Fungsi paparan OSD pada penerima COFDM

key1: turn on/off the status of the OSD displaying, tekan lama untuk beralih(lebih daripada 1s). the status will be kept after reboot. Apabila status OSD dihidupkan tanpa sebarang input data OSD daripada uart data, peranti akan memaparkan maklumat pada skrin video sebagai:

RF：338.0MHz BW：4.0MHz; RF, kekerapan kerja; BW, bandwidth

QPSK CR：2/3 GI:1/16; Constellation, FEC, selang Guard.

AIR：3.90Mbps; AIR, kadar bit penghantaran wayarles

VBR：3.05Mbps AES OFF; VBR, kadar bit video; AES OFF, Penyulitan AES dimatikan.

SIG1：27 SIG2：22; SIG1, signal intensity of ant 1; SIG2, signal intensity of ant 2

ber1:0.14% ber2:100.00%; ber1, bit error rate of ant 1; ber2, bit error rate of ant 2

REC OFF No Storage; status rakaman video

What is VBR? VBR ialah kadar bit pengekodan video pada pemancar. Memandangkan gambar video berubah secara dinamik, VBR sudah tentu berubah-ubah, tetapi ia turun naik di sekitar kadar bit pengekodan yang ditetapkan oleh sistem penghantaran: 7.81*0.8=6.248Mbps

How to use OSD API in Our COFDM systems?

Steps description:

1) The customer’s module sends the digital data to our COFDM transmitter via UART;

2) Our transmitter will send the digital data with video data together to our COFDM receiver via the wireless link;

3) Our receiver will send out the digital data to the customer’s module via UART;

4) The customer’s module should transfer the digital data into the characters string they want to show on the video screen in OSD mode. Then the customer’s module sends the characters string to our receiver via the same UART.

5) Our receiver will display the character’s string on the HDMI display screen with the video together in OSD mode.

API of Our COFDM receiver:

command	ATOSD$(font), $(x),$(dan),$(str) _example：ATOSD1,40,20,height: 100m_
parameters	font: 0: 8×16, piksel; 1: 16×24, piksel; x: 0 kepada 1919, horizontal axis; dan: 0 kepada 1079, vertical axis; Str: characters string start to show on the HDMI screen from (x,dan) point; space characters used for a clean screen at that point. Since ’_’ is the command end flag, No ’_’ can be used in these parameters.
fungsi	To display the characters string on the HDMI screen with the video in OSD mode
return	Null
penerangan	1) This command is used for the customer’s MCU module to our Receiver via data UART; 2) You can use ATST command(described in other documents) to define our Receiver UART; 3) You should draw the HDMI screen following 1920*1080 pixels via (x,dan) axis. Our receiver firmware will adjust it automatically according to the real screen systems.