How to switch HDMI or CVBS video input via the UART AT command?
COFDM модулатор демодулатор модул енкодер декодер HDMI CVBS AV вход AES 256 FHD RF стрийминг
COFDM модулатор демодулатор модул енкодер декодер HDMI CVBS AV вход AES 256 FHD RF стрийминг
Съдържание
Another side view
COFDM Encoder module, CVBS / HDMI вход, IP output
For More details about the COFDM encoder board, please visit here
COFDM Encoder module Advantage:
- Ултра ниска латентност H.265/H.264 аудио и видео кодиране максимална поддръжка 1080P@60 заснемане и кодиране на видео в реално време
- HDMI или AV аудио и видео вход, след кодиране, изходния Ethernet порт или изход към безжичния модул, Скоростта на предаване на видео кодиране може да се конфигурира динамично
- Подкрепа аудио вход и аудио изход за декодиране
- Поддържа два видеоклипа (HDMI + AV) едновременно кодиране на входа (опция, по подразбиране е HDMI или AV кодиране, изберете един от два входни източника). )
- Web UI или сериен порт UART AT команда for configuration management
COFDM transmitter module
Изтегляне на лист с данни за модулатор-демодулатор COFDM
COFDM демодулатор Vcan1776RX-H264 лист с данни
The last version of the TX RX board
TX: V6.5.6p
RX: 4.1.2р
Често задавани въпроси
1. What should I do when I found one Tx module doesn't generate RF output power?
- Question1: Could you please tell me part number of this component, we try to find localy and check. Отговор 1: It is a inductance named LOH32PN2R2NNC.
- Suggest Check Points: If the power supply current of the board is well but there is no RF output, maybe the below component TC1-1-13MX+ is generally damaged.
- In order to avoid damage to this device during transportation (the device itself is relatively high), we ordered red glue protection for this device when we shipped it.
- The engineer also suggests that you check to see if the cable is loose or in poor contact.
- Please try to replace the FPC cable connecting the two boards
- We can provide spare parts if you're sure which one.
2. Can you offer me the UART AT command file for this model?
Сигурен
Моля, проверете връзката по-долу.
3. How does this COFDM Video transmitter and receiver support an IP camera?
1. It is not easy to connect to IPC for a one-way COFDM link. We have an H264 model, which is connected to IPC input by expanding the network port, but there are requirements for IPC models (not all models of IPC can be well connected with COFDM links), we have tested the IPCs of Hikvision, Dahua, and Xiongmai, and found that the connection effect of Hikvision is quite ideal.
2. It is impossible to directly remove the HDMI CVBS encoder and connect the IP Camera to the COFDM Transmitter board. One-way COFDM connection to IPC requires special technical methods to realize.
3. The best way is to recommend using our two-way image transmission transceiver, which directly supports the IP camera.
4. If the customer must use the COFDM transmitter board to support the IP camera, there are two points to pay attention to.
5. The first point is a technical problem. We need to use an alternative method to allow unidirectional COFDM links to be used with IPC.
6.If you consider IPC from the perspective of cost reduction, you don't need to consider it. Because the encoding board and decoding board are still necessary, the cost cannot be saved.
7. The second point is the customer's usage habit, which is no longer the traditional two-way link method. They can view the IP Camera Video and even control the PTZ of the IP Camera via the web page or PC-side PC software (UART AT команди).
8. Because of this model wireless link is a COFDM one-way link; there is no reverse data (only one-way transmission; data cannot be transmitted from the receiver to the transmitter); the customer can only watch the video of the IP Camera and cannot reversely configure the IP Camera's parameters or control the PTZ of the IPCamera.
9. This is a problem that many customers overlooked at first and later complained about after using it.
10. So we don't recommend that the client choose a one-way COFDM transmitter and receiver for the IP camera. We have a better solution for the IP Camera via two video link transceivers.
4. Could you please give me the Required C/N (BER=2x10-4 after Viterbi) for different the bandwidths 2, 4, 6, и 8 Mhz of HDMI video link we use?
cofdm video transmitter parameter configuare tool
1. В момента, the receiver only provides two parameters of signal strength and bit error rate, and there is no C/N parameter
2. What parameters do you need to adjust according to different bandwidths? If it is a video code stream, the transmitter encoding board itself will automatically calculate the appropriate video stream code rate according to the currently used wireless parameters (честотна лента, GI, CR, и т.н.), and the video code rate will be found after changing the bandwidth with the parameter board will automatically adapt.
3. въпрос, If our camera quality is good enough for both 4 MHz и 8 MHz честотна лента. В такъв случай, Should the customer choose 4 или MHz 8 MHz?
Отговор: Our one-way COFDM shipments use 4Mz wireless bandwidth by default, corresponding to a video bit rate of 3.12Mbps, which is enough for 1080p; If changed to 8MHz wireless bandwidth under the same conditions, the video bit rate doubles to 6.24Mbps. All customers can choose between wireless bandwidth 4MHz and 8MHz, even 6MHz can also be considered.
4. въпрос: Which is better for this tx+rx set from a receive sensitivity view?
Отговор: For wireless links, it can be simply considered that the receiving sensitivity will be higher at lower wireless bandwidths. From the perspective of receiving sensitivity, 4MHz>6MHz>8MHz
6. Do you have any COFDM Relay Repeater Modules for the Wireless Video Transmitter and Receiver？
COFDM реле ретранслатор за безжичен видео предавател и приемник
Сигурен
Моля, проверете връзката по-долу
COFDM Relay Repeater модул за дрон UAV безжичен видео предавател и приемник Vcan1870
7. Could send me a data measurement of sensitivity for 4/6/8 MHz cases? Например, for QPSK, 1/2CR, 1/32GI what threshold reception RX's input level (стока)?
Single channel receiving sensitivity:
-97+/-1DBM at QPSK 8MHz,
-98+/-1DBM at QPSK 6MHZ,
Sensitivity increased by 3dbm when receiving with dual antennas
9. Къде мога да изтегля UDP плейър? Препоръчваме Splayer_v4.2_2020.6.6, който използваме често.
The receiver default firmware supports RTSP player, some clients prefer UDP player, which we also can offer, then RTSP player doesn't support. （RTSP and UDP can only choose one of the two firmware）
Моля, изтеглете от връзката по-долу.
Splayer_v4.2_2020.6.6
https://drive.google.com/file/d/1ihzUhfnx2Wo3zLO8UAs1aUQeLswonJD-/view?usp=sharing
Splayer_v4.3_2022.10.22
https://drive.google.com/file/d/1PQc-LZ55qGnjeMsjkHYSloHfY3NEUsGH/view?usp=drive_link
10. Can you offer a metal box to protect the COFDM receiver board?
Сигурен, Моля, проверете по-долу картината.
How to upgrade the COFDM video receiver
How to upgrade the COFDM drone video encoder modulator board
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