Wireless audio and video transmission techniques

The technical characteristics of the wireless video transmission systems:

       Wireless video system is a high-frequency electromagnetic signals as a carrier to transmit audio and video signals, so pass
Lose the effect is limited to the electromagnetic wave transmission characteristics, to 1.2GHZ microwave, for example, it's very short wavelength, diffraction performance
Poor, it is not easy to penetrate the barrier, so the best propagation environment is: between the transmitter and the receiver without any cover,
Is the so-called line-of-sight transmission, the effect of wireless transmission of audio-visual equipment and several other factors:

1. The effective height of the transmitter and receiver.

    Radio transmission theory tells us that the higher the height of the transmitter and receiver, the transmission from the more distant, when conditions permit
The case, the transmitter and receiver as much as possible on the height, television and radio stations have been built very high.

2. The use of environmental intensity of electromagnetic interference.

    Serious industrial applications of electromagnetic radiation using a wireless audio-visual equipment, if the transmitter frequency is close to the source of interference 1.2G frequency
Rate of the equipment will cause harmful interference. Wireless audio-visual equipment is FM modulated signal, the receiving end of the frequency discriminator will
Adequate signal-to-noise ratio can be detected in the useful signal, can not be achieved when the useful signal is lost in the ambient noise after wireless
Audio and video transmission.

3. Wireless audio-visual equipment need good power supply

    Power supply is the basic guarantee of any circuit to work, wireless audio-visual equipment power requirements are more stringent, the first
First power supply to meet the operating voltage of the device, the general requirements at 12 volts, the regulator is too high and too low will cause the equipment does not work properly
To make. And power supply ripple coefficient is small enough to consider the battery voltage drops in the use of batteries as a power source will reduce
Transmit power.

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