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Wireless Video Transmission
COFDM RF Modulator and Demodulator firmware compare
COFDM RF Modulator and demodulator module demand:
- Modulation module supporting h.264 and h.265 encoding,
- Demodulator module supporting h.264 and h.265 decoding,
- Tx+RX firmware option: Proprietary H.264 video compression uses only p-frames for the lowest latency
- Tх+Rx firmware option: HDMI+AV interface video input, two-way video compression transmission
- AES-256 encryption/decryption for HDMI and CVBS input
- Full control over COFDM parameters, bandwidth configurable from 1MHz to 8MHz in 1KHz steps; FEC 1/2, 2/3, 3/4, 5/6, 7/8; Guard interval 1/32, 1/16, 1/8, 1/4; constellation QPSK, 16QAM, 64QAM; bit rate 0.5Mbps to 31.67Mbps
- RTCP and UDP protocols for Rx video output
COFDM RF Modulator and Demodulator firmware compare
Hardware modulator
COFDM Modulator Encoder Transmitter Module:
COFDM Demodulator Decoder Receiver Module:
H264
H265
Parameter Configuration Board:
UART firmware command
Encoder Modulator Decoder Demodulator Module Parameter Configuration Instructions
Hardware and Firmware Compare
1. COFDM modulator encoder Transmitter Tx Module:
| Hardware | Vcan1776TX |
| Normal setting | Wireless parameter\bitrates\password\…\ setting via SconC or AT command |
| AES | AES256 |
| About bitrates | COFDM wireless link itself supports 0.5Mbps to 31.67Mbps But to ensure good video quality and the wireless transmitting distance, the video encoding bitrates are limited to less than 15Mbps. |
| Firmware | F1 (USB disk to do: F2 update to F1) | F2 (USB disk to do: F1 update to F2) |
| Function | Only support HDMI or AV input(one video) A. Proprietary H.264 video compression only used p-frames for lowest latency B. Normal H.264 video compression C. Normal H.265 video compression AT command to switch between A/B/C | support HDMI + AV input (two videos) Normal H.265 video compression for two video |
2. COFDM demodulator decoder Rceiver Rx Module:
| Hardware | Vcan1776RX-H264 |
| Function | support HDMI + AV output Built-in RTSP server enables video streaming out over Ethernet A. Proprietary H.264 video decompression only used p-frames for lowest latency. B. Normal H.264 video decompression AT command to switch between A/B |
| Normal setting | Wireless parameter\password\…\ setting via SconC or AT command |
| AES | AES256 |
| Hardware | Vcan1776RX-H265 |
| Function | support HDMI + AV output |
| Normal setting | Wireless parameter\bitrates\password\…\ setting via SconC or AT command |
| AES | AES256 |
| Firmware | F1 (TF card to do: F2 update to F1) | F2 (TF card to do: F1 update to F2) |
| Function | Built-in RTSP server enables video streaming out over Ethernet; A. Normal H.264 video decompression B. Normal H.265 video decompression AT command to switch between A/B | Normal H.265 video decompression for two videos Do not support built-in RTSP server |
COFDM Tx and Rx paired table:
| Firmware and function | Vcan1776TX | Vcan1776RX-H264 | Vcan1776RX-H265 |
| H.264 low latency | F1 -A | A | × |
| Normal H.264 | F1 -B | B | F1-A |
| Normal H.265 | F1-C | × | F1-B |
| Two videos H.265 | F2 | × | F2 |
Price Compare
| Module Model | Unit Price | Quantity | Total |
| Vcan1776TX | $680 | 21 | $1360 |
| Vcan1776RX-H264 | $350 | 1 | $350 |
| Vcan1776RX-H265 | $350 | 1 | $350 |
| Parameter Configuration Board | $40 | 2 | $80 |
For the modulator encoder transmitter TX module, Please consider buying 2 sets of Vcan1776TX, one for F1 firmware and one for F2 firmware, for easy test comparison.
For the demodulator decoder Receiver RX module, please consider buying one H264 and one H265 to compare.
COFDM RF Modulator and Demodulator firmware compare