What is a digital T.V. channel broadcasting? in simple language.

Television : The word television means "To see at a distance".  In this, it is sound while distant.  At this time,mike hill of the sound wave is in the electric wave. while T.V. The electrical wave of the image's focused image with the camera.  Conversion is done.  Both of these independent electric waves are transmitted to the air in the form of electromagnetic waves, modulating the frequencies of a particular channel.  Or Wave are received by the receiving antenna of the T.V.

Principles of Television: The fundamental problem with television was that.  What should be the technology that transmits both sound and video simultaneously and receives long distance receivers?  Radio technology for sound was in use at that time.  But that technology was not so easy to use for video.

      This was a major problem in the creation of T.V. Because how to transform a picture information into an electrical signal? Photo sensitivity material was discovered at this time. Photo sensitivity material is one such substance. At which light rays are hit, electrons are emitted less and less in the form of light ray intensity.  The first camera tube was created using such photo sensitivity material. With the help of this camera tube, the optical image is converted into electrical signal.  The following is the basis for picture transmission.

     As a cinema projector, the entire frame is simultaneously in electrical signal  Conversion was impossible.  For this, the principle of converting the whole frame into numerous small dots was done by converting the picture into an electrical signal and then converting it into a picture.

Picture element:  1 of the most commonly used photo sensitivity material.  5 lakh points are placed on the image plate of the camera tube.  The same points are placed on the face plate of the picture tube.  The diameter of each of these points is 0.3 mm2.  With such a number of points, the picture is converted into electrical signal and electrical signal is re-imaged. This point is called Picture Element.

Scanning: Image has although split into 2 million points, it is not possible to simultaneously convert the image taken on the camera plate through the camera lens into an electrical signal which we are going to call a video signal, so each point is individually converted into a video signal.  This is called scanning.  The human eye reads like a book. Likewise, the electron beam picture box in the camera tube reads horizontally and vertically in a very fast way.  One at a time.  This is called scanning in the classical definition.

Types of scanning: two types of scanning in this field.
1. Progressive scanning system
2. Interlace scanning system

Vertical & Horizontal Frequency): The electron beam reads 25 frames a second. In India, using the interlaced scanning system method, one field reads two fields as odd and even in one frame.  As a result, the electron beam performs vertical movement 25 x 2= 50 times a second. Therefore, the vertical frequency is 50 Hz. Yet reading 25 frames of 625 lines in a second. As a result, the electron beam performs horizontal movements 25 x 625= 15625 times a second.  Therefore the horizontal frequency is 15625 Hz.

T. V. Transmitter: The word broadcast means to transmit in all directions.
There are three sections of television broadcast.
1. Video section
2. Audio section
3. Combining network.

     The video section is transformed into a visual image by electrified video.In this method, the audio section can be converted to audio F.M.The modules are modulated in a manner and integrated into a combining network in the form of specific channel frequencies and transmitted via a single transmitter antenna.  The service area or range of a non-transmitter antenna is 60 km from the transmitter antenna.Until the end.  This means that the transmission is 120km from the transmitter antenna in all directions.Until the end.

Broadcasting of T.V. channel: The frequency with which the band is used to transmit the audio and video signals are called T.V. Channels. Frequencies greater than 40 MHz. T.V. signals are radiated. Band 1: -41 to 68 MHz.
Band 2: - 174 to 230 MHz.
S band: - 104 to 4 174 MHz. which is known as the V.H.F. band.
Hyper Band: - 230 to 470 MHz
Band 4: - 470 to 582 MHz - 21 to 36 channels which is known as the U.H.F. band.
Band 5: - 37 to 69 channels = 606 to 870MHz channel width = 8 MHz.
Band 2 is 80 to 108 MHz and used for F.M. transmission.  T  V  In India, Band 1 and Band 2 are used for transmitters.  Each band splits into a few channels.  The channel width in India is 7 MHz.

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