Signal Processing is a very mathematically oriented and intensive area forming the core of digital signal processing and it is rapidly expanding with new applications in every field of electrical engineering such as communications, control, radar, TV / Audio / Video engineering, power electronics and bio-medical engineering as many already existing analog systems are replaced with their digital counterparts.

However, electronic circuit elements replaced their mechanical and electromechanical equivalents, and digital calculations replaced analog calculations.

NMT is another analog cellular standard that was widely used in Europe, mainly in the Nordic countries, which has now been fully replaced by GSM except for limited use in rural areas due to its superior range.

The 5ESS Class 5 Switch first appeared in Seneca, Illinois ( 815 Area Code ) in 1982, and slowly replaced the 1ESS switch and other electromechanical and analog systems in the 1980s and 1990s.

Thus, if the pair is subsequently reused to support applications that require higher frequencies ( such as analog or digital carrier systems or DSL ), any loading coils that were present on the line must be removed or replaced with one which is transparent to DSL.

In Denmark, DVB-T replaced the analog transmission system for TV on November 1, 2009.

Also during this period, a number of analog / digital hybrid synthesizers were introduced, which replaced certain sound-producing functions with digital equivalents, for example the digital oscillators in synthesizers like the Korg DW-8000 ( which played back PCM samples of various waveforms ) and the Kawai K5 ( waveforms constructed via additive synthesis ).

Using an oversampling design and a modulation scheme called sigma-delta modulation ( SDM ), analog anti-aliasing filters can effectively be replaced by a digital filter.

ATSC replaced much of the analog NTSC television system in the United States on June 12, 2009, replaced NTSC on August 31, 2011 in Canada, and will replace NTSC by December 31, 2015 in Mexico, January 1, 2019 in El Salvador., and by end of 2012 in South Korea.

The earliest CVRs used analog wire recording, later replaced by analog magnetic tape.

The 3708 had lower cost and much better speed and junction leakage characteristics ( vital for an analog multiplexer ), than the Fairchild 3705, the equivalent integrated circuit ( using metal gate technology ), that the 3708 replaced.

Later analog video ( VGA and later ) adapters generally replaced these connectors with DE15 high-density sockets ( though some early VGA devices still used DE9 connectors ).

He replaced the classical Fourier series with a matrix of coefficients, a fuzzed-out quantum analog of the Fourier series.

In addition to the digital electronic climate control that was standard on all Eldorados, the standard analog speedometer and fuel gauges could be replaced with a digital display showing speed in a single, precise, and instant number and a fuel gauge that would read the number of gallons of fuel remaining in the gas tank and another gauge showing approximately how many miles can be driven on it.

The main differences between digital printing and traditional methods such as lithography, flexography, gravure, or letterpress are that no need to replace printing plates in digital whereas in analog printing plates are continuously replaced, resulting in a quicker and less expensive turn around time, and typically a loss of some fine-image detail by most commercial digital printing processes.

On August 2nd, 2007 its analog antenna was replaced by a digital one reducing its height by another 9 meters.

In September 2007 the analog TV-UHF antenna was removed and replaced by a new UHF antenna for DVB-T, reducing the tower's height to 294 m ( 965 ft ).

The F model replaced the older analog guidance system with a solid state version that could operate with the F-15's new pulse-doppler radar.

This analog transmitter was replaced with two UHF transmitters serving Vancouver and Victoria, both with lower coverage areas, but with improved coverage to those particular metropolitan areas.

Four national analog television channels ( two public service and two commercial ) were fully replaced by five public service and three commercial digital television channels on September 1, 2007.

The Garden's earlier analog dial-type game clock, essentially identical in appearance and function to the one used in the Chicago Stadium until 1976, was removed and replaced by an all-digital-display unit created by the Day Sign Company of Toronto in time for the 1970 Stanley Cup playoffs, and remained in use until the Garden's closure.

Aachen's railway station, the Hauptbahnhof ( Central Station ), was constructed in 1841 at the Cologne-Aachen railway line and replaced in 1905, moving it significantly closer to the city centre.

At Woodside the old station buildings still stand disused, and the original platforms have been replaced by accessible low platforms.

A Latin radio station in MIami replaced reggaeton music blocks with freestyle playlists.

" Apollo X " would have replaced the LEM carried on the top of the S-IVB stage with a small space station slightly larger than the CSM's service area, containing supplies and experiments for missions between 15 and 45 days ' duration.

In November 1964, von Braun proposed a more ambitious plan to build a much larger station built from the S-II second stage of a Saturn V. His design replaced the S-IVB third stage with an aeroshell, primarily as an adapter for the CSM on top.

On January 10, 2005, Dolenz replaced Dan Taylor as the morning disc jockey at oldies radio station WCBS-FM in New York.

The Shuttle was originally conceived of and presented to the public in 1972 as a ' Space Truck ' which would, among other things, be used to build a United States space station in low earth orbit in the early-1990s and then be replaced by a new vehicle.

The U. S. Coast Guard maintains a base on St. Paul, but no longer maintains a LORAN-C master station, as the technology has been replaced by GPS navigation.

The station, which was the highest in Japan at, was replaced by a fully automated meteorological system.

The project would also see a footbridge replaced to complete the original station look.

The line itself and the station have since been demolished and replaced with houses ; however it is possible to walk the approximate route.

In 1988, Seikan Tunnel replaced the ferry, but the station was still the connecting point between main line trains and trains for Aomori-Hakodate section.

The plan includes a thorough restoration and reglazing of the arched roof of the original station and the removal of the cramped and congested 1972 extension, to be replaced by an open-air plaza, scheduled for completion in 2013.

The route through central London is via St Pancras International for connections to Eurostar and the East Midlands ; Farringdon, for London Underground's Circle, Metropolitan and Hammersmith & City lines, and Crossrail from 2018 ; City Thameslink, which replaced the demolished Holborn Viaduct station and also has a southern entrance serving Ludgate Circus ; Blackfriars, for other rail services and the Underground District and Circle lines ; and London Bridge, for links to a number of other lines.

In 1882 the Met extended its line from Aldgate to a temporary station at Tower Hill, the District completed its line to Whitechapel and on 6 October 1884 the temporary station was replaced with a joint station and the inner circle was complete.

During the construction of the Jubilee line in the late 1970s, the original motifs on Green Park station were replaced by motifs matching the new design for the Jubilee line platforms.

( The Tavern has not survived, however, and has since been replaced by a small block of flats and a Texaco petrol station.

This was replaced by a semaphore station, which was part of a semaphore line that operated between 1822 and 1847.

The area immediately around Stockwell tube station was extensively rebuilt following the Second World War, and the original domed tube station was replaced first in the 1920s, then again with the opening of the Victoria line in 1971.

This was subsequently replaced by the current station.

On 23 October 1992 the station was shut so that the then 85-year-old lifts could be replaced.

It was one of the last remaining mechanical ' flapper ' display boards at a British railway station and certainly the largest, but was removed from service in September 2007 and replaced by electronic boards.