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HDMI Adapter box for " usb uvc webcam video source to HDMI output "





   This box  can let uvc usb webcam become hdmi output

"UVC webcam to hdmi" have many detail technical problem to be solve

1. UVC Webcam video stream

   UVC webcam have  YUV  and MJPG  stream

   YUV means no compression . MJPG menas compression stream.

   YUV  video frame rate will be slower than MJPG video frame rate.

   Each YUV and each MJPG also have difference resolution.


   if you catch 640X 480 resolution, the resolution is bad.


   The best uvc stream that be caught  is  MJPG  1280X720.

    The reason is as below

     reason 1: the frame rate can be 30fps

     reason 2 : the video resolution is HD. video performance is better.

          if you caugh 1920x1080 uvc, the frame rate will be reduce.



2. HDMI output is  1920X1080P

    After getting the uvc stream,  it will be convert to 1920x1080p hdmi output.

        We can not fixed the uvc resoution and uvc format and uvc frame rate.

   so, it must have the ability that can let all of kind of uvc resolution  become  1920x1080p  full HD hdmi output.


   

How to solve the noise "Bi Bi Bi " of Grabber card in WINDOWS / MAC


The UAC audio "Bi Bi Bi...." is due to the sampling rate.




The sample rate of audio from the HDMI machine are  44.1khz  / 48khz.

The audio sample rate in the PC ( windows / MAC ) must equal the audio  sample rate of HDMI


For eample:


if audio  sample rate of hdmi is  44.1Khz and UAC audio  44.1Khz in the PC, the audio will be normal


if audio  sample rate of hdmi is  48Khz and UAC audio 48Khz in the PC, the audio will be normal


If audio sample rate of hdmi is  44.1Khz and UAC audio  48Khz in the PC, the audio will happen "Bi Bi" noise.


If audio sample rate of hdmi is  48Khz and UAC audio  44.1Khz in the PC, the audio will happen "Bi Bi" noise.


How to Change audio sampling rate in WINDOWS?

step 1: audio setting

 step2:  find out the  USB audio device ( HD TV CAM)

 


step3:  advance setting










How to change audio sampling rate in MAC OSX?

search ap "midi"




you can select 44.1khz or 48khz





Video demo



SR1913 :全世界最小的 CVBS output (tv out) video encoder 用在內視鏡 內窺鏡 工業蛇管 ,取代三洋 SANYO LC822973-04V-TBM-GBE



如果您是做內視鏡 蛇管的廠商,
應該都有聽過  三洋  SANYO LC822973-04V-TBM-GBE

這顆會這麼有名,是因為他的寬度只有4mm
如果拿去做直徑5.5mm大小的內視鏡,是足夠的!



但是很可惜,三洋 SANYO LC822973-04V-TBM-GBE
 早在2008 年就停產, 現在廠商使用的大多是用他的庫存貨


除了DATE CODE  太久 ,那也就算了,

這顆ic 的庫存也快要沒有了...


SR1913 :全世界最小的 CVBS output (tv out)  video encoder 用在內視鏡 內窺鏡 工業蛇管 ,取代三洋  SANYO LC822973-04V-TBM-GBE



目前市面上的 TV OUT encoder 一籮筐,

但是他們的設計只主要是針對於消費性的市場,

沒有人為了工業檢測或是安全監控 市場專門開一顆像樣的IC



這顆ic主要是針對於,工業檢測攝影機 ( endoscope / snake camera ), 直徑5.5mm 的dimension以下的攝影機



↓目前這類的攝影機,鏡頭的直徑大多是在 5.5mm 以上, 主要卡在tv out encoder 的體積限制!







SR1913 他的體積大小只有 3.6mm ,

這樣做出來的攝影機,理論上可以到4.6mm 的直徑寬度









除此之外,還有 Frame buffer,

不管前面CMOS sensor吐出 幾張畫面   N  介於  1~30 , 都可以順利轉成CVBS

如果在低召度時候,可以控制sensor 吐出比較低的 frame rate,

如此,曝光度就會拉高!





  


SR1913 可以吃1M  的ITU.656 的訊號進來,

由於解析度夠高,但是輸出的CVBS 大概就是720x480,

可以利用這一點做到e PTZ  不會有馬賽克的!




還有一些奇奇怪怪功能, 比如魚眼修正,OSD, keystone 修正, muti widnows,






   





ic 的系統架構圖








目前業界主要是用 SANYO LC822973 這一顆tv out encoder 去做 endoscope snake camera

但是SANYO LC82973 早在2008 八月已經停產

使用的ic 都是庫存貨,date code超過五年了!!!!



以下這張tabel, 是這兩款ic的比較圖


Model

SANYO LC822973

(2008 八月停產)

SR1913

Process

0.165

0.11

operation temperature

-30~85 degree
 
-45~85 degree

(工業規格以上)

Power consumption

180mW

~120mW (VGA)

~160mW (1.3M)

Just only video convert

BGA pin

63

72

BGA size

4mm x5mm

3.6mm x 7mm

Video inputn resolution

(YUV 422 progressive)

640X480

1280X720@30FPS

1.3M @ 25fps

Output

CVBS

CVBS or BT.656

ROI

Any digital zoom

Digital Algorithm

Fisheye correction

Keystone

OSD/line drawing

PIP up to 3 sub-windows

8 private mask



EVB board 即將要完成!