In television system for video transmission AM is used and for audio transmission FM is used....
Frequency shift keying
Psk,qpsk
Actually phase modulation was used for the color signal in all analog TV systems.Phase modulation, with some signal preprocessing, was used to indirectly get frequency modulation in many FM transmitters.Certain modems use phase amplitude modulation.etc.
In olden days all radio stations followed only amplitude modulation to propagate the signals. Presently still some of the radio stations follow the same and mostly have switched over to frequency modulation. Especailly in tv transmission the picture signal is propagated only by amplitude modulation.
Television Broadcasting
No and yes. Digital signals are usually square or pulse waves. By Fourier analysis, however, every periodic wave, even a square wave, is the summation of some series (often infinite) of sine waves.
Pole and transmission line hardware is purchased by cable television and utility companies
Amplitude Modulation (AM) is used for the picture portion of a television transmission while Frequency Modulation (FM) is used for the audio portion.
IR transmission type of transmission is used in television system .
IF we use frequency modulation for transmitting video signal this can cause phase shifting .and eyes can percieve this distortion effect easly . and requires more bandwidth to send the signal .Color levels are adjusted by amplitude in TV .So it s more logic to use Amplitude modulation .
In cable TV, we use frequency multiplexing but in DTH, we use PCM along with quantization.
Actually phase modulation was used for the color signal in all analog TV systems.Phase modulation, with some signal preprocessing, was used to indirectly get frequency modulation in many FM transmitters.Certain modems use phase amplitude modulation.etc.
AM and FM
NTSC was the standard used in the US (and some other countries) for transmitting analog color television signals in a backward compatible manner with the original US black and white television signals (developed in 1939 by RCA). It has been superseded by the ATSC digital television standard.It uses the following systems of modulation:vestigial lower sideband amplitude modulation of main carrier with the black and white video signalfrequency modulation of a 4.5MHz subcarrier with the audio signalphase modulation of a 3.58MHz subcarrier with the color signal
Actually phase modulation was used for the color signal in all analog TV systems.Phase modulation, with some signal preprocessing, was used to indirectly get frequency modulation in many FM transmitters.Certain modems use phase amplitude modulation.etc.
Three different modulating techniques are emploed to provide digital television (i.e. satellite, cable, UHF ) and these are known as DQPSK, QAM and COFDM. Each technique is a variation of phase modulation. QAM also takes advantage of amplitude as well as phase changes.
The video is AM and the audio is FM.
In older Microwave link systems they used basic FM or Phase Modulation, modern MW radio links use complex modulation protocols, i.e. 64 QAM, 256 QAM among several other modern modulation types which nowadays enable very large bandwidths and also enables a much more error free end to end signal. These new modulation techniques are also used by your computers Wi-Fi which also operate in the Microwave bands.
what is the modulation used in telivision for audio signals