DC stands for Data Compression. DC is a digital signal process in which data to be transmitted is compressed to reduce the storage amount in bits. In other words, you can say that data storage space is reduced than usual after applying DC. Data transmission greatly reduces data storage space and transmission capacity. It is also known as source coding or bit-rate reduction. Database management system, backup utilities, etc use data compression method widely. There are many file compression methods but ZIP and ARC are mostly known file formats.
DC: Data Compression
Two Parts of DC
- Lossy: In lossy compression method, some part of data is deleted or lost. Because it identifies and then delete the unnecessary information before transmission.
- Lossless:In lossless compression method, compression is done through identifying and eliminating any statistical redundancy. For instance, when we encode a data source before transmitting it, its size is effectively reduced and data also remains intact and unchanged.
Benefits of Data Compression
- Faster file transfer: It improves the speed of file transfer as less bandwidth is required to download the compressed files.
- More Storage Capacity: It allows you store more files in the available storage space, e.g. Lossless compression can reduce a file to 50% of its original size.
- Reduces Cost: It allows you reduce the cost of storing data as after compression, you can store more files in the given storage space.
- Reduces latency: On tape, the small file images can be scanned faster to reach a specific file that reduces latency.
DC: Direct Current
DC can also be abbreviated as Direct Current. Direct current can be defined as electric charges (electrons) flowing in one single direction, i.e. from an area of negative charge to an area of positive charge through a conductor like a metal wire. The intensity of the current may vary but the direction remains the same. It is produced by sources such as DC generators, batteries, solar cells and power supplies. When you will draw a DC graph, it will look like a flat line. DC is used to charge batteries and work as power supply for electronic devices and is mostly used in low voltage applications. It was the first power to be transmitted commercially, but now it has been widely replaced by AC current.
To convert AC to DC we use rectifier, and to convert DC to AC we use inverter.
- Most equipments are generally more efficient when powered from DC
- Less risk of electric shocks when voltage is below 48 Volts
- Over long distances, DC transmission line can transmit more power with less electricity losses. It also improves efficiency and lowers the transmission cost.
- DC transmission lines require less land, narrow supporting structure (smaller footprints) as compared to AC lines.
- Domestic:Most electronic circuits use DC power supply.
- Automotive:Automotive systems mostly use DC of 12 V but some uses 6 V or 42 V DC.
- Telecommunication:Higher DC voltages like 48V to 72V power can be converted to lower DC voltages like 36V, 24V, 18V, 12V, 5V through a DC-DC converter and can be used for telecommunications system.
- High-Voltage power transmission: DC is used for the bulk transmission of electric power from a high-voltage direct current.