Broadcast Microwave Services Inc CCII-9L Manual De Usuario

 

6051412900 Rev - 

 

17

 
The CARRY-CODER II has two modes of operation.  

1.  The NORMAL mode provides the operator with control of system functions that are needed in routine portable camera 

situations.  Section 3 of this manual describes these functions, including three factory preset configurations. 

2.  The EXPERT mode enables the operator to selectively adjust key (audio and video) compression and COFDM 

transmission parameters. 

 

 

The EXPERT mode should be used carefully because specific parameter settings are required to ensure proper 
operation of the system. This mode should be reserved to advanced users. 

 
The expert mode is activated through the following menu: 
 

USER MODE 
normal  expert

 

 
The Expert Mode gives access to the expert audio-video and COFDM parameters that are described in the next sections. 
 
 
 

 
Recommendations 
 
The video quality mainly depends upon the allocated video bit rate and is closely linked to picture resolution and Group Of Picture 
(GOP) structure. 
 
The following table describes recommendations for realistic combinations for video encoding parameters. 
 

2-3 Mb/s 

IBBP 

Poor 

Approximately 260 ms. 

3-5 Mb/s 

IBBP 

Medium 

Approximately 260 ms. 

5-8 Mb/s 

IBBP 

High 

Approximately 260 ms. 

8-11 Mb/s 

IP 

High 

Approximately 130 ms. 

11-15 Mb/s 

I  

Maximum 

Approximately 80 ms. 

 
Other combinations can be derived by the operator using the expert video parameters that are described below: 
 

 

If the video bit rate selected exceeds the current available bit rate, the CCII will automatically scaled down the bit rate. 

 
 
Video Bitrate 
  

Video bitrate 
4.35 Mbps 

 
This parameter controls digital picture resolution (pixels per line) used for MPEG-2 encoding. A high MPEG-2 encoding Bit rate 
provides greater resolution for the best video quality.  A low MPEG-2 encoding Bit rate provides lower resolution, reducing the 
quality of the picture.   Decreasing the resolution setting is useful for a low encoding Bit rate in order to reduce Pixelization when 
dealing with highly detailed fast moving scenes.