Negative modulation means for maximum luminance zero carrier power is transmitted. This helped in reducing impulsive noise which produced spots on screen and also synchronizing pulse has maximum carrier power so its is relatively easy for AGC (Automatic Gain Control) to pick it up and provide constant voltage output to drive rest of the TV circuits.
Amplitude Modulation (AM) is used for the picture portion of a television transmission while Frequency Modulation (FM) is used for the audio portion.
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
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.
The video is AM and the audio is FM.
what is the modulation used in telivision for audio signals
Modulation is the process of varying a carrier signal's properties, such as amplitude, frequency, or phase, to encode information for transmission. In communication systems, modulation is used to efficiently transmit data over long distances by converting the information into a form that can be carried by the carrier signal. Two examples of how modulation is utilized in modern technology are: In Wi-Fi technology, modulation techniques like Quadrature Amplitude Modulation (QAM) are used to encode digital data into radio waves for wireless communication between devices. In digital television broadcasting, modulation methods such as Vestigial Sideband Modulation (VSB) are employed to transmit audio and video signals over the airwaves for high-quality TV reception.
importance of voice modulation in radio
In television system for video transmission AM is used and for audio transmission FM is used....
In cable TV, we use frequency multiplexing but in DTH, we use PCM along with quantization.
ya, it can be negative because as m=Vm/Vc , the value of Vm if taken in negative then modulation index can be naegative
Television Broadcasting