line level generally passes through the system after the preamp stage and before the output to our speakers. The mic level is proportional to the line level. For recording and playback, we need to raise the mic level to line level. Another thing to keep in mind:
    • -10dBV is the level for customer products like CD players
    • +4dBu is the level for professional equipment like preamps, mixers, and outboard gear. On a VU meter, +4 dBu equals 0 (fun fact).
  3. Speaker Level: We have finally arrived at speaker level. Speaker level is the point at which all of our signals have been amplified to line level and are ready to be output to our speakers. Because the voltage is so high, you will need to utilize special speaker cables to ensure that the signal gets securely from your interface to your speakers.
  4. Instrument Level: The mic and line levels are balanced for the instrument. These signals are generated by an instrument such as an electric guitar or a bass. Some interfaces have dedicated "Hi-Z," or high impedance, 1/4'' inputs for attaching instruments. Others use hybrid XLR/1/4'' inputs that let you choose whether to plug in a microphone or an instrument.
    To achieve line level, instrument levels require a little preamp amplification.

Line Level

Line level refers to the normal strength (amplitude) of audio signals from mixers, signal-processing devices, and other consumer and professional audio equipment. Consumer and professional line levels are the two sorts of line levels. A signal with a level of -10 dBV is commonly referred to as consumer line level (0.316). Consumer-level equipment includes CD players and DVD players, for example. Signal-processing equipment and professional mixing consoles, for example, are examples of professional line-level equipment.

Is Line Level Signal Balanced or Unbalanced?

The line-out and Line ports handle line-level audio signals. Line level signals are signals transferred between audio components such as audio amplifiers, mixers, televisions, and DVD players.

Technically, line-level signals can be balanced or unbalanced. This is affected by the type of cable used to transmit or carry the line-level signal. Line level signals are usually unbalanced and transmitted by most 1/4'' and RCA cables. Line-level signals transmitted by 14 TRS connections, on the other hand, are balanced signals.

Noise and interference are less likely to affect balanced signals. The audio connection and cable determine whether an audio signal is balanced or unbalanced. It makes no difference which port the connector is placed into.

Inside the plastic outer shell of balanced audio cables are three conductors. The signal wires are two of these lines, while the ground wire is the third. These two signal lines send out two identical copies of the same signal but with different polarities.

Unbalanced cables, on the other hand, have only two conductors inside the outer covering of the plastic. The signal and ground wires are connected by these two wires. Noise is more vulnerable to unbalanced wires than to balanced cables.

Explanation of Line In

Most audio devices and systems have at least one line-in. Line-In jack uses in the opposite fashion in all the audio devices. When you are on a computer then, the line-in is directly connected to the sound processor or to the sound card of the system. In the computer, there is functionality to reduce the volume and configure another setting at the line-in level.

In most audio devices, the line-in jacks are present on the top, back, or sides. But in the case of the system, basically, it is present in the backside. And in the case of a laptop, it is present on the front side of the laptop. The look of the line-in port is similar to the headphone port, but there is one difference is that the latter is depicted by a headphone logo, but the former is represented by a circle with two inward-facing triangles, and it is in blue color.

The electronic signal is present at the line level. The line-in jack can be used to connect any audio device, such as headphones, a portable music player, a microphone, or anything else. When the motherboard only has four or six channels, and the other jacks are absent, the line-in jack can be used to connect rear speakers.

Audio Input

When you are using line-in jacks, then it allows the systems to accept the audio input. This input is frequently your voice, which can be captured using a microphone. But in many cases, the jack also can record the musical instrument. If you want to record the audio, any device can be connected to the line-in port that can be used as a sound recorder, such as Microsoft Sound Recorder, Audacity, or any other sound recorders.

Line Out

A line out is an audio connector port that lets us send line-level audio signals to other devices for processing. Line-Levels signals are generally signal, which is very strong to transmit without any signal drops.

You can find the line-out on keyboards, digital photos, guitar, bass amps or synthesizers, mixers, audio interface, or some others. It helps in audio signal transmission from one device to another.

The line-out from your guitar amp can be utilized to transport the audio from your amp to the mixer at a specific moment. You can use this method to send an audio signal from a mixer's Aux output, which is usually a line-out, to a keyboard amp's input. You can use this method to send an audio signal from a mixer's Aux output, which is usually a line-out, to a keyboard amp's input.

You can also say the line-out as audio out or Sound out.

Difference between Line-out and Line-in

In every audio system, line-in and line-out ports are designed to work in the opposite direction. Causing that the line-out of the one system is connected to the line-in ports of another system.  There is also some technical difference between line-in and line-out that are following:

Point of ViewLine-InLine-Out
Signal DirectionBasically, the lie-in port is used to input the audio signal or receive a line-level audio signal from another device. So, a Line-in port is used to bring the signals into a device.Output ports for sending line-level audio signals to external devices are known as line-out ports. So a Line-out port is used to transmit the audio signals out of the device.
ImpedanceThe term "impedance" refers to the resistance of an electrical component to current flow. Line-in has a higher impedance than line-out connection. Line-out impedance is referred to as the impedance of line inputs is around 10,000 ohms or more.The impedance of line-out is very lower than line-in. Basically, a line-out connection has an output impedance of range 100 ohms to 600ohms.