Analog ( or analogue ) television is the analog transmission that involves the broadcasting of encoded analog audio and analog video signal: one in which the information to be transmitted, the brightness and colors of the points in the image and the sound waves of the audio signal are represented by continuous variations of some aspect of the signal ; its amplitude, frequency or phase.

All broadcast television systems preceding digital transmission of digital television ( DTV ) were systems utilizing analog signals.

Broadcasters using analog television systems encode their signal using NTSC, PAL or SECAM analog encoding and then use RF modulation to modulate this signal onto a Very high frequency ( VHF ) or Ultra high frequency ( UHF ) carrier.

In many countries, over-the-air broadcast television of analog audio and analog video signals is being discontinued, to allow the re-use of the television broadcast radio spectrum for other services such as datacasting and subchannels.

That concept is true for all analog television standards.

When analog television was developed, no affordable technology for storing any video signals existed ; the luminance signal has to be generated and transmitted at the same time at which it is displayed on the CRT.

Plasma screens and LCD screens have been used in analog television sets.

Many dual system television receivers, equipped to receive both analog transmissions and digital transmissions have analog tuner ( television ) receiving capability and must use a television antenna.

Belarus is switching from an analog to digital broadcast television.

In analog television, chrominance is encoded into a video signal using a subcarrier frequency.

Most American television sets are cable-ready and have a television tuner capable of receiving older analog cable TV ( UK televisions are set up to receive Freeview digital terrestrial broadcasting ).

An analog or analogue signal is any continuous signal for which the time varying feature ( variable ) of the signal is a representation of some other time varying quantity, i. e., analogous to another time varying signal.

For example, in an analog audio signal, the instantaneous voltage of the signal varies continuously with the pressure of the sound waves.

The term analog signal usually refers to electrical signals ; however, mechanical, pneumatic, hydraulic, and other systems may also convey analog signals.

An analog signal uses some property of the medium to convey the signal's information.

Any information may be conveyed by an analog signal ; often such a signal is a measured response to changes in physical phenomena, such as sound, light, temperature, position, or pressure.

The physical variable is converted to an analog signal by a transducer.

An analog signal has a theoretically infinite resolution.

In practice an analog signal is subject to electronic noise and distortion introduced by communication channels and signal processing operations, which can progressively degrade the signal-to-noise ratio.

Converting an analog signal to digital form introduces a constant low-level noise called quantization noise into the signal which determines the noise floor, but once in digital form the signal can in general be processed or transmitted without introducing additional noise or distortion.

Therefore as analog signal processing systems become more complex, they may ultimately degrade signal resolution to such an extent that their performance is surpassed by digital systems.

The main advantage is the fine definition of the analog signal which has the potential for an infinite amount of signal resolution.

An analog signal may be processed directly by analog components, though some processes aren't available except in digital form.

Even if the resolution of an analog signal is higher than a comparable digital signal, the difference can be overshadowed by the noise in the signal.

The video carrier is demodulated to give a composite video signal ; this contains luminance, chrominance and synchronization signals ; this is identical to the video signal format used by analog video devices such as VCRs or CCTV cameras.

The Amiga contains an analog low-pass filter ( reconstruction filter ) which is external to Paula.

A digital panel meter ( DPM ) contains an analog to digital converter and numeric display.

Each helical track contains a single field (' even ' or ' odd ' field, equivalent to half a frame ) encoded as an analog raster scan, similar to analog TV broadcasts.

Videodisc ( or video disc ) is a general term for a laser-or stylus-readable random-access disc that contains both audio and analog video signals recorded in an analog form.

This enzyme causes bacteria expressing the gene to appear blue when grown on a medium that contains the substrate analog X-gal.

A much more efficient solution involves analog preprocessing to condition the signal and reduce its bandwidth so that energy is spent to digitize only the bandwidth that contains useful information.

The controller generally contains a number of -- 99. 225. 141. 50 ( talk ) 22: 10, 27 September 2012 ( UTC ) buttons and directional controls ( such as analog joysticks ) each of which has been assigned a purpose for interacting with and controlling the images on the screen.

The card contains a tuner and an analog-to-digital converter ( collectively known as the analog front end ) along with demodulation and interface logic.

It resembles a Super NES controller and contains two analog sticks placed similarly to Sony's DualShock.

" For example the center of the crater contains impact breccia ( ejected rock which has fallen back into the impact zone and partially re-welded ) that is permeated with permafrost, thus creating a close analog to what may be expected at crater sites on a cold, wet Mars.

Pascal's Pyramid is the three-dimensional analog of the two-dimensional Pascal's triangle, which contains the binomial numbers and relates to the binomial expansion and the binomial distribution.

In areas where analog broadcasts are still active the DVB-T2 multiplex which contains the HD channels is unavailable.

In addition to the two " oscillators ," an HD-1 Program contains a Vector Envelope, Common LFO ( per-program as opposed to per-voice, similar to the modulation LFOs in some early polyphonic analog synths ), two common key tracking generators, KARMA settings, and effects.

The controller generally contains a number of buttons and directional controls ( such as analog joysticks ) each of which has been assigned a purpose for interacting with and controlling the images on the screen.

The interior features an instrument cluster shroud that also contains the navigation screen, with silver effect air vents below, and a square, analog clock within the vents.

It contains herniarin, a methoxy analog of umbelliferone