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We want to take about :

We want to take about :. >> Introduction about project >> Block diagram . >> Microcontroller. >> Video Codec . >> Audio Codec . >> Wireless Audio and Video Transmission and – RF - TFT LCD Module & >> CMOS Camera >> What had been done? . >> What will be done?. Introduction.

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We want to take about :

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  1. We want to take about : >> Introduction about project>> Block diagram .>> Microcontroller.>> Video Codec . >> Audio Codec .>> Wireless Audio and Video Transmission and – RF -TFT LCD Module & >> CMOS Camera >> What had been done? .>> What will be done? .

  2. Introduction Multi-Channel Wireless Digital Video Intercom Device

  3. PIC18F4520 Perform simple control functions such as turning on and off the devices when the push buttons are Pressed

  4. ISM 2.4 GHz Frequency Band -Most widespread systems in the licensed-free 2.4 GHz -higher frequency bands can be partitioned into large number of channels as they have broader bandwidths. A bandwidth of at least 4-6 MHz must be assigned to obtain a reasonably clear picture

  5. XBee-Pro ZNet 2.5

  6. XBee-Pro ZNet 2.5 -RF modules only communicate when their IDs are matched. -The XBee-Pro ZNet 2.5 is able to perform automatic route discoveries -They can transmit up to 120m for indoors and 1 mile for outdoors.

  7. Video codec Encoder -High speed -Digital to analog video encoder -Has 8-bit video port to accept YCbCr422 video output

  8. Video codec Encoder

  9. Video codec decoder -Consume less power -Gives excellent quality -Include noise filter -Fix incorrect -frames(less BER) -It has interrupt pin

  10. Audio codec The audio codec used in the project is AD74111 from Analog Devices. This audio codec is particularly suitable for speech and telephony applications where mono input and output channels are required.

  11. Compression

  12. Compression >> predictive encoding . >> perceptual encoding .

  13. CMOS Camera &TFT LCD The camera used in the project is V100 . It is a 2-megapixel color camera module with digital output and uses the CMOS image sensor OV2640 from OmniVision .

  14. CMOS Camera &TFT LCD The TFT LCD module is used in the Receiver unit to display the video images of the caller.

  15. What had been done?? . We built the audio circuit but didn’t test it!

  16. Half circuit

  17. What will be done next? We'll build the next circuits &program the controller in caller unit and receiver

  18. thanks

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