Analogue TV

Analogue TVs use a technology to represent the objects, persons or sites that resemble the original form and appearance. Analogue processes monitor the conditions such as movement and sound and convert them into analogous mechanical or electronic designs. It is like the telephones that convert the voice vibrations and signals into electrical vibrations of the same shape, quality and volume. Analogue technology uses continuous signals as against the digital which breaks every thing into numbers. The main USP of the analogue techniques is to capture the subtle nature of the real life. It is difficult for the digital techniques to match the granularity of the analogue system without the ever increasing bandwidth and digital capacities.

Analogue technology can be converted into digital form at an early stage and this can facilitate the preservation of the audio and video data indefinitely and copied over and over without any danger of deterioration.

Analog Television Technology

Analogue television technology, like other motion picture techniques, taps into the nature and characteristics of the human eye to create illusion of moving images. The human eye can hold up the image of anything for a fraction of a second. This is called the ‘persistence of vision’, which enables the human eyes to perceive a sequence of images as an integrated moving image. If the movement of the images is slow, for example, if 16 frames move per second, the images would appear jumpy and jerky. This is the reason why frame movement rate is 24 frames per second in motion pictures as it creates an illusion of reality by creating a smooth moving image.

Analogue and Digital TV Signal

Standard analogue TV signals are transmitted like radio signals. The video signals of the analogue TV are sent in AM and its audio signals are relayed in FM which is similar to radio. Analogue TV is vulnerable to the interference of ghosting, snow, distance and the geographical situation of the place that receives the analogue signals.

Digital TV, or, DTV, on the other hand is telecast as data bits of information like the computer data. Thus signal is practically ‘on’ and ‘off’’ which means that the viewer either watches an image or nothing at all. The digital TV transmits the signals in an interlaced form. Therefore there is greater integrity and flexibility of content.