What are source data-entry devices? Explain

What are source data-entry devices? Explain

Source data entry devices are used for direct data entry to the computer system. These devices provide a quick and efficient way to input data.

Type of Source Data Entry Devices

1.Scanning Devices

1. Barcode Reader 
2. Mark and Character Recognition Devices
3. Magnetic-Ink Character Recognition Reader (MICR)
4. Optical Mark Recognition (OMR)
5. Magnetic Strip 
6. Smart Cards
7. Facsimile Fax Machine 
8. Imaging System

Audio/Video Devices 

1. Audio Input Devices 
2. Video Input Devices 
3. Digital Camera

Write a short note barcode reader:

      Bar code reader uses laser beam to read bar codes. Bar code consists of vertical lines and spaces of different width. It is mostly found on different products in the market. This barcode system is called Universal Product Code (UPC). The bar code represents data that identifies manufacturer and the item.

Barcode readers read barcodes and  translate them into digital signals. The digital signals are then further processed by computer.

Describe the mark and character recognition devices.

Mark and character recognition devices are used to read information printed on paper. These devices convert this information into a form that can be processed by the computer.

MICR: 

   MICR stand for Magnetic-Ink Character Recognition Reader. It is used to read text printed with magnetized ink. It is used by bank for check processing. Each check contains MICR characters at lower-left edge. These characters represent check number, bank number and account number.

OCR:

   OCR stands for Optical Character Recognition. It reads printed characters in particular font and converts them into digital code. Most OCR devices use a small optical scanner to read characters. OCR characters appear on utility bills and price tags in departmental stores.

OMR:

    OMR stands for Optical Mark Recognition. It is also called mark sensing devices. These devices use light beam to read data. The data is converted into digital signals. The signals are then sent to the computer for further processing.

       An OMR device detects marks such as circles and rectangles on specially printed forms. It is often used in multiple choice test such SAT  and GRE. The students answer the questions by filling the circles. The OMR devices reads the answer sheet and evaluates it.