COFDM受信機のOSD表示機能

キー1: OSD表示のステータスをオン/オフします。, 長押しすると切り替わります(more than 1s). the status will be kept after reboot. When the OSD status is on without any OSD data input from the data uart, the device will display information on the video screen as:

RF：338.0MHz帯域幅：4.0メガヘルツ; RF, 動作周波数; BW, 帯域幅

QPSK CR：2/3  GI:1/16; 星座, FEC, Guard interval.

空気：3.90Mbps; 空気, wireless transmitting bitrates   

VBR：3.05Mbps AES OFF; VBR, video bitrates; AES OFF, AES encryption turned off.

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; video recording status

What is VBR? VBR は、送信機でのビデオ エンコード ビット レートです。. 映像がダイナミックに変化するため、, VBRはもちろん可変, ただし、伝送システムによって設定されたエンコード ビット レートを中心に変動します。: 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), $(×),$(y),$(str) _example：ATOSD1,40,20,height: 100m_
パラメータ	font:  0:  8×16, ピクセル;  1:  16×24, ピクセル; ×:   0 に 1919, horizontal axis; Y: 0 に 1079, vertical axis; Str:   characters string start to show on the HDMI screen from (×,y) ポイント; space characters used for a clean screen at that point. Since ’_’ is the command end flag, No ’_’ can be used in these parameters.
関数	To display the characters string on the HDMI screen with the video in OSD mode
return	Null
description	1) This command is used for the customer’s MCU module to our Receiver via data UART; 2) 使用できます ATST command(described in other documents) to define our Receiver UART;  3) You should draw the HDMI screen following 1920*1080 pixels via (×,y) 軸. Our receiver firmware will adjust it automatically according to the real screen systems.