how to send video and sound wire less digital?

[mf1364]

Hi every body
does any body have a schematic or circuit of wire less video door phone ?

 

[biff44]

the basic way is to take the analog video output of the camera and FM modulate a carrier in the 2.45 Ghz range. You can use a separate channel for audio, or some fancy multiplexing scheme to modulate the audio with the video. You then analog demodulate at the receiver.

If you want to do it digitally....it is both easier and tougher. You could take a composite digital output, and FSK modulate a 2.45 Ghz carrier, and the demodulate the 1 bit stream at the receiver. The problem is separating the audio and video, which will need some sort of pretty fast fpga or ucontroller processing.

 

[mf1364]

If you want to do it digitally....it is both easier and tougher. You could take a composite digital output, and FSK modulate a 2.45 Ghz carrier, and the demodulate the 1 bit stream at the receiver. The problem is separating the audio and video, which will need some sort of pretty fast fpga or ucontroller processing.

I want to work digital, do you have any schematic or know any hardware or IC that can help me? what is the best wire less protocol for my request ? I want to send video and sound to 300m digitally

 

[E Kafeman]

Digital video is a bit unspecified. Assume an existing MPEG file that you want to convert to a constant rate bit-stream, TS, and up-convert to a frequency suitable for transmitting. Is that what you want to do?

Should it also include a live stream such as from a camera and some kind of compressing format will it be a bit more complex. There is no such thing as a single chip solution, such as for a FM sound transmitter.

Digital coded high resolution pictures at high frame rate cost enormous bandwidth if transmitted in uncompressed format.
To reduce the need for bandwidth is both compression protocol and more complex modulation methods selected compared to analog video. Composite video/PAL/NTSC is much simpler to transmit, all that is needed is a RF oscillator that can be modulated with with the analog video stream. At least in its simplest form.
A cheap digital alternative is to buy this USB dongle. It is still a lot more complex to use then corresponding TV-receiver to handle.
If it is a low resolution camera or if it is a very slow frame rate is maybe a compressing protocol not needed to keep bandwidth reasonable narrow.
Check if amateur DTV formats or slow scan TV fits your need better, is it rather easy to find schematics at amateur homepages.
A bit different solution for transmitting digital video is this, as it can use an existing PC as only required hardware. It is a rather old example, with a modern PC/graphic card (x10 better performance) is it probably possible send several channels of live video.

 

[mf1364]

Digital video is a bit unspecified. Assume an existing MPEG file that you want to convert to a constant rate bit-stream, TS, and up-convert to a frequency suitable for transmitting. Is that what you want to do?
View attachment 88562
Should it also include a live stream such as from a camera and some kind of compressing format will it be a bit more complex. There is no such thing as a single chip solution, such as for a FM sound transmitter.
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thanks buddy but because storage of knowledge I can't follow your advice. I have searched a lot and find this both IC SN93330 & SN93331 as transmitter and receiver but I couldn't find a full datasheet. could you please say your idea about this IC and if you can find datasheet please share here

 

[E Kafeman]

Sorry, thought your idea was to send wireless digital video in a format that could be received with any, ordinary TV-set.
Even if you build something like SN93330 + transmittter nRF24L01 + cpu to controll these chips, is that a lot of work both with hardware design and it do also need programming.
If it is for personal use, why not reuse a circuits from an existing cheap IP-Cam. Costs less money and time.

 

[mf1364]

9this IC MRF24J40MA is a data transceiver and work in 2.4Ghz (ISM band ) so I want to know if I convert audio and video to data by using A2D, can I send Audio and video with this IC ? I think for Audio it is possible but for video I'am not sure what is your idea ?
how about this WVA5000 Chipset **broken link removed**?

 

[E Kafeman]

This chip have a SPI interface. Many cameras in for example cellphones have SPI interface. Add a SPI controller and a SPI compatible display at receiver end...