COFDM 射频调制器和解调器固件比较

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; 保护间隔 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 射频调制器和解调器固件比较

Hardware modulator

COFDM Modulator Encoder Transmitter Module:

COFDM Demodulator Decoder Receiver Module:

H264

H265

参数配置板:

UART firmware command

Encoder Modulator Decoder Demodulator Module Parameter Configuration Instructions

Hardware and Firmware Compare

1. COFDM modulator encoder Transmitter Tx Module:

硬件	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.

固件	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)   一个. 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 + 关闭输入 (two videos)   Normal H.265 video compression for two video

2. COFDM demodulator decoder Rceiver Rx Module:

硬件	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. 乙. 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

硬件	Vcan1776RX-H265
Function	support HDMI + AV输出
Normal setting	Wireless parameter\bitrates\password\…\ setting via SconC or AT command
AES	AES256

固件	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;   一个. 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	一个	×
Normal H.264	F1 -B	乙	F1-A
Normal H.265	F1-C	×	F1-B
Two videos H.265	F2	×	F2

Price Compare

模块型号	单价	数量	全部的
Vcan1776TX	$680	21	$1360
Vcan1776RX-H264	$350	1	$350
Vcan1776RX-H265	$350	1	$350
参数配置板	$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 射频调制器和解调器固件比较

COFDM demodulator datasheet

问题: Do you have the dimensions of the shielding cover for the RF module?

回答:

常问问题

Q1: Please provide the following technical information:

I’m currently evaluating the parameters of your COFDM modulator. For a better understanding of your device, please provide the following technical information:

1. 快速傅里叶变换大小
2. Number of active subcarriers used for data transmission
3. Occupied bandwidth or actual spectral bandwidth at 90% OBW
4. 平均PAPR (peak-to-average power ratio)

A1: Please check the reply from our engineer.

1. 快速傅里叶变换大小: 2047
2. Number of active subcarriers used for data transmission: 1705 active subcarrier(inclue pilot)
3. Occupied bandwidth or actual spectral bandwidth at 90% OBW: 7.6Mhz in 8Mhz Channel.
4. 平均PAPR (peak-to-average power ratio): ~10.7db

Q: Does your COFDM video transmitter support dual video input simultaneous encoding and transmission?

是. Our COFDM transmitter supports simultaneous encoding and transmission of two video inputs at the same time.

The supported dual-input combinations are:

• HDMI + CVBS
• SDI + CVBS

Both video channels can be encoded and transmitted simultaneously through one transmitter system.

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Q: What receiver options are available for dual video transmission?

We currently offer two receiver options for dual-channel video applications:

Receiver Option 1 – Dual Video Picture-in-Picture (画中画) 展示

特征:

• Supports simultaneous decoding and display of two video channels
• 支持 画中画 (画中画) viewing mode
• Video outputs:
  • HDMI输出
  • CVBS输出
• Designed for connection to standard monitors/displays

局限性:

• 做 不是 support network video streaming output
• No RTSP or UDP streaming via Ethernet
• Cannot output video streams directly to a computer over LAN

Recommended for:

Users who need to monitor two video channels simultaneously on a display screen.

Receiver Option 2 – Network Streaming Receiver

特征:

• Supports Ethernet video streaming output
• 支持:
  • RTSP 流媒体
  • UDP 流式传输
• Can output video streams directly to a computer via network cable
• Includes a physical button to switch between Channel 1 and Channel 2 视频流

局限性:

• 做 不是 support simultaneous dual-channel PIP display
• Only one video channel can be viewed/output at a time

Recommended for:

Users who require IP streaming, computer integration, or software decoding/recording.

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Q: Which receiver should I choose?

• If you need to view both video channels simultaneously on a monitor, 我们推荐 Receiver Option 1 (PIP Receiver).
• If you need RTSP/UDP network streaming to a PC or software platform, 我们推荐 Receiver Option 2 (Network Streaming Receiver).

Please let us know which receiver solution you prefer, and we will recommend the most suitable configuration for your project.